CN112688748B - Audio transmission system and method - Google Patents
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Abstract
The invention discloses an audio transmission system and method. In the audio transmission system, an antenna feeder subsystem is used for transmitting a plurality of paths of radio frequency source signals carrying target audio data to a plurality of paths of signal receiving subsystems; the multi-channel radio frequency source signals are demodulated by the multi-channel signal receiving subsystem to obtain multi-channel audio source signals which are transmitted to the information source processing subsystem, and the multi-channel audio source signals are transmitted to the monitoring and switching subsystem after being processed by the information source processing subsystem; the monitoring and switching subsystem is used for transmitting the main road audio source signal serving as a target audio source signal to the transmitting subsystem; and transmitting the secondary audio source signal as a target audio source signal to the transmitting subsystem when the switching condition is met; at least one path of radio frequency signals obtained after the target audio source signals are modulated by the transmitting subsystem are transmitted to the antenna feeder subsystem; the antenna feed subsystem is used for transmitting at least one path of radio frequency signal to play target audio data. The embodiment of the invention improves the reliability of transmitting the audio data.
Description
Technical Field
The embodiment of the invention relates to the technical field of audio, in particular to an audio transmission system and an audio transmission method.
Background
For audio data (such as hearing content) needing to be played uniformly in a certain jurisdiction, the audio data can be played in a wired broadcast mode and a wireless broadcast mode.
In the related art, the process of playing in a cable broadcast manner includes: playing an audio carrier (such as a tape) storing audio data by adopting a cable broadcasting system; or the network equipment decodes the audio stream after acquiring the audio stream to obtain an audio signal carrying audio data, and then plays the audio data; or directly playing the audio data through the FM broadcast transmitting equipment. The process of playing in a wireless broadcast mode comprises the following steps: and uniformly playing audio data in a certain jurisdiction by using public frequency modulation broadcast of a transmission and transmission center of a broadcast station.
However, in the process of playing in a wired broadcast manner, an audio carrier, a network device or a fm broadcast transmitting device may break down suddenly, which results in poor quality of audio data playing or interruption of audio data playing; in the process of playing in a wireless broadcast mode, a building which hinders propagation of signals transmitted by public FM broadcast may be newly built in a certain jurisdiction, and transmitted signals received by some places in the jurisdiction are weak or cannot be received, so that the quality of audio data played by some places in the jurisdiction is poor or the playing of the audio data is interrupted, and therefore, the reliability of transmitting the audio data in the related technology is poor.
Disclosure of Invention
The invention provides an audio transmission system and method, which are used for improving the reliability of transmitting audio data (such as listening test contents).
In a first aspect, an embodiment of the present invention provides an audio transmission system, including:
the system comprises an antenna feed subsystem, a multi-channel signal receiving subsystem, an information source processing subsystem, a monitoring and switching subsystem, a transmitting subsystem and a power supply subsystem;
the antenna feeder subsystem is used for receiving a plurality of paths of radio frequency source signals and transmitting the plurality of paths of radio frequency source signals to the plurality of paths of signal receiving subsystems, and each path of radio frequency source signal carries target audio data;
the multi-channel signal receiving subsystem is used for demodulating the received multi-channel radio frequency source signals to obtain multi-channel audio source signals and transmitting the multi-channel audio source signals to the information source processing subsystem;
the signal source processing subsystem is used for processing the received multi-channel audio source signals and transmitting the processed multi-channel audio source signals to the monitoring and switching subsystem;
the monitoring and switching subsystem is used for transmitting a main audio source signal in the received multi-channel audio source signals to the transmitting subsystem as a target audio source signal; the transmitting subsystem is further configured to transmit a secondary audio source signal of the received multiple audio source signals to the transmitting subsystem as the target audio source signal when a switching condition is satisfied, where the secondary audio source signal is different from the primary audio source signal;
the transmitting subsystem is used for modulating the received target audio source signal to obtain at least one path of radio frequency signal and transmitting the at least one path of radio frequency signal to the antenna feed subsystem;
the antenna feeder subsystem is also used for transmitting the at least one path of radio frequency signal so as to play the target audio data;
and the power supply subsystem is used for supplying power to each subsystem in the audio transmission system.
Optionally, the antenna feed subsystem includes a plurality of distributed receiving antennas and at least one distributed transmitting antenna, where each distributed receiving antenna is configured to receive one path of the radio frequency source signal, and each distributed transmitting antenna is configured to transmit one path of the radio frequency signal.
Optionally, the at least one distributed transmit antenna comprises an isolated dual antenna.
Optionally, the monitoring and switching subsystem includes: the audio transformer, the audio source selection switching module and the display module are arranged in the audio system;
the audio transformer is used for distributing each path of audio source signals into m paths of audio source signals and respectively transmitting two paths of audio source signals in the m paths of audio source signals to the audio source selection switching module and the display module, wherein m is more than or equal to 2;
the audio source selection switching module is configured to transmit the received main audio source signal as the target audio source signal to the transmitting subsystem; and transmitting the secondary audio source signal to the transmitting subsystem as the target audio source signal when a switching condition is satisfied;
the display module is used for displaying the input audio source signal.
Optionally, the monitoring and switching subsystem further comprises: a monitoring module;
the antenna feed subsystem is also used for transmitting the at least one path of radio frequency signal to the multi-path signal receiving subsystem;
the multi-channel signal receiving subsystem is further configured to demodulate the at least one channel of radio frequency signal to obtain at least one channel of audio signal, and transmit the at least one channel of audio signal to the information source processing subsystem;
the signal source processing subsystem is further configured to perform signal processing on the received at least one path of audio signal, and transmit the processed at least one path of audio signal to the audio transformer;
the audio transformer is used for distributing each path of audio signal into n paths of audio signals and respectively transmitting two paths of audio signals in the n paths of audio signals to the monitoring module and the display module, wherein n is more than or equal to 2;
the monitoring module is used for selecting any audio signal from the received audio signals to play;
the display module is also used for displaying the input audio signal.
Optionally, the transmitting subsystem comprises a signal receiver and at least one frequency modulation transmitter;
the signal receiver is used for providing an external signal to the frequency modulation transmitter;
and the frequency modulation transmitters are used for modulating the received target audio source signals by using the external signals, and each frequency modulation transmitter is used for transmitting one path of radio frequency signals to the antenna feeder subsystem.
