CN1964471A - 2.4G public frequency band digital visual interphone and method to process audio image - Google Patents
2.4G public frequency band digital visual interphone and method to process audio image Download PDFInfo
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- CN1964471A CN1964471A CN 200610139143 CN200610139143A CN1964471A CN 1964471 A CN1964471 A CN 1964471A CN 200610139143 CN200610139143 CN 200610139143 CN 200610139143 A CN200610139143 A CN 200610139143A CN 1964471 A CN1964471 A CN 1964471A
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Abstract
The disclosed digital visible walkie-talkie applied 2.4G public frequency band comprises: a power circuit, a speech process circuit with a microphone and loudspeaker and a speech coding/decoding circuit, a video process circuit included a display device and a COMS camera both connected with CPU, a CPU, a RF transmitting-receiving circuit with a 2.4G frequency band transmitting-receiving chip and peripheral circuit to connect with CPU, and an antenna. This invention can transfer both speech and video information simultaneously for high quality multimedia effect with low cost, and fit to spread in large scale.
Description
Technical field
The present invention relates to a kind of wireless interspeaker, especially relate to a kind of 2.4G public frequency band digital visual intercom and phonetic image processing method.
Background technology
The present analog intercom in intercom market still occupies bigger proportion.Existing simulation intercom exists many shortcomings with not enough: one, what the simulation intercom transmitted is analog signal, and signal processing mode is simple, and consumed power is big, can not eliminate effectively and disturb and The noise, cause that speech quality can not be satisfactory under many situations; Its two, the simulation intercom frequency efficiency not high, channel capacity is low.Its three, simulation intercom confidentiality is poor, is eavesdropped easily.
The TETRA in the IDEN of the U.S. and Europe etc. has set up relevant digital intercommunication (cluster) standard, but these standards all need to take new radio frequency resources, and operating frequency is generally 800MHz, and needs the support of base station.Compare with the talkback system of routine, these digital systems are more complicated, and cost is also higher, generally only are suitable for some high-end application.And also do not have real digital handset standard at present in China.
Continuous development along with technology, succeeded in developing the digital visual intercom abroad, but China does not still have this digital visual intercom at present, the one, and some core technologies are all grasped in foreign corporation's hand, so difficult exploitation has the product of independent intellectual property right; The 2nd, this digital visual intercom technical sophistication, cost is higher, is difficult to large-scale promotion application.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of speech quality height at above-mentioned prior art present situation, and anti-interference is good, and low cost of manufacture is suitable for the digital visual intercom and the phonetic image processing method of the 2.4G common frequency band of large-scale promotion application.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of digital visual intercom of 2.4G common frequency band, it comprises power circuit, speech processing circuit, video processing circuits, central processing unit and the radio-frequency (RF) transmit-receive circuit and the antenna that are connected with described central processing unit, described speech processing circuit comprises microphone, loud speaker and the encoding and decoding speech circuit that is connected with described central processing unit, described microphone is connected described encoding and decoding speech circuit respectively with described loud speaker, described video processing circuits comprises display unit and the COMS camera that is connected with described central processing unit respectively, and described radio-frequency (RF) transmit-receive circuit is made up of 2.4GHz frequency band digital transceiving chip and peripheral circuit.
Described encoding and decoding speech circuit is made up of duplex voice chip and peripheral circuit.
Described central processing unit is for supporting the ARM9 processor of LINUX operating system.
The wireless working frequency points of described radio-frequency (RF) transmit-receive circuit is 2402.304MHz～2482.176MHz, and channel spacing is 2MHz, and the number of channel is 40.
Described central processing unit can also be connected with the keyboard input circuit.
Described central processing unit also can also be provided with shelf storage.
A kind of phonetic image processing method of digital visual intercom of 2.4G common frequency band, it comprises emission digital speech picture signal and receives two treatment steps of digital speech picture signal, described emission digital speech picture signal treatment step is: described encoding and decoding speech circuit carries out analog-to-digital conversion and compressed encoding to the voice signal of described microphone output, then the audio digital signals behind the compressed encoding is sent to described central processing unit and carries out Base-Band Processing, described COMS camera is sent to described central processing unit with the data image signal that receives and carries out compressed encoding and Base-Band Processing; Sending the phonetic image signal after the Base-Band Processing to described radio-frequency (RF) transmit-receive circuit then launches by described antenna; Described reception digital speech picture signal treatment step is: described radio-frequency (RF) transmit-receive circuit demodulates baseband signal with the signal that described antenna receives, carry out the base band demodulating processing after being sent to described central processing unit again, then the audio digital signals behind the base band demodulating is sent to described encoding and decoding speech circuit and sends described loud speaker to through decompress(ion) and digital-to-analogue conversion, the data image signal of described central processing unit after to base band demodulating carries out decompression processing, then the data image signal behind the decompress(ion) is sent to display unit.
