CN102890934B - Multi-channel duplex vocoder and multi-channel duplex vocoder system - Google Patents
Multi-channel duplex vocoder and multi-channel duplex vocoder system Download PDFInfo
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Abstract
The invention provides a multi-channel duplex vocoder. Data coding and decoding are performed by the high processing capacity of a digital signal processor and the input and the output of data are performed by virtue of a multi-channel buffered serial port. The transmission data frame which is transmitted by the multi-channel buffered serial port comprises a plurality of input/output control command fields, input/output pulse-code modulation (PCM) voice data fields and input/output data fields which are respectively corresponding to multi-channel input/output data one to one. Thus, the coding/decoding results of multi-channel acoustic code data can be recorded in a transmission data frame, the transmission mode of the multi-channel duplex vocoder is simplified and the multi-channel duplex vocoder is realized. In addition, the control thereof is realized by the input/output control command field in the transmission data frame, thus the control method is simplified, the working efficiency of the multi-channel duplex vocoder is increased. The invention also provides a multi-channel duplex vocoder system, comprising at least two multi-channel duplex vocoders which are in parallel connection.
Description
Technical field
The present invention relates to the technical field of vocoder, particularly relate to a kind of multichannel duplex vocoder, and a kind of multichannel duplex vocoder system.
Background technology
Vocoder is a kind of speech to be analyzed and synthetic coder, also claims speech analysis-synthesis system or voice band compressibility, is compressed voice communication band and the powerful that carries out secret communication.The advantage of vocoder is that numeric code rate is low, the code check of vocoder has dropped to 2400bps or 1200bps at present, even lower, being suitable for arrowband communicates by letter with the digital voice under noisy channels condition, especially under channel width confined condition, use vocoder can realize low rate, maintain secrecy and have the Speech Communication of certain antijamming capability.Vocoder is mainly used in the occasion that military antijam communication, government department's secret communication and those are worth paying a price to exchange for communication security.
According to the difference of principle of work, vocoder can be divided into: retain the compression frequency band vocoder of sound and sound channel main parameters, adopt spectrum envelope and the fundamental frequency channel vocoder as parameter; With the formant vocoder of position, amplitude and the width means spectrum envelope of resonance peak; The voice-excited vocoder of direct coding and transporting speech base band, phase vocoder, lipreder etc.
The Full Duplex Vocoder of multichannel is applicable to the audio coding module of broadcasting station equipment or the voice gateway of internet controller uses, for realizing between wireless sub network, between wireless and cable network and the internetwork speech transfering the letter of different speech system.But the Full Duplex Vocoder of multichannel need to be encoded to each road voice signal, because encoding calculation amount is large, control relative complex, be often difficult to realize.
Summary of the invention
For the problem existing in above-mentioned background technology, the object of the present invention is to provide a kind of coding and the control mode that can simplify multiple signals, improve the multichannel duplex vocoder of vocoder work efficiency, and a kind of multichannel duplex vocoder system.
A kind of multichannel duplex vocoder, comprises digital signal processor and multichannel buffered serial port, and described digital signal processor is connected with described multichannel buffered serial port;
Described multichannel buffered serial port is for input or output transmitting data frame; Wherein, described transmitting data frame comprises multiple input of control commands fields, multiple input PCM voice data field, multiple input acoustic code words data field, multiple output control command fields, multiple output PCM voice data field and multiple output acoustic code words data field, difference corresponding multichannel input/output data one by one;
In input channel, described digital signal processor obtains the described transmitting data frame of input from described multichannel buffered serial port, according to the described input of control commands field in the described transmitting data frame of input, described input PCM voice data field is carried out and encoded and be converted to corresponding acoustic code words data, or described input acoustic code words data field is carried out and decoded and convert corresponding PCM speech data to;
In output channel, described digital signal processor generates described output acoustic code words data field according to described acoustic code words data to be exported, or generate described output PCM voice data field according to described PCM speech data to be exported, and generate corresponding output control command field, to the corresponding described transmitting data frame of described multichannel buffered serial port output.
