CN116388930A - Coding and decoding control method and device of self-organizing network and electronic equipment - Google Patents
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Abstract
The disclosure provides a coding and decoding control method, a device and an electronic device of an ad hoc network, wherein the method comprises the following steps: when the current node is accessed to a neighboring node of the MESH network, acquiring the channel capacity and the network delay of a voice channel of the current node; and determining the corresponding relation between the bit signal-to-noise ratio of the voice channel and the coding rate of the voice signal, adjusting the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, and controlling the network delay of the voice channel of the current node to be smaller than the preset duration. The coding and decoding control method of the self-organizing network can adjust the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, adaptively adjust the coding rate of the voice signal of the current node, control the network delay of the voice channel of the current node to be smaller than the preset duration, realize the low-rate narrow-bandwidth communication of the current node, and reduce the network delay of the voice signal transmission in the self-organizing network.
Description
Technical Field
The disclosure relates to the technical field of communication, and in particular relates to a coding and decoding control method, a device and electronic equipment of an ad hoc network.
Background
The wireless self-organizing network (Mobile Ad Hoc Network) is a wireless mobile communication network which is composed of a plurality of nodes with wireless receiving and transmitting functions and is free of infrastructure. Because the transmission power of each node is limited, and the transmission distance is limited, when the nodes cannot directly communicate, relay forwarding is needed by other nodes in the network, so that the wireless ad hoc network is also a wireless multi-hop communication network.
The wireless self-organizing network does not have base stations and other infrastructures as an relying on, and nodes in the network need distributed interactive access control, routing tables, time synchronization and other signaling messages and service messages to complete networking and transmission; meanwhile, all nodes in the network share a wireless channel, and each node can obtain network access and channel resource utilization rights according to a certain strategy. In an ad hoc network, how to reduce network delay of voice signal transmission in the ad hoc network is an important problem to be solved.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiments of the present disclosure provide a method, an apparatus, and an electronic device for controlling encoding and decoding of an ad hoc network. The technical scheme is as follows:
in a first aspect, a method for controlling coding and decoding of an ad hoc network is provided, the method comprising: when a current node is accessed to a neighboring node of a MESH network, acquiring the channel capacity, the bit signal-to-noise ratio and the network delay of a voice channel of the current node; determining the corresponding relation between the bit signal-to-noise ratio of the voice channel of the current node and the coding code rate of the voice signal; and adjusting the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, and controlling the network delay of the voice channel of the current node to be smaller than a preset duration.
In a second aspect, there is provided an adaptive codec control apparatus, the apparatus comprising: the detection module is used for acquiring the channel capacity and the bit signal-to-noise ratio of a voice channel of a current node when the current node is accessed to an adjacent node of the MESH network;
the processing module is used for determining the corresponding relation between the bit signal-to-noise ratio of the voice channel of the current node and the coding code rate of the voice signal;
and the control module is used for controlling the bit signal-to-noise ratio of the voice channel of the current node to be larger than a preset threshold according to the corresponding relation between the bit signal-to-noise ratio and the coding code rate under the condition that the bit signal-to-noise ratio is smaller than the preset threshold.
In a third aspect, an electronic device is provided, the electronic device comprising a memory and a processor; the memory is used for storing computer instructions; the processor is configured to perform any one of the above-described codec control methods.
The coding and decoding control method of the self-organizing network can adjust the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, adaptively adjust the coding rate of the voice signal of the current node, control the network delay of the voice channel of the current node to be smaller than the preset duration, realize the low-rate narrow-bandwidth communication of the current node, and reduce the network delay of the voice signal transmission in the self-organizing network.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic view of an application scenario of an ad hoc network according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of an encoder of an ad hoc network according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a decoder of an ad hoc network according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a decoder of an ad hoc network according to an embodiment of the present disclosure;
fig. 5 is a flowchart illustrating a codec control method according to an embodiment of the present disclosure.
Description of the embodiments
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
The codec control method of the ad hoc network provided in the embodiment of the present disclosure is applicable to the ad hoc network, referring to fig. 1, in the ad hoc network, a phenomenon of preempting resources occurs in using a plurality of nodes of the network, so that real-time performance and low latency are required to be ensured by narrowing bandwidth, realizing streaming media division communication, and realizing a high compression ratio of a file. Low bit rate digital speech coding is a key technology in digital speech communication. In digital communication, voice is transmitted after digital processing, and voice data is compressed and corrected in the processing process, so that the purposes of reducing channel bandwidth occupation and improving signal to noise ratio are realized, and additional functions of enhancing voice, voice encryption and the like can be further realized.
A vocoder (vocoder) is a codec for analyzing and synthesizing voice, and is applied to a voice analysis and synthesis system or a voice band compression system to realize voice communication band compression and secret communication. The vocoder is divided into an encoder that converts an audio signal into a bit stream for channel transmission and a decoder that restores parameters for speech synthesis from the bit stream to perform speech synthesis and outputs audio data.
