CN118118115A - Information source enhancement method and system for broadcast audio - Google Patents
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- H—ELECTRICITY
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- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
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- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/56—Arrangements characterised by components specially adapted for monitoring, identification or recognition covered by groups H04H60/29-H04H60/54
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Abstract
A method and a system for enhancing information source of broadcast audio relate to the technical field of broadcast television signal monitoring. The method comprises the following steps: acquiring object sound PCM audio of an object transmitter and PCM audio of a local mixed signal; determining an object sound mixed signal according to the object sound PCM audio and the PCM audio; determining a target object sound signal according to the object reference sound and the object sound mixed signal; determining the frequency spectrum of the object sound signal, and generating noise according to the frequency spectrum; and superposing the noise and the object sound signal to obtain a target AM signal, and transmitting the target AM signal to a transmitter. By generating the noise of the frequency spectrum corresponding to the object sound to perform superposition interference on the AM signal of the object sound, the effect of enhancing the information source is achieved.
Description
Technical Field
The application relates to the technical field of broadcast television signal monitoring, in particular to a broadcast audio signal monitoring method, a system, electronic equipment and a storage medium.
Background
With rapid development of information technology and wide application of digital broadcasting technology, the requirements of sound quality and transmission efficiency of broadcasting systems are increasing. The signal is susceptible to various disturbances during transmission, resulting in a degradation of sound quality. Moreover, the unknown suspicious broadcasting often contains harmful audio content, so that the transmission efficiency of analog signals is low, and the requirements of the current digital and high-quality broadcasting cannot be met. With the popularity of digital audio technology, and in particular Pulse Code Modulation (PCM) technology, it is still a technical challenge to provide higher quality audio signals, but in practical applications, how to effectively monitor and enhance broadcast signals, avoiding the spread of harmful audio.
At present, in the existing broadcast signal enhancement method, in the process of separating and processing target audio, the effect of enhancing an audio signal is achieved mainly by extracting main contents to be propagated from a plurality of signals. However, in practical application, the transmission of the broadcast signal is interfered by local multiple signals, and only the signal separation mode is adopted to enhance the signals, so that the separated signals still contain interference signals, and it is difficult to accurately enhance the signal source of the target audio.
Disclosure of Invention
The application provides a method and a system for enhancing a signal source of broadcast audio, which have the effect of enhancing the signal source by generating noise of a frequency spectrum corresponding to an object sound to carry out superposition interference on an AM signal of the object sound.
In a first aspect, the present application provides a method for enhancing a source of broadcast audio, including:
Acquiring object sound PCM audio of an object transmitter and PCM audio of a local mixed signal;
determining an object sound mixed signal according to the object sound PCM audio and the PCM audio;
determining a target object sound signal according to the object reference sound and the object sound mixed signal;
determining the frequency spectrum of the object sound signal, and generating noise according to the frequency spectrum;
and superposing the noise and the object sound signal to obtain a target AM signal, and transmitting the target AM signal to a transmitter.
By adopting the technical scheme, the PCM audio of the object sound of the object transmitter and the PCM audio of the local mixed signal are obtained and mixed to generate the object sound mixed signal, and then the object reference sound is utilized to extract the object sound signal from the mixed signal, so that the effect of accurately obtaining the object broadcast audio from the mixed background environment is realized. After the target object sound signal is extracted, the noise interference aiming at the audio frequency spectrum can be customized and generated by analyzing the frequency spectrum characteristics of the target object sound signal, the noise is superimposed into the target object sound signal, and the synthesized target AM signal is sent to a transmitter for playing. The mixed signal containing the target audio is obtained, the target audio is accurately extracted by utilizing the reference sound, customized noise is generated according to the spectrum characteristics of the target audio to carry out superposition interference, and finally, the accurate positioning and effective interference of specific broadcast contents can be realized, and poor audio propagation is restrained, so that the effect of enhancing the information source is achieved.
Optionally, the original AM signal in the corresponding direction of the object sound transmitter is collected through a directional AM broadcasting antenna; converting the original AM signal into the object sound PCM audio according to a preset PCM format; collecting the original AM signal and the background noise signal in all directions through the omnidirectional AM broadcasting antennas of each monitoring point, taking the original AM signal and the background noise signal as the local mixed signal, and converting the local mixed signal into the PCM audio in the preset PCM format.
By adopting the technical scheme, the original analog AM signal in the direction of the object transmitter is specially collected as the object sound signal through the directional AM broadcasting antenna, and then the object sound signal is converted into the object sound PCM audio through PCM coding, so that the target object sound signal and interference signals in other directions can be effectively isolated, and the obtained object sound signal is ensured to be clearly usable. An omnidirectional AM antenna is arranged at a plurality of monitoring points, original analog AM signals and background noise in all directions are collected, and the same PCM coding is carried out on the original analog AM signals and the background noise and object sound signals, so that local mixed signals containing various background noise in a target area can be obtained, and the complete audio environment condition under a monitoring scene is reflected. The directional antenna ensures the isolation of the object sound signals to be clear, the omnidirectional antenna is used for acquiring mixed background noise, and PCM code conversion is carried out on the mixed background noise, so that distinguishable standard digital audio representation can be obtained, subsequent audio analysis and processing are facilitated, and the object sound signals are accurately extracted from the mixed signals.
Optionally, acquiring a first sampling time of the object sound PCM audio and a second sampling time of the PCM audio; and combining the object sound PCM audio and the PCM audio according to the first sampling time and the second sampling time to obtain the object sound mixed signal.