Optionally, the number of the fm transmitters is plural, and any two fm transmitters have the same model.
Optionally, the signal processing comprises: at least one of a delay adjustment, a level adjustment, and a frequency response adjustment.
Optionally, the switching condition includes: the received audio source signals are absent at least one of the main audio source signal and the main audio source signal having a volume less than a volume threshold.
Optionally, the monitoring and switching subsystem comprises an audio transformer;
the audio transformer is used for carrying out unbalanced-to-balanced conversion on each path of the received audio source signals.
In a second aspect, an embodiment of the present invention provides an audio transmission method, which is applied to an audio transmission system, where the audio transmission system includes: the system comprises an antenna feed subsystem, a multi-channel signal receiving subsystem, an information source processing subsystem, a monitoring and switching subsystem, a transmitting subsystem and a power supply subsystem; the method comprises the following steps:
the power supply subsystem supplies power to each subsystem in the audio transmission system;
the antenna feeder subsystem receives a plurality of paths of radio frequency source signals and transmits the plurality of paths of radio frequency source signals to the plurality of paths of signal receiving subsystems, and each path of radio frequency source signal carries target audio data;
the multi-channel signal receiving subsystem demodulates the received multi-channel radio frequency source signals to obtain multi-channel audio source signals, and transmits the multi-channel audio source signals to the information source processing subsystem;
the information source processing subsystem carries out signal processing on the received multi-channel audio source signals and transmits the processed multi-channel audio source signals to the monitoring and switching subsystem;
the monitoring and switching subsystem transmits a main audio source signal in the received multi-path audio source signals to the transmitting subsystem as a target audio source signal;
the transmitting subsystem modulates the received target audio source signal to obtain at least one path of radio frequency signal and transmits the at least one path of radio frequency signal to the antenna feeder subsystem;
the antenna feed subsystem transmits the at least one path of radio frequency signal to play the target audio data;
and when the monitoring and switching subsystem meets the switching condition, transmitting a secondary audio source signal in the received multi-channel audio source signals to the transmitting subsystem as the target audio source signal, wherein the secondary audio source signal is different from the main audio source signal.
Optionally, the antenna feed subsystem includes a plurality of distributed receiving antennas and at least one distributed transmitting antenna, where each distributed receiving antenna is configured to receive one path of the radio frequency source signal, and each distributed transmitting antenna is configured to transmit one path of the radio frequency signal.
Optionally, the at least one distributed transmit antenna comprises an isolated dual antenna.
Optionally, the monitoring and switching subsystem includes: the audio transformer, the audio source selection switching module and the display module;
the audio transformer is used for distributing each path of audio source signals into m paths of audio source signals and respectively transmitting two paths of audio source signals in the m paths of audio source signals to the audio source selection switching module and the display module, wherein m is more than or equal to 2;
the audio source selection switching module is used for transmitting the received main road audio source signal as the target audio source signal to the transmitting subsystem; and transmitting the secondary audio source signal to the transmitting subsystem as the target audio source signal when a switching condition is satisfied;
the display module is used for displaying the input audio source signal.
Optionally, the monitoring and switching subsystem further comprises: a monitoring module;
the antenna feeder subsystem is also used for transmitting the at least one path of radio frequency signal to the multi-path signal receiving subsystem;
the multi-channel signal receiving subsystem is further configured to demodulate the at least one channel of radio frequency signal to obtain at least one channel of audio signal, and transmit the at least one channel of audio signal to the information source processing subsystem;
the signal source processing subsystem is further configured to perform signal processing on the received at least one path of audio signal, and transmit the processed at least one path of audio signal to the audio transformer;
the audio transformer is used for distributing each path of audio signal into n paths of audio signals and respectively transmitting two paths of audio signals in the n paths of audio signals to the monitoring module and the display module, wherein n is more than or equal to 2;
the monitoring module is used for selecting any audio signal from the received audio signals to play;
the display module is also used for displaying the input audio signal.
Optionally, the transmitting subsystem comprises a signal receiver and at least one frequency modulated transmitter;
the signal receiver is used for providing an external signal to the frequency modulation transmitter;
and the frequency modulation transmitters are used for modulating the received target audio source signals by using the external signals, and each frequency modulation transmitter is used for transmitting one path of radio frequency signals to the antenna feeder subsystem.
Optionally, the number of the fm transmitters is plural, and any two fm transmitters have the same model.
Optionally, the signal processing comprises: at least one of a delay adjustment, a level adjustment, and a frequency response adjustment.
Optionally, the handover condition includes: the audio source signal is absent from the received audio source signals and the main audio source signal has a volume less than at least one of a volume threshold.
Optionally, the monitoring and switching subsystem comprises an audio transformer;
the audio transformer is used for carrying out unbalanced-to-balanced conversion on each path of the received audio source signals.
In the embodiment of the invention, the multi-channel signal receiving subsystem is used for demodulating multi-channel radio frequency source signals transmitted by the antenna feed subsystem and transmitting the multi-channel audio source signals obtained after demodulation to the information source processing subsystem; the signal source processing subsystem is used for carrying out signal processing on the multi-channel audio source signals and then transmitting the multi-channel audio source signals to the monitoring and switching subsystem; the monitoring and switching subsystem is used for transmitting a main audio source signal in the multi-channel audio source signals to the transmitting subsystem as a target audio source signal and is also used for transmitting a secondary audio source signal which is different from the main audio source signal in the multi-channel audio source signals to the transmitting subsystem as the target audio source signal when the switching condition is met; the transmitting subsystem is used for modulating a target audio source signal and transmitting at least one path of radio frequency signal obtained after modulation to the antenna feeder subsystem; the antenna feed subsystem is also used for transmitting at least one path of radio frequency signal so as to play the target audio data. The audio transmission system can acquire the multi-channel audio source signals, and the signal source processing subsystem carries out signal processing on the multi-channel audio source signals, so that the quality of the audio source signals is improved. The monitoring and switching subsystem switches the target audio source signals when meeting the switching condition, so that when a main audio source signal fails, other secondary audio source signals can be transmitted to the subsequent transmitting subsystem to play the target audio data, the problem of poor reliability in audio data transmission in the related art is solved, and the reliability in transmission of audio data (such as hearing test contents) is improved.