Currently, common speech parameter quantization methods used by encoders include methods such as enhanced variable rate codec (Enhanced Variable Rate Codec, EVRC), internet low bit rate coding (Internet Low Bitrate Codec, ILBC), adaptive multi-rate speech coding (Adaptive Multi Rate, AMR), and the like.
In the related art, the voice coding and decoding schemes such as Opus and speex have wide bandwidth variable range and multiple applicable scenes, and the coding and decoding scheme provided by the embodiment of the disclosure is suitable for narrowband communication of the self-organizing network, and compared with the voice coding and decoding scheme widely used at present, the high-quality transmission is realized pertinently.
Extracting speech parameters by an encoder and forming a bit stream based on a linear prediction hybrid excitation model development; the decoder recovers the speech from the bitstream according to the parameters therein. The vocoder operates based on a digital signal, and the speech signal input to the encoder is 8000Hz sampled and 16-bit linear PCM quantized to the analog input signal, and the output of the decoder is identical thereto.
Referring to fig. 2, the encoder performs analysis and parameter extraction in units of frames, and a frame time length is 20ms, corresponding to 160 sampling points. The encoder operates in a 1200bps low bit rate mode, and the encoder jointly quantizes the speech parameters of three consecutive frames, outputting a super frame bit stream equivalent to 60ms at a time, each super frame bit stream having a length of 72 bits (9 bytes).
Referring to fig. 3, the decoder extracts quantization parameters from the bit stream obtained from the channel, and restores the pitch period, sub-band voicing level, LP coefficient, gain and fourier amplitude according to the codebook. Next, a voiced excitation is generated using the pitch period and fourier amplitude, and an unvoiced excitation is generated using a white noise generator. Finally, mixing the two excitation, and obtaining the final voice signal after LP synthesis, gain adjustment and post-filtering. Corresponding to the encoder, the decoder operates in a 1200bps low bit rate mode, and the decoder outputs digital speech for 60ms at a time, including 480 speech samples.
Referring to fig. 4, the decoder operates according to the flow shown in fig. 4, and is divided into two parts, i.e., parameter extraction and speech synthesis, and synthesizes three frames of speech at a time in a 1200bps low bit rate mode. Parameter extraction is the inverse of parameter quantization, and parameters of one superframe, i.e., three frames, are extracted at a time. The parameters extracted per frame include: pitch period, unvoiced mode, LPC coefficients, fourier magnitude, gain, and aperiodic flag.
The speech synthesis process synthesizes the speech signal in pitch period units, sequentially within 16 samples of a frame, until the synthesized samples are longer than 160. Let P0 be the starting sample of the first pitch period in the current frame, and the pitch period be P, then the following steps are performed in a frame:
(1) Synthesizing a section of voice with the degree of P by taking P0 as a starting point, and placing the voice into a buffer area of a decoder; increment the value of p 0: p0=p0+p; (2) Checking p0, if p0<160, returning to the first step to synthesize the voice signal of the next period; otherwise, the complete speech of one frame is considered to be synthesized, and p0=p0-160 is adjusted as a starting point of speech synthesis of the next frame.
In order to ensure the continuity of the signal, interpolation is needed to be carried out on the parameters extracted from the current frame during the synthesis of each period, and then the parameters are taken as actual synthesis parameters: para=ic x Para -1 +(1- ic)*Para 0 . Wherein Para -1 Is the decoding parameter of the previous frame, para 0 Is the decoding parameter of the current frame, ic=p0/160 is the interpolation coefficient. LP synthesis filter: the LPC coefficients are calculated from the interpolated LSF parameters.
Pulse shaping filter: and (3) pulse shaping is carried out on the adjusted synthesized signal through a 65-order FIR filter, so that a final synthesized voice signal is obtained. Since the synthesized signal is in units of pitch period length, buffer control is required to splice into a complete speech frame output of 160 samples.
Referring to fig. 5, an embodiment of the present disclosure provides a codec control method of an ad hoc network, which is applied to a vocoder of an electronic device, the method including the steps of:
step A101: and when the current node accesses to the adjacent node of the MESH network, acquiring the channel capacity and the network delay of the voice channel of the current node.
The wireless MESH network belongs to a new wireless local area network and comprises wifi MESH, bluetooth MESH, zigbee MESH and the like. Multiple hop data forwarding links can be established between nodes in the wireless MESH network. Network flooding is a method for transmitting information by using the MESH technology, and data packets are transmitted on the MESH network in a large scale and nondirectional manner. However, excessive and unnecessary network flooding may cause problems such as packet collisions, network congestion, bandwidth degradation, and even network paralysis in severe cases.
