CN110989962A - Audio transmission signal maintenance method - Google Patents
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Abstract
The invention discloses an audio transmission signal maintenance method, which solves the problem that audio signals are not matched with a terminal and cannot be played at the terminal due to incomplete interference and no preprocessing, converts the audio by arranging a maintenance terminal, a digital conversion module and an audio processing module, avoids the signal damage and incompleteness of the audio in the transmission process, and ensures that the audio signal has better quality when being transmitted to the terminal by arranging an audio decoding module and a noise detection module, is easier to be matched with the terminal and is more humanized. The device comprises a receiving module, a maintenance terminal, a channel monitoring module, a network communication module, a digital conversion module, an audio processor, an audio decoding module, a bandwidth selection module, a noise detection module, an extraction module and a storage module, wherein the receiving module is connected with the maintenance terminal, and the maintenance terminal is connected with the channel monitoring module.
Description
Technical Field
The invention relates to the technical field of audio transmission, in particular to an audio transmission signal maintenance method.
Background
The audio signal is a regular sound wave frequency and amplitude change information carrier with voice, music and sound effect, and the audio information can be classified into regular audio and irregular sound according to the characteristics of the sound wave. Where regular audio is the familiar speech, music and sound effects. Regular audio is a continuously varying analog signal that can be represented by a continuous curve called a sound wave. Another irregular audio is that, noise and the like, the whole process of speech data processing can be divided into two parts: A/D conversion, namely converting the analog input of the original sound into digital information; d/a conversion, i.e. converting digital information into analog data. High quality low rate speech coding techniques, which convert analog speech signals into digital signals for transmission over a channel, are among the most important requirements. In addition to the requirement for communication bandwidth, the limitation of storage capacity of embedded systems also requires that speech be compressed to meet the goal of real-time or near real-time microprocessor processing with large amounts of data.
The maintenance process of the signals in the audio transmission process is only to simply maintain the audio through the audio processor, so that the environment of the audio signals in the transmission process or the interference of electromagnetism on the audio signals cannot be guaranteed, the complete transmission of the audio signals is not affected, and after the signals are transmitted, the signals cannot be preprocessed according to the requirements of users, so that the audio signals and the terminals are not matched, the audio cannot be played, and therefore the prior art needs to be improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an audio transmission signal maintenance method, which solves the problem that audio signals are not matched with a terminal and cannot be played at the terminal due to incomplete interference and no pretreatment, so that the audio signal transmission effect is better and more humanized.
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides an audio transmission signal maintains system, includes receiving module, maintenance terminal, channel monitoring module, network communication module, digital conversion module, audio processor, audio decoding module, bandwidth selection module, noise detection module, draws module and storage module, receiving module and maintenance terminal are connected, maintain terminal and channel monitoring module and connect, maintain terminal and network communication module and connect, network communication module and digital conversion module are connected, network communication module and audio processor are connected, audio processor and audio decoding module are connected, audio decoding module and bandwidth selection module are connected, audio decoding module and noise detection module are connected, noise detection module and extraction module are connected, extraction module and storage module are connected.
Preferably, the digital conversion module includes a bit right network module, an analog switch module, an operational amplifier and a digital register module, the bit right network module is connected with the digital register module), the analog switch module is connected with the digital register module, and the operational amplifier is connected with the digital register module.
Preferably, the audio processor includes an input module and an output module, the input module is connected to the output module, the input module includes a gain control module, an equalization adjustment module, a delay adjustment module and a polarity conversion module, and the output module includes a routing module, a high-pass filter, a low-pass filter and an equalizer.
Preferably, the audio decoding module comprises a parameter setting module, a signal dividing module, a low-frequency decoding module, a prediction module, a parameter calculation module, a synthesis module, a high-frequency decoding module and a signal merging module, the parameter setting module is connected with the signal dividing module, the signal dividing module is connected with the low-frequency decoding module, the signal dividing module is connected with the high-frequency decoding module, and the low-frequency decoding module is connected with the signal synthesis module.
Preferably, the low-frequency decoding module is connected with the prediction module, the low-frequency decoding module is connected with the parameter calculation module, the parameter calculation module is connected with the synthesis module, the synthesis module is connected with the high-frequency decoding module, and the high-frequency decoding module is connected with the signal synthesis module.