Multichannel duplex vocoder of the present invention carries out data encoding and decoding by the high throughput of digital signal processor (DSP, Digital Signal Processing), and a described multichannel buffered serial port transmission is all passed through in the input and output of data.Described transmitting data frame comprises multiple I/O control command fields, I/O PCM voice data field, I/O acoustic code words data field, difference corresponding multichannel input/output data one by one.In the time of input, described digital signal processor is acoustic code words data or PCM speech data according to the multichannel data of described input of control commands field judgement input, or encoding operation or decode operation are carried out in judgement; If input acoustic code words data, the corresponding decode operation of carrying out, in the words of the input acoustic code in described transmitting data frame data field, obtain the acoustic code words data of input and decode, then PCM speech data decoding being obtained forms the output PCM voice data field of described transmitting data frame, exports described transmitting data frame by described multichannel buffered serial port; If input is PCM speech data, the corresponding encoding operation of carrying out, in the input PCM voice data field in described transmitting data frame, obtain the PCM speech data of input and carry out feature extraction coding, then the acoustic code words data that coding obtained form the output acoustic code words data field of described transmitting data frame, export described transmitting data frame by described multichannel buffered serial port.
Therefore, can in a transmitting data frame, record multi-Channel Acoustic code data is carried out to coding/decoding result, simplify the transmission mode of multichannel duplex vocoder, realize the vocoder of multichannel duplex; And it is controlled all and realizes by the I/O control command word in described transmitting data frame, has also simplified control mode, improve multichannel duplex vocoder work efficiency.
The present invention also provides a kind of multichannel duplex vocoder system, and described multichannel duplex vocoder system comprises at least two multichannel duplex vocoders of the present invention, and described at least two multichannels duplex vocoder is in parallel mutually.
Multichannel duplex vocoder system of the present invention comprises the multichannel duplex vocoder of two above parallel connections mutually, can be to more multichannel PCM speech data or acoustic code words data are processed simultaneously, there is larger processing power, be more suitable for the more situation of input data.
Brief description of the drawings
Fig. 1 is the structural representation of multichannel duplex vocoder of the present invention the first embodiment;
Fig. 2 is the structural representation of multichannel duplex vocoder of the present invention the second embodiment;
Fig. 3 is the structural representation of multichannel duplex vocoder system of the present invention.
Embodiment
Refer to Fig. 1, Fig. 1 is the structural representation of multichannel duplex vocoder of the present invention the first embodiment.
Described multichannel duplex vocoder 10 comprises: digital signal processor 11(DSP, Digital Signal Processing) and multichannel buffered serial port 12(McBSP, Multichannel Buffered Serial Port), described digital signal processor 11 is connected with described multichannel buffered serial port 12.
Described multichannel buffered serial port 12 is for input or output transmitting data frame; Wherein, described transmitting data frame comprises multiple input of control commands fields, multiple input PCM voice data field, multiple input acoustic code words data field, multiple output control command fields, multiple output PCM voice data field and multiple output acoustic code words data field;
In input channel, described digital signal processor 11 obtains the described transmitting data frame of input from described multichannel buffered serial port 12, according to described input of control commands field, described input PCM voice data field is carried out and encoded and be converted to corresponding acoustic code words data, or described input acoustic code words data field is carried out and decoded and convert corresponding PCM speech data to;
In output channel, described digital signal processor 11 generates described output acoustic code words data field according to described acoustic code words data to be exported, or generate described output PCM voice data field according to described PCM speech data to be exported, and generate corresponding output control command field, described multichannel buffered serial port 12 is exported to corresponding described transmitting data frame.
Described multiple I/O control command field, I/O PCM voice data field, I/O acoustic code words data field, difference corresponding multichannel input/output data one by one.
The transmitting data frame of described input channel and the transmitting data frame of described output channel can be by the mode of time division duplex via described multichannel buffered serial port 12 input and output.
Describe the workflow of described multichannel duplex vocoder below in detail:
In input channel, described multichannel buffered serial port 12 can either be inputted PCM speech data (Pulse-code modulation, pulse code modulation (PCM)) by described transmitting data frame, also can input acoustic code words data.If input PCM speech data, the described input acoustic code words data field in the described transmitting data frame of input is empty, and described input PCM voice data field is not empty; If input is acoustic code words data, contrary.
Whether described digital signal processor 11 has judged whether that according to the input of control commands field in the described transmitting data frame of input the input of PCM speech data needs coding, have the input of acoustic code words data to need decoding.For example, described input of control commands field is 1, what represent input is PCM speech data, need to carry out feature extraction encoding operation, in the input PCM voice data field of the described transmitting data frame of inputting, obtains the PCM speech data of input and carries out feature extraction coding; Described input of control commands field is 0, and what represent input is acoustic code words data, need to carry out decode operation, in the input acoustic code words data field in described transmitting data frame, obtains the acoustic code words data of input and decodes.The data that obtain after described execution coding or decode operation can be stored in the reservoir of described digital signal processor 11, or are stored in special data storage, for example, in Flash reservoir, as data to be exported.
