WO2021213128A1 - 音频信号编码方法和装置 - Google Patents
音频信号编码方法和装置 Download PDFInfo
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- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
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- 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
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- G—PHYSICS
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- 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
- G10L19/02—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 spectral analysis, e.g. transform vocoders or subband vocoders
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- 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
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- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/003—Changing voice quality, e.g. pitch or formants
Definitions
- This application relates to audio coding and decoding technology, and in particular to an audio signal coding method and device.
- the audio signal that the 3D audio codec needs to compress and encode contains multiple signals.
- a 3D audio codec uses the correlation between channels to downmix multiple signals to obtain downmix signals and multi-channel coding parameters.
- the number of channels of the downmix signal is much smaller than the number of channels of the input audio signal.
- the number of bits used to encode the downmix signal and the multi-channel encoding parameters is much smaller than the number of bits used to independently encode the multi-channel number.
- the correlation between signals of different frequency bands can be further used for encoding.
- the basic principle is to use the correlation between low frequency band signals and signals of different frequency bands, and use band expansion technology or spectrum copy technology to encode high frequency band signals so that less The number of bits encodes the high-band signal, thereby reducing the encoding bit rate of the entire multi-dimensional encoder.
- band expansion technology or spectrum copy technology to encode high frequency band signals so that less The number of bits encodes the high-band signal, thereby reducing the encoding bit rate of the entire multi-dimensional encoder.
- the pitch detection algorithm can be used to determine the tonal component information that needs to be encoded, and then the tonal component information is encoded so that the decoder can accurately decode the high-frequency signal.
- the present application provides an audio signal encoding method and device, which is beneficial to improve the quality of the encoded audio signal.
- the present application provides an audio signal encoding method.
- the method may include: acquiring a current frame of the audio signal.
- the encoding parameter is obtained according to the power spectrum ratio of the current frequency point of the current frequency region of at least part of the signal of the current frame.
- the encoding parameter is used to represent the tonal component information of the at least part of the signal.
- the tonal component information includes position information of the tonal component, At least one of the quantity information of the tonal component, the amplitude information of the tonal component, or the energy information of the tonal component, the power spectrum ratio of the current frequency point is the average of the value of the power spectrum of the current frequency point and the power spectrum of the current frequency region The ratio of the values.
- the code stream is multiplexed on the coding parameter to obtain the code stream.
- the tonal component information of the at least part of the signal is obtained by the power spectrum ratio of the current frequency point of at least part of the signal in the current frame of the audio signal, and the coded stream is obtained based on the tonal component information.
- the power spectrum ratio is the power spectrum
- the ratio to the average value of the power spectrum can better reflect the signal characteristics, so that the tonal component information can be accurately obtained, so that the decoder can reconstruct the audio signal more accurately according to the tonal component information, and improve the coding quality.
- obtaining the coding parameters according to the power spectrum ratio of the current frequency point of the current frequency region of the at least part of the signal may include: performing a peak search in the current frequency region according to the power spectrum ratio of the current frequency point, To obtain at least one of the number information of the peaks in the current frequency region, the position information of the peaks, the amplitude information of the peaks, or the energy information of the peaks, where the peak is a power spectrum peak or a power spectrum ratio peak. Acquire the coding parameter according to at least one of the number information of the peaks in the current frequency region, the position information of the peaks, the amplitude information of the peaks, or the energy information of the peaks.
- a peak search is performed in the current frequency region based on the power spectrum ratio of the current frequency point to obtain relevant information about the peak of the current frequency region (for example, at least one of quantity information, position information, amplitude information, or energy information),
- relevant information about the peak of the current frequency region for example, at least one of quantity information, position information, amplitude information, or energy information
- the foregoing encoding parameters are obtained, so that the decoding end can reconstruct the audio signal more accurately according to the encoding parameters, and improve the encoding quality. Since the power spectrum ratio is used in the peak search process, the accuracy of the peak value obtained by the search can be improved, which is beneficial to improve the accuracy of the tonal component information.
- the use of the power spectrum ratio can improve the peak search efficiency.
- the left neighboring area of the current frequency point includes N_neighbor_l frequency points whose frequency point number is less than the frequency point number of the current frequency point, N_neighbor_l is any natural number, and the right neighboring area of the current frequency point includes the frequency point number greater than the current frequency point.
- N_neighbor_r frequency points of the frequency point sequence number of the point, N_neighbor_r is any natural number.
- the peak search in the current frequency area can improve the peak value obtained by the search accuracy.
