CN107277683B - Audio amplification system and method - Google Patents
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Abstract
The invention discloses an audio amplification system and a method, wherein the audio amplification system comprises an audio amplification device and audio playing equipment; the audio playing device outputs audio signals to the audio amplifying device, the audio amplifying device comprises a singlechip and digital signal processor module, a DSP digital power amplifying module and a signal acquisition module, and the singlechip and digital signal processor module is used for carrying out analog-to-digital conversion and channel selection on the input audio signals and outputting the audio signals to the DSP digital power amplifying module; the DSP digital power amplification module is used for performing sound effect processing on an input audio signal and outputting the audio signal after power amplification, and the signal acquisition module is used for sampling the transient signal amplitude of the signal output by the DSP digital power amplification module and outputting the sampling result to the singlechip and digital signal processor module. The audio amplifying system and the method can solve the problem of sound box distortion caused by different audio formats of the existing audio playing equipment such as an internet audio terminal, a tablet personal computer and the like.
Description
Technical Field
The invention relates to the technical field of electronic products and the Internet, in particular to an audio amplification system and method.
Background
The rapid growth of internet technology, the popularization of technologies such as cloud music, cloud voice service and the like, the traditional single sound source type becomes complicated and diversified, and the audio of terminal products such as internet music, smart phones, smart home, tablet personal computers, internet of vehicles, intelligent wearing and the like gradually becomes mainstream. The output audio source amplitude and dynamic difference are very large because of the large number of encoding formats of the program source. The sound box in the prior art cannot be well matched with the sound box in the prior art, particularly when the sound is relatively large, the sound box has truncated distortion, such as the sound box adopting the dynamic compression DRC technology in the prior art, the dynamic of the sound box is compressed although the truncated distortion can be reduced, and the sound quality of the sound box is poor.
In the prior art, due to the rapid development of the internet technology, different types of sound sources become complicated and diversified, the output amplitude and the dynamic difference of the audio frequency are very large, while the sound box of the dynamic compression technology in the prior art adopts a method for detecting the peak value of a signal in a transient state, and the gain and the volume of a power amplifier are adjusted to reduce the shaving distortion based on the method, but delay of sound and dynamic compression are brought, so that the music cannot be truly restored. Cannot adapt to the Internet age which is rapidly developed nowadays.
Disclosure of Invention
In order to overcome all the defects of the existing related products, the invention provides an audio amplifying system and an audio amplifying method, and aims to solve the problem of sound box distortion caused by different audio formats of the existing audio playing equipment such as an internet audio terminal, an electric smart phone, a tablet personal computer and the like.
The technical scheme adopted for solving the technical problems is as follows:
the invention provides an audio amplification system and method, comprising the following steps: an audio amplifying device and an audio playing device; the audio playing device outputs audio signals to an audio amplifying device, and the audio amplifying device comprises a singlechip and digital signal processor module, a DSP digital power amplifier module and a signal acquisition module; the singlechip and digital signal processor module is used for carrying out analog-to-digital conversion and channel selection on an input audio signal and outputting the audio signal to the DSP digital power amplifier module; the DSP digital power amplifier module is used for performing sound effect processing on an input audio signal and outputting the audio signal after power amplification, the signal acquisition module is used for sampling transient signal amplitude of the signal output by the DSP digital power amplifier module and outputting a sampling result to the singlechip and digital signal processor module, the singlechip and digital signal processor module judges whether the average amplitude of the signal exceeds a preset value according to the sampling result of the input audio signal and the signal acquisition module, and if the average amplitude of the signal exceeds the preset value, the DSP digital power amplifier module is controlled to start automatic gain control, and the volume attenuator is adjusted to proper output power and then output.
The audio amplifying device further comprises an analog signal input module and a digital signal input module, wherein the analog signal input module and the digital signal input module are respectively connected with the audio playing device and the singlechip and the digital signal processor module and are used for receiving an audio signal output by the audio playing device, respectively carrying out channel isolation and signal buffering on the audio signal and then outputting the audio signal to the singlechip and the digital signal processor module.