Compared with prior art, the invention has the advantages that and to transmit voice, video information simultaneously at the digital visual intercommunication function of realizing the 2.4G common frequency band, realize multimedia communication; Its speech quality height, anti-interference is good, and low cost of manufacture is suitable for large-scale promotion application; Encoding and decoding can realize simultaneously when the duplex voice chip was in running order, were sampled as 8KHz, and the voice transmit data rate is 16kBps; Support the ARM9 chip of LINUX operating system can be in real time, fast processing and control mass data, voice, video information; The keyboard input circuit is set realizes Short Message Mobile Originated; Shelf storage then can be used to back up needed various data.The present invention adopts the public frequency range of ISM, but the frequency spectrum resource of saves valuable; Simultaneously,,, exempt from the frequency occupancy, reduced the cost of system as long as technical parameters such as transmitting power meet the related request of radio administration owing to be to work in common frequency band; Radio-frequency (RF) transmit-receive circuit of the present invention adopts the integrated transmission circuit of monolithic, and peripheral component is few, has that strong interference immunity, speech quality are good, a good confidentiality, availability of frequency spectrum height, little, low in energy consumption, the degree of integration advantages of higher of volume.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is the flow chart of processing method of the present invention;
Fig. 3 is the whole call flows figure of travelling carriage of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing.
Embodiment one: a kind of digital visual intercom of 2.4G common frequency band, comprise power circuit 1, central processing unit 2, encoding and decoding speech circuit 3, microphone 4, loud speaker 5, COMS camera 6, display unit 7, radio-frequency (RF) transmit-receive circuit 8 and antenna 9, power circuit 1 is a power supply arbitrarily of the prior art, can be each circuit provides galvanic current to press, encoding and decoding speech circuit 3 is made up of duplex voice chip and the peripheral circuit of the CMX649 of CML Microcircuits company, CMX649 is the encoding/decoding mode of full duplex, support the 16-128Kbps processing speed and support ADM and CVSD, Linear-PCM, u-law PCM, codings such as A-law PCM, filtering and gain all can have programming to control, inside comprises an amplifier of microphone, digital dock is proofreaied and correct, data-measuring and de-quantization and provide programmable sound size detection (VAD) so that the user can adjust threshold value and economize power supply in the low signal time, provide inner or outside sampling clock to select, sample frequency is 8KHz, provide microphone input is encoded and ADC, the decoding and the DAC of audio frequency output, for baseband processor provides audio digital signals, and can carry out digital delay to signal, microphone 4 is connected encoding and decoding speech circuit 3 respectively with loud speaker 5; COMS camera 6 is the CMOS chip of OV6620 for the model of OmniVision technology Co., Ltd, this CMOS image chip is powerful, comprise the function that camera system is all: automatic exposure, the electronics convergent-divergent, white balance, coloud coding, analog-to-digital conversion, noise suppression or the like, all be integrated in the chip, realize highly integrated the time, still keep than all lower power consumption of any competing product on the market, OV6620 is a single-chip, high performance video image and little packaged device are provided, its can per second catches resolution is that 352 * 288 image rate was 60 frame/seconds, utilize the integrated chip technology of special advanced algorithm to solve fixed pattern noise (FPN), eliminated stain, significantly reduced blooming, OV6620 also provides programmable SCCB interface, by programming, can provide 4-bit, the image output format of 8-bit or 16-bit digital form; Display unit 7 is the LCD with drive circuit, central processing unit 2 is that the model of MOTOROLA company is the ARM9 processor of the 32bit of MC9328MX21, have ARM9 kernel and high integrated system function, high primary frequency can reach 200MHZ, have the cache memory (cache) of 16Kbit instruction and 16Kbit data and write buffering, inner integrated module has LCD control, static RAM (SRAM), USB interface, A/D, MMC/SD, blue tooth interface, SSI/I
2S, VEDIO interface, two timers; Radio-frequency (RF) transmit-receive circuit 8 is made up of chip and the peripheral circuit of the ML2724 of micro linear company, ML2724 is the general GFSK modulation wireless transceiver of transmitting-receiving that is used for digital telephone, its working frequency range is from 2.4G to 2.5GHz, all frequency generations that this device is integrated, receive and transfer function, a programmable control interface is provided, can set mode of operation, power amplifier (PA) and LNA circuit (LNA) that control is outside, and provide the interface of different baseband processor, monitor transmitting-receiving power by the RSSI module, send and receive the fsk data that can reach 1.536Mbps, channel spacing is 2.048MHz, support DSSS, the mode of operation of FHSS and FSK, receiving sensitivity can reach-90dBm, therefore make the wireless working frequency points of radio-frequency (RF) transmit-receive circuit 8 be in 2402.304MHz～2482.176 MHz, channel spacing is 2MHz, and the number of channel is 40.
