CN111681664A - Method, system, storage medium and equipment for reducing audio coding rate - Google Patents
Method, system, storage medium and equipment for reducing audio coding rate Download PDFInfo
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/18—Vocoders using multiple modes
- G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/012—Comfort noise or silence coding
Abstract
The application discloses a method, a system, a storage medium and equipment for reducing audio coding rate, and belongs to the technical field of audio coding. The method for reducing the audio coding rate comprises the following steps: judging whether the coded audio frame is a mute frame or not; when the coded audio frame is a mute frame, setting a first coding rate according to the sampling rate and the frame length of the coded audio; when the coded audio frame is a non-mute frame except the mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate; and coding the coded audio frame according to the first coding rate or the second coding rate. The application of this application makes the silence frame to use lower encoding rate to encode in the coding audio frame, reduces the encoding rate of encoder, saves the used coding bandwidth of encoder, reduces the operand, reduces the consumption of encoder, prolongs the live time of encoder, promotes the performance of encoder.
Description
Technical Field
The present application relates to the field of audio coding technologies, and in particular, to a method, a system, a storage medium, and an apparatus for reducing an audio coding rate.
Background
In the prior art, the mainstream bluetooth audio encoder includes: the SBC audio encoder is most widely used according to the mandatory requirements of an A2DP protocol, and is supported by all Bluetooth audio equipment, but the tone quality is general; the AAC-LC audio encoder has good tone quality and wide application range, is supported by a plurality of mainstream mobile phones, but has larger memory occupation and high operation complexity compared with the SBC audio encoder, and a plurality of Bluetooth devices are based on an embedded platform, so that the battery capacity is limited, the operation capability of a processor is poor and the memory is limited; the aptX series audio coder has good sound quality but high code rate, wherein the aptX needs the code rate of 384kbps, and the code rate of the aptX-HD is 576kbps, is a unique technology of high pass, and is relatively closed; LDAC audio frequency encoder, its tone quality is better, but the code rate is also very high, 330kbps, 660kbps and 990kbps respectively, because the wireless environment that bluetooth equipment is located is very complicated, and stable support such high code rate has certain difficulty, and is the unique technique of sony, and is also very closed.
For the above reasons, the Bluetooth international association Bluetooth Sig has introduced the LC3 audio encoder by combining with many manufacturers, which has the advantages of low delay, high sound quality, high coding gain, no special fee in the Bluetooth field, and the like, and is paid attention by the manufacturers. Since the LC3 audio encoder was originally proposed to satisfy the audio application in the bluetooth low energy domain, the power consumption requirement is very strict.
In the LC3 audio encoder, since it is based on the waveform coding technique, the compression efficiency is low compared to the conventional vocoder. For example, the recommended code rate of LC3 at 8k is 24kbps, but the maximum AMR-NB code rate for WCDMA is only 12.2kbps, the average code rate is below 10kbps, the maximum EVRC-A code rate for CDMA is 8kbps, and the average code rate is about 5 kbps. The LC3 audio encoder occupies a larger bandwidth due to a higher code rate, and therefore requires a higher transmission power, and in a public place with more bluetooth devices, mutual interference occurs among the bluetooth devices, which affects user experience.
In addition, when the encoder is used for encoding and decoding in the call process, according to statistics, a call party usually has only 35% of the time for calling, and a mute state exists for a long time. When the existing audio encoder carries out call encoding and decoding, the encoding and decoding processes are carried out according to the fixed code rate, so that the encoder still uses the same code rate for encoding when a call party is in a silent state of no speaking, the waste of the code rate is caused, more bandwidth resources are occupied, and the power consumption of the encoder is increased.
Disclosure of Invention
In view of the above technical problems in the prior art, the present application provides a method, a system, a storage medium, and a device for reducing an audio coding rate.
In one technical solution of the present application, a method for reducing an audio coding rate is provided, including determining whether an encoded audio frame is a silence frame; when the coded audio frame is a mute frame, setting a first coding rate according to the sampling rate and the frame length of the coded audio; when the coded audio frame is a non-mute frame except a mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate; and coding the coded audio frame according to the first coding rate or the second coding rate.
In another technical solution of the present application, a system for reducing an audio coding rate is provided, which includes a silence frame determining module that determines whether an encoded audio frame is a silence frame; the code rate setting module is used for setting a first coding code rate according to the sampling rate and the frame length of the coded audio when the coded audio frame is a mute frame; when the coded audio frame is a non-mute frame except the mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate; and an encoding module that encodes the encoded audio frame according to the first encoding rate or the second encoding rate.