And in output channel, described digital signal processor 11 takes out data described to be exported from reservoir, if to be exported is PCM speech data, the transmitting data frame of output being generated to described output control command field is 1, and export by waiting the output PCM voice data field that described PCM speech data forms described transmitting data frame, export described transmitting data frame by described multichannel buffered serial port; If to be exported is acoustic code words data, the transmitting data frame of output being generated to described output control command field is 0, and described acoustic code to be exported is talked about to the output acoustic code words data field that data form described transmitting data frame, export described transmitting data frame by described multichannel buffered serial port 12.
Can realize by the way the acoustic code words data decode to multichannel simultaneously or the processing of PCM encoded speech data, and the data of input and output are by unified transmitting data frame carrying, only need to use a described multichannel buffered serial port 12 just can realize the input and output of data, hardware unit is simpler.Simplify the transmission mode of multichannel duplex vocoder, realize multichannel duplex vocoder; And it is controlled all and realizes by the I/O control command word in described transmitting data frame, has also simplified control mode, improve described multichannel duplex vocoder 10 work efficiencies.
A kind of preferred constituted mode of described transmitting data frame is provided below, to more reasonably arrange input and output, reduces the resource occupation to channel in transmitting procedure.Described transmitting data frame comprises 32 time slots, each time slot 8 bits, and the 0th to 3 time slots are reserved time slot, and the 4th to 15 time slots are front 4 channel time slots, and the 16th to 19 time slots are reserved time slot, and the 20th to 31 time slots are rear 4 channel time slots; Wherein, described front 4 channel time slots and described after 4 channel time slot every road include a control slot, PCM letter code time slot and an acoustic code words letter code time slot, described control slot inputs or outputs control command field for carrying, described PCM letter code time slot inputs or outputs PCM voice data field for carrying, and described acoustic code words letter code time slot inputs or outputs acoustic code words data field for carrying.
Further, the frame-synchronizing impulse rising edge that described transmitting data frame can be set aligns with the 8 bits rising edge of the 31st time slot, and described frame-synchronizing impulse width is 1 bit period.To realize better the synchronous transmission of input data and output data.
FSX, FSR, CLKX, the CLKR of described multichannel buffered serial port are provided by user's mainboard, and wherein FSR, FSX and CLX, CLR can share respectively a signal.
Above-mentioned multichannel duplex vocoder 10, the PCM voice signal of the 64kbps restraining at transmission path Ke Jiang tetra-road A carries out acoustic code words coding, generates the digital voice signal of 1.2kbps or 2.4kbps; Meanwhile, in receiving path, the digital voice signal of four road 1.2kbps or 2.4kbps, through the acoustic code words decoding of described digital signal processor 11, is reduced to the PCM voice signal of the 64kbps of four road A rules.By the high-speed computation of described digital signal processor 11, encoding and decoding process is carried out simultaneously, can meet the requirement of four tunnel duplex Speech Communications simultaneously.Described multichannel duplex vocoder 10 possesses compressed encoding transmission, transfering the letter, the secret communication function of speech, can serve as the audio coding module of broadcasting station equipment or the voice gateway of internet controller and use.
Use single dsp processor to realize the conversion between multichannel PCM voice and multichannel acoustic code words speech, making becomes possibility based on the multi-path voice transmission of acoustic code words coding with exchange.It should be noted that, user can use the parallel connection of multiple multichannel duplex vocoder of the present invention, thereby realizes 8 tunnels, 16 tunnels, even more multi duplexing acoustic code words data transmission and exchange.Because the bandwidth that the acoustic code of 2.4kbps words data take is only 1/26 of the PCM voice data of 64k, and the bandwidth that the acoustic code of 1.2kbps words data take is only 1/53 of the PCM voice data of 64k.Compare the exchange of PCM voice data, acoustic code words data are more prone to carry out the encrypted transmission of packet message, carry out secure voice communication for needs, use multichannel duplex vocoder of the present invention to be one and well select.