When the audio transmission system is applied to a hearing test scene, when one path of audio source signal fails, other paths of audio source signals can be switched to in time to ensure normal playing of hearing test contents, so that normal running of the test process is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an audio transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another audio transmission system according to an embodiment of the present invention;
fig. 3 is a flowchart of an audio transmission method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
For audio data which needs to be played in a united manner in a certain jurisdiction, two modes of wired broadcasting and wireless broadcasting can be adopted. The audio data may include hearing content, news content, meeting content, and temporary notifications, among others. Illustratively, the hearing content may include hearing test content, such as middle and high test english hearing test content, and the like.
In the related art, the process of playing in the cable broadcast mode may include the following steps: an audio carrier storing audio data (e.g., hearing test contents) is played by using a cable broadcasting system (e.g., an in-school cable broadcasting system), and the audio carrier may include: compact Disc (CD), moving Picture Experts Group Audio Layer III (MP 3) player or tape; or acquiring an audio stream through network equipment (for example, acquiring a hearing test audio stream sent by an examination room website through internet multicast), decoding the audio stream to obtain an analog audio signal comprising audio data, and then playing the audio data; or over-the-air via a fm broadcast transmitter (e.g., a campus fm broadcast transmitter) to play audio data.
However, in the process of playing in the wired broadcasting mode, the audio carrier, the network device or the fm broadcast transmitting device may suddenly fail, resulting in poor quality of audio data playing or interruption of audio data playing. In the hearing test process, the playing quality of the hearing content is poor or the playing is interrupted, which can cause great influence on the test process.
The process of playing in a wireless broadcast mode comprises the following steps: and uniformly playing audio data in a certain jurisdiction by using public frequency modulation broadcast of a transmission and transmission center of a broadcast station. For example, public FM broadcast of a transmission transmitting center of a city broadcast television station is utilized to uniformly play the hearing test contents in the examination room.
However, in the process of playing in a wireless broadcast mode, a building which hinders propagation of signals transmitted by public fm broadcasts may be newly built in a certain jurisdiction, and transmitted signals received by some places in the jurisdiction are weak or cannot be received, so that the quality of audio data played by some places is poor or the playing of the audio data is interrupted. For example, a building built around an examination room blocks a transmission signal of public fm broadcast, so that the transmission signal cannot achieve good coverage on the examination room, and further, the transmission signal received by a part of the examination room is weak or cannot be received, thereby affecting the examination process.
In summary, the reliability of transmitting audio data (e.g., hearing test contents) in the related art is poor.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an audio transmission system according to an embodiment of the present invention, where the audio transmission system 10 includes:
an antenna feeder subsystem 101, a multipath signal receiving subsystem 102, a source processing subsystem 103, a monitoring and switching subsystem 104, a transmitting subsystem 105 and a power supply subsystem 106.
The antenna feed subsystem 101 is configured to receive multiple radio frequency source signals, and transmit the multiple radio frequency source signals to the multiple signal receiving subsystem 102, where each radio frequency source signal carries target audio data. The target audio data may include hearing content, such as hearing test content. The hearing test content may include: the hearing test contents of the middle school entrance examination, the hearing test contents of the college entrance examination and the like, which are not limited in the embodiment of the present invention.
The antenna feed subsystem 101 may receive multiple rf source signals from at least one of the following: a local transmitting station's transmitting center and a fm broadcast transmitting center. The multi-channel radio frequency source signal comprises: at least one of a digital television signal of a terrestrial digital television band, a frequency modulation broadcast signal, and a cable television signal.
The multi-channel signal receiving subsystem 102 is configured to demodulate received multi-channel rf source signals to obtain multi-channel audio source signals, and synchronously transmit the multi-channel audio source signals to the source processing subsystem 103. The audio source signal has poor capability of exciting electromagnetic waves in space, and can be transmitted to the air only by being loaded on the radio frequency source signal with better transmission capability, so that the audio source signal is obtained by demodulating the radio frequency source signal after the multi-channel signal receiving subsystem receives the radio frequency source signal loaded with the audio source signal. The multiple signal receiving subsystem 102 has signal receiving paths corresponding to the type of the rf source signal. By way of example, assume that the multiple rf source signals include: digital television signals, frequency modulated broadcast signals, and cable television signals; accordingly, the multiple reception subsystem 102 includes: the system comprises a digital television signal receiving module, a frequency modulation broadcast signal receiving module and a cable television signal receiving module.
The source processing subsystem 103 is configured to perform signal processing on the received multiple audio source signals, and transmit the processed multiple audio source signals to the monitoring and switching subsystem 104. The signal processing may include at least one of delay adjustment, level adjustment, and frequency response adjustment. Because the receiving sources of the radio frequency sources of all paths are different, the time delays of the audio sources of all paths are possibly inconsistent, and the time delays of the audio sources of multiple paths can be adjusted to be consistent through time delay adjustment. The quality of each path of audio source signal can be improved through level adjustment and frequency response adjustment.
The monitoring and switching subsystem 104 is configured to transmit a main audio source signal of the received multiple audio source signals to the transmitting subsystem 105 as a target audio source signal; and is further configured to transmit a secondary audio source signal of the received multiple audio source signals, which is different from the primary audio source signal, to the transmit subsystem 105 as a target audio source signal when the switching condition is satisfied. The main audio source signal in the multiple audio source signals is preset by the technician, and may be one audio source signal with better and stable quality selected by the technician based on experience.
The transmitting subsystem 105 is configured to modulate the received target audio source signal to obtain at least one rf signal, and transmit the at least one rf signal to the antenna feeder subsystem 101. The transmit subsystem 105 may perform national standard fm broadcast modulation and power amplification on the target audio source signal to enable the resulting rf signal to be transmitted in the national standard fm band. The antenna feeder subsystem 101 is further configured to transmit at least one radio frequency signal to play the target audio data.
The power supply subsystem 106 is used to supply power to the various subsystems in the audio transmission system 10. Which may be connected to the various subsystems through a power distributor to power active loads in the various subsystems in audio transmission system 10. Optionally, the Power subsystem 106 may include an Uninterruptible Power Supply (UPS), which may employ a Power input of an ac three-phase Power source. It should be noted that the audio source system also includes some environmental devices for ventilation and heat dissipation, and the power supply subsystem 106 may not supply power to such environmental devices.