In another aspect of the present application, a computer-readable storage medium is provided, which stores computer instructions, where the computer instructions are operable to execute the method for reducing an audio coding rate in the first aspect.
In another aspect of the present application, a computer device is provided, which includes a processor and a memory, where the memory stores computer instructions, and the processor operates the computer instructions to execute the method for reducing an audio coding rate in the first aspect.
The beneficial effect of this application is: the application of this application makes the silence frame to use lower encoding rate to encode in the coding audio frame, reduces the encoding rate of encoder, saves the used coding bandwidth of encoder, reduces the operand, reduces the consumption of encoder, prolongs the live time of encoder, promotes the performance of encoder.
Drawings
FIG. 1 is a flowchart illustrating an embodiment of a method for reducing a coding rate of audio coding according to the present application;
FIG. 2 is a diagram of one embodiment of a silence frame and a non-silence frame in an encoded audio frame;
FIG. 3 is a flowchart illustrating an embodiment of a method for reducing an audio coding rate according to the present application;
FIG. 4 is a schematic diagram illustrating an application effect of the method for reducing an audio coding rate according to the present application;
FIG. 5 is a block diagram illustrating an embodiment of a system for reducing a coding rate of audio coding according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings (if any) are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 shows a specific embodiment of the method for reducing the coding rate of audio coding according to the present application.
In this embodiment, the method for reducing an audio coding rate of the present application includes step S101, determining whether an encoded audio frame is a silence frame; step S102, when the coded audio frame is a mute frame, setting a first coding rate according to the sampling rate and the frame length of the coded audio; when the coded audio frame is a non-mute frame except the mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate; and step S103, coding the coded audio frame according to the first coding rate or the second coding rate.
In the embodiment shown in fig. 1, the method for reducing an audio coding rate of the present application includes step S101 of determining whether an encoded audio frame is a mute frame. By judging whether the coded audio frame is a mute frame or not, different coding code rates are adopted for coding different coded audio frames, so that the waste of the coding code rates is avoided, the calculation amount of the coder is reduced, and the power consumption of the coder is reduced.
In a specific embodiment of the present application, the process of determining whether the encoded audio frame is a silence frame includes: carrying out discrete cosine transform on the encoded audio frame, and recording a discrete cosine transform result; when the discrete cosine transform result is all zero, the coded audio frame is a mute frame, and when one discrete cosine transform result is not zero, the coded audio frame is a non-mute frame except the mute frame.
In this embodiment, the calculation formula of the low-delay modified discrete cosine transform is as follows:
fig. 2 shows a specific example of silent and non-silent frames in encoded audio frames. As can be seen from fig. 2, the non-mute frames have fluctuating amplitudes, while the mute frames have no variation in the upper and lower amplitudes, and the amplitudes are static zeros. Because of the uniqueness of the mute frame in the encoded audio frame, when the discrete cosine transform is performed on the encoded audio frame and the obtained results are all zero, the encoded audio frame is a mute frame, otherwise the encoded audio frame is a non-mute frame. Corresponding to the specific discrete cosine transform formula because of the function in the mute frame
The corresponding results are all 0, and when the discrete cosine transform of the above formula is performed, for example, the final result is obtained
And are all zero. In fig. 2, amplitude signals of the mute frame signal without fluctuation are all zero values. Therefore, it is determined whether the encoded audio frame is a mute frame or not by the result of discrete fourier transform of the encoded audio frame.
In the specific embodiment shown in fig. 1, the method for reducing an audio coding rate of the present application includes step S102, when an encoded audio frame is a mute frame, setting a first coding rate according to a sampling rate and a frame length of the encoded audio; and when the coded audio frame is a non-mute frame except the mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate. The corresponding coding rate is set for the coding audio frames of different types, so that the coding requirements of the coding audio frames of different types can be guaranteed, the coding rate consumption is reduced, the radio frequency power consumption of the Bluetooth transmitting end and the receiving end is reduced, the interference between equipment is reduced, and the use experience of a user is improved.
In a specific embodiment of the present application, the first coding rate is a lowest coding rate for coding the encoded audio frame in a coding standard of the encoder. By the above-mentioned judgment of the mute frame in the encoded audio frame, because of the particularity of the mute frame, the mute frame can be encoded by using the lowest encoding rate specified in the standard specification of the encoder. For example, in the standard specification of the LC3 audio encoder, when the sampling rate is 16KHz mono audio, if the frame length parameter is 10ms, the lowest encoding rate may be 16 kbps.