By adopting the technical scheme, the accurate sampling time information of the object sound PCM audio and the local mixed PCM audio is respectively acquired, wherein the accurate sampling time information comprises the initial sampling time and the sampling interval during encoding. According to the difference of sampling time of the two, the time axis of the audio signal can be accurately corrected and aligned, sampling clock errors between acquisition systems are solved, and synchronization of the object sound PCM audio and the local mixed PCM audio on the time axis is realized. Based on the time axis alignment, the mixing of the object sound PCM audio and the local mixing PCM audio can be naturally and reasonably performed, and the object sound mixed signal with continuous time sequence containing the target object sound signal and the background noise is generated.
Optionally, performing information source enhancement on the object reference sound to obtain a broadcast enhancement signal; and matching the target object sound signal in the object sound mixed signal according to the frequency characteristic and the time domain characteristic of the broadcast enhanced signal.
By adopting the above technical scheme, the broadcast enhancement signal containing the amplified target audio feature information can be generated by enhancing the target audio component in the target reference sound and suppressing the background component. By means of the enhanced target audio frequency characteristics and the time domain characteristics in the broadcast enhancement signal, the corresponding target object sound signals can be more accurately and more efficiently matched and positioned in the object sound mixed signal. Compared with the method directly based on the original object reference sound, the method and the device can greatly improve the accuracy and efficiency of extracting the target object sound signal from the mixed signal by utilizing the prominent and enhanced target audio characteristic information contained in the broadcast enhancement signal enhanced by the special information source. The broadcast enhancement signal is generated through information source enhancement, and is guided by taking the information source enhancement signal as a reference, so that the target object sound signal is rapidly and accurately obtained from the complex mixed signal.
Optionally, acquiring a signal-to-noise ratio, a frequency spectrum and a harmonic distortion ratio of the target object sound signal; and evaluating the signal strength value of the object sound mixed signal according to the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio.
By adopting the technical scheme, after the target object sound signal is extracted, the technical index evaluation can be comprehensively carried out on the target object sound signal, wherein the technical index evaluation comprises three aspects of signal-to-noise ratio, frequency spectrum distribution and harmonic distortion ratio. The signal-to-noise ratio reflects the ratio relation of the target audio frequency and the background noise, the frequency spectrum represents the frequency distribution range of the audio frequency, and the harmonic distortion ratio detects the distortion degree of the audio frequency. By comprehensively judging the three technical indexes, comprehensive quality analysis and effect evaluation can be performed on the currently obtained target object sound signal. Based on the index evaluation result of the target audio, the signal intensity level of the whole object sound mixed signal can be estimated, and whether the subsequent signal intensity adjustment and optimization are needed or not is judged. The multi-dimensional technical index of the target audio is obtained, the quality of the mixed signal is evaluated according to the multi-dimensional technical index, and the accurate analysis and the signal intensity optimization of the audio synthesis effect are realized.
Optionally, determining a signal intensity difference according to the signal intensity value and the standard signal intensity value of the object sound mixed signal; determining a transmitting power adjustment parameter corresponding to the signal strength difference according to a power mapping table; and adjusting the transmitter according to the transmission power adjustment parameter.
By adopting the technical scheme, the signal intensity value of the object sound mixed signal is compared with the standard signal intensity value, so that the signal intensity difference between the signal intensity value and the standard signal intensity value can be determined. By using a preset power mapping table, corresponding transmitting power compensation adjustment parameters can be automatically inquired according to the signal strength difference value. After the transmission power adjustment parameters are obtained, the transmission power of the transmitter can be correspondingly compensated and optimally adjusted. According to the signal intensity condition of the target audio component of the object sound mixed signal, the power compensation parameter query is automatically carried out, the transmitting power of the transmitter is adjusted, and the intensity level of the target audio in the mixed signal is adjusted to the standard intensity value. By mapping the signal intensity difference value and the power parameter, intelligent optimization and adjustment of the target audio intensity in the mixed signal are realized, and thus a high-quality audio synthesis effect is obtained.
Optionally, the target AM signal is converted to an analog audio signal by a DA/AD device.
By adopting the technical scheme, after the digital AM modulation for target object sound signal synthesis is obtained, the digital AM modulation is converted into analog by the DA/AD conversion equipment. The DA/AD conversion equipment is arranged in an intranet and is used for converting digital signals and analog signals, so that the intranet and the extranet can be isolated, and potential safety hazards caused by exposure of digital target AM signals are avoided. After conversion, the audio signal is continuously transmitted in an intranet in an analog audio form, and then is input into a transmitter for transmission, so that the analog audio input requirement of the transmitter is met. Through setting up intranet DA/AD equipment and carrying out digital AM signal and analog audio signal conversion, when guaranteeing the signal emission effect, also ensured the safety isolation of target digital signal, avoided the direct security risk who leaks of digital AM, improved the security of object sound signal separation and processing.
In a second aspect of the application, a source enhancement system for broadcasting audio is provided.
The audio acquisition module is used for acquiring the object sound PCM audio of the object transmitter and the PCM audio of the local mixed signal;
The signal processing module is used for determining an object sound mixed signal according to the object sound PCM audio and the PCM audio; determining a target object sound signal according to the object reference sound and the object sound mixed signal;
The noise generation module is used for determining the frequency spectrum of the object sound signal and generating noise according to the frequency spectrum;
The signal superposition module is used for superposing the noise and the object sound signal to obtain a target AM signal, and transmitting the target AM signal to a transmitter
In a third aspect of the application, an electronic device is provided.