The audio transmission system provided by the embodiment of the invention can be used for transmitting the hearing contents, for example, can be applied to the transmission of the hearing test contents in the test scene. For example, the audio transmission system can be applied to transmission of hearing test contents in scenes such as a middle-school exam and a high-school exam.
In summary, in the audio transmission system provided in the embodiment of the present invention, the multi-channel signal receiving subsystem is configured to demodulate the multi-channel rf source signals transmitted by the antenna feeder subsystem, and transmit the demodulated multi-channel audio source signals to the signal source processing subsystem; the signal source processing subsystem is used for carrying out signal processing on the multi-channel audio source signals and then transmitting the multi-channel audio source signals to the monitoring and switching subsystem; the monitoring and switching subsystem is used for transmitting the main road audio source signal in the multi-path audio source signals to the transmitting subsystem as a target audio source signal; the transmitting subsystem is also used for transmitting a secondary audio source signal which is different from the primary audio source signal in the multi-channel audio source signals to the transmitting subsystem as a target audio source signal when the switching condition is met; the transmitting subsystem is used for modulating a target audio source signal and transmitting at least one path of radio frequency signal obtained after modulation to the antenna feeder subsystem; the antenna feed subsystem is also used for transmitting at least one path of radio frequency signal so as to play the target audio data. The audio transmission system can acquire multiple paths of audio source signals, and the signal source processing subsystem performs signal processing on the multiple paths of audio source signals, so that the quality of the audio source signals is improved. The monitoring and switching subsystem switches the target audio source signals when meeting the switching condition, so that when the main audio source signal fails, other secondary audio source signals can be transmitted to the subsequent transmitting subsystem to play the target audio data, and the reliability of transmitting the audio data (such as hearing test contents) is improved.
When the audio transmission system is applied to a hearing test scene, when one path of audio source signal fails, other paths of audio source signals can be switched to in time to ensure normal playing of hearing test contents, so that normal running of the test process is ensured.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another audio transmission system 10 according to an embodiment of the present invention. Optionally, the antenna feed subsystem 101 includes a plurality of distributed receive antennas capable of achieving open-circuit reception of multiple rf source signals and at least one distributed transmit antenna. Each distributed receiving antenna is used for receiving a radio frequency source signal, and each distributed transmitting antenna is used for transmitting a transmitting signal. Each distributed receive antenna may be located at a different location to achieve high quality rf source signal acquisition, and the location of the distributed receive antennas may be determined by a technician based on experimentation and experience. The distributed receiving antenna can reduce the risk of external interference (such as interference caused by a black radio station) and the like, and improve the reliability of the radio frequency source signal received in an open circuit. Illustratively, the distributed antenna may comprise a multi-element yagi type antenna and the distributed transmit antenna may comprise a single dipole antenna.
The distributed transmit antenna supports the implementation of transmit propagation of radio frequency signals in the national frequency band when the transmit subsystem 105 performs national fm broadcast modulation on a target audio source signal. When the number of the distributed transmitting antennas is multiple, the distributed transmitting antennas are isolated in space, so that the distributed transmitting antennas cannot influence each other when transmitting radio-frequency signals simultaneously, and the normal work of each distributed transmitting antenna is ensured. Illustratively, the at least one distributed transmit antenna comprises an isolated dual antenna. Fig. 2 illustrates that the antenna feeder subsystem 101 includes 3 distributed receiving antennas a1 to a3 and two distributed transmitting antennas b1 and b2, where the distributed transmitting antennas b1 and b2 are isolated from each other.
In the embodiment of the present invention, when the number of the distributed transmission antennas is multiple, each distributed transmission antenna has a coverage area, and an overlapping area of the multiple distributed transmission antennas is greater than an overlapping threshold. When the overlap threshold is larger, the overlap area of the plurality of distributed transmitting antennas is larger, so that when any distributed transmitting antenna fails, other distributed transmitting antennas can still transmit radio frequency signals to the overlap area of the distributed transmitting antenna and the failed distributed transmitting antenna, and the reliability of audio transmission is further improved.
When any one of the radio frequency source signals received by the multi-channel signal receiving subsystem 102 is a digital television signal or a cable television signal, the any one of the radio frequency source signals corresponds to one channel, the one channel includes a plurality of program data packets, a target audio data packet exists in the plurality of program data packets, and each data packet has a unique identifier. When demodulating any one of the radio frequency source signals, the multi-channel signal receiving subsystem 102 may obtain the target audio data packet from the any one of the radio frequency source signals based on the identifier of the target audio data packet, obtain a simulated audio source signal, and transmit the simulated audio source signal to the source processing subsystem 103. After the multi-channel signal receiving subsystem 102 demodulates the multi-channel rf source signals, the audio source signals transmitted to the source processing subsystem 103 are all analog signals.
It should be noted that, when the source processing subsystem 103 does not have the delay adjustment function, the preset main audio source signal is an rf source signal with a higher transmission speed in the rf source signals. For example, assuming that the rf source signals include fm broadcast signals, digital television signals, and cable television signals, since the fm broadcast signals are transmitted at the fastest speed, the main audio source signal is a demodulated audio source signal of one channel of fm signals. Therefore, when the target audio source signal is switched from the main audio source signal to the secondary audio source signal, the transmission speed of the main audio source signal is higher than that of the secondary audio source signal, and therefore part of target audio data cannot be lost.
As shown in fig. 2, the monitoring and switching subsystem 104 may include: an audio transformer 1041, an audio source selection switching module 1042 and a display module 1043. The audio transformer 1041 is configured to allocate each channel of audio source signal to m channels of audio source signals, and transmit two channels of audio source signals in the m channels of audio source signals to the audio source selection switching module 1042 and the display module 1043, where m is greater than or equal to 2. The audio source selection switching module 1042 is configured to transmit the received main audio source signal as a target audio source signal to the transmitting subsystem 105. The display module 1043 is used for displaying the input audio source signal so that the technician can monitor the input audio source signal in real time.
The display module 1043 may be used for sound detection by a technician for the left and right channels of each audio source signal. For example, the display module 1043 may display each audio source signal in a color bar form, and the technician monitors the audio source signal based on the length or height of the color bar.