As a further improvement of the invention, the singlechip and the digital signal processor module respectively receive front-end input signals from the analog signal input module and the digital signal input module, and transient signal amplitude acquired by the signal acquisition module, judge whether the transient signal amplitude exceeds a preset value according to the front-end input signals, and if the transient signal amplitude does not exceed the preset value, control the DSP digital power amplification module to adjust the frequency response of the signals and directly output the signals after amplification; if the transient signal amplitude exceeds the preset value, taking the average value of the transient signal amplitude corresponding to the front-end input signal and the transient signal amplitude sampled by the signal acquisition module, judging whether the signal average amplitude exceeds the preset value according to a programmable single-chip microcomputer average value algorithm, and if the signal average amplitude does not exceed the preset value, controlling the DSP digital power amplification module to adjust the frequency response and amplify the signal and then directly outputting the signal; and if the average amplitude of the signal exceeds a preset value and reaches a preset duration, transmitting a serial control instruction to control the DSP digital power amplifier module to perform automatic gain processing on the signal.
As a further improvement of the invention, the DSP digital power amplifier module comprises a sampling automatic detecting unit, a serial control unit, a programmable control unit and a digital power amplifier unit, wherein the automatic detecting unit and the serial control unit are respectively connected with the programmable control unit, and the programmable control unit is connected with the digital power amplifier unit; the automatic sampling detection unit samples the received audio signal and outputs the audio signal to the programmable control unit, the programmable control unit processes the audio signal and outputs the audio signal to the digital power amplification unit, and the serial control unit is used for controlling the digital power amplification unit to gain the audio signal to a proper volume according to the serial control instruction sent by the singlechip and the digital signal processor module (103) and then outputting the audio signal.
As a further improvement of the invention, the audio amplifying device also comprises a filter module and a loudspeaker module, wherein the filter module is respectively connected with the output end of the DSP digital power amplifying module and the loudspeaker module and is used for filtering and smoothing pulse width modulation waves output by the digital power amplifying unit and outputting the pulse width modulation waves to the loudspeaker module; the loudspeaker module is used for receiving the audio signal, converting the electric energy signal into sound energy and outputting the sound energy.
As a further improvement of the invention, the audio amplifying device also comprises a bias voltage module, one end of the bias voltage module is grounded, and the other end of the bias voltage module is connected with the loudspeaker module, so that bias voltage is applied between the negative stage of the loudspeaker module and the ground, and starting-up impact sound generated by direct current voltage difference between two output ends of the DSP digital power amplifying module is reduced when the loudspeaker module is switched on and off, so that signals are output to the loudspeaker module in high fidelity.
As a further improvement of the invention, the audio amplifying device comprises a sound box, a smart home, a television sound stick, a smart wearable product or a wireless sound box, and the audio playing device comprises a sound box, a household appliance interconnection, a communication device, a mobile phone, a tablet computer or a PC.
An audio amplification method comprising the steps of:
step a: the input audio signal is subjected to analog-digital conversion and channel selection through the singlechip and the digital signal processor module and then is output to the DSP digital power amplifier module;
step b: the DSP digital power amplification module is used for performing sound effect processing on the input audio signals and outputting the audio signals after power amplification;
step c: the signal acquisition module is used for sampling transient signal amplitude of signals output by the DSP digital power amplification module and outputting sampling results to the singlechip and digital signal processor module;
step d: and judging whether the average amplitude of the signal exceeds a preset value or not according to the input audio signal and the sampling result of the signal acquisition module by the singlechip and the digital signal processor module, and if the average amplitude of the signal exceeds the preset value, controlling the DSP digital power amplifier module to start automatic gain control, and outputting after adjusting the volume attenuator to a proper output power.