A source enhancement system for broadcast audio comprises a memory, a processor and a program stored in the memory and capable of running on the processor, wherein the program can be loaded and executed by the processor to realize a source enhancement method for broadcast audio.
In a fourth aspect of the application, a computer readable storage medium is provided.
A computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to implement a method of source enhancement of broadcast audio.
In summary, one or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
By adopting the technical scheme of the application, the PCM audio of the object sound of the object transmitter and the PCM audio of the local mixed signal are obtained and mixed to generate the object sound mixed signal, and then the object reference sound is utilized to extract the target object sound signal from the mixed signal, thereby realizing the effect of accurately obtaining the target broadcast audio from the mixed background environment. After the target object sound signal is extracted, the noise interference aiming at the audio frequency spectrum can be customized and generated by analyzing the frequency spectrum characteristics of the target object sound signal, the noise is superimposed into the target object sound signal, and the synthesized target AM signal is sent to a transmitter for playing. The mixed signal containing the target audio is obtained, the target audio is accurately extracted by utilizing the reference sound, customized noise is generated according to the spectrum characteristics of the target audio to carry out superposition interference, and finally, the accurate positioning and effective interference of specific broadcast contents can be realized, and poor audio propagation is restrained, so that the effect of enhancing the information source is achieved.
Drawings
Fig. 1 is a schematic flow chart of a method for enhancing a source of broadcast audio according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a source enhancement system for broadcasting audio according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an electronic device according to the disclosure.
Reference numerals illustrate: 300. an electronic device; 301. a processor; 302. a communication bus; 303. a user interface; 304. a network interface; 305. a memory.
Detailed Description
In order that those skilled in the art will better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments.
In describing embodiments of the present application, words such as "for example" or "for example" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "such as" or "for example" in embodiments of the application should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "or" for example "is intended to present related concepts in a concrete fashion.
In the description of embodiments of the application, the term "plurality" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating an indicated technical feature. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The embodiment of the application provides a source enhancement method for broadcasting audio. In one embodiment, please refer to fig. 1, fig. 1 is a flowchart illustrating a method for enhancing a source of broadcast audio according to an embodiment of the present application, which may be implemented by a computer program, and the computer program may be integrated into an application or may be run as a separate tool application. The method can be realized by depending on a singlechip, and can also be operated in a source enhancement system of broadcast audio based on a von neumann system. Specifically, the method may include the steps of:
step 101: the method comprises the steps of obtaining object sound PCM audio of an object transmitter and PCM audio of a local mixed signal.
Wherein the object transmitter refers to a transmitting source of unknown suspicious broadcasting that needs to be monitored and subjected to interference processing. In embodiments of the present application, an object transmitter may be understood as a transmitting station of an unlicensed radio station that plays a program containing harmful content. The object transmitter is configured to propagate a broadcast signal to the target listening area. These broadcast signals may contain harmful content, which needs to be monitored and processed for interference.
Object sound PCM audio refers to an audio signal that is collected from an object transmitter and digitally encoded.
PCM audio of a local mix refers to an audio signal obtained by acquisition and digital encoding of various background noise signals in a local environment.
Specifically, an original analog AM signal in the direction of the object transmitter is collected as an object sound signal, and an analog AM signal and a noise signal in the background of each monitoring point are collected as local mixed signals. The acquired analog AM signal is then converted to a digital audio signal in PCM format. PCM encoding is used because it can represent audio signals with fidelity, facilitating subsequent analysis of the audio. And the sample times of the object sound signal and the local mix signal are recorded, respectively, for subsequent audio mixing. By simultaneously acquiring the object sound signal and the local mixed noise signal and adopting PCM coding and digitizing, the object sound can be conveniently distinguished and extracted, and the subsequent targeted generation of the reference audio signal of the analog object audio is also convenient.
On the basis of the above embodiment, as an alternative embodiment, in step 101: the step of acquiring the object sound PCM audio of the object transmitter and the PCM audio of the local mixed signal may further comprise the steps of:
step 201: and acquiring an original AM signal in the corresponding direction of the object sound transmitter through the directional AM broadcast antenna.
The directional AM broadcasting antenna is an antenna with a directional receiving function, and can receive AM broadcasting electromagnetic waves in a specific direction. In the embodiment of the present application, the directional AM broadcasting antenna may be understood as a parabolic antenna or the like, and may receive an AM broadcasting signal of a specific direction by adjusting the direction. The directional AM broadcast antenna is used for receiving AM broadcast electromagnetic wave signals containing target audio content sent from the object transmitter, and by adjusting the direction of the directional antenna to point to the object transmitter, the target audio signal and interference noise in other directions can be distinguished.
Illustratively, the approximate position of the object transmitter is determined by signal detection, and then the direction of the directional AM antenna is adjusted to point to the object transmitter. The directivity of the directional AM antenna ensures that it mainly receives the AM broadcast electromagnetic wave signal arriving from the direction of the subject transmitter, and then collects the original analog AM broadcast signal during transmission, i.e., the original analog signal that has not been subjected to any demodulation or digitizing process, through the electromagnetic wave receiving function of the directional antenna. The directional antenna is adopted and points to the object transmitter to collect the original analog AM signal, so that the target object sound signal and interference signals in other directions can be effectively isolated.
Step 202: and converting the original AM signal into the object sound PCM audio according to a preset PCM format.