As shown in fig. 2, the monitoring and switching subsystem 104 may further include: a listening module 1044. The audio transformer 1041 is configured to transmit one audio source of the m audio source signals to the monitoring module 1044. The monitoring module 1044 can include a selection unit, which is configured to select one of the audio source signals input to the monitoring module 1044 for playing, so that a technician can monitor the input audio source signal in real time. For example, the selection unit may select the audio source signal indicated by the monitoring instruction to play when receiving the monitoring instruction for indicating one path of audio source signals. The listening module 1044 can support a play-out function (e.g., speaker play) or a headphone play function to enable a technician to perform real-time listening to an input audio source signal. Further, the listening module 1044 can also support volume adjustment during playing.
In the embodiment of the present invention, monitoring or listening to a signal (e.g., a target audio source signal or a radio frequency signal) output from the monitoring and switching subsystem 104 may be implemented, so that a technician can monitor or listen to the output signal. In one implementation, the audio source selection switching module 1042 may divide the target audio source signal into three paths, transmit one path of the target audio source signal to the transmitting subsystem 105, and transmit the other paths of the target audio source signal to the display module 1043 and/or the monitoring module 1044, so as to implement real-time monitoring and/or listening of the target audio source signal by a technician.
In another implementation, the antenna feeder subsystem 101 is further configured to transmit at least one rf signal to the multiple signal receiving subsystem 102. The multi-channel signal receiving subsystem 102 is further configured to demodulate at least one channel of radio frequency signal to obtain at least one channel of audio signal, and transmit the at least one channel of audio signal to the information source processing subsystem 103. The signal source processing subsystem 103 is further configured to perform signal processing on at least one received audio signal, and transmit the at least one processed audio signal to the audio transformer 1041. The audio transformer 1041 is configured to distribute each audio signal into n audio signals, and transmit two audio signals of the n audio signals to the monitoring module 1044 and the display module 1043, respectively, where n is greater than or equal to 2. The listening module 1044 is configured to select any one of the received audio signals to play. The display module 1043 is configured to display an input audio signal, so as to enable a technician to monitor and listen to the audio signal obtained based on at least one path of radio frequency signal processing in real time.
It should be noted that, the foregoing embodiment is described by taking the monitoring and switching subsystem 104 including the display module 1043 and the listening module 1044 as an example. The monitoring and switching subsystem may also only include the display module 1043 or the monitoring module 1044, and at this time, the audio transformer 1041 does not need to distribute the audio signals, and directly transmits each path of audio signals to the monitoring module 1044 or the display module 1043, so as to realize real-time monitoring or monitoring of the audio signals by technicians.
The audio source selection switching module 1042 is used for automatically switching the target audio source signal or switching the target audio source signal under manual control. Further, after the target audio source signal is switched to the secondary audio source signal, when the audio source selection switching module 1042 does not satisfy the switching condition, the target audio source signal may be switched to the primary audio source signal again, or the secondary audio source signal is still used as the target audio source signal.
For automatically switching the target audio source signal, the audio source selection switching module 1042 is configured to transmit the secondary audio source signal to the transmitting subsystem 105 as the target audio source signal when the switching condition is satisfied, that is, automatically switch the target audio source signal. Optionally, the switching condition includes: the received audio source signals are absent at least one of a main audio source signal and a main audio source signal having a volume less than a volume threshold. When the device for transmitting the main audio source signal in the antenna feeder subsystem 101, the multi-channel signal receiving subsystem 102, or the signal source processing subsystem 103 fails, the main audio source signal may be interrupted or the volume may be decreased, and at this time, the audio source selection switching module 1042 may switch the audio source signals of other channels (i.e., the secondary audio source signals) to be output as the target audio source signal, so as to ensure the normal playing of the target audio data. The handover condition may further include: the main audio source signal is a noise signal.
For switching the target audio source signal under manual control, the audio source selection switching module 1042 is configured to transmit any one of the audio source signals as the target audio source signal to the transmitting subsystem 105 when receiving a switching instruction sent by a technician to instruct the any one of the audio source signals. Alternatively, the switching instructions may be sent by a technician by monitoring the audio source signals in real-time and/or monitoring and switching the signals (e.g., radio frequency signals or target audio source signals) output by the subsystem 104. For example, when a technician monitors that colorstripes of the primary road audio source signal are unstable, a switching instruction may be sent for the secondary road audio source signal indicating that the colorstripes are stable; or when it is monitored that the quality of the primary path audio source signal is poor (for example, noise is large, or volume is too small), a switching instruction indicating a secondary path audio source signal with high quality may be sent.
The switching of the target audio source signal under manual control enables a technician to switch the target audio source signal to other secondary audio source signals in time to transmit to the transmitting subsystem 105 when monitoring that the primary audio source signal fails, so as to play the target audio data, thereby improving the reliability of transmission and playing of the audio data (such as listening test content). When the audio transmission system is applied to a hearing test scene, when one path of audio source signal fails, other paths of audio source signals can be switched to in time to ensure normal playing of hearing test contents, so that normal running of the test process is ensured.
As can be seen from the foregoing description, the audio source selection switching module 1042 can determine a target audio source signal to be transmitted to the transmitting subsystem 105 based on a selection instruction of a user, and the selecting unit in the listening module 1044 can determine a signal to be listened to based on a listening instruction of the user. The user can send a selection instruction or a monitoring instruction through the keys, and the key for sending the selection instruction and the key for sending the monitoring instruction are independent and have no influence.
Each path of audio source signal includes a left channel signal and a right channel signal, and the audio transformer 1041 is further configured to perform unbalanced transformation and balance on the left channel signal and the right channel signal of each path of audio source signal, so that the audio source signal maintains a higher signal-to-noise ratio, and the quality of the audio source signal is ensured.
Optionally, as shown in fig. 2, the monitoring and switching subsystem 104 may further include: an audio amplification block 1045 and a clipping circuit 1046. The audio amplification module 1045 is configured to amplify the audio source signal, and the amplitude limiting circuit 1046 is configured to limit the amplitude of the audio source signal, so as to further improve the signal quality of the audio source signal.