- the power spectrum ratio of the current frequency point the power spectrum ratio of the left adjacent frequency point of the current frequency point, the power spectrum ratio of the right adjacent frequency point of the current frequency point, and the current frequency region
- the average value of the power spectrum ratio of the current frequency point, the average value of the power spectrum ratio value of the left neighboring area of the current frequency point, and the average value of the power spectrum ratio value of the right neighboring area of the current frequency point perform a peak search in the current frequency area, It may include: determining whether the power spectrum ratio of the current frequency point meets the following conditions: greater than or equal to the first preset threshold; greater than the power spectrum ratio of the left adjacent frequency point of the current frequency point; greater than the power of the right adjacent frequency point of the current frequency point Spectrum ratio; the difference between the power spectrum ratio of the current frequency point and the average value of the power spectrum ratio of the current frequency point to the left of the adjacent area is greater than the second preset threshold; the power spectrum ratio of the current frequency point to the right adjacent area of the current frequency point The difference between
- performing a peak search in the current frequency region according to the power spectrum ratio of the current frequency point may include: determining whether the power spectrum ratio of the current frequency point satisfies at least one of the following conditions: greater than or equal to The first preset threshold; or, greater than the power spectrum ratio of the left adjacent frequency point of the current frequency point; or, greater than the power spectrum ratio of the right adjacent frequency point of the current frequency point; or, greater than the left adjacent frequency point of the current frequency point The average value of the power spectrum ratio of the region; or, it is greater than the average value of the power spectrum ratio of the adjacent area to the right of the current frequency point; or, it is greater than the average value of the power spectrum ratio of the current frequency region. When at least one of the conditions is met, it is determined that the current frequency point is the frequency point corresponding to the peak value.
- performing a peak search in the current frequency region according to the power spectrum ratio of the current frequency point may include: determining whether the power spectrum ratio of the current frequency point satisfies the following condition: greater than or equal to the first preset Threshold; greater than the power spectrum ratio of the left adjacent frequency point of the current frequency point; greater than the power spectrum ratio of the right adjacent frequency point of the current frequency point. When this condition is met, it is determined that the current frequency point is the frequency point corresponding to the peak value.
- obtaining the coding parameters may include: according to the current frequency At least one of area peak number information, peak position information, peak amplitude information, or peak energy information determines the number information of the tonal component, the position information of the tonal component, the amplitude information of the tonal component, or the energy information of the tonal component At least one of them.
- the encoding parameter is acquired according to at least one of the quantity information of the tonal component, the position information of the tonal component, the amplitude information of the tonal component, or the energy information of the tonal component.
- the tonal component information in the high-band signal of the current frame can be accurately obtained, so that the coding quality can be improved.
- an embodiment of the present application provides an audio signal encoding device.
- the audio signal encoding device may be an encoder or a core encoder, and may also be an encoder or a core encoder for implementing the first aspect or the first aspect described above.
- any possible design method is a functional module.
- the audio signal encoding device can implement the functions performed in the foregoing first aspect or each possible design of the foregoing first aspect, and the functions may be implemented by hardware executing corresponding software.
- the hardware or software includes one or more modules corresponding to the above-mentioned functions.
- the audio signal encoding device may include: an acquisition module, an encoding parameter determination module, and a code stream multiplexing module.
- the acquisition module is used to acquire the current frame of the audio signal.
- the coding parameter determination module is configured to obtain coding parameters according to the power spectrum ratio of the current frequency point of the current frequency region of at least part of the signal of the current frame, and the coding parameter is used to represent the tonal component information of the at least part of the signal.
- the component information includes at least one of the position information of the tonal component, the quantity information of the tonal component, the amplitude information of the tonal component, or the energy information of the tonal component.
- the power spectrum ratio of the current frequency point is the value of the power spectrum of the current frequency point and The ratio of the average value of the power spectrum of the current frequency region.
- the code stream multiplexing module is used to perform code stream multiplexing on the encoding parameter to obtain an encoded code stream.
- the coding parameter determination module is used to: perform a peak search in the current frequency region according to the power spectrum ratio of the current frequency point to obtain the number information and the position information of the peaks in the current frequency region , At least one of peak amplitude information or peak energy information. Acquire the coding parameter according to at least one of the number information of the peaks in the current frequency region, the position information of the peaks, the amplitude information of the peaks, or the energy information of the peaks.
- the coding parameter determination module is used to: according to the power spectrum ratio of the current frequency point, the power spectrum ratio of the left adjacent frequency point of the current frequency point, and the power spectrum ratio of the right adjacent frequency point of the current frequency point.
- the left neighboring area of the current frequency point includes N_neighbor_l frequency points whose frequency point number is less than the frequency point number of the current frequency point, N_neighbor_l is any natural number, and the right neighboring area of the current frequency point includes the frequency point number greater than the current frequency point.
- N_neighbor_r frequency points of the frequency point sequence number of the point, N_neighbor_r is any natural number.
- the left adjacent frequency point of the current frequency point is a frequency point whose sequence number is one less than the current frequency point
- the right adjacent frequency point of the current frequency point is a frequency point whose frequency point sequence number is one greater than the current frequency point.