Specifically, PCM encoding parameters of an audio signal, including sampling rate, quantization bit width, encoding scheme, etc., are set as standard PCM encoding formats. Then, the received analog AM signal is used as input, and the analog signal is converted into a digital PCM code stream through processes such as sample hold, quantization coding and the like. The setting of PCM coding parameters directly affects the quality and data rate of the converted sound. And organizing and packaging the code stream into audio data frames, recording corresponding time information, and outputting the audio which is the object sound PCM audio. By setting PCM encoding parameters for the received signal and performing analog-to-digital conversion, a digital audio signal in a standard format can be obtained.
Step 203: the original AM signals and the background noise signals in all directions are collected through the omnidirectional AM broadcast antennas of all monitoring points.
The omni-directional AM broadcasting antenna refers to an antenna capable of receiving an AM broadcasting electromagnetic wave signal from all directions. In the embodiment of the present application, the omni-directional AM broadcasting antenna may be understood as a short antenna group arranged in a three-dimensional manner, and may receive AM broadcasting signals from all directions of 360 degrees around the antenna. The omni-directional AM broadcast antenna is used to collect audio environment mixed signals containing various background noise in a target area. By providing for multi-point monitoring acquisition of an omni-directional signal, mixed audio information including target object sound signals and other ambient interference sounds can be obtained.
Specifically, omnidirectional AM antennas are respectively provided at a plurality of monitoring points, which cover a target area of an object transmitter. An omni-directional AM antenna can receive ground wave signals from all directions around the antenna. And receiving signals of the positions of all monitoring points through the omnidirectional antenna, and obtaining mixed signals containing various noises contained in the target area. Which contains both the object transmitter signal and other ambient noise. The purpose of obtaining the local mix signal is to provide information containing the ambient audio background for extracting the target object sound signal therefrom. The influence of background noise on a target signal can be evaluated, and the acquisition of the local audio environment is realized by acquiring the omnibearing mixed signal.
Step 204: the original AM signal and the background noise signal are used as local mixed signals, and the local mixed signals are converted into PCM audio in a preset PCM format.
Specifically, after the omni-directional mixed signal is acquired, digital encoding is required for audio processing. The original analog AM signal acquired through the omni-directional antenna and various background noise are considered herein as mixed audio signals of the local environment. The same PCM encoding process is performed on this mixed signal in order to obtain a standard digital audio representation that matches the object sound signal, to facilitate comparison and analysis of the two. By combining the received analog signal containing the target AM signal and noise into a local mix signal, the overall input signal is obtained. And referring to preset PCM coding parameters, carrying out digital processing such as sampling, quantization, coding and the like on the mixed signal, converting the mixed signal into a digital audio code stream in a PCM format, and adopting the same PCM coding parameters as the object sound signal to ensure the consistency of digital representation of the mixed signal and the object sound signal so as to generate PCM format audio data representing the local mixed audio signal. The original analog signal is converted into a standard digital code stream by a unified PCM encoding method. The digital audio of the mixed signal and the object audio adopt the same coding parameters, so that the subsequent signal analysis and processing are convenient.
Step 102: determining an object sound mixed signal according to the object sound PCM audio and the PCM audio; and determining a target object sound signal according to the object reference sound and the object sound mixed signal.
Wherein the object reference sound refers to a known reference audio signal that can represent the audio content of the program being played by the object transmitter. In embodiments of the present application, an object reference tone may be understood as an audio sample obtained from another channel that is the same or similar to the audio content of a program being played by an object transmitter, the object reference tone being used to identify and match a target object tone signal in a mixed signal.
The target object sound signal refers to an audio signal representing target broadcast content of the object transmitter extracted from the object sound mixed signal. In an embodiment of the present application, the target object sound signal may be understood as an audio signal portion of the audio content of the program being played by the corresponding object transmitter that is matched with the object reference sound in the mixed signal containing the background noise.
Specifically, the object sound PCM audio and the local mixed PCM audio are mixed and combined to generate an object sound mixed signal. Wherein the synchronization alignment is required according to the time axis information of both, and then the mixed audio is synthesized in proportion. The purpose of the combination is to simulate the mixing effect in the actual signal transmission process and obtain a mixed audio containing the target object sound signal and the background noise. And matching in the mixed signal by using the object reference sound of the program corresponding to the known object transmitter so as to extract a target object sound signal. The matching mode is to locate the best matching audio in the mixed signal as the target object sound signal according to the frequency characteristics, rhythm characteristics and the like of the object reference sound. The reference sound provides a priori information of the target audio, leading to the extraction of the target signal. By constructing the mixed signal and guiding by utilizing the reference sound, the target object sound signal can be accurately extracted from the mixed audio containing background noise, and a foundation is laid for subsequent targeted audio generation and interference processing.
Based on the above embodiment, as an alternative embodiment, in step 102: determining the object sound mixed signal according to the object sound PCM audio and the PCM audio, and the method can further comprise the following steps:
Step 301: a first sample time of the object sound PCM audio and a second sample time of the PCM audio are obtained.
Wherein, the first sampling time refers to sampling time information in the process of collecting and digitally encoding the object sound PCM audio. In an embodiment of the present application, the first sampling time may be understood as a start sampling time and sampling interval time information when the object sound analog signal is PCM encoded.
The second sample time refers to sample time information during acquisition and digital encoding of the local mixed signal PCM audio. In an embodiment of the present application, the second sampling time may be understood as a start sampling time and sampling interval time information when the mixed signal is PCM encoded.