As a further improvement of the present invention, in the step d, the specific judging mode for judging whether the average amplitude of the signal exceeds the preset value according to the input audio signal and the sampling result of the signal acquisition module by the single chip microcomputer and the digital signal processor module is as follows: the singlechip and the digital signal processor module judge whether the transient signal amplitude exceeds a preset value according to the input audio signal, and if the transient signal amplitude does not exceed the preset value, the DSP digital power amplifier module is controlled to adjust the frequency response and amplify the signal and then directly output the signal; if the transient signal amplitude exceeds the preset value, taking the average value of the transient signal amplitude corresponding to the front-end input signal and the transient signal amplitude sampled by the signal acquisition module, judging whether the signal average amplitude exceeds the preset value according to a programmable single-chip microcomputer average value algorithm, and if the signal average amplitude does not exceed the preset value, controlling the DSP digital power amplification module to adjust the frequency response and amplify the signal and then directly outputting the signal; if the average amplitude of the signal exceeds a preset value and reaches a preset duration, a serial control instruction is sent by the serial control unit to control the digital power amplifier unit to start automatic gain control, and the volume attenuator is adjusted to a proper output power and then output.
As a further improvement of the present invention, the step d further includes: the filter module is used for filtering and smoothing the audio signals output by the DSP digital power amplifier module and outputting the audio signals to the loudspeaker module; the loudspeaker module is used for receiving the audio signal, converting the electric energy signal into sound energy and outputting the sound energy.
Compared with the prior art, the invention has the following advantages:
1. the audio amplifying system of the invention automatically detects the amplitude and the time period of transient signals, adds the voltage value fed back to the digital acquisition module by the digital power amplifier, calculates the average value by the MCU and the DSP module, and when the transient amplitude exceeds the preset threshold voltage, the singlechip sends a serial control instruction according to the judging result to start automatic adjustment of gain, frequency response and volume so as to reduce output distortion.
2. The audio amplifying device has a control module matched with the audio amplifying device, and the audio playing device provided with the control module can ensure that the self-adaptive low-distortion audio amplifying terminal connected with the audio amplifying device can keep low-distortion, low-noise and high-fidelity output which is not compressed dynamically, is suitable for various encoding formats and network music formats with uneven amplitude, and greatly improves the tone quality of an audio system even though the amplitude of an input signal is too large or too small, regardless of the fact that the audio playing device connected with the audio amplifying device is connected with the audio playing device.
Drawings
Fig. 1 is a schematic structural diagram of an audio amplifying system according to an embodiment of the present invention;
fig. 2 is a flowchart of an audio amplifying method according to an embodiment of the present invention.
Reference numerals: 100-an audio amplifying device; 101-an analog signal input module; 102-a digital signal input module; 103-a singlechip and a digital signal processor module; 104-a Digital Signal Processor (DSP) digital power amplifier module; a 105-filter module; 106-a bias voltage module; 107-a speaker module; 108-a signal acquisition module; 200-an audio playing device; 201-a control module; 1041-a sampling auto-detection unit; 1042-a serial control unit; 1043-a programmable control unit; 1044-digital power amplifier unit.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, the audio amplifying system includes an audio amplifying apparatus 100 and an audio playing device 200; the audio playing device 200 outputs an audio signal to the audio amplifying device 100, and the audio amplifying device 100 performs adaptive and low-distortion amplification processing on the received audio signal and outputs the audio signal; the audio amplifying device 100 includes an analog signal input module 101, a digital signal input module 102, a single chip microcomputer and digital signal processor module 103, a DSP digital power amplifier module 104, a filter module 105, a bias voltage module 106, a speaker module 107, and a signal acquisition module 108.
The analog signal input module 101, the digital signal input module 102, the audio playing device 200 and the single-chip microcomputer are respectively connected with the digital signal processor module 103, and are used for receiving the audio signal output by the audio playing device 200, calculating the voltage amplitude after high-precision calculation or analog-to-digital conversion in the MCU, and respectively carrying out channel isolation and signal buffering on the audio signal and then outputting the audio signal to the single-chip microcomputer and the digital signal processor module 103; the singlechip and digital signal processor module 103 is connected with the DSP digital power amplifier module 104 and is used for carrying out analog-to-digital conversion and channel selection on an input audio signal and outputting the audio signal to the DSP digital power amplifier module 104; the DSP digital power amplifier module 104 is connected with the filter module 105, and is configured to perform audio processing on an input audio signal, and output the audio signal to the filter module 105 for filtering processing after power amplification.