- the coding parameter determination module is used to determine whether the power spectrum ratio of the current frequency point satisfies the following conditions: greater than or equal to the first preset threshold; greater than the power spectrum of the left adjacent frequency point of the current frequency point Ratio; greater than the power spectrum ratio of the right adjacent frequency point of the current frequency point; the difference between the power spectrum ratio of the current frequency point and the average power spectrum ratio of the left adjacent area of the current frequency point is greater than the second preset threshold; the current frequency point The difference between the power spectrum ratio of the current frequency point and the average value of the power spectrum ratio of the adjacent area to the right of the current frequency point is greater than the third preset threshold; the difference between the power spectrum ratio value of the current frequency point and the average power spectrum ratio value of the current frequency area is greater than the first Four preset thresholds.
- the power spectrum ratio of the current frequency point satisfies the condition, it is determined that the current frequency point is the frequency point corresponding to the peak value.
- the coding parameter determination module is used to determine whether the power spectrum ratio of the current frequency point satisfies the following conditions: greater than or equal to the first preset threshold; greater than the left adjacent frequency point of the current frequency point Power spectrum ratio; greater than the power spectrum ratio of the right adjacent frequency point of the current frequency point. When this condition is met, it is determined that the current frequency point is the frequency point corresponding to the peak value.
- the coding parameter determination module is used to determine the tone component according to at least one of the number information of the peaks in the current frequency region, the position information of the peaks, the amplitude information of the peaks, or the energy information of the peaks. At least one of quantity information, position information of the tonal component, amplitude information of the tonal component, or energy information of the tonal component.
- the encoding parameter is acquired according to at least one of the quantity information of the tonal component, the position information of the tonal component, the amplitude information of the tonal component, or the energy information of the tonal component.
- the at least part of the signal includes the high-band signal of the current frame.
- an embodiment of the present application provides an audio signal encoding device, including: a non-volatile memory and a processor that are coupled to each other, and the processor calls the program code stored in the memory to perform as described in the above-mentioned first aspect. The method of any one of.
- an embodiment of the present application provides an audio signal encoding and decoding device, including: an encoder, configured to execute the method according to any one of the foregoing first aspects.
- an embodiment of the present application provides a computer-readable storage medium, including a computer program, which when executed on a computer, causes the computer to execute the method described in any one of the above-mentioned first aspects.
- an embodiment of the present application provides a computer-readable storage medium, which includes an encoded bitstream obtained according to the method described in any one of the above-mentioned first aspects.
- the present application provides a computer program product.
- the computer program product includes a computer program.
- the computer program When the computer program is executed by a computer, it is used to execute the method described in any one of the above-mentioned first aspects.
- the present application provides a chip including a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned first aspect The method of any one of.
- the audio signal encoding method and device of the embodiments of the present application obtain the tonal component information of the audio signal through the power spectrum ratio of the audio signal, and obtain the coded stream based on the tonal component information, because the power spectrum ratio is the power spectrum and the average power
- the ratio of the spectrum can better reflect the signal characteristics, so that the tonal component information can be accurately obtained, so that the decoder can obtain the audio signal more accurately according to the tonal component information, and improve the coding quality.
- Figure 2 is a schematic diagram of an audio coding application in an embodiment of the application
- Figure 3 is a schematic diagram of an audio coding application in an embodiment of the application
- FIG. 4 is a flowchart of an audio signal encoding method according to an embodiment of the application.
- FIG. 5 is a flowchart of another audio signal encoding method according to an embodiment of the application.
- FIG. 6 is a flowchart of another audio signal encoding method according to an embodiment of the application.
- FIG. 7 is a flowchart of another audio signal encoding method according to an embodiment of the application.
- FIG. 8 is a schematic diagram of an audio signal encoding device according to an embodiment of the application.
- FIG. 9 is a schematic diagram of an audio signal encoding device according to an embodiment of the application.
- At least one (item) refers to one or more, and “multiple” refers to two or more.
- “And/or” is used to describe the association relationship of associated objects, indicating that there can be three types of relationships, for example, “A and/or B” can mean: only A, only B, and both A and B , Where A and B can be singular or plural.
- the character “/” generally indicates that the associated objects before and after are in an “or” relationship.
- the following at least one item (a) or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
- At least one of a, b, or c can mean: a, b, c, "a and b", “a and c", “b and c", or “a and b and c” ", where a, b, and c can be single or multiple respectively, or part of it can be single, and part of it can be multiple.
- Fig. 1 exemplarily shows a schematic block diagram of an audio encoding and decoding system 10 applied in an embodiment of the present application.
- the audio encoding and decoding system 10 may include a source device 12 and a destination device 14.
- the source device 12 generates encoded audio data. Therefore, the source device 12 may be referred to as an audio encoding device.
- the destination device 14 can decode the encoded audio data generated by the source device 12, and therefore, the destination device 14 can be referred to as an audio decoding device.
- Various implementations of source device 12, destination device 14, or both may include one or more processors and memory coupled to the one or more processors.
- the memory may include, but is not limited to, RAM, ROM, EEPROM, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures that can be accessed by a computer, as described herein.