Specifically, when the received analog object sound signal is subjected to PCM coding, the starting sampling time and sampling interval of the PCM coding process are accurately recorded, and first sampling time information of the object sound PCM audio frequency is formed. When the received analog mixed signal is subjected to PCM coding, the initial sampling time and sampling interval of the PCM coding process are recorded accurately, second sampling time information of mixed PCM audio is formed, and the two kinds of PCM audio time information are stored for later use. The accurate sampling time information of the two audios is obtained, and the two audios can be aligned and adjusted according to the sampling time difference when the two audios are mixed and synthesized, so that the two audios are consistent in time, and the mixed audios with consistent time sequences are synthesized.
Step 302: and combining the object sound PCM audio and the PCM audio according to the first sampling time and the second sampling time to obtain an object sound mixed signal.
Specifically, the difference between the first sampling time and the second sampling time of two types of audio is analyzed, and the time axis of the audio is corrected according to the time difference, so that the alignment of the two types of audio is realized. Thus, sampling clock errors caused by different acquisition systems can be solved. And setting a reasonable mixing proportion, performing mix operation on the object sound PCM audio and the local mixed PCM audio, dynamically adjusting the volume of the object sound PCM audio and the local mixed PCM audio, and superposing the object sound PCM audio and the local mixed PCM audio to generate an object sound mixed signal containing an object sound signal and background noise. The purpose of mixing is to simulate the effect of mixing the object sound signal with background noise when the object sound signal propagates from the transmitter to the receiving end, and obtain a mixed audio matched with the actual monitored scene. The time axis alignment ensures the time sequence consistency of the mixing, the mixing operation ensures that the signals are mixed more naturally, and the synthesized mixed audio can reflect the audio condition under the monitoring scene.
Based on the above embodiment, as an alternative embodiment, in step 102: the step of determining the target object sound signal based on the object reference sound and the object sound mixed signal may further include the steps of:
step 303: and carrying out information source enhancement on the object reference sound to obtain a broadcast enhancement signal.
Where source enhancement refers to the process of processing an audio signal to enhance the components in which the target sound source is represented. In embodiments of the present application, source enhancement may be understood as the process of selectively enhancing critical bands representing the characteristics of target audio by analyzing the audio spectrum and suppressing non-critical bands, thereby highlighting the target audio component.
The broadcast enhancement signal refers to an audio signal containing enhancement target audio features generated after source enhancement processing of the object reference sound. In an embodiment of the present application, a broadcast enhancement signal may be understood as an audio signal synthesized to contain prominent target audio features after target audio components are enhanced and background components are suppressed in an object reference sound by a source enhancement algorithm. The broadcast enhancement signal is used to provide an audio reference containing enhanced target features when the target object signal is subsequently extracted to increase the speed and accuracy of target audio matching and localization using the reference sound.
Specifically, the spectral distribution of the reference sound is analyzed, and the main speech band range in which the target audio information is represented is determined. Then the system adopts a wave beam forming algorithm to selectively enhance in the key voice frequency bands, so that the target voice characteristics are more prominent in the reference voice; the suppression is performed in other ranges of the non-critical frequency band, so that the background interference characteristic is compressively weakened. By this combined enhancement and suppression signal processing, the system is able to generate a reference sound signal, i.e., a broadcast enhancement signal, that contains the amplified enhanced target audio characteristic information. The purpose of obtaining a broadcast enhancement signal is to enable more accurate and faster matching and localization by virtue of the apparent target features enhanced therein, for subsequent use in extracting target audio from a mixed signal.
Step 304: and matching the target object sound signal in the object sound mixed signal according to the frequency characteristic and the time domain characteristic of the broadcast enhancement signal.
Specifically, the main frequency component distribution of the enhanced target audio is obtained; and meanwhile, the time domain characteristics are analyzed, and the time domain information such as rhythm, tone change and the like of the target audio is acquired. And searching the audio fragments which are most matched with the frequency characteristics and the time domain characteristics in the object sound mixed signal, and extracting the audio fragments as target object sound signals. The matching basis is that the frequency components are similar and the time domain changes are consistent. By relying on the enhanced target audio features in the broadcast enhancement signal for guidance, the efficiency and accuracy of locating and matching the target audio signal in the mixed signal can be improved. The object sound signal containing the object audio content is obtained, the object audio is accurately obtained from the mixed environment sound by matching and extracting, a foundation is laid for subsequent analysis or interference processing of the audio content, and the enhancement signal ensures the high efficiency of extraction.
Based on the above embodiment, as an alternative embodiment, in step 102: the target object sound signal is determined according to the object reference sound and the object sound mixed signal, and the method further comprises the following steps:
Step 305: and acquiring the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio of the target object sound signal.
Specifically, the signal-to-noise ratio test is carried out on the extracted target object sound signal to obtain the ratio of the signal to background noise energy, and the signal definition is evaluated. And carrying out frequency spectrum analysis on the audio, determining the distribution of main frequency components of the audio, and obtaining the frequency characteristics of the audio. And measuring the harmonic distortion condition of the audio frequency to obtain the harmonic distortion ratio parameter of the audio signal. By acquiring the technical index parameters of the three aspects, the system can comprehensively judge the quality, the characteristics and the effect of the target audio signal, and provides basis for subsequent audio processing and effect evaluation.
Step 306: and evaluating the signal strength value of the object sound mixed signal according to the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio.