In a specific embodiment of the present application, the second coding rate is a preset coding rate before the encoder encodes the encoded audio frame. Namely, when the coded audio frame is a non-silent frame, the standard coding process is carried out on the non-silent frame by using the preset coding rate. For example, in the standard specification of the LC3 audio encoder, when the sampling rate is 16KHz monaural audio, if the frame length parameter is 10ms, the preset encoding rate may be 64 kbps.
In the embodiment shown in fig. 1, the method for reducing an audio coding rate of the present application includes step S103, encoding an encoded audio frame according to a first coding rate or a second coding rate.
In the specific implementation mode, by judging the mute frame and the non-mute frame in the encoded audio frame, and setting the corresponding first encoding code rate and second encoding code rate for the mute frame and the non-mute frame, the mute frame or the non-mute frame is encoded in the corresponding encoding module of the encoder by using the first encoding code rate or the second encoding code rate.
The application of the method for reducing the audio coding rate enables the mute frame in the coded audio frame to be coded by using the lower coding rate, saves the coding bandwidth used by the coder, reduces the coding rate of the coder, reduces the operation amount, reduces the radio frequency power consumption of the Bluetooth transmitting end, saves more power consumption, prolongs the service time of the coder, and improves the service performance of the coder.
Fig. 3 shows a specific example of the method for reducing the coding rate of audio coding according to the present application. As shown in fig. 3, the encoded audio frame is first subjected to a discrete cosine transform. For example, a low-delay modified discrete cosine transform is performed, and the result of the low-delay modified discrete cosine transform of the encoded audio frame is determined. And if the result of the low-delay modified discrete cosine transform is all zero, the coded audio frame is a mute frame, and if a non-zero value exists in the result of the low-delay modified discrete cosine transform, the coded audio frame is a non-mute frame. When the coded audio frame is a mute frame, setting a first coding rate according to the frame length and the sampling rate information of the coded audio frame, and then coding the coded audio frame according to the first coding rate. The first coding rate is the lowest coding rate for coding the coded audio frame in the coding standard of the coder. For example, in the standard specification of the LC3 audio encoder, when the sampling rate is 16KHz mono audio, if the frame length parameter is 10ms, the lowest encoding rate may be 16 kbps. When the encoded audio frame is a non-silent frame, a second encoding rate is set, where the second encoding rate is a preset encoding rate before the encoder encodes the encoded audio frame, for example, in the standard specification of the LC3 audio encoder, when the sampling rate is a monaural audio with a 16KHz, if the frame length parameter is 10ms, the preset encoding rate may be 64 kbps. Then, the non-silent frame in the encoded audio frame is encoded according to the second encoding code rate.
Fig. 4 is a schematic diagram of an application effect of the method for reducing the audio coding rate according to the present application. Fig. 4 shows differences of output code streams obtained by using different coding rates for a mute frame in an encoded audio frame. The upper half of fig. 4 shows an output code stream obtained by encoding the mute frame according to a preset encoding rate, and the lower half of fig. 4 shows an output code stream obtained by encoding the mute frame using the lowest encoding rate in the encoder. Wherein, the mute frame corresponding to fig. 4 is a single sound channel, the sampling rate is 16KHz, and the frame length is an audio frame of 10 ms. In the LC3 audio encoder, the LC3 audio encoder presets an encoding code rate of 64kbps, and the corresponding nbbytes have 80 bytes; the lowest coding rate is 16kbps, and the corresponding number of nbbytes is 20 bytes. As can be seen from the upper half of fig. 4, when the mute frame is encoded by using the preset encoding rate, the output code stream has more zero values, and the waste of the encoding rate occurs; when the mute frame is encoded by using the lowest coding rate, as shown in the lower half of fig. 4, the output code stream is reduced by 60 bytes compared with the encoded output code stream encoded by using the preset coding rate. Therefore, the application of the method and the device can be used for coding the mute frame in the coded audio frame by using a lower coding rate, so that the normal coding process of the coder is ensured, the coding rate is saved, the radio frequency power consumption of the Bluetooth transmitting end is reduced, the service time of the equipment is prolonged, the interference among the Bluetooth equipment is reduced, and the use experience of a user is improved.
Fig. 5 shows an embodiment of the system for reducing the coding rate of audio coding according to the present application.
In the embodiment shown in fig. 5, the system for reducing the coding rate of audio coding of the present application includes: a mute frame judgment module which judges whether the encoded audio frame is a mute frame; the code rate setting module is used for setting a first coding code rate according to the sampling rate or the frame length of the coded audio when the coded audio frame is a mute frame; when the coded audio frame is a non-mute frame except the mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate; and an encoding module that encodes the encoded audio frame according to the first encoding rate or the second encoding rate.