- the source device 12 and the destination device 14 may include various devices, including desktop computers, mobile computing devices, notebook (for example, laptop) computers, tablet computers, set-top boxes, so-called "smart" phones and other telephone handsets , TVs, speakers, digital media players, video game consoles, on-board computers, wireless communication devices, or the like.
- the audio data transmitted from the audio source 16 to the preprocessor 18 may also be referred to as original audio data 17.
- An achievable way is to determine the average value of the power spectrum ratio of the high-band signal in the frequency region and the frequency points of the high-band signal in the frequency region according to the power spectrum ratio of the high-band signal in the frequency region At least one of the average value of the power spectrum ratio of the left adjacent region or the average value of the power spectrum ratio of the right adjacent region of each frequency point of the high-band signal of the frequency region.
- the peak search can be performed on each frequency point in the entire frequency region, or it can be performed only in the range that does not include the start frequency point and the cutoff frequency point in the frequency region, or it can be a pre-defined peak search in the frequency region Within the scope.
- the range of peak search in different frequency regions can be the same or different.
- some frequency points may be selected from the frequency points that meet the above conditions as the frequency points of the filtered peaks, based on the number information of the filtered peaks, the peak position information, and the peak amplitude.
- At least one item of information or peak energy information to determine at least one of the quantity information, position information, amplitude information or energy information of the tone component, according to at least one of the quantity information, position information, amplitude information or energy information of the tone component To obtain the second encoding parameter.
- Step 401 Obtain an average value parameter of the power spectrum ratio according to the power spectrum ratio of the high-band signal in the frequency region.
- tile_width is the tile width
- tile[p] is the starting frequency of the p-th tile
- sb belongs to [tile[p], tile[p]+tile_width-1].
- the second average value parameter of this embodiment is explained and explained, and the second average value parameter neighbor_l can be calculated by the following formula (4).
- the third average value parameter of this embodiment is explained and explained, and the third average value parameter neighbor_r can be calculated by the following formula (5).
- At least one of the first judgment flag, the second judgment flag, the third judgment flag, the fourth judgment flag, or the fifth judgment flag is acquired.
- the second judgment flag is determined. If the power spectrum ratio of the frequency point is greater than the power spectrum ratio of the adjacent left and right frequency points of the frequency point, the second judgment flag is 1, otherwise the second judgment flag is 0. For example, it is judged whether the power spectrum ratio of the frequency point satisfies the condition 2 (Cond2). Cond2: peak_ratio[sb]>peak_ratio[sb-1] and peak_ratio[sb]>peak_ratio[sb+1]. When condition 2 (Cond2) is met, the second judgment flag is 1, otherwise, the second judgment flag is 0.
- a third judgment flag is determined. If the power spectrum ratio of the frequency point is greater than the second average parameter, or the difference between the power spectrum ratio of the frequency point and the second average parameter is greater than the second preset threshold, the third judgment flag is 1, otherwise the first The third judgment flag is 0. For example, if the second preset threshold is 12, it is determined whether the power spectrum ratio of the frequency point satisfies the condition 3 (Cond3). Cond3: peak_ratio[sb]>neighbor_l+12, when condition 3 (Cond3) is met, the third judgment flag is 1, otherwise, the third judgment flag is 0.
- a fifth judgment flag is determined.
- the power spectrum ratio of the frequency point is greater than the first average parameter, or the difference between the power spectrum ratio of the frequency point and the first average parameter is greater than the fourth preset threshold, the fifth judgment flag is 1, otherwise the fifth The judgment flag is 0.
- the third preset threshold is 25, and it is determined whether the power spectrum ratio of the frequency point satisfies the condition 5 (Cond5). Cond5: peak_ratio[sb]>mean_ratio+25, when condition 4 (Cond4) is met, the fifth judgment flag is 1, otherwise, the fifth judgment flag is 0.
- the frequency point is the frequency point corresponding to the peak value.
- the frequency point number of this frequency point is the position information of the peak value.
- the power spectrum ratio of this frequency point is the amplitude or energy information of the peak value. All the frequency points in the frequency region that meet the conditions The number of is the number of peaks in the frequency region.
- the energy of the frequency point where the peak is located is greater than the first preset threshold, greater than the energy of the left adjacent frequency, greater than the energy of the right adjacent frequency, greater than the energy of the left adjacent region, greater than the energy of the right adjacent region, and greater than the average energy.
- the frequency point is the frequency point corresponding to the peak
- the frequency point is The frequency point number is the position information of the peak
- the power spectrum ratio of the frequency point is the amplitude or energy information of the peak
- the number of all frequency points that meet the conditions in the frequency region is the number of peaks in the frequency region.
- peaks that meet the above conditions are used as candidates for tonal components, and their peak positions and peak power spectrum ratios are respectively stored in the peak identifier (peak_idx) and peak value (peak_val) arrays, and the number of peaks is peak_cnt.