Specifically, after the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio of the target object sound signal are obtained, the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio are comprehensively considered, quality evaluation is carried out on the target audio, and the signal intensity level of the whole object sound mixed signal is evaluated according to the quality evaluation. And judging the signal-to-noise ratio result, if the signal-to-noise ratio is lower, indicating that the target audio quality in the mixed signal is poorer, and the signal strength value needs to be improved. Analyzing the frequency coverage condition of the target audio according to the frequency spectrum result, and if the distribution range is narrow, enhancing the signal strength is also required. According to the harmonic distortion ratio result, if the distortion is serious, the signal strength needs to be improved to enhance the target audio. By comprehensively considering the technical characteristic indexes, the overall signal intensity value of the current object sound mixed signal can be estimated, the signal intensity value is obtained by weighting calculation of the signal to noise ratio, the frequency spectrum and the harmonic distortion ratio through historical signal intensity value estimation standards including a first weight corresponding to the signal to noise ratio, a second weight corresponding to the frequency spectrum and a third weight corresponding to the harmonic distortion ratio, and basis is provided for subsequent audio synthesis and effect optimization. The purpose of the mixed signal intensity evaluation is to analyze the quality and effect of the target audio to determine whether the signal intensity needs to be increased later in the mixing process, thereby obtaining a better mixed audio effect.
Based on the above embodiment, as an alternative embodiment, in step 306: the method comprises the following steps of estimating the signal strength value of the object sound mixed signal according to the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio, and the method can further comprise the following steps:
Step 316: and determining a signal intensity difference according to the signal intensity value and the standard signal intensity value of the object sound mixed signal.
Wherein, the signal strength value refers to a technical parameter representing the strength of the audio signal. In the embodiment of the application, the signal intensity value can be understood as a parameter indicating the intensity of the target audio component in the object sound mixed signal obtained by evaluation analysis, and the signal intensity value is used for judging the quality and the obvious degree of the target audio in the mixed signal and evaluating whether intensity enhancement processing is needed to improve the mixed audio effect.
Specifically, a standard audio signal strength value is preset as a target reference value for audio synthesis. According to the obtained actual signal intensity result of the estimated object sound mixed signal, namely the audio signal intensity value, the difference value between the signal intensity of the object sound mixed signal and the standard target value can be calculated by comparing the standard audio signal intensity value and the audio signal intensity value. If the difference is too large, the method indicates that the strength of the object sound mixed signal needs to be improved through subsequent signal adjustment processing, and the difference from the standard is reduced. The purpose of calculating the signal intensity difference is to judge the necessity and amplitude of the audio intensity adjustment, and provide basis and reference for the subsequent signal enhancement processing so as to ensure that the synthesized mixed audio reaches the quality requirement.
Step 326: and determining a transmitting power adjustment parameter corresponding to the signal strength difference according to the power mapping table.
The power mapping table refers to a corresponding relation table between a signal strength difference value and a transmitting power adjustment parameter of the transmitter. In the embodiment of the present application, the power mapping table may be understood as a look-up table preset by the system to determine the transmission power compensation parameter according to the signal strength difference. The power mapping table is obtained by analyzing the mapping relation between the historical signal strength difference and the corresponding historical transmitter transmitting power.
Specifically, a mapping relation table between the signal strength difference value and the transmitting power adjusting parameter is pre-established. After determining the signal strength difference of the current mixed signal, the system searches the transmitting power adjusting parameter corresponding to the difference in the power mapping table. For example, the larger the signal strength difference, the larger the required transmit power adjustment amplitude. And the system determines the currently required transmitting power adjustment value according to the mapping relation. The transmitting power compensation parameter suitable for the current intensity difference value can be automatically obtained by inquiring the mapping table, so that the power of the signal can be adjusted later, and the final mixed audio can reach the standard intensity. The purpose of establishing the mapping relation is to realize the correspondence between the signal strength difference and the power adjustment parameter, and to realize the rapid and automatic acquisition of the parameter adjustment value.
Step 336: and adjusting the transmitter according to the transmission power adjustment parameter.
Specifically, after determining the transmit power adjustment parameter for the current signal strength difference, the system will perform power compensation adjustment on the transmitter according to the parameter to increase the strength level of the target audio in the mixed signal. And inputting and setting the queried transmitting power parameters for compensating the current intensity difference into a power control module of the transmitter. The transmitter correspondingly increases the power intensity during signal transmission according to the adjustment parameter. When the emitted mixed audio signal covers a target area, the intensity of the target audio component is enhanced, so that the mixed signal reaches the standard intensity level requirement, and the purpose of adjusting the emission power is to increase the target audio intensity of the mixed signal by compensating the emission power, so that the mixed signal reaches the expected audio synthesis effect and standard.
Step 103: the spectrum of the object sound signal is determined, and noise is generated based on the spectrum.
Specifically, spectrum analysis is performed on the extracted target object sound signal, and the main frequency components and the distribution condition of the audio signal are determined. And generating noise interference waves in the same frequency range by adopting a noise generator according to the analyzed target audio frequency spectrum characteristics. This noise can cover the main frequency components of the target audio. The generated noise is modulated and synthesized to form a superimposed noise signal with a frequency spectrum similar to the target audio, and the generated noise interference is customized according to the frequency spectrum characteristics of the target audio, so that the transmission of the target audio information can be effectively covered and destroyed, and the audio interference effect with strong pertinence is realized. The purpose of generating targeted noise is to generate noise that can effectively interfere with the current target audio to block the propagation of objectionable audio, and spectral determination provides a basis for generating efficient interference.