The transmit subsystem 105 may include a signal receiver and at least one frequency modulated transmitter. The signal receiver is configured to provide an external signal to the modulated frequency transmitter. The frequency modulation transmitters are used for modulating the received target audio source signal by using an external signal, and each frequency modulation transmitter is connected with one distributed transmitting antenna of the antenna feeder subsystem 101 through a radio frequency cable so as to transmit a radio frequency signal to the antenna feeder subsystem 101. Optionally, the signal receiver may include a global positioning signal receiver that may provide an in-phase 10 megahertz (MHz) external signal to the frequency modulated transmitter using the 10MHz external signal as a reference frequency. The frequency modulation transmitter can adopt a digital frequency modulation technology, the performance index of the frequency modulation transmitter is above grade A, and the signal quality of a modulated radio-frequency signal is ensured.
When the number of the fm transmitters is plural, the models of any two fm transmitters may be the same. When multiple fm transmitters modulate a target audio source signal, any two fm transmitters use the same stereo encoding mode and pre-emphasis feature settings. Alternatively, the frequency modulated transmitter may comprise a Field Programmable Gate Array (FPGA) device, such that modulation of the target audio source signal is achieved in the FPGA device using software radio-programmed methods. Still alternatively, the fm transmitter may further include an oven controlled crystal oscillator, which may lock to the 10MHz external signal using the oven controlled crystal oscillator and precisely lock to an analog/digital (D/a) conversion phase-locked loop clock in the FPGA device. When the constant-temperature crystal oscillator is used for modulating a target audio source signal, the temperature of the constant-temperature crystal oscillator can be in a range of-20 ℃ to +70 ℃ so as to ensure the stability between plus or minus 200 parts per billion (PPb). Fig. 2 illustrates an example where the transmit subsystem 105 includes a signal receiver 1051 and two modulated frequency transmitters 1052 and 1053.
The power subsystem 106 may include a UPS power supply that includes three modes of operation, a normal mode of operation, a battery mode of operation, and a static bypass mode of operation. In a normal operating mode, the UPS supplies power to the subsystems by converting mains power to a regulated power supply. In the battery operating mode, the UPS provides regulated power to the various subsystems for a limited time through its external battery. In a static bypass mode of operation, the UPS directly uses utility power to power each subsystem. When the commercial power fails or exceeds the predefined power parameter limit value, the UPS is switched from the normal operation mode to the battery operation mode. The static bypass is an internal bypass of the UPS, and the UPS can be automatically switched to a static bypass working mode under the condition of failure or can be manually switched to the static bypass working mode.
The battery capacity of the external battery of the UPS in the power supply subsystem 106 may ensure that the system continues to supply power for more than 2 hours to each subsystem of the audio transmission system after the mains power fails, so that each subsystem operates normally. This ensures that the external battery can continue to supply power when the utility power fails. When the audio transmission system is applied to a hearing test scene, the hearing test time is usually less than 2 hours, so that the external battery can ensure that each subsystem of the audio transmission system normally transmits and plays hearing test contents, and the normal execution of the test process is ensured.
In summary, in the audio transmission system provided in the embodiment of the present invention, the multi-channel signal receiving subsystem is configured to demodulate the multi-channel rf source signals transmitted by the antenna feeder subsystem, and transmit the demodulated multi-channel audio source signals to the signal source processing subsystem; the signal source processing subsystem is used for carrying out signal processing on the multi-channel audio source signals and then transmitting the multi-channel audio source signals to the monitoring and switching subsystem; the monitoring and switching subsystem is used for transmitting a main audio source signal in the multi-channel audio source signals to the transmitting subsystem as a target audio source signal; the transmitting subsystem is also used for transmitting a secondary audio source signal which is different from the primary audio source signal in the multi-channel audio source signals to the transmitting subsystem as a target audio source signal when the switching condition is met; the transmitting subsystem is used for modulating a target audio source signal and transmitting at least one path of radio frequency signal obtained after modulation to the antenna feeder subsystem; the antenna feed subsystem is also used for transmitting at least one path of radio frequency signal so as to play the target audio data. The audio transmission system can acquire multiple paths of audio source signals, and the signal source processing subsystem performs signal processing on the multiple paths of audio source signals, so that the quality of the audio source signals is improved. The monitoring and switching subsystem switches the target audio source signals when meeting the switching condition, so that when the main audio source signal fails, other secondary audio source signals can be transmitted to the subsequent transmitting subsystem to play the target audio data, and the reliability of transmitting the audio data (such as hearing test contents) is improved.
In addition, each subsystem of the embodiment of the invention has modular design, clear structure, distinct hierarchy and stable work, so that the quality of the transmitted audio source signal is higher, and the audio transmission system has better encryption performance, strong anti-interference performance and highly stable modulation. And when a plurality of transmitting antennas of the antenna feed subsystem are provided, a plurality of paths of radio frequency signals can be synchronously transmitted, the overlapping degree of the coverage ranges of the plurality of paths of radio frequency signals is higher, and the reliability of audio transmission is further improved. When the audio transmission system is applied to a hearing test scene, when one path of audio source signal fails, other paths of audio source signals can be switched to in time to ensure normal playing of hearing test contents, so that normal running of the test process is ensured.
The embodiment of the invention provides an audio transmission method, which is applied to an audio transmission system, wherein the audio transmission system comprises: the system comprises an antenna feed subsystem, a multi-channel signal receiving subsystem, a signal source processing subsystem, a monitoring and switching subsystem, a transmitting subsystem and a power supply subsystem. Referring to fig. 3, fig. 3 is a flowchart of an audio transmission method according to an embodiment of the present invention, where the method includes the following steps:
And step 320, the antenna feeder subsystem receives the multiple paths of radio frequency source signals and transmits the multiple paths of radio frequency source signals to the multiple paths of signal receiving subsystem, wherein each path of radio frequency source signal carries target audio data.
And step 330, the multi-channel signal receiving subsystem demodulates the received multi-channel radio frequency source signals to obtain multi-channel audio source signals, and transmits the multi-channel audio source signals to the information source processing subsystem.
And 340, the information source processing subsystem processes the received multi-channel audio source signals and transmits the processed multi-channel audio source signals to the monitoring and switching subsystem.
And 360, modulating the received target audio source signal by the transmitting subsystem to obtain at least one path of radio frequency signal, and transmitting the at least one path of radio frequency signal to the antenna feeder subsystem.
And 380, when the monitoring and switching subsystem meets the switching condition, transmitting a secondary audio source signal in the received multi-channel audio source signals to the transmitting subsystem as a target audio source signal, wherein the secondary audio source signal is different from the main audio source signal.