- an embodiment of the present application also provides an audio signal encoding device, which can be applied to an audio encoder.
- the acquiring module 801 is used to acquire the current frame of the audio signal.
- the coding parameter determination module 802 is configured to: perform a peak search in the current frequency region according to the power spectrum ratio of the current frequency point to obtain the number information, peak position information, and peak position information of the current frequency region. At least one of peak amplitude information or peak energy information, and the peak is a power spectrum peak or a power spectrum ratio peak. Acquire the coding parameter according to at least one of the number information of the peaks in the current frequency region, the position information of the peaks, the amplitude information of the peaks, or the energy information of the peaks.
- the coding parameter determination module 802 is configured to: according to the power spectrum ratio of the current frequency point, the power spectrum ratio of the left adjacent frequency point of the current frequency point, and the power of the right adjacent frequency point of the current frequency point The spectrum ratio, the average value of the power spectrum ratio of the current frequency region, the average value of the power spectrum ratio of the left adjacent area of the current frequency point and the average value of the power spectrum ratio of the right adjacent area of the current frequency point, in Perform peak search in the frequency area.
- the left neighboring area of the current frequency point includes N_neighbor_l frequency points whose frequency point number is less than the frequency point number of the current frequency point.
- N_neighbor_l is any natural number.
- the right neighboring area of the current frequency point includes the frequency point number greater than that of the current frequency point.
- N_neighbor_r frequency points of the frequency point sequence number, N_neighbor_r is any natural number.
- the left adjacent frequency point of the current frequency point is a frequency point whose sequence number is one less than the current frequency point
- the right adjacent frequency point of the current frequency point is a frequency point whose frequency point sequence number is one greater than the current frequency point.
- the encoding parameter determination module 802 is used to determine whether the power spectrum ratio of the current frequency point satisfies the following conditions: greater than or equal to the first preset threshold; greater than the power of the left adjacent frequency point of the current frequency point Spectrum ratio; greater than the power spectrum ratio of the right adjacent frequency point of the current frequency point; The difference between the power spectrum ratio of the current frequency point and the average power spectrum ratio of the left adjacent area of the current frequency point is greater than the second preset threshold; The difference between the power spectrum ratio of the current frequency point and the average value of the power spectrum ratio of the right neighboring area of the current frequency point is greater than the third preset threshold; the average of the power spectrum ratio of the current frequency point and the power spectrum ratio of the current frequency region The value difference is greater than the fourth preset threshold. When the power spectrum ratio of the current frequency point satisfies the condition, it is determined that the current frequency point is the frequency point corresponding to the peak value.
- the encoding parameter determination module 802 is used to determine whether the power spectrum ratio of the current frequency point satisfies at least one of the following conditions: greater than or equal to a first preset threshold; or greater than the left of the current frequency point The power spectrum ratio of the adjacent frequency point; or, greater than the power spectrum ratio of the right adjacent frequency point of the current frequency point; or, greater than the average value of the power spectrum ratio of the left adjacent area of the current frequency point; or, greater than the current frequency point The average value of the power spectrum ratio of the adjacent area on the right; or, greater than the average value of the power spectrum ratio of the current frequency area. When at least one of the conditions is met, it is determined that the current frequency point is the frequency point corresponding to the peak value.
- the coding parameter determination module 802 is configured to determine the number of tonal components according to at least one of the number information of the peaks in the current frequency region, the position information of the peaks, the amplitude information of the peaks, or the energy information of the peaks. At least one of information, position information of the tonal component, amplitude information of the tonal component, or energy information of the tonal component.
- the encoding parameter is acquired according to at least one of the quantity information of the tonal component, the position information of the tonal component, the amplitude information of the tonal component, or the energy information of the tonal component.
- the at least part of the signal includes a high-band signal of the current frame.
- the above-mentioned acquisition module 801, encoding parameter determination module 802, and code stream multiplexing module 803 can be applied to the audio signal encoding process at the encoding end.
- an audio signal encoder is used to encode audio signals, including: ,
- the audio signal encoding device is used to encode and generate the corresponding code stream.
- an embodiment of the present application provides a device for encoding audio signals, for example, an audio signal encoding device.
- the audio signal encoding device 900 includes:
- the processor 901, the memory 902, and the communication interface 903 (the number of the processors 901 in the audio signal encoding device 900 may be one or more, and one processor is taken as an example in FIG. 9).
- the processor 901, the memory 902, and the communication interface 903 may be connected by a bus or in other ways, wherein the connection by a bus is taken as an example in FIG. 9.
- the memory 902 may include a read-only memory and a random access memory, and provides instructions and data to the processor 901. A part of the memory 902 may also include a non-volatile random access memory (NVRAM).
- NVRAM non-volatile random access memory
- the memory 902 stores an operating system and operating instructions, executable modules or data structures, or a subset of them, or an extended set of them.