As a kind of preferred implementation, described digital signal processor 11 comprises EDMA controller (EDMA Enhanced Direct Memory Access, enhancement mode direct memory access), described EDMA controller is for carrying out the immediate data interactive operation between described multichannel buffered serial port and the internal memory of described digital signal processor.Realize the EDMA transmitting-receiving of described multichannel buffered serial port 12 is processed, the tissue of making a start output control command word, PCM voice data and acoustic code words data, receiving end is resolved input of control commands word, PCM voice data, is received acoustic code words data.Realized the internal memory SRAM(Static RAM of described multichannel buffered serial port 12 and described digital signal processor 11 by configuration EDMA controller) between immediate data mutual, after 32 time slots of each like this transmitting data frame send or finish receiving, described EDMA controller is kept at the data of described multichannel buffered serial port 12 in sram memory automatically, then interrupt described digital signal processor 11 once, so just avoided described multichannel buffered serial port 12 frequently to interrupt the encoding and decoding computing of described digital signal processor 11.
Preferably, described digital signal processor 11 can further receive the instruction of speech coding pattern configurations from described multichannel buffered serial port 12, change the coding mode to described input PCM voice data field according to described speech coding pattern configurations instruction, described coding mode comprises 2.4kbps, 1.2kbps.By the described speech coding pattern configurations instruction of configure dedicated, user can be according to current channel capacity situation, and changing speech coding pattern is 2.4kbps or 1.2kbps, to adapt to current channel situation.
Further, described digital signal processor 11 also can receive key from described multichannel buffered serial port 12 and inject instruction, the key that injects instruction injection according to described key is encrypted the data in channel, and decodes after the data that receive being decrypted according to described key again.By being set, described key injects instruction; injecting key is encrypted the acoustic code words voice data in channel; take over party decodes after to the deciphering of acoustic code words voice data; while only having receiving-transmitting sides key match; just can restore correct PCM speech, guarantee the confidentiality in voice data transmission process.
Further, when described digital signal processor 11 also can receive dormancy instruction from described multichannel buffered serial port 12, control described multichannel duplex vocoder 10 and enter dormant state.When in holding state, user can send instruction, makes vocoder enter dormant state, to save power consumption.
Refer to Fig. 2, Fig. 2 is the structural representation of multichannel duplex vocoder of the present invention the second embodiment.
Described multichannel duplex vocoder 10 also comprises the FALSH program storage chip 13, crystal oscillator 14, power-supplying circuit 15 and the reset circuit 16 that connect described digital signal processor 11; Described FALSH program storage chip 13 is for storing DSP medium program, and described crystal oscillator 14 is for synchronizing pulse is provided, and described power-supplying circuit 15 is for power supply is provided, and described reset circuit 16 is for carrying out reset operation.
Described multichannel duplex vocoder 10 is preferably made PCB printed circuit board, described digital signal processor 11, multichannel buffered serial port 12, FALSH program storage chip 13, crystal oscillator 14, power-supplying circuit 15 and reset circuit 16 are arranged on described PCB printed circuit board, by the connection of described PCB printed circuit board.In order to prevent the impact of vibrations (such as vehicle environment) on vocoder, described multichannel duplex vocoder 10 can arrange four location and installation holes, at four jiaos of described PCB printed circuit board, user can use screw that described multichannel duplex vocoder 10 is fastened on mainboard respectively.
Described digital signal processor 11 is core devices of described multichannel duplex vocoder 10, for realizing the conversion between the coding of PCM speech data and decoding, linear PCM and the ADPCM of acoustic code words voice data.
Described FALSH program storage chip 13, for storing DSP medium program, is preferably connected by EMIFA bus interface between described FALSH program storage chip 13 and described digital signal processor 11.After described digital signal processor 11 electrification resets, reside in boot in processor according to pin level state determining program load mode and large little endian mode, described digital signal processor 11 adopts FALSH loaded in parallel, little endian mode.
The present invention also provides a kind of multichannel duplex vocoder system, and as shown in Figure 3, described multichannel duplex vocoder system comprises at least two multichannel duplex vocoders 10 of the present invention, and described at least two multichannels duplex vocoder 10 is in parallel mutually.