The DSP digital power amplifier module 104 includes a sampling auto-detection unit 1041, a serial control unit 1042, a programmable control unit 1043, and a digital power amplifier unit 1044; the automatic detection unit 1041 and the serial control unit 1042 are respectively connected with a programmable control unit 1043, and the programmable control unit 1043 is connected with a digital power amplification unit 1044; the audio signal output by the singlechip and digital signal processor module 103 is sampled by a sampling automatic detection unit 1041 in the DSP digital power amplifier module 104, the transient amplitude of the signal is tracked by an internal high-precision phase-locked loop, the frequency and the phase of an internal oscillation signal of the loop are controlled by using an external input reference signal, the transient input signal amplitude is detected and output to a programmable control unit 1043, the programmable control unit 1043 carries out sound effect processing on the signal and then outputs the signal to a digital power amplifier unit 1044, and a serial control unit 1042 is connected with the singlechip and digital signal processor module 103 and is used for controlling the digital power amplifier unit 1044 to gain the audio signal to a proper volume and then outputting the audio signal to the filter module 105. The sampling automatic detecting unit 1041 is further configured to determine whether the signal amplitude is smaller than a preset threshold, and if the signal amplitude is smaller than the preset threshold, serially control the analog signal input module 101 and the digital signal input module 102 to enter a power saving mode through the singlechip and the digital signal processor module 103, so as to reduce noise and save energy consumption.
The filter module 105 is connected to the speaker module 107, and is used for filtering and smoothing the audio signal output by the digital power amplification unit 1044, filtering out PWM (pulse width modulation) carrier wave and high-frequency clutter, and leaving a useful signal to output to the speaker module 107 for restoring the sound field.
The speaker module 107 is configured to convert the electrical energy signal into acoustic energy output. The signal acquisition module 108 is respectively connected with the filter module 105 and the singlechip and the digital signal processor module 103, and is used for sampling the transient signal amplitude of the output signal of the filter module 105, and outputting the sampling result to the singlechip and the digital signal processor module 103 for further processing after analog-to-digital conversion.
One end of the bias voltage module 106 is grounded, the other end of the bias voltage module 106 is connected with the speaker module 107, the bias voltage module 106 applies bias voltage between the negative level of the speaker module 107 and the ground, and startup impact sound generated by direct current voltage difference between the two output ends of the DSP digital power amplifier module 104 is reduced when the speaker module 107 is switched on and off, so that signals can be output to the speaker module 107 with high fidelity.
The single chip microcomputer and the digital signal processor module 103 respectively receive front-end input signals from the analog signal input module 101 and the digital signal input module 102, and the signal acquisition module 108 acquires transient signal amplitude of signals output by the filter module 105 at a later stage, the front-end input signals are shaped and filtered through the internal analog-digital conversion of the single chip microcomputer and the digital signal processor 103, compared with the internal reference voltage, the ratio of the transient signal amplitude to the reference voltage is converted into digital signals through programming software, whether the transient signal amplitude exceeds a preset value or not is judged, and if the transient signal amplitude does not exceed the preset value, the DSP digital power amplification module 104 is controlled to adjust frequency response and amplify the signals and then directly output the signals; if the transient signal amplitude exceeds the preset value, taking the average value of the transient signal amplitude corresponding to the front-end input signal and the transient signal amplitude sampled by the signal acquisition module 108, judging whether the signal average amplitude exceeds the preset value according to a programmable single-chip microcomputer average value algorithm, and if the signal average amplitude does not exceed the preset value, controlling the DSP digital power amplification module 104 to adjust the frequency response and amplify the signal and then directly outputting the signal; if the average amplitude of the signal exceeds the preset value and reaches the preset duration, the serial control unit 1042 sends a serial control command to control the digital power amplifier unit 1044 to start automatic gain control, adjust the volume attenuator to proper output power and output, so as to achieve the purpose of automatically adapting to low distortion of the environment, and prevent the distortion and protect the speaker module 107 from being damaged.