- the operating instructions may include various operating instructions for implementing various operations.
- the operating system may include various system programs for implementing various basic services and processing hardware-based tasks.
- the processor 901 controls the operation of the audio encoding device, and the processor 901 may also be referred to as a central processing unit (CPU).
- the various components of the audio encoding device are coupled together through a bus system.
- the bus system may also include a power bus, a control bus, and a status signal bus.
- various buses are referred to as bus systems in the figure.
- the method disclosed in the foregoing embodiment of the present application may be applied to the processor 901 or implemented by the processor 901.
- the processor 901 may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method can be completed by an integrated logic circuit of hardware in the processor 901 or instructions in the form of software.
- the aforementioned processor 901 may be a general-purpose processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or Other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
- DSP digital signal processing
- ASIC application specific integrated circuit
- FPGA field-programmable gate array
- the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
- the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
- the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
- the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
- the storage medium is located in the memory 902, and the processor 901 reads the information in the memory 902, and completes the steps of the foregoing method in combination with its hardware.
- the communication interface 903 can be used to receive or send digital or character information, for example, it can be an input/output interface, a pin, or a circuit. For example, the above-mentioned coded stream is sent through the communication interface 903.
- an embodiment of the present application provides an audio encoding device, including: a non-volatile memory and a processor coupled to each other, and the processor calls the program code stored in the memory to execute Part or all of the steps of the audio signal encoding method as described in one or more embodiments above.
- an embodiment of the present application provides a computer-readable storage medium that stores program code, wherein the program code includes one or more Instructions for part or all of the steps of the audio signal encoding method described in the embodiment.
- embodiments of the present application provide a computer program product, which when the computer program product runs on a computer, causes the computer to execute the audio frequency described in one or more of the above embodiments. Part or all of the steps of a signal encoding method.
- the processor mentioned in the above embodiments may be an integrated circuit chip with signal processing capability.
- the steps of the foregoing method embodiments may be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
- the processor can be a general-purpose processor, digital signal processor (digital signal processor, DSP), application-specific integrated circuit (ASIC), field programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