Step 104: and superposing the noise and the object sound signal to obtain a target AM signal, and transmitting the target AM signal to a transmitter.
Wherein a transmitter refers to a device for transmitting radio wave signals. In an embodiment of the present application, a transmitter may be understood as a wireless transmitting device in which a system is used to transmit an AM modulated wave containing superimposed noise for target object sound signal synthesis. The transmitter is used for receiving the target AM signal sent by the system and transmitting the target AM signal out to cover the area where the target object sound signal is located, so that the interference on the target audio is realized.
Specifically, after the superposition noise aiming at the current target object sound signal is generated, the system superposes and synthesizes the superposition noise and the target audio to obtain a target AM signal, and the target AM signal is sent to a transmitter for playing, so that the targeted audio interference is realized. And mixing and superposing superposition noise generated for the current target audio content and the extracted target object sound signal according to a certain proportion, modulating and synthesizing an AM modulation wave containing noise optimized for the current target audio, and forming a target AM signal. And controlling the signal transmission of the transmitter, and transmitting the synthesized target AM signal through the transmitter to cover the propagation area of the target audio. Interference destruction of the audio is achieved by transmitting superimposed noise tailored to the targeted audio content, suppressing the propagation of objectionable information within the area.
Based on the above embodiment, as an alternative embodiment, in step 104: the method comprises the steps of superposing noise and a target sound signal to obtain a target AM signal, and transmitting the target AM signal to a transmitter, wherein before the step, the method further comprises the following steps of:
step 401: the target AM signal is converted into an analog audio signal by the DA/AD device.
Specifically, after a digital AM modulation signal generated for a target object sound signal is obtained, the security of signal transmission is ensured, and the digital signal is transmitted to a DA/AD conversion device provided in an intranet to perform digital-to-analog conversion. And transmitting the digital AM modulated wave signal to DA/AD equipment through an intranet secure connection. The DA/AD equipment converts an input digital AM signal into a corresponding analog audio signal form by using a digital-analog conversion device, the converted analog audio signal is continuously transmitted in an intranet, and the converted analog audio signal enters an audio interface of a transmitter to carry out subsequent wireless transmission. Through DA/AD conversion of intranet isolation, the conversion from digital AM signals to analog audio signals is safely realized, so that the input format requirement of a transmitter is met, the object sound signals are prevented from contacting with the external network after being separated, and the safety is improved.
Referring to fig. 2, a source enhancement system for broadcasting audio according to an embodiment of the present application includes: the system comprises an audio acquisition module, a signal processing module, a noise generation module and a signal superposition module, wherein:
The audio acquisition module is used for acquiring the object sound PCM audio of the object transmitter and the PCM audio of the local mixed signal;
the signal processing module is used for determining an object sound mixed signal according to the object sound PCM audio frequency and the PCM audio frequency; determining a target object sound signal according to the object reference sound and the object sound mixed signal;
the noise generation module is used for determining the frequency spectrum of the object sound signal and generating noise according to the frequency spectrum;
and the signal superposition module is used for superposing the noise and the object sound signal to obtain a target AM signal and transmitting the target AM signal to the transmitter.
On the basis of the embodiment, the audio acquisition module is further used for acquiring an original AM signal in the corresponding direction of the object sound transmitter through the directional AM broadcast antenna; converting the original AM signal into object sound PCM audio according to a preset PCM format; the method comprises the steps of collecting original AM signals and background noise signals in all directions through omnidirectional AM broadcast antennas of all monitoring points, taking the original AM signals and the background noise signals as local mixed signals, and converting the local mixed signals into PCM audio in a preset PCM format.
On the basis of the above embodiment, the signal processing module is further configured to obtain a first sampling time of the PCM audio of the object sound and a second sampling time of the PCM audio; and combining the object sound PCM audio and the PCM audio according to the first sampling time and the second sampling time to obtain an object sound mixed signal.
On the basis of the embodiment, the signal processing module is further used for carrying out information source enhancement on the object reference sound to obtain a broadcast enhancement signal; and matching the target object sound signal in the object sound mixed signal according to the frequency characteristic and the time domain characteristic of the broadcast enhancement signal.
On the basis of the above embodiment, the signal processing module further includes obtaining a signal-to-noise ratio, a frequency spectrum and a harmonic distortion ratio of the target object sound signal; and evaluating the signal strength value of the object sound mixed signal according to the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio.
On the basis of the embodiment, the noise generation module further comprises determining a signal intensity difference according to the signal intensity value and the standard signal intensity value of the object sound mixed signal; determining a transmitting power adjustment parameter corresponding to the signal strength difference according to the power mapping table; and adjusting the transmitter according to the transmission power adjustment parameter.
On the basis of the above embodiment, the signal superimposing module further includes converting the target AM signal into an analog audio signal by the DA/AD device.
It should be noted that: in the device provided in the above embodiment, when implementing the functions thereof, only the division of the above functional modules is used as an example, in practical application, the above functional allocation may be implemented by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to implement all or part of the functions described above. In addition, the embodiments of the apparatus and the method provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the embodiments of the method are detailed in the method embodiments, which are not repeated herein.
The application also discloses electronic equipment. Referring to fig. 3, fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. The electronic device 300 may include: at least one processor 301, at least one network interface 304, a user interface 303, a memory 305, at least one communication bus 302.
Wherein the communication bus 302 is used to enable connected communication between these components.