A method for maintaining audio transmission signals comprises the following specific steps:
the method comprises the following steps: the audio signal is received through the receiving module, the receiving module receives the signal and then transmits the signal to the maintenance terminal, the maintenance terminal generates a corresponding instruction according to the received signal and transmits the instruction to the channel monitoring module, and the channel monitoring module receives the instruction, wherein the audio data are sent to the remote equipment through the communication channel and are adjusted based on channel monitoring.
Step two: the maintenance terminal transmits the instruction to the digital conversion module through the network communication module, after the digital conversion module receives the instruction, the bit right network module enables the audio information to generate a current value which is in direct proportion to the bit right on a bit right network, the digital conversion module transmits the numerical information to the digital register module for temporary storage, the analog switch module controls the on-off of a circuit and transmits a control result to the digital register module for temporary storage, the operational amplifier amplifies weak signals and calculates the weak signals, the signals are transmitted to the digital register module for temporary storage after amplification, after the digital conversion module completes the signal conversion, the signals are transmitted to the maintenance terminal through the network communication module, and corresponding instructions are generated according to the audio signals.
Step three: the maintenance terminal transmits the instruction to the audio processing module through the network communication module, after the audio processing module receives the instruction, the gain control module in the input module controls the input level of the processor, the balance adjustment module performs balance adjustment on the parameters, the delay adjustment module delays the input signal of the processor to perform integral delay adjustment, the polarity conversion module converts the polarity phase of the processor between positive and negative, and after the input module finishes adjustment, the instruction is transmitted to the output module.
Step four: after the output module receives the instruction, the routing module enables the output channel to selectively receive the signal from the input channel, the high-pass filter adjusts the lower frequency limit of the output signal, the low-pass filter adjusts the upper frequency limit of the output signal, the equalizer performs equalization adjustment on the parameter, and the output module transmits the processed signal to the audio decoding module.
Step five: the audio decoding module receives the instruction and transmits the instruction to the bandwidth selection module, the bandwidth selection module receives the instruction and adjusts the audio bandwidth parameters according to the instruction and sets at least one threshold of the audio bandwidth switching valve, the audio bandwidth parameters are set by comparing the target data rate with the threshold of the audio bandwidth switching valve, and the bandwidth selection module transmits the instruction to the audio decoding module after the selection is completed.
Step six: the audio decoding module starts decoding the audio signals according to bandwidth selection after receiving the instruction, the parameter setting module sets parameters according to the instruction, the signal dividing module divides the audio signals to be decoded into low-frequency signals and high-frequency signals according to the set parameters, and the low-frequency signals are transmitted to the low-frequency decoding module after the division of the signal dividing module is completed.
Step seven: the low-frequency decoding module receives a low-frequency signal, decodes low-frequency signal parameters to obtain a low-frequency signal, transmits the low-frequency signal to the signal prediction module, the parameter calculation module and the merging module, predicts a high-frequency band excitation signal by using a pitch period after the prediction module receives the signal, transmits the signal to the synthesis module parameter and calculation module to receive the signal after the prediction is finished, calculates a voiced degree factor according to the low-frequency signal parameters, wherein the voiced degree factor is used for representing the degree of voiced characteristic of the high-frequency signal, and transmits the signal to the synthesis module after the calculation is finished.
Step eight: and after receiving the signals, the synthesis module calculates the synthesized excitation signals of the voiced sound degree factor signals according to the high-frequency band excitation signals transmitted by the prediction module and the parameter calculation module, and transmits the signals to the high-frequency decompression module after synthesis.
Step nine: and after the high-frequency signal is obtained, the signal is transmitted to the signal merging module.
Step ten: the signal merging module synthesizes the low-frequency band signal transmitted by the low-frequency decoding module and the high-frequency band signal transmitted by the high-frequency decoding module to obtain a final decoding signal, after the signal is obtained, the audio decoding module transmits the signal to the noise detection module to perform noise detection on the decoded signal, and after the detection is finished, if the signal is not matched with the noise detection module, the information is fed back to the audio processor for repeated operation.
Step eleven: after the noise detection module detects, if the noise detection module accords with the detection result, the extraction module extracts the audio signal and transmits the information to the storage module for storage.
Advantageous effects
The invention provides an audio transmission signal maintenance method, which has the following beneficial effects: this audio transmission signal maintenance method, maintain the transmission course of audio frequency through setting up the maintenance terminal, through setting up digital conversion module and audio processing module, carry out conversion treatment to the audio frequency, avoid the audio frequency in the transmission course signal impaired incomplete, through setting up audio decoding module and noise detection module for audio signal is better when transmitting to the terminal audio signal quality, changes in and matches with the terminal, more has the hommization.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a system diagram of an audio decoding module according to the present invention.