- the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
- the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware encoding processor, or executed and completed by a combination of hardware and software modules in the encoding processor.
- the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
- the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
- the memory mentioned in the above embodiments may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
- the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
- the volatile memory may be random access memory (RAM), which is used as an external cache.
- RAM random access memory
- static random access memory static random access memory
- dynamic RAM dynamic RAM
- DRAM dynamic random access memory
- synchronous dynamic random access memory synchronous DRAM, SDRAM
- double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
- enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
- synchronous connection dynamic random access memory serial DRAM, SLDRAM
- direct rambus RAM direct rambus RAM
- the disclosed system, device, and method can be implemented in other ways.
- the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
- the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
- the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
- the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
- the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (personal computer, server, or network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
- the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks and other media that can store program codes. .
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Abstract
Description
Claims (20)
- 一种音频信号编码方法,其特征在于,包括:获取音频信号的当前帧;根据所述当前帧的至少部分信号的当前频率区域的当前频点的功率谱比值获取编码参数,所述编码参数用于表示所述至少部分信号的音调成分信息,所述音调成分信息包括音调成分的位置信息、音调成分的数量信息、音调成分的幅度信息或音调成分的能量信息中至少一项,所述当前频点的功率谱比值为所述当前频点的功率谱的值与所述当前频率区域的功率谱的平均值的比值;对所述编码参数进行码流复用,获取编码码流。
- 根据权利要求1所述的方法,其特征在于,所述根据所述至少部分信号的当前频率区域的当前频点的功率谱比值获取编码参数,包括:根据所述当前频点的功率谱比值在所述当前频率区域进行峰值搜索,以获取所述当前频率区域的峰值的数量信息、峰值的位置信息、峰值的幅度信息或峰值的能量信息中至少一项;所述峰值为功率谱峰值或功率谱比值峰值;根据所述当前频率区域的峰值的数量信息、峰值的位置信息、峰值的幅度信息或峰值的能量信息中至少一项,获取所述编码参数。
- 根据权利要求2所述的方法,其特征在于,所述根据所述当前频点的功率谱比值在所述当前频率区域进行峰值搜索,包括:根据所述当前频点的功率谱比值、所述当前频点的左邻频点的功率谱比值、所述当前频点的右邻频点的功率谱比值、所述当前频率区域的功率谱比值的平均值、所述当前频点的左邻区域的功率谱比值的平均值和所述当前频点的右邻区域的功率谱比值的平均值,在所述当前频率区域内进行峰值搜索;其中,所述当前频点的左邻区域包括频点序号小于所述当前频点的频点序号的N_neighbor_l个频点,N_neighbor_l为自然数,所述当前频点的右邻区域包括频点序号大于所述当前频点的频点序号的N_neighbor_r个频点,N_neighbor_r为自然数;所述当前频点的左邻频点是频点序号比所述当前频点小1的频点,所述当前频点的右邻频点是频点序号比所述当前频点大1的频点。
- 根据权利要求3所述的方法,其特征在于,所述根据所述当前频点的功率谱比值、所述当前频点的左邻频点的功率谱比值、所述当前频点的右邻频点的功率谱比值、所述当前频率区域的功率谱比值的平均值、所述当前频点的左邻区域的功率谱比值的平均值和所述当前频点的右邻区域的功率谱比值的平均值,在所述当前频率区域内进行峰值搜索,包括:判断所述当前频点的功率谱比值是否满足以下条件:大于或等于第一预设阈值;大于所述当前频点的左邻频点的功率谱比值;大于所述当前频点的右邻频点的功率谱比值;所述当前频点的功率谱比值与所述当前频点的左邻区域的功率谱比值的平均值的差大于第二预设阈值;所述当前频点的功率谱比值与所述当前频点的右邻区域的功率谱比值的平均值的差大于第三预设阈值;所述当前频点的功率谱比值与所述当前频率区域的功率谱比值的平均值的差大于第四预设阈值;当满足所述条件时,确定所述当前频点为所述当前频率区域的峰值对应的频点。
- 根据权利要求2所述的方法,其特征在于,所述根据所述当前频点的功率谱比值在所述当前频率区域进行峰值搜索,包括:判断所述当前频点的功率谱比值是否满足以下条件中至少一项:大于或等于第一预设阈值;或者,大于所述当前频点的左邻频点的功率谱比值;或者,大于所述当前频点的右邻频点的功率谱比值;或者,大于所述当前频点的左邻区域的功率谱比值的平均值;或者,大于所述当前频点的右邻区域的功率谱比值的平均值;或者,大于所述当前频率区域的功率谱比值的平均值;当所述当前频点的功率谱比值满足所述条件中至少一项时,确定所述当前频点为所述当前频率区域的峰值对应的频点;其中,所述当前频点的左邻区域包括频点序号小于所述当前频点的频点序号的N_neighbor_l个频点,N_neighbor_l为自然数,所述当前频点的右邻区域包括频点序号大于所述当前频点的频点序号的N_neighbor_r个频点,N_neighbor_r为自然数;所述当前频点的左邻频点是频点序号比所述当前频点小1的频点,所述当前频点的右邻频点是频点序号比所述当前频点大1的频点。