The user interface 303 may include a Display screen (Display) interface and a Camera (Camera) interface, and the optional user interface 303 may further include a standard wired interface and a standard wireless interface.
The network interface 304 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), among others.
Wherein the processor 301 may include one or more processing cores. The processor 301 utilizes various interfaces and lines to connect various portions of the overall server, perform various functions of the server and process data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 305, and invoking data stored in the memory 305. Alternatively, the processor 301 may be implemented in at least one hardware form of digital signal Processing (DIGITAL SIGNAL Processing, DSP), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 301 may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), and a modem, etc. The CPU mainly processes an operating system, a user interface diagram, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 301 and may be implemented by a single chip.
The Memory 305 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 305 includes a non-transitory computer readable medium (non-transitory computer-readable storage medium). Memory 305 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 305 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the above-described respective method embodiments, etc.; the storage data area may store data or the like involved in the above respective method embodiments. Memory 305 may also optionally be at least one storage device located remotely from the aforementioned processor 301. Referring to fig. 3, an operating system, a network communication module, a user interface module, and an application program of a source enhancement method of broadcasting audio may be included in the memory 305 as a computer storage medium.
In the electronic device 300 shown in fig. 3, the user interface 303 is mainly used for providing an input interface for a user, and acquiring data input by the user; and the processor 301 may be configured to invoke an application program in the memory 305 that stores a source enhancement method of broadcast audio, which when executed by the one or more processors 301, causes the electronic device 300 to perform the method as in one or more of the embodiments described above. It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all of the preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as a division of units, merely a division of logic functions, and there may be additional divisions in actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some service interface, device or unit indirect coupling or communication connection, electrical or otherwise.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable memory. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in whole or in part in the form of a software product stored in a memory, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method of the various embodiments of the present application. And the aforementioned memory includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a magnetic disk or an optical disk.
The above are merely exemplary embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure.
This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
Claims (10)
1. A method of source enhancement for broadcast audio, comprising:
Acquiring object sound PCM audio of an object transmitter and PCM audio of a local mixed signal;
determining an object sound mixed signal according to the object sound PCM audio and the PCM audio;
determining a target object sound signal according to the object reference sound and the object sound mixed signal;
determining the frequency spectrum of the object sound signal, and generating noise according to the frequency spectrum;
and superposing the noise and the object sound signal to obtain a target AM signal, and transmitting the target AM signal to a transmitter.
2. The method of claim 1, wherein the acquiring the object tone PCM audio of the object transmitter and the PCM audio of the local mixed signal comprises:
collecting an original AM signal in a direction corresponding to the object sound transmitter through a directional AM broadcasting antenna;
Converting the original AM signal into the object sound PCM audio according to a preset PCM format;
the original AM signal and the background noise signal in all directions are collected through the omnidirectional AM broadcasting antenna of each monitoring point,
And taking the original AM signal and the background noise signal as the local mixed signal, and converting the local mixed signal into the PCM audio in the preset PCM format.
3. The method of claim 1, wherein the determining the object sound mixed signal from the object sound PCM audio and the PCM audio comprises:
acquiring a first sampling time of the object sound PCM audio and a second sampling time of the PCM audio;
and combining the object sound PCM audio and the PCM audio according to the first sampling time and the second sampling time to obtain the object sound mixed signal.
4. The method of claim 1, wherein determining a target object sound signal from an object reference sound and the object sound mixed signal comprises:
performing information source enhancement on the object reference sound to obtain a broadcast enhancement signal;
and matching the target object sound signal in the object sound mixed signal according to the frequency characteristic and the time domain characteristic of the broadcast enhanced signal.
5. The method of claim 1, wherein after determining the target object sound signal according to the object reference sound and the object sound mixed signal, further comprising:
acquiring the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio of the target object sound signal;
and evaluating the signal strength value of the object sound mixed signal according to the signal-to-noise ratio, the frequency spectrum and the harmonic distortion ratio.
6. The method according to claim 5, wherein after evaluating the signal strength value of the object sound mixed signal according to the signal-to-noise ratio, the spectrum, and the harmonic distortion ratio, further comprising:
Determining a signal intensity difference according to the signal intensity value and the standard signal intensity value of the object sound mixed signal;
determining a transmitting power adjustment parameter corresponding to the signal strength difference according to a power mapping table;
and adjusting the transmitter according to the transmission power adjustment parameter.
7. The method of claim 1, wherein prior to transmitting the target AM signal to a transmitter, further comprising:
the target AM signal is converted to an analog audio signal by a DA/AD device.
8. A source enhancement system for broadcasting audio, the system comprising:
The audio acquisition module is used for acquiring the object sound PCM audio of the object transmitter and the PCM audio of the local mixed signal;
The signal processing module is used for determining an object sound mixed signal according to the object sound PCM audio and the PCM audio; determining a target object sound signal according to the object reference sound and the object sound mixed signal;
The noise generation module is used for determining the frequency spectrum of the object sound signal and generating noise according to the frequency spectrum;
And the signal superposition module is used for superposing the noise and the object sound signal to obtain a target AM signal, and transmitting the target AM signal to a transmitter.
9. An electronic device comprising a processor, a memory, a user interface, and a network interface, the memory for storing instructions, the user interface and the network interface for communicating to other devices, the processor for executing the instructions stored in the memory to cause the electronic device to perform the method of source enhancement of broadcast audio according to any one of claims 1-7.
10. A computer readable storage medium storing instructions which, when executed, perform the method steps of source enhancement of broadcast audio according to any one of claims 1-7.
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