In the figure: 1. a receiving module; 2. maintaining the terminal; 3. a channel monitoring module; 4. a network communication module; 5. a digital conversion module; 6. an audio processor; 7. an audio decoding module; 8. a bandwidth selection module; 9. a noise detection module; 10. an extraction module; 11. a storage module; 51. a bit right network module; 52. an analog switch module; 53. an operational amplifier; 54. a digital register module; 61. an input module; 62. an output module; 611. a gain control module; 612. a balance adjustment module; 613. a delay adjustment module; 614. a polarity conversion module; 621. a routing module; 622. a high-pass filter; 623. a low-pass filter; 624. an equalizer; 71. a parameter setting module; 72. a signal dividing module; 73. a low frequency decoding module; 74. a prediction module; 75. a parameter calculation module; 76. a synthesis module; 77. a high frequency decoding module; 78. and a signal combination module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: an audio transmission signal maintenance system comprises a receiving module 1, a maintenance terminal 2, a channel monitoring module 3, a network communication module 4, a digital conversion module 5, an audio processor 6, an audio decoding module 7, a bandwidth selection module 8, a noise detection module 9, an extraction module 10 and a storage module 11, and is characterized in that: the receiving module 1 is connected with the maintaining terminal 2, corresponding instructions are generated according to received signals, the maintaining terminal 2 is connected with the channel monitoring module 3, audio data are sent to remote equipment through a communication channel, based on channel monitoring adjustment, the maintaining terminal 2 is connected with the network communication module 4, the network communication module 4 is connected with the digital conversion module 5 and converts the audio signals, the network communication module 4 is connected with the audio processor 6 and processes the audio signals, the audio processor 6 is connected with the audio decoding module 7 and decodes the audio signals, the audio decoding module 7 is connected with the bandwidth selection module 8 and adjusts audio bandwidth parameters according to the instructions, the audio decoding module 7 is connected with the noise detection module 9 and detects decoded audio noise, the noise detection module 9 is connected with the extraction module 10 and is used for extracting the audio signals, the extraction module 10 is connected to the storage module 11 for storing the audio signal.
The digital conversion module 5 comprises a bit-right network module 51, an analog switch module 52, an operational amplifier 53 and a digital register module 54, the bit-right network module 51 is connected with the digital register module 54 and is used for temporarily storing data generated during signal conversion, the analog switch module 52 is connected with the digital register module 54, the operational amplifier 53 is connected with the digital register module 54, the audio processor 6 comprises an input module 61 and an output module 62, the input module 61 is connected with the output module 62 and outputs audio signals, the input module 61 comprises a gain control module 611, an equalization adjusting module 612, a delay adjusting module 613 and a polarity conversion module 614, the gain control module 611 controls the input level of the processor, the equalization adjusting module 612 performs equalization adjustment on parameters, the delay adjusting module 613 delays the input signals of the processor to perform integral delay adjustment, the polarity conversion module 614 converts the polarity phase of the processor between positive and negative, the output module 62 includes a routing module 621, a high pass filter 622, a low pass filter 623, and an equalizer 624, the routing module 621 enables the output channel to selectively receive the signal from the input channel, the high pass filter 622 adjusts the lower frequency limit of the output signal, the low pass filter 623 adjusts the upper frequency limit of the output signal, and the equalizer 624 performs equalization adjustment on the parameter.
The audio decoding module 7 comprises a parameter setting module 71, a signal dividing module 72, a low frequency decoding module 73, a prediction module 74, a parameter calculating module 75, a synthesis module 76, a high frequency decoding module 77 and a signal merging module 78, wherein the parameter setting module 71 is connected with the signal dividing module 72, the signal dividing module 72 divides an audio signal to be decoded into a low frequency signal and a high frequency signal according to a set parameter, the signal dividing module 72 is connected with the low frequency decoding module 73 and decodes a low frequency signal parameter to obtain a low frequency signal, the signal dividing module 72 is connected with the high frequency decoding module 77, the high frequency decoding module 77 obtains a high frequency signal according to a synthesis excitation signal and a high frequency decoding parameter transmitted by the synthesis module 76, the low frequency decoding module 73 is connected with the signal synthesis module 78 and merges the high frequency signal and obtains a final decoded signal, the low frequency decoding module 73 is connected with the prediction module 74, the low frequency decoding module 73 is connected with the parameter calculating module 75 for calculating the voiced degree factor, the parameter calculating module 75 is connected with the synthesizing module 76 for synthesizing the excitation signal, the synthesizing module 76 is connected with the high frequency decoding module 77, and the high frequency decoding module 77 is connected with the signal synthesizing module 78.