When the average amplitude of the signal exceeds a preset value, the singlechip and digital signal processor module 103 sends a serial control instruction to control the digital power amplification unit 1044 to start the automatic gain control and volume attenuator through the serial control unit 1042, and when the average amplitude of the signal returns to the preset value, the singlechip and digital signal processor module 103 sends a serial control instruction to control the digital power amplification unit 1044 to recover the unattenuated state through the serial control unit 1042, so that the audio dynamics is ensured not to be compressed.
The audio amplifier device 100 may be a speaker, smart home, television wand, smart wearable product, or wireless speaker.
The audio playing device 200 may be a sound device, a home appliance interconnection, a communication device, a mobile phone, a tablet computer or a PC, and the audio signal output by the audio playing device 200 includes a wireless wifi signal.
The audio playing device 200 includes a control module 201, the control module 201 is matched with the audio amplifying device 100, and can realize the function of synchronously adjusting the equalizer, the volume or playing network music of the audio amplifying device 100 through wireless connection, so that the audio amplifying device 100 connected with the control module 201 can keep low distortion, low noise and high fidelity output with uncompressed dynamics no matter the amplitude of the input audio signal is too large or too small, the audio playing device is suitable for various encoding formats and network music formats with uneven amplitude, and the tone quality of an audio system is greatly improved.
Referring to fig. 2, the audio amplifying method includes the following steps:
s1: the analog signal input module 101 and the digital signal input module 102 receive audio signals and input the audio signals to the singlechip and the digital signal processor module 103 after channel isolation and signal buffering;
s2: after receiving the front-end input signal, the single-chip microcomputer and digital signal processor module 103 performs channel selection, analog-to-digital conversion and frequency response adjustment on the front-end input signal, judges whether the transient signal amplitude of the front-end input signal exceeds a preset value, and if the transient signal amplitude of the front-end input signal does not exceed the preset value, executes step S3; if the transient signal amplitude of the input signal exceeds the preset value, executing step S6;
s3: the audio signal is output to the DSP digital power amplifier module 104, and the digital signal processor module 103 controls the DSP digital power amplifier module 104 to adjust the frequency response and amplify the signal and then directly output the signal;
s4: the filter module 105 performs filtering smoothing processing on the audio signal output by the DSP digital power amplifier module 104, filters the PWM carrier wave and the high-frequency clutter, outputs the filtered PWM carrier wave and the filtered high-frequency clutter to the speaker module 107, and performs step S5 and step S8 respectively;
s5: the signal acquisition module 108 samples transient signal amplitude of the output signal of the filter module 105 and outputs a sampling result to the singlechip and digital signal processor module 103;
s6: the digital signal processor module 103 takes the average value of the transient signal amplitude corresponding to the front-end input signal and the transient signal amplitude sampled by the signal acquisition module 108, judges whether the signal average amplitude exceeds a preset value according to a programmable single-chip microcomputer average value algorithm, and if the signal average amplitude does not exceed the preset value, executes the step S3; if the average amplitude of the signal exceeds the preset value and reaches the preset duration, executing step S7;
s7: the digital signal processor module 103 sends a serial control instruction through the serial control unit 1042 to control the digital power amplification unit 1044 to start automatic gain control, adjusts the volume attenuator to a proper output power and then outputs the volume attenuator, and executes step S4;
s8: the speaker module 107 receives the audio signal, converts the electrical energy signal into acoustic energy, and outputs the acoustic energy, thereby realizing low-distortion and large-dynamic sound effects.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (8)
1. An audio amplification system, comprising: an audio amplifying device (100) and an audio playing device (200), the audio playing device (200) outputting an audio signal to the audio amplifying device (100);
the audio amplifying device (100) comprises an analog signal input module (101), a digital signal input module (102), a singlechip and digital signal processor module (103), a DSP digital power amplifying module (104) and a signal acquisition module (108);