In an example, R characterizes the coding rate, eb characterizes the bit energy, N 0 Meter/2The relationship between the signal-to-noise ratio and the bit signal-to-noise ratio, which characterizes the noise power spectral density, is as follows: SNR of 1 =R*E b /(N 0 /2)
Step 103: and adjusting the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, and controlling the network delay of the voice channel of the current node to be smaller than a preset duration.
The coding and decoding control method of the self-organizing network can adjust the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, adaptively adjust the coding rate of the voice signal of the current node, control the network delay of the voice channel of the current node to be smaller than the preset duration, realize the low-rate narrow-bandwidth communication of the current node, and reduce the network delay of the voice signal transmission in the self-organizing network.
In one embodiment, the above codec control method further includes the steps of: and under the condition that the bit signal-to-noise ratio is smaller than a preset threshold, controlling the bit signal-to-noise ratio of the voice channel of the current node to be larger than the preset threshold according to the corresponding relation between the bit signal-to-noise ratio and the coding code rate.
In one embodiment, when a current node accesses a neighboring node of a MESH network, the method acquires the channel capacity, the bit signal-to-noise ratio and the network delay of a voice channel of the current node, and comprises the following steps:
step 201: and acquiring the channel capacity of the voice channel of the current node according to the evaluation value of the channel capacity C, wherein the calculation formula of the evaluation value of the channel capacity C is as follows: p (P) m c= （C m -{C 1 ,C 2 ,…,C n } min ）/({C 1 ,C 2 ,…,C n } max -{C 1 ,C 2 ,…,C n } min ) 。
P m c Channel capacity assessment value characterizing the mth speech channel, cm characterizing the channel capacity of the mth speech channel, { C1, C2, …, cn } max Characterizing the maximum value of channel capacity in n speech channels, { C1, C2, …, cn } min Representing channel capacity in n voice channelsM=1, 2, … n;
step 201: and acquiring the network delay of the voice channel of the current node according to the evaluation value of the transmission delay tau, wherein the evaluation value of the transmission delay tau is calculated as follows: p (P) m τ= （{τ 1 ,τ 2 ,…,τ n } max -τ m ）/({τ 1 ,τ 2 ,…,τ n } max -{τ 1 ,τ 2 ,…,τ n } min ) 。
P m τ Representing the transmission delay evaluation value of the mth voice channel, tau m Characterizing transmission delay of mth speech channel, { τ 1 ,τ 2 ,…,τ n } max Represents the maximum value of the transmission delay in n voice channels, { τ 1 ,τ 2 ,…,τ n } min Representing the minimum value of the transmission delay in n voice channels, m=1, 2, … n.
In one embodiment, the determining the correspondence between the bit signal-to-noise ratio and the coding rate of the voice channel of the current node includes the following steps: determining the corresponding relation between the bit signal-to-noise ratio and the symbol signal-to-noise ratio according to the channel capacity of the current node; and determining the corresponding relation between the bit signal-to-noise ratio of the voice channel of the current node and the coding code rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the symbol signal-to-noise ratio.
In an example, E s /N o For symbol signal to noise ratio, E b For bit signal-to-noise ratio, symbol signal-to-noise ratio and bit signal-to-noise ratio E b /N o The relation of (2) is: e (E) s /N 0 ＝k b E b /N 0 Wherein k is b For the number of bits per symbol, L 0 Is the estimated number of related symbols.
In one embodiment, the controlling the bit signal-to-noise ratio of the voice channel of the current node to be greater than a preset threshold according to the corresponding relation between the bit signal-to-noise ratio and the coding rate includes the following steps: according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, the coding rate of the voice signal of the current node is adjusted; and controlling the bit signal-to-noise ratio of the voice channel of the current node to be larger than the preset threshold according to the adjusted coding rate.
In one embodiment, when the bit snr is smaller than a preset threshold, the method controls the bit snr of the voice channel of the current node to be greater than the preset threshold according to the corresponding relationship between the bit snr and the coding rate, and includes the following steps: detecting the bit signal-to-noise ratio of the voice channel of the current node at intervals of a preset time period; and under the condition that the bit signal-to-noise ratio is smaller than a preset threshold, controlling the bit signal-to-noise ratio of the voice channel of the current node to be larger than the preset threshold according to the corresponding relation between the bit signal-to-noise ratio and the coding code rate.
The above description of various embodiments is intended to emphasize the differences between the various embodiments, which may be the same or similar with reference to each other. The methods disclosed in the method embodiments provided by the application can be arbitrarily combined under the condition of no conflict to obtain a new method embodiment. The features disclosed in the embodiments of the products provided by the application can be arbitrarily combined under the condition of no conflict, so as to obtain new embodiments of the products. The features disclosed in the embodiments of the method or the apparatus provided in the application may be arbitrarily combined without conflict to obtain a new embodiment of the method or the apparatus.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are merely illustrative, and exemplary, the division of units is merely a logical function division, and there may be other manners of division in actual implementation, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to a device or unit, whether electrically, mechanically, or otherwise.