A method for maintaining audio transmission signals comprises the following specific steps:
the method comprises the following steps: the audio signal is received by the receiving module 1, the receiving module 1 receives the signal and transmits the signal to the maintenance terminal 2, the maintenance terminal 2 generates a corresponding instruction according to the received signal and transmits the instruction to the channel monitoring module 3, and the channel monitoring module 3 receives the instruction, wherein the audio data is transmitted to the remote device through the communication channel and is adjusted based on the channel monitoring.
Step two: the maintenance terminal 2 transmits the instruction to the digital conversion module 5 through the network communication module 4, after the digital conversion module 5 receives the instruction, the bit right network module 51 enables the audio information to generate a current value in proportion to the bit right on the bit right network, and transmits the numerical information to the digital register module 54 for temporary storage, the analog switch module 52 controls the on-off of the circuit, and transmits the control result to the digital register module 54 for temporary storage, the operational amplifier 53 amplifies the weak signal and calculates the weak signal, the signal is transmitted to the digital register module 54 for temporary storage after amplification, after the digital conversion module 5 completes the signal conversion, the signal is transmitted to the maintenance terminal 2 through the network communication module 4, and a corresponding instruction is generated according to the audio signal.
Step three: the maintenance terminal 2 transmits the instruction to the audio processing module 6 through the network communication module 4, after the audio processing module 6 receives the instruction, the gain control module 611 in the input module 61 controls the input level of the processor, the equalization adjustment module 612 performs equalization adjustment on the parameter, the delay adjustment module 613 delays the input signal of the processor to perform integral delay adjustment, the polarity conversion module 614 converts the polarity phase of the processor between positive and negative, and after the adjustment of the input module 61 is completed, the instruction is transmitted to the output module 62.
Step four: after the output module 62 receives the instruction, the routing module 621 enables the output channel to select to receive the signal from the input channel, the high-pass filter 622 adjusts the lower frequency limit of the output signal, the low-pass filter 623 adjusts the upper frequency limit of the output signal, the equalizer 624 performs equalization adjustment on the parameter, and the output module 62 transmits the processed signal to the audio decoding module 7.
Step five: after receiving the instruction, the audio decoding module 7 transmits the instruction to the bandwidth selection module 8, after receiving the instruction, the bandwidth selection module 8 adjusts the audio bandwidth parameter according to the instruction, sets at least one threshold of the audio bandwidth switching valve, sets the audio bandwidth parameter by comparing the target data rate with the threshold of the audio bandwidth switching valve, and after the selection is completed, the bandwidth selection module 8 transmits the instruction to the audio decoding module 7.
Step six: after receiving the instruction, the audio decoding module 7 starts decoding the audio signal according to the bandwidth selection, the parameter setting module 71 sets a parameter according to the instruction, the signal dividing module 72 divides the audio signal to be decoded into a low-frequency signal and a high-frequency signal according to the set parameter, and after the division by the signal dividing module 72 is completed, the low-frequency signal is transmitted to the low-frequency decoding module 73.
Step seven: the low frequency decoding module 73 receives the low frequency signal, decodes the low frequency signal parameters to obtain a low frequency band signal, and transmits the low frequency band signal to the signal prediction module 74, the parameter calculation module 75, and the merging module 78, after the prediction module 74 receives the signal, the high frequency band excitation signal is predicted by using the pitch period, after the prediction is completed, the signal is transmitted to the synthesis module 76 parameter and calculation module 75 to receive the signal, and then calculates a voiced sound degree factor according to the low frequency signal parameters, the voiced sound degree factor is used for indicating the degree of the voiced sound characteristic of the high frequency band signal, and after the calculation is completed, the signal is transmitted to the synthesis module 76.
Step eight: the synthesis module 76 receives the signal, calculates a synthesized excitation signal of the voicing factor signal according to the high-frequency band excitation signal transmitted by the prediction module 74 and the parameter calculation module 75, and transmits the signal to the high-frequency decompression module 77 after synthesis.
Step nine: after the signal dividing module 9 finishes dividing, the high frequency signal is transmitted to the high frequency decoding module 77, the high frequency decoding module 77 obtains the high frequency signal according to the synthesized excitation signal and the high frequency decoding parameter transmitted by the synthesizing module 76, and after the high frequency signal is obtained, the signal is transmitted to the signal combining module 78.