Multichannel duplex vocoder system of the present invention comprises the multichannel duplex vocoder 10 of two above parallel connections mutually, can be to more multichannel PCM speech data or acoustic code words data are processed simultaneously, there is larger processing power, be more suitable for the more situation of input data.For example described multichannel duplex vocoder 10 is made into from plate mode, can adopt user's mainboard to form described multichannel duplex vocoder system to the mode of multiple slave plates.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a multichannel duplex vocoder, is characterized in that, comprise digital signal processor and multichannel buffered serial port, described digital signal processor is connected with described multichannel buffered serial port;
Described multichannel buffered serial port is for input or output transmitting data frame; Wherein, described transmitting data frame comprises multiple input of control commands fields, multiple input PCM voice data field, multiple input acoustic code words data field, multiple output control command fields, multiple output PCM voice data field and multiple output acoustic code words data field, difference corresponding multichannel input/output data one by one;
In input channel, described digital signal processor obtains the described transmitting data frame of input from described multichannel buffered serial port, according to the described input of control commands field in the described transmitting data frame of input, described input PCM voice data field is carried out and encoded and be converted to corresponding acoustic code words data, or described input acoustic code words data field is carried out and decoded and convert corresponding PCM speech data to;
In output channel, described digital signal processor generates described output acoustic code words data field according to described acoustic code words data to be exported, or generate described output PCM voice data field according to described PCM speech data to be exported, and generate corresponding output control command field, to the corresponding described transmitting data frame of described multichannel buffered serial port output.
2. multichannel duplex vocoder as claimed in claim 1, is characterized in that, described transmitting data frame comprises 32 time slots, each time slot 8 bits, the 0th to 3 time slots are reserved time slot, the 4th to 15 time slots are front 4 channel time slots, the 16th to 19 time slots are reserved time slot, and the 20th to 31 time slots are rear 4 channel time slots; Wherein, described front 4 channel time slots and described after 4 channel time slot every road include a control slot, PCM letter code time slot and an acoustic code words letter code time slot, described control slot inputs or outputs control command field for carrying, described PCM letter code time slot inputs or outputs PCM voice data field for carrying, and described acoustic code words letter code time slot inputs or outputs acoustic code words data field for carrying.
3. multichannel duplex vocoder as claimed in claim 2, is characterized in that, the frame-synchronizing impulse rising edge of described transmitting data frame aligns with the 8 bits rising edge of the 31st time slot, and described frame-synchronizing impulse width is 1 bit period.
4. multichannel duplex vocoder as claimed any one in claims 1 to 3, it is characterized in that, described digital signal processor comprises EDMA controller, and described EDMA controller is for carrying out the immediate data interactive operation between described multichannel buffered serial port and the internal memory of described digital signal processor.
5. multichannel duplex vocoder as claimed any one in claims 1 to 3, is characterized in that, described multichannel duplex vocoder also comprises the FALSH program storage chip, crystal oscillator, power-supplying circuit and the reset circuit that connect described digital signal processor;
Described FALSH program storage chip is used for storing DSP medium program, and described crystal oscillator is used for providing synchronizing pulse, and described power-supplying circuit is used for providing power supply, and described reset circuit is used for carrying out reset operation.
6. multichannel duplex vocoder as claimed any one in claims 1 to 3, it is characterized in that, described digital signal processor further receives the instruction of speech coding pattern configurations from described multichannel buffered serial port, change the coding mode to described input PCM voice data field according to described speech coding pattern configurations instruction, described coding mode comprises 2.4kbps, 1.2kbps.
7. multichannel duplex vocoder as claimed any one in claims 1 to 3, it is characterized in that, described digital signal processor further receives key from described multichannel buffered serial port and injects instruction, the key that injects instruction injection according to described key is encrypted the data in channel, and decodes after the data that receive being decrypted according to described key again.
8. multichannel duplex vocoder as claimed any one in claims 1 to 3, is characterized in that, when described digital signal processor further receives dormancy instruction from described multichannel buffered serial port, controls described multichannel duplex vocoder and enters dormant state.
9. a multichannel duplex vocoder system, is characterized in that comprising at least two multichannel duplex vocoders as described in claim 1 to 8 any one, and described at least two multichannels duplex vocoder is in parallel mutually.
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| EP1053612A1 (en) * | 1998-01-29 | 2000-11-22 | General DataComm, Inc. | Atm switch voice server module utilizing flag signalling |
| KR100478592B1 (en) * | 2000-11-25 | 2005-03-28 | 엘지전자 주식회사 | DSP Scheduling Control Method |
| CN1538315A (en) * | 2003-04-15 | 2004-10-20 | 华为技术有限公司 | Method of reducing data transmission delay in coding decoding process and its device |
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