The units described above as separate components may or may not be physically separate, and components displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of grid units; the object of the present embodiment can be achieved according to the fact that some or all of the units thereof can be selected.
The functional units in the embodiments of the present application may be all integrated in one processing module, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
Those of ordinary skill in the art will appreciate that: all or part of the steps of implementing the above method embodiments may be implemented by hardware associated with program instructions, and the above program may be stored in a computer readable storage medium, which when executed, performs steps including the above method embodiments.
The foregoing is merely specific embodiments of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and all changes and substitutions are intended to be covered in the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for controlling coding and decoding of an ad hoc network, the method comprising:
when a current node accesses to a neighboring node of a MESH network, acquiring the channel capacity and network delay of a voice channel of the current node;
determining the corresponding relation between the bit signal-to-noise ratio of the voice channel of the current node and the coding code rate of the voice signal;
and adjusting the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, and controlling the network delay of the voice channel of the current node to be smaller than a preset duration.
2. The method according to claim 1, wherein the method further comprises:
acquiring bit signal noise of a voice channel of the current node; and under the condition that the bit signal-to-noise ratio is smaller than a preset threshold, controlling the bit signal-to-noise ratio of the voice channel of the current node to be larger than the preset threshold according to the corresponding relation between the bit signal-to-noise ratio and the coding code rate.
3. The method according to claim 1, wherein the obtaining the channel capacity and the network delay of the voice channel of the current node when the current node accesses the neighboring node of the MESH network comprises:
acquiring the channel capacity of the voice channel of the current node according to the evaluation value of the channel capacity; and acquiring the network delay of the voice channel of the current node according to the evaluation value of the transmission delay.
4. The method of claim 1, wherein determining the correspondence between the bit signal-to-noise ratio and the coding rate of the voice channel of the current node comprises:
determining the corresponding relation between the bit signal-to-noise ratio and the symbol signal-to-noise ratio according to the channel capacity of the current node;
and determining the corresponding relation between the bit signal-to-noise ratio of the voice channel of the current node and the coding code rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the symbol signal-to-noise ratio.
5. The method according to claim 2, wherein the controlling the bit signal-to-noise ratio of the voice channel of the current node to be greater than a preset threshold according to the correspondence between the bit signal-to-noise ratio and the coding rate comprises:
according to the corresponding relation between the bit signal-to-noise ratio and the coding rate, the coding rate of the voice signal of the current node is adjusted;
and controlling the bit signal-to-noise ratio of the voice channel of the current node to be larger than the preset threshold according to the adjusted coding rate.
6. The method according to claim 2, wherein, in the case that the bit signal-to-noise ratio is smaller than a preset threshold, controlling the bit signal-to-noise ratio of the voice channel of the current node to be greater than the preset threshold according to the correspondence between the bit signal-to-noise ratio and the coding rate comprises:
detecting the bit signal-to-noise ratio of the voice channel of the current node at intervals of a preset time period;
and under the condition that the bit signal-to-noise ratio is smaller than a preset threshold, controlling the bit signal-to-noise ratio of the voice channel of the current node to be larger than the preset threshold according to the corresponding relation between the bit signal-to-noise ratio and the coding code rate.
7. A codec control apparatus of an ad hoc network, the apparatus comprising:
the detection module is used for acquiring the channel capacity and the network delay of a voice channel of a current node when the current node is accessed to an adjacent node of the MESH network;
the processing module is used for determining the corresponding relation between the bit signal-to-noise ratio of the voice channel of the current node and the coding code rate of the voice signal;
and the control module is used for adjusting the coding rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the coding rate and controlling the network delay of the voice channel of the current node to be smaller than a preset duration.
8. The method of claim 7, wherein the detecting module is configured to obtain a channel capacity of a voice channel of the current node when the current node accesses a neighboring node of the MESH network, comprising:
acquiring the channel capacity of the voice channel of the current node according to the evaluation value of the channel capacity; and acquiring the network delay of the voice channel of the current node according to the evaluation value of the transmission delay.
9. The method of claim 7, wherein the processing module configured to determine a correspondence between a bit signal-to-noise ratio and a coding rate of a voice channel of a current node comprises:
determining the corresponding relation between the bit signal-to-noise ratio and the symbol signal-to-noise ratio according to the channel capacity of the current node;
and determining the corresponding relation between the bit signal-to-noise ratio of the voice channel of the current node and the coding code rate of the voice signal according to the corresponding relation between the bit signal-to-noise ratio and the symbol signal-to-noise ratio.
10. An electronic device, the electronic device comprising: a memory and a processor; the memory is used for storing computer instructions; the processor is configured to perform the codec control method of the ad hoc network according to any one of the preceding claims 1-6.
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