Step ten: the signal combining module 78 combines the low frequency band signal transmitted by the low frequency decoding module 73 with the high frequency band signal transmitted by the high frequency decoding module 77 to obtain a final decoded signal, after obtaining the signal, the audio decoding module 7 transmits the signal to the noise detection module 9 for noise detection of the decoded signal, and after the detection is completed, if the signal is not matched, the information is fed back to the audio processor 6 for repeated operation.
Step eleven: after the noise detection module 9 detects the audio signal, if the audio signal is matched with the noise detection module, the extraction module 10 extracts the audio signal and transmits the information to the storage module 11 for storage.
The invention has the beneficial effects that: according to the audio transmission signal maintenance method, the transmission process of audio is maintained through the setting maintenance terminal 2, the audio is converted through the setting of the digital conversion module 5 and the audio processing module 6, the audio is prevented from being damaged and incomplete in the transmission process, and the audio decoding module 7 and the noise detection module 9 are arranged, so that the quality of the audio signal is better when the audio signal is transmitted to the terminal, the audio signal is easier to match with the terminal, and the method is more humanized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An audio transmission signal maintenance system comprises a receiving module (1), a maintenance terminal (2), a channel monitoring module (3), a network communication module (4), a digital conversion module (5), an audio processor (6), an audio decoding module (7), a bandwidth selection module (8), a noise detection module (9), an extraction module (10) and a storage module (11), and is characterized in that: receiving module (1) and maintenance terminal (2) are connected, maintain terminal (2) and channel monitoring module (3) and connect, maintain terminal (2) and network communication module (4) and connect, network communication module (4) and digital conversion module (5) are connected, network communication module (4) and audio processor (6) are connected, audio processor (6) and audio decoding module (7) are connected, audio decoding module (7) and bandwidth selection module (8) are connected, audio decoding module (7) and noise detection module (9) are connected, noise detection module (9) and extraction module (10) are connected, extraction module (10) and storage module (11) are connected.
2. An audio transmission signal maintenance system according to claim 1, wherein: the digital conversion module (5) comprises a bit right network module (51), an analog switch module (52), an operational amplifier (53) and a digital register module (54), the bit right network module (51) is connected with the digital register module 54, the analog switch module (52) is connected with the digital register module (54), and the operational amplifier (53) is connected with the digital register module (54).
3. An audio transmission signal maintenance system according to claim 1, wherein: the audio processor (6) comprises an input module (61) and an output module (62), wherein the input module (61) is connected with the output module (62), the input module (61) comprises a gain control module (611), an equalization adjusting module (612), a delay adjusting module (613) and a polarity conversion module (614), and the output module (62) comprises a routing module (621), a high-pass filter (622), a low-pass filter (623) and an equalizer (624).
4. An audio transmission signal maintenance system according to claim 1, wherein: the audio decoding module (7) comprises a parameter setting module (71), a signal dividing module (72), a low-frequency decoding module (73), a prediction module (74), a parameter calculating module (75), a synthesis module (76), a high-frequency decoding module (77) and a signal merging module (78), wherein the parameter setting module (71) is connected with the signal dividing module (72), the signal dividing module (72) is connected with the low-frequency decoding module (73), the signal dividing module (72) is connected with the high-frequency decoding module (77), and the low-frequency decoding module (73) is connected with the signal synthesis module (78).
5. An audio transmission signal maintenance system according to claim 4, wherein: the low-frequency decoding module (73) is connected with the prediction module (74), the low-frequency decoding module (73) is connected with the parameter calculation module (75), the parameter calculation module (75) is connected with the synthesis module (76), the synthesis module (76) is connected with the high-frequency decoding module (77), and the high-frequency decoding module (77) is connected with the signal synthesis module (78).