the analog signal input module (101) and the digital signal input module (102) are respectively connected with the audio playing device (200) and the singlechip and the digital signal processor module (103) and are used for receiving the audio signals output by the audio playing device (200), respectively carrying out channel isolation and signal buffering on the audio signals and then outputting the audio signals to the singlechip and the digital signal processor module (103); the singlechip and digital signal processor module (103) is used for carrying out analog-to-digital conversion and channel selection on an input audio signal and outputting the audio signal to the DSP digital power amplifier module (104); the DSP digital power amplification module (104) is used for performing sound effect processing on an input audio signal, outputting the audio signal after power amplification, and the signal acquisition module (108) is used for sampling the transient signal amplitude of the signal output by the DSP digital power amplification module (104) and outputting the sampling result to the singlechip and digital signal processor module (103);
the singlechip and the digital signal processor module (103) respectively receive front-end input signals from the analog signal input module (101) and the digital signal input module (102), and transient signal amplitude acquired by the signal acquisition module (108), judge whether the transient signal amplitude exceeds a preset value according to the front-end input signals, and if the transient signal amplitude does not exceed the preset value, control the DSP digital power amplification module (104) to adjust frequency response and amplify the signals and then directly output the signals; if the transient signal amplitude exceeds the preset value, taking the average value of the transient signal amplitude corresponding to the front-end input signal and the transient signal amplitude sampled by the signal acquisition module (108), judging whether the signal average amplitude exceeds the preset value according to a programmable single-chip microcomputer average value algorithm, and if the signal average amplitude does not exceed the preset value, controlling the DSP digital power amplification module (104) to adjust the frequency response and amplify the signal and then directly outputting the signal; if the average amplitude of the signal exceeds a preset value and reaches a preset duration, a serial control instruction is sent to control the DSP digital power amplifier module (104) to perform automatic gain processing on the signal, and the signal is output after the volume attenuator is adjusted to a proper output power.
2. The audio amplification system of claim 1, wherein: the DSP digital power amplifier module (104) comprises a sampling automatic detection unit (1041), a serial control unit (1042), a programmable control unit (1043) and a digital power amplifier unit (1044), wherein the sampling automatic detection unit (1041) and the serial control unit (1042) are respectively connected with the programmable control unit (1043), and the programmable control unit (1043) is connected with the digital power amplifier unit (1044); the sampling automatic detection unit (1041) samples the received audio signal and outputs the audio signal to the programmable control unit (1043), the programmable control unit (1043) processes the audio signal and outputs the audio signal to the digital power amplification unit (1044), and the serial control unit (1042) is used for controlling the digital power amplification unit (1044) to gain the audio signal to a proper volume according to the serial control instruction sent by the singlechip and the digital signal processor module (103) and then outputting the audio signal.
3. The audio amplification system of claim 2, wherein: the audio amplifying device (100) further comprises a filter module (105) and a loudspeaker module (107), wherein the filter module (105) is respectively connected with the output end of the DSP digital power amplifying module (104) and the loudspeaker module (107) and is used for filtering and smoothing an audio signal output by the digital power amplifying unit (1044) and outputting the audio signal to the loudspeaker module (107); the loudspeaker module (107) is used for receiving the audio signal, converting the electric energy signal into sound energy and outputting the sound energy.
4. An audio amplification system as claimed in claim 3, wherein: the audio amplifying device (100) further comprises a bias voltage module (106), one end of the bias voltage module (106) is grounded, the other end of the bias voltage module is connected with the loudspeaker module (107) and is used for applying bias voltage between the negative stage of the loudspeaker module (107) and the ground, so that starting-up impact sound generated by direct current voltage difference between two output ends of the DSP digital power amplifying module (104) occurs when the loudspeaker module (107) is switched on and off, and signals are output to the loudspeaker module (107) in high fidelity.