In summary, in the audio transmission method provided in the embodiment of the present invention, the multi-channel signal receiving subsystem demodulates the multi-channel rf source signals transmitted by the antenna feeder subsystem, and transmits the demodulated multi-channel rf source signals to the signal source processing subsystem; the information source processing subsystem carries out signal processing on the multi-channel audio source signals and then transmits the multi-channel audio source signals to the monitoring and switching subsystem; the monitoring and switching subsystem transmits a main audio source signal in the multi-channel audio source signals to the transmitting subsystem as a target audio source signal; when the switching condition is met, transmitting a secondary audio source signal which is different from the primary audio source signal in the multi-channel audio source signal to the transmitting subsystem as a target audio source signal; the transmitting subsystem modulates a target audio source signal and transmits at least one path of radio frequency signal obtained after modulation to the antenna feeder subsystem; the antenna feed subsystem transmits at least one path of radio frequency signal to play target audio data. The audio transmission system can acquire multiple paths of audio source signals, and the signal source processing subsystem performs signal processing on the multiple paths of audio source signals, so that the quality of the audio source signals is improved. The monitoring and switching subsystem switches the target audio source signals when meeting the switching condition, so that when a main audio source signal fails, other secondary audio source signals can be transmitted to a subsequent transmitting subsystem to play target audio data, and the reliability of transmitting the audio data (such as hearing test contents) is improved.
Optionally, the antenna feed subsystem includes a plurality of distributed receiving antennas and at least one distributed transmitting antenna, where each distributed receiving antenna is configured to receive a radio frequency source signal, and each distributed transmitting antenna is configured to transmit a radio frequency signal.
Optionally, the at least one distributed transmit antenna comprises an isolated dual antenna.
Optionally, the monitoring and switching subsystem comprises: the audio system comprises an audio transformer, an audio source selection switching module and a display module. The audio transformer is used for distributing each path of audio source signals into m paths of audio source signals and respectively transmitting two paths of audio source signals in the m paths of audio source signals to the audio source selection switching module and the display module, wherein m is more than or equal to 2; the audio source selection switching module is used for transmitting the received main road audio source signal serving as a target audio source signal to the transmitting subsystem; when the switching condition is met, the secondary audio source signal is used as a target audio source signal and transmitted to the transmitting subsystem; the display module is used for displaying the input audio source signal.
Optionally, the monitoring and switching subsystem further comprises: a monitoring module; the antenna feed subsystem is also used for transmitting at least one path of radio frequency signal to the multi-path signal receiving subsystem; the multi-channel signal receiving subsystem is also used for demodulating at least one channel of radio frequency signals to obtain at least one channel of audio signals and transmitting the at least one channel of audio signals to the information source processing subsystem; the signal source processing subsystem is also used for carrying out signal processing on at least one path of received audio signals and transmitting the processed at least one path of audio signals to the audio transformer; the audio transformer is used for distributing each audio signal into n audio signals and respectively transmitting two audio signals in the n audio signals to the monitoring module and the display module, wherein n is more than or equal to 2; the monitoring module is used for selecting any audio signal from the received audio signals to play; the display module is also used for displaying the input audio signal.
Optionally, the transmitting subsystem comprises a signal receiver and at least one frequency modulated transmitter; the signal receiver is used for providing an external signal to the frequency modulation transmitter; the frequency modulation transmitters are used for modulating the received target audio source signals by using external signals, and each frequency modulation transmitter is used for transmitting a radio frequency signal to the antenna feed subsystem.
Optionally, the number of the fm transmitters is multiple, and the models of any two fm transmitters are the same.
Optionally, the signal processing comprises: at least one of a delay adjustment, a level adjustment and a frequency response adjustment.
Optionally, the switching condition includes: the received audio source signals are absent at least one of a main audio source signal and a main audio source signal having a volume less than a volume threshold.
In summary, in the audio transmission method provided in the embodiment of the present invention, the multi-channel signal receiving subsystem demodulates the multi-channel rf source signals transmitted by the antenna feeder subsystem, and transmits the demodulated multi-channel audio source signals to the signal source processing subsystem; the information source processing subsystem carries out signal processing on the multiple audio source signals and then transmits the multiple audio source signals to the monitoring and switching subsystem; the monitoring and switching subsystem transmits a main road audio source signal in the multi-path audio source signals to the transmitting subsystem as a target audio source signal; when the switching condition is met, transmitting a secondary audio source signal which is different from the primary audio source signal in the multi-channel audio source signal to the transmitting subsystem as a target audio source signal; the transmitting subsystem modulates a target audio source signal and transmits at least one path of radio frequency signal obtained after modulation to the antenna feeder subsystem; the antenna feed subsystem transmits at least one path of radio frequency signal to play target audio data. The audio transmission system can acquire the multi-channel audio source signals, and the signal source processing subsystem carries out signal processing on the multi-channel audio source signals, so that the quality of the audio source signals is improved. The monitoring and switching subsystem switches the target audio source signals when meeting the switching condition, so that when a main audio source signal fails, other secondary audio source signals can be transmitted to a subsequent transmitting subsystem to play target audio data, and the reliability of transmitting the audio data (such as hearing test contents) is improved.
In addition, when a plurality of transmitting antennas of the antenna feeder subsystem are provided, a plurality of paths of radio frequency signals can be synchronously transmitted, the overlapping degree of the coverage areas of the paths of radio frequency signals is higher, and the reliability of audio transmission is further improved. When the audio transmission method is applied to a hearing test scene, when one path of audio source signal fails, other paths of audio source signals can be switched to in time to ensure normal playing of hearing test contents, so that normal running of the test process is ensured.
The functional module for executing each step of the audio transmission method provided by the embodiment of the invention can refer to the audio transmission system provided by the embodiment of the invention, and has corresponding beneficial effects of the audio transmission system.
It should be noted that, in the embodiment of the audio transmission system, the subsystems, modules, and units included in the audio transmission system are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the subsystems, modules and units are only used for distinguishing one subsystem from another, and are not used for limiting the protection scope of the invention.