6. A method for maintaining an audio transmission signal, comprising: the method comprises the following specific steps:
the method comprises the following steps: receiving an audio signal through a receiving module (1), transmitting the signal to a maintenance terminal (2) after the receiving module (1) receives the signal, generating a corresponding instruction according to the received signal by the maintenance terminal (2), transmitting the instruction to a channel monitoring module (3), and after receiving the instruction by the channel monitoring module (3), transmitting audio data to a remote device through a communication channel and adjusting based on channel monitoring;
step two: the maintenance terminal (2) transmits the instruction to the digital conversion module (5) through the network communication module (4), after the digital conversion module (5) receives the instruction, the bit right network module (51) enables the audio information to generate a current value which is in direct proportion to the bit right on a bit right network, the digital information is transmitted to the digital register module (54) to be temporarily stored, the analog switch module (52) controls the on-off of a circuit and transmits a control result to the digital register module (54) to be temporarily stored, the operational amplifier (53) amplifies and calculates the weak signal, the signal is transmitted to the digital register module (54) to be temporarily stored after amplification, after the digital conversion module (5) completes the signal conversion, the signal is transmitted to the maintenance terminal (2) through the network communication module (4), and a corresponding instruction is generated according to the audio signal;
step three: the maintenance terminal (2) transmits the instruction to the audio processing module (6) through the network communication module (4), after the audio processing module (6) receives the instruction, the gain control module (611) in the input module (61) controls the input level of the processor, the equalization adjustment module (612) performs equalization adjustment on the parameters, the delay adjustment module (613) delays the input signal of the processor to perform integral delay adjustment, the polarity conversion module (614) converts the polarity phase of the processor between positive and negative, and after the input module (61) is adjusted, the instruction is transmitted to the output module (62);
step four: after the output module (62) receives the instruction, the routing module (621) enables the output channel to select and receive the signal from the input channel, the high-pass filter (622) adjusts the lower frequency limit of the output signal, the low-pass filter (623) adjusts the upper frequency limit of the output signal, the equalizer (624) performs equalization adjustment on the parameter, and the output module (62) transmits the processed signal to the audio decoding module (7);
step five: after receiving the instruction, the audio decoding module (7) transmits the instruction to the bandwidth selection module (8), after receiving the instruction, the bandwidth selection module (8) adjusts audio bandwidth parameters according to the instruction, sets at least one threshold of the audio bandwidth switching valve, sets the audio bandwidth parameters by comparing the target data rate with the threshold of the audio bandwidth switching valve, and after the selection is completed, the bandwidth selection module (8) transmits the instruction to the audio decoding module (7);
step six: after receiving the instruction, the audio decoding module (7) starts to decode the audio signal according to the bandwidth selection, the parameter setting module (71) sets parameters according to the instruction, the signal dividing module (72) divides the audio signal to be decoded into a low-frequency signal and a high-frequency signal according to the set parameters, and after the division of the signal dividing module (72) is completed, the low-frequency signal is transmitted to the low-frequency decoding module (73);
step seven: after receiving the low-frequency signal, a low-frequency decoding module (73) decodes low-frequency signal parameters to obtain a low-frequency band signal, and transmits the low-frequency band signal to a signal prediction module (74), a parameter calculation module (75) and a merging module (78), wherein after receiving the signal, the prediction module (74) predicts a high-frequency band excitation signal by using a pitch period, after the prediction is finished, the signal is transmitted to a synthesis module (76) parameter and calculation module (75) to receive the signal, a voiced degree factor is calculated according to the low-frequency signal parameters, the voiced degree factor is used for indicating the degree of voiced characteristic of the high-frequency band signal, and after the calculation is finished, the signal is transmitted to the synthesis module (76);
step eight: after receiving the signals, the synthesis module (76) calculates the synthesized excitation signals of the voiced degree factor signals according to the high-frequency band excitation signals transmitted by the prediction module (74) and the parameter calculation module (75), and transmits the signals to the high-frequency decompression module (77) after the synthesis is finished;
step nine: after the signal dividing module (9) divides the signals, the high-frequency signals are transmitted to a high-frequency decoding module (77), the high-frequency decoding module (77) obtains the high-frequency signals according to the synthesized excitation signals and the high-frequency decoding parameters transmitted by the synthesizing module (76), and after the high-frequency signals are obtained, the signals are transmitted to a signal combining module (78);
step ten: the signal merging module (78) synthesizes the low-frequency band signal transmitted by the low-frequency decoding module (73) and the high-frequency band signal transmitted by the high-frequency decoding module (77) to obtain a final decoding signal, after the signal is obtained, the audio decoding module (7) transmits the signal to the noise detection module (9) for noise detection of the decoded signal, and after the detection is finished, if the signal is not matched with the noise detection module, the information is fed back to the audio processor (6) for repeated operation;
step eleven: after the noise detection module (9) finishes detection, if the noise detection module accords with the detection result, the extraction module (10) extracts the audio signal and transmits the information to the storage module (11) for storage.
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