5. The audio amplification system of claim 1, wherein: the audio frequency amplifying device (100) comprises a sound box, an intelligent home, a television sound bar, an intelligent wearing product or a wireless sound box, and the audio frequency playing equipment (200) comprises a sound box, household appliance interconnection, communication equipment, a mobile phone, a tablet personal computer or a PC.
6. An audio amplification method, characterized in that: the method comprises the following steps:
step a: the analog signal input module (101) and the digital signal input module (102) receive audio signals, input the audio signals to the singlechip and digital signal processor module (103) after channel isolation and signal buffering, and output the audio signals to the DSP digital power amplifier module (104) after the singlechip and digital signal processor module (103) perform analog-to-digital conversion and channel selection on the input audio signals;
step b: the DSP digital power amplification module (104) is used for performing sound effect processing on the input audio signal and outputting the audio signal after power amplification;
step c: the signal acquisition module (108) is used for sampling the transient signal amplitude of the output signal of the DSP digital power amplification module (104) and outputting the sampling result to the singlechip and digital signal processor module (103);
step d: the singlechip and digital signal processor module (103) judges whether the amplitude of the transient signal exceeds a preset value according to the input audio signal, and if the amplitude of the transient signal does not exceed the preset value, the DSP digital power amplifier module (104) is controlled to adjust the frequency response and amplify the signal and then directly output the signal; if the transient signal amplitude exceeds the preset value, taking the average value of the transient signal amplitude corresponding to the front-end input signal and the transient signal amplitude sampled by the signal acquisition module (108), judging whether the signal average amplitude exceeds the preset value according to a programmable single-chip microcomputer average value algorithm, and if the signal average amplitude does not exceed the preset value, controlling the DSP digital power amplification module (104) to adjust the frequency response and amplify the signal and then directly outputting the signal; if the average amplitude of the signal exceeds a preset value and reaches a preset duration, a serial control instruction is sent to control the DSP digital power amplifier module (104) to perform automatic gain processing on the signal, and the signal is output after the volume attenuator is adjusted to a proper output power.
7. The audio amplification method of claim 6, wherein: in the step d, if the average amplitude of the signal exceeds a preset value and reaches a preset duration, the step of sending a serial control instruction to control the DSP digital power amplifier module (104) to perform automatic gain processing on the signal comprises the following steps:
if the average amplitude of the signal exceeds a preset value and reaches a preset duration, a serial control instruction is sent by a serial control unit (1042) to control a digital power amplification unit (1044) to start automatic gain control, and the automatic gain control is carried out after the volume attenuator is adjusted to a proper output power.
8. The audio amplification method of claim 7, wherein: the step d further comprises the following steps: the audio signal output by the DSP digital power amplifier module (104) is filtered and smoothed by the filter module (105) and then output to the loudspeaker module (107); the loudspeaker module (107) is used for receiving the audio signal, converting the electric energy signal into sound energy and outputting the sound energy.
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| CN110212871B (en) * | 2019-06-12 | 2022-03-22 | 上海艾为电子技术股份有限公司 | Audio power amplifier and gain control circuit and control method thereof |
| CN110662142A (en) * | 2019-09-29 | 2020-01-07 | 惠州市杰德创新科技有限公司 | Loudness adjustment method of loudspeaker and loudspeaker |
| CN112911460A (en) * | 2019-11-19 | 2021-06-04 | 炬芯科技股份有限公司 | Sound box and sound effect control method and sound effect control system thereof |
| CN113852893B (en) * | 2020-06-28 | 2024-11-05 | 北京小米移动软件有限公司 | Data processing method and device, terminal and storage medium |
| CN112532186B (en) * | 2020-11-04 | 2024-03-08 | 杭州爱华仪器有限公司 | Measurement amplifier for measuring audio signals |
| CN113347533A (en) * | 2021-05-14 | 2021-09-03 | 深圳市海创嘉科技有限公司 | Integrated circuit board and stereo set for stereo set based on singlechip secondary development |
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