In the embodiments of the present invention, "at least one" refers to one or more, "a plurality" refers to two or more, "and/or" is only one kind of association relation describing an associated object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. Unless explicitly defined otherwise.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An audio transmission system, comprising:
the system comprises an antenna feed subsystem, a multi-channel signal receiving subsystem, an information source processing subsystem, a monitoring and switching subsystem, a transmitting subsystem and a power supply subsystem;
the antenna feed subsystem is used for receiving multiple paths of radio frequency source signals and transmitting the multiple paths of radio frequency source signals to the multiple paths of signal receiving subsystems, and each path of radio frequency source signal carries target audio data;
the multi-channel signal receiving subsystem is used for demodulating the received multi-channel radio frequency source signals to obtain multi-channel audio source signals and transmitting the multi-channel audio source signals to the information source processing subsystem;
the signal source processing subsystem is used for processing the received multi-channel audio source signals and transmitting the processed multi-channel audio source signals to the monitoring and switching subsystem;
the monitoring and switching subsystem is used for transmitting a main audio source signal in the received multi-path audio source signals to the transmitting subsystem as a target audio source signal; the transmitting subsystem is further configured to transmit a secondary audio source signal of the received multiple audio source signals to the transmitting subsystem as the target audio source signal when a switching condition is satisfied, where the secondary audio source signal is different from the primary audio source signal;
the transmitting subsystem is used for modulating the received target audio source signal to obtain at least one path of radio frequency signal and transmitting the at least one path of radio frequency signal to the antenna feeder subsystem;
the antenna feed subsystem is also used for transmitting the at least one path of radio frequency signal so as to play the target audio data;
the power supply subsystem is used for supplying power to each subsystem in the audio transmission system;
the monitoring and switching subsystem comprises: the audio transformer, the audio source selection switching module and the display module are arranged in the audio system;
the audio transformer is used for distributing each path of audio source signals into m paths of audio source signals and respectively transmitting two paths of audio source signals in the m paths of audio source signals to the audio source selection switching module and the display module, wherein m is more than or equal to 2;
the audio source selection switching module is used for transmitting the received main road audio source signal as the target audio source signal to the transmitting subsystem; and transmitting the secondary audio source signal to the transmitting subsystem as the target audio source signal when a switching condition is satisfied;
the display module is used for displaying the input audio source signal.
2. The audio transmission system of claim 1, wherein said antenna feed subsystem comprises a plurality of distributed receive antennas and at least one distributed transmit antenna, each of said distributed receive antennas being configured to receive a single said rf source signal, and each of said distributed transmit antennas being configured to transmit a single said rf signal.
3. The audio transmission system of claim 2, wherein the at least one distributed transmit antenna comprises an isolated dual antenna.
4. The audio transmission system of claim 1, wherein the monitoring and switching subsystem further comprises: a monitoring module;
the antenna feeder subsystem is also used for transmitting the at least one path of radio frequency signal to the multi-path signal receiving subsystem;
the multi-channel signal receiving subsystem is further configured to demodulate the at least one channel of radio frequency signal to obtain at least one channel of audio signal, and transmit the at least one channel of audio signal to the signal source processing subsystem;
the signal source processing subsystem is further configured to perform signal processing on the received at least one path of audio signal, and transmit the processed at least one path of audio signal to the audio transformer;
the audio transformer is used for distributing each path of audio signal into n paths of audio signals and respectively transmitting two paths of audio signals in the n paths of audio signals to the monitoring module and the display module, wherein n is more than or equal to 2;
the monitoring module is used for selecting any audio signal from the received audio signals to play;
the display module is also used for displaying the input audio signal.
5. The audio transmission system of claim 1, wherein the transmit subsystem comprises a signal receiver and at least one frequency modulated transmitter;
the signal receiver is used for providing an external signal to the frequency modulation transmitter;
the frequency modulation transmitters are used for modulating the received target audio source signals by using the external signals, and each frequency modulation transmitter is used for transmitting one path of radio frequency signals to the antenna feed subsystem.
6. The audio transmission system of claim 5, wherein said fm transmitters are plural in number, and any two of said fm transmitters are of the same model.
7. The audio transmission system of claim 1, wherein the signal processing comprises: at least one of a delay adjustment, a level adjustment, and a frequency response adjustment.
8. The audio transmission system according to claim 1, wherein the switching condition includes: the audio source signal is absent from the received audio source signals and the main audio source signal has a volume less than at least one of a volume threshold.
9. An audio transmission method applied to an audio transmission system, the audio transmission system comprising: the system comprises an antenna feed subsystem, a multi-channel signal receiving subsystem, an information source processing subsystem, a monitoring and switching subsystem, a transmitting subsystem and a power supply subsystem; the method comprises the following steps:
the power supply subsystem supplies power to each subsystem in the audio transmission system;
the antenna feeder subsystem receives a plurality of paths of radio frequency source signals and transmits the plurality of paths of radio frequency source signals to the plurality of paths of signal receiving subsystems, and each path of radio frequency source signal carries target audio data;
the multi-channel signal receiving subsystem demodulates the received multi-channel radio frequency source signals to obtain multi-channel audio source signals, and transmits the multi-channel audio source signals to the information source processing subsystem;
the information source processing subsystem carries out signal processing on the received multi-channel audio source signals and transmits the processed multi-channel audio source signals to the monitoring and switching subsystem;
the monitoring and switching subsystem transmits a main audio source signal in the received multi-channel audio source signals to the transmitting subsystem as a target audio source signal;
the transmitting subsystem modulates the received target audio source signal to obtain at least one path of radio frequency signal and transmits the at least one path of radio frequency signal to the antenna feeder subsystem;
the antenna feeder subsystem transmits the at least one path of radio frequency signal to play the target audio data;
when the monitoring and switching subsystem meets the switching condition, transmitting a secondary audio source signal in the received multiple audio source signals to the transmitting subsystem as the target audio source signal, wherein the secondary audio source signal is different from the primary audio source signal;
the monitoring and switching subsystem comprises: the audio transformer, the audio source selection switching module and the display module;
the audio transformer is used for distributing each path of audio source signals into m paths of audio source signals and respectively transmitting two paths of audio source signals in the m paths of audio source signals to the audio source selection switching module and the display module, wherein m is more than or equal to 2;
the audio source selection switching module is used for transmitting the received main road audio source signal serving as a target audio source signal to the transmitting subsystem; when the switching condition is met, the secondary audio source signal is used as a target audio source signal and is transmitted to the transmitting subsystem;
the display module is used for displaying the input audio source signal.
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