In an embodiment of the present application, the process of determining whether the encoded audio frame is a silence frame by the silence frame determining module includes: carrying out discrete cosine transform on the encoded audio frame, and recording a discrete cosine transform result; when all the discrete cosine transform results are zero, the coded audio frame is a mute frame; when there is a discrete cosine transform result that is not zero, the encoded audio frame is a non-silent frame other than the silent frame. Because the non-silent frame has amplitude fluctuating up and down, but the silent frame has no change of the up and down amplitude, the amplitude is static zero, according to the uniqueness of the silent frame in the coded audio frame, the coded audio frame is subjected to discrete cosine transform, the obtained result is all zero, the coded audio frame is a silent frame, otherwise, the coded audio frame is a non-silent frame.
In a specific embodiment of the present application, the first coding rate is a lowest coding rate for coding the encoded audio frame in a coding standard of the encoder, and the second coding rate is a preset coding rate before the encoder codes the encoded audio frame. For example, in the standard specification of the LC3 audio encoder, when the sampling rate is 16KHz for monaural audio, if the frame length parameter is 10ms, the minimum coding rate may be 16kbps, and the preset coding rate may be 64 kbps.
In a particular embodiment of the present application, a computer-readable storage medium stores computer instructions, wherein the computer instructions are operable to perform the method of reducing an audio encoding rate described in any of the embodiments. Wherein the storage medium may be directly in hardware, in a software module executed by a processor, or in a combination of the two.
A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.
The Processor may be a Central Processing Unit (CPU), other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), other Programmable logic devices, discrete Gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one embodiment of the present application, a computer device includes a processor and a memory, the memory storing computer instructions, wherein: the processor operates the computer instructions to perform the method of reducing an audio encoding rate described in any of the embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above embodiments are merely examples, which are not intended to limit the scope of the present disclosure, and all equivalent structural changes made by using the contents of the specification and the drawings, or any other related technical fields, are also included in the scope of the present disclosure.
Claims (10)
1. A method for reducing a code rate of audio coding, comprising:
judging whether the coded audio frame is a mute frame or not;
when the coded audio frame is a mute frame, setting a first coding rate according to the sampling rate and the frame length of the coded audio; when the coded audio frame is a non-mute frame except the mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate;
and coding the coded audio frame according to the first coding rate or the second coding rate.
2. The method for reducing the coding rate of audio according to claim 1, wherein the determining whether the encoded audio frame is a mute frame comprises:
performing discrete cosine transform on the encoded audio frame, and recording a discrete cosine transform result; and
and when the discrete cosine transform results are all zero, the coded audio frame is the mute frame, and when one discrete cosine transform result is not zero, the coded audio frame is the non-mute frame.
3. The method for reducing the coding rate of audio coding of claim 1, wherein the first coding rate is a lowest coding rate of a coding standard of an encoder for coding the encoded audio frame.
4. The method for reducing the coding rate of audio coding of claim 1, wherein the second coding rate is a preset coding rate before the encoder encodes the encoded audio frame.
5. A system for reducing a code rate of audio coding, comprising:
a mute frame judgment module which judges whether the encoded audio frame is a mute frame;
the code rate setting module is used for setting a first coding code rate according to the sampling rate and the frame length of the coded audio when the coded audio frame is a mute frame; when the coded audio frame is a non-mute frame except the mute frame, setting a second coding rate, wherein the first coding rate is lower than the second coding rate; and
an encoding module that encodes the encoded audio frame according to the first encoding rate or a second encoding rate.
6. The system for reducing the coding rate of audio according to claim 5, wherein the determining whether the encoded audio frame is a mute frame in the mute frame determining module comprises:
performing discrete cosine transform on the encoded audio frame, and recording a discrete cosine transform result;
and when the discrete cosine transform results are all zero, the encoded audio frame is the mute frame, and when one discrete cosine transform result is not zero, the encoded audio frame is the non-mute frame except the mute frame.
7. The system for reducing the coding rate of audio coding of claim 5, wherein the first coding rate is a lowest coding rate for coding the encoded audio frame in a coding standard of an encoder.
8. The system for reducing the coding rate of audio according to claim 5, wherein the second coding rate is a preset coding rate before the encoder encodes the encoded audio frame.
9. A computer readable storage medium storing computer instructions, wherein the computer instructions are operable to perform the method of reducing an audio encoding rate of any one of claims 1-4.
10. A computer device comprising a processor and a memory, the memory storing computer instructions, wherein the processor operates the computer instructions to perform the method of reducing an audio encoding rate of any of claims 1-4.
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| CN114566174A (en) * | 2022-04-24 | 2022-05-31 | 北京百瑞互联技术有限公司 | Method, device, system, medium and equipment for optimizing voice coding |
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