- 根据权利要求2所述的方法,其特征在于,所述根据所述当前频点的功率谱比值在所述当前频率区域进行峰值搜索,包括:判断所述当前频点的功率谱比值是否满足以下条件:大于或等于第一预设阈值;大于所述当前频点的左邻频点的功率谱比值;大于所述当前频点的右邻频点的功率谱比值;当满足所述条件时,确定所述当前频点为所述当前频率区域的峰值对应的频点;所述当前频点的左邻频点是频点序号比所述当前频点小1的频点,所述当前频点的右邻频点是频点序号比所述当前频点大1的频点。
- 根据权利要求2至6任一项所述的方法,其特征在于,所述根据所述当前频率区域的峰值的数量信息、峰值的位置信息、峰值的幅度信息或峰值的能量信息中至少一项,获取所述编码参数,包括:根据所述当前频率区域的峰值的数量信息、峰值的位置信息、峰值的幅度信息或峰值的能量信息中至少一项,确定音调成分的数量信息、音调成分的位置信息、音调成分的幅度信息或音调成分的能量信息中至少一项;根据所述音调成分的数量信息、所述音调成分的位置信息、所述音调成分的幅度信息或所述音调成分的能量信息中至少一项,获取所述编码参数。
- 根据权利要求1至7任一项所述的方法,其特征在于,所述至少部分信号包括所述当前帧的高频带信号。
- 一种音频信号编码装置,其特征在于,包括:获取模块,用于获取音频信号的当前帧;编码参数确定模块,用于根据所述当前帧的至少部分信号的当前频率区域的当前频点的功率谱比值,获取编码参数,所述编码参数用于表示所述至少部分信号的音调成分信息,所述音调成分信息包括音调成分的位置信息、音调成分的数量信息、音调成分的幅度信息或音调成分的能量信息中至少一项,所述当前频点的功率谱比值为所述当前频点的功率谱的值与所述当前频率区域的功率谱的平均值的比值;码流复用模块,用于对所述编码参数进行码流复用,获取编码码流。
- 根据权利要求9所述的装置,其特征在于,所述编码参数确定模块用于:根据所述当前频点的功率谱比值在所述当前频率区域进行峰值搜索,以获取所述当前频率区域的峰值的数量信息、峰值的位置信息、峰值的幅度信息或峰值的能量信息中至少一项;所述峰值为功率谱峰值或功率谱比值峰值;根据所述当前频率区域的峰值的数量信息、峰值的位置信息、峰值的幅度信息或峰值的能量信息中至少一项,获取所述编码参数。
- 根据权利要求10所述的装置,其特征在于,所述编码参数确定模块用于:根据所述当前频点的功率谱比值、所述当前频点的左邻频点的功率谱比值、所述当前频点的右邻频点的功率谱比值、所述当前频率区域的功率谱比值的平均值、所述当前频点的左邻区域的功率谱比值的平均值和所述当前频点的右邻区域的功率谱比值的平均值,在所述当前频率区域内进行峰值搜索;其中,所述当前频点的左邻区域包括频点序号小于所述当前频点的频点序号的N_neighbor_l个频点,N_neighbor_l为任意自然数,所述当前频点的右邻区域包括频点序号大于所述当前频点的频点序号的N_neighbor_r个频点,N_neighbor_r为任意自然数;所述当前频点的左邻频点是频点序号比所述当前频点小1的频点,所述当前频点的右邻频点是频点序号比所述当前频点大1的频点。
- 根据权利要求11所述的装置,其特征在于,所述编码参数确定模块用于:判断所述当前频点的功率谱比值是否满足以下条件:大于或等于第一预设阈值;大于所述当前频点的左邻频点的功率谱比值;大于所述当前频点的右邻频点的功率谱比值;所述当前频点的功率谱比值与所述当前频点的左邻区域的功率谱比值的平均值的差大于第二预设阈值;所述当前频点的功率谱比值与所述当前频点的右邻区域的功率谱比值的平均值的差大于第三预设阈值;所述当前频点的功率谱比值与所述当前频率区域的功率谱比值的平均值的差大于第四预设阈值;当满足所述条件时,确定所述当前频点为所述当前频率区域的峰值对应的频点。
- 根据权利要求10所述的装置,其特征在于,所述编码参数确定模块用于:判断所述当前频点的功率谱比值是否满足以下条件中至少一项:大于或等于第一预设阈值;或者,大于所述当前频点的左邻频点的功率谱比值;或者,大于所述当前频点的右邻频点的功率谱比值;或者,大于所述当前频点的左邻区域的功率谱比值的平均值;或者,大于所述当前频点的右邻区域的功率谱比值的平均值;或者,大于所述当前频率区域的功率谱比值的平均值;当所述当前频点的功率谱比值满足所述条件中至少一项时,确定所述当前频点为所述当前频率区域的峰值对应的频点;其中,所述当前频点的左邻区域包括频点序号小于所述当前频点的频点序号的N_neighbor_l个频点,N_neighbor_l为自然数,所述当前频点的右邻区域包括频点序号大于所述当前频点的频点序号的N_neighbor_r个频点,N_neighbor_r为自然数;所述当前频点的左邻频点是频点序号比所述当前频点小1的频点,所述当前频点的右邻频点是频点序号比所述当前频点大1的频点。
- 根据权利要求11所述的装置,其特征在于,所述编码参数确定模块用于:判断所述当前频点的功率谱比值是否满足以下条件:大于或等于第一预设阈值;大于 所述当前频点的左邻频点的功率谱比值;大于所述当前频点的右邻频点的功率谱比值;当满足所述条件时,确定所述当前频点为所述频率区域的峰值对应的频点;所述当前频点的左邻频点是频点序号比所述当前频点小1的频点,所述当前频点的右邻频点是频点序号比所述当前频点大1的频点。
- 根据权利要求10至14任一项所述的装置,其特征在于,所述编码参数确定模块用于:根据所述当前频率区域的峰值的数量信息、峰值的位置信息、峰值的幅度信息或峰值的能量信息中至少一项,确定音调成分的数量信息、音调成分的位置信息、音调成分的幅度信息或音调成分的能量信息中至少一项;根据所述音调成分的数量信息、所述音调成分的位置信息、所述音调成分的幅度信息或所述音调成分的能量信息中至少一项,获取所述编码参数。
- 根据权利要求15所述的装置,其特征在于,所述至少部分信号包括所述当前帧的高频带信号。
- 一种音频信号编码装置,其特征在于,包括:相互耦合的非易失性存储器和处理器,所述处理器调用存储在所述存储器中的程序代码以执行如权利要求1至8任一项所述的方法。
- 一种音频信号编解码设备,其特征在于,包括:编码器,所述编码器用于执行如权利要求1至8任一项所述的方法。
- 一种计算机可读存储介质,其特征在于,包括计算机程序,所述计算机程序在计算机上被执行时,使得所述计算机执行权利要求1至8任一项所述的方法。
- 一种计算机可读存储介质,其特征在于,包括根据如权利要求1至8任一项所述的方法获得的编码码流。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21793658.2A EP4131263A4 (en) | 2020-04-21 | 2021-03-25 | METHOD AND DEVICE FOR AUDIO SIGNAL ENCODING |
BR112022021356A BR112022021356A2 (pt) | 2020-04-21 | 2021-03-25 | Método e aparelho de codificação de sinal de áudio |
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KR20230002899A (ko) | 2023-01-05 |
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