Above-mentioned digital visual intercom emission digital speech picture signal treatment step is: the voice signal that 3 pairs of microphones of encoding and decoding speech circuit 4 receive carries out analog-to-digital conversion and compressed encoding, then the audio digital signals behind the compressed encoding is sent to central processing unit 2 and carries out Base-Band Processing, COMS camera 6 is sent to central processing unit 2 with the data image signal that receives and carries out compressed encoding and Base-Band Processing; Sending the phonetic image signal after the Base-Band Processing to radio-frequency (RF) transmit-receive circuit 8 then launches by antenna 9; Receiving digital speech picture signal treatment step is: radio-frequency (RF) transmit-receive circuit 8 is carried out demodulation with antenna 9 received signals, baseband signal after the demodulation is sent to central processing unit 2 carries out the base band demodulating processing, then the audio digital signals behind the base band demodulating is sent to encoding and decoding speech circuit 3 and sends loud speaker 5 to through decompress(ion) and digital-to-analogue conversion, data image signal behind 2 pairs of base band demodulatings of central processing unit carries out decompression processing, then the data image signal behind the decompress(ion) is sent to display unit 7.
Embodiment two: other structure is identical with embodiment one, and difference is that central processing unit 2 also is connected with keyboard input circuit 10.
Embodiment three: other structure is identical with embodiment two, and difference is that central processing unit 2 also is provided with shelf storage 11.
Each chip in the foregoing description all can substitute with other chip with identical function.
Mechanism of the present invention is as follows: (1) caller part: in grouping busy realization, press the PTT key, detect to group busy whether channel (f0) is occupied immediately, and occupied then warning, otherwise just obtain to group busy the channel right to use; Next pilot signal transmitted a period of time immediately, send out synchronizing signal a period of time again; Below just the usefulness around the acquiescence exhale the user synchronous with main per family, so mainly exhale the user can carry out phonetic image communication.Finish Shi Zezai by the PTT key, channel is discharged, other user can seize use.In achieving paging, at first be exactly dialing (by a user identification code in the lower network), promptly begin to search for the paging channel (idle channel among the f1～f8), can begin pilot signal transmitted a period of time after searching, send synchronizing channel a period of time again, the user who allows in these channel cocycles search and you are synchronous, and then identifier a period of time of transmission the other side, wait for that (discovery has caller identification to the other side's response, and press definite key, send acknowledge message exactly to the calling party), next can communicate.Hang up realization: press definite key, promptly discharge the channel that is now just using, change listening state over to.(2) called part: in grouping busy realization, any phone all is cyclic search paging signals in f0～f8, in case receive the pilot signal on the channel f0, then locks this channel and synchronous with it at once, the back receives identifier (constant mark), waits for that subsequently receiving the calling party sends information.(divide three kinds of situations: 1. group busy channel, then be exactly in 2. information on the paging channel of this intercept communications information, the identifier that the other side sends conforms to own control, then just send and determine that information is to 3. information on the paging channel of the other side, the identifier that the other side sends does not conform to self, then with regard to return to search).Just decide the job placement of back by the judgement of identifier.In achieving paging, any phone all is cyclic search paging signals in f0～f8, in case receive the pilot signal on channel f1～f2, then lock this channel and synchronous with it at once, the back receives identifier, and (in two kinds of situation: 1. the identifier that sends of calling party conforms to own control, then just send and determine information to 2. information on the paging channel of the other side, the identifier that the other side sends does not conform to self, then with regard to return to search).Just decide the job placement of back by the judgement of identifier: the situation of 1. planting is then just carried out intercommunication; 2. plant situation then with regard to return to search.The foregoing circuit connection features is: 1) control circuit links to each other with the programming input control mouth of radio frequency chip by the data communication mouth of transmitting-receiving control unit with MCU, realizes the selection that MCU input control radio frequency chip modulation transmitting-receiving frequency and transmission still receive; 2) each links to each other by some control circuit with the data communication mouth and rectangle keyboard input circuit of MCU by data wire, realizes MCU reception key in data; 3) control circuit receives the input of keyboard, and some system modes are shown by liquid crystal display screen.4) link to each other with the reading and writing data mouth with the address wire mouth of memory chip with data wire by address wire, realize both exchanges data; 5) control circuit links to each other with power circuit by power line.
The whole call flows of travelling carriage as shown in Figure 3.
In the call flow, relate to pilot tone, synchronous, signaling (identification code, confirmation code, communication disruption sign indicating number) altogether, all belong to the control time slot.
1. pilot signal does not comprise any information, and synchronizing signal only is provided, and supplies the recipient to gather carrier phase reference required when obtaining coherent demodulation, knows that the PN sequence gets final product.
2. synchronizing channel comprise in have: the side-play amount of the PN pseudo-code sequence of calling party's identifier and this phone
| Frame head | Message length | The information content | The CRC check | The residue zero padding |
1bit 8bit I 16bit
3. control signaling (being used for transport service and data information in addition)
| Frame head | Message length | The information content | The CRC check | The residue zero padding |
1bit 8bit I 16bit
Business and data information frame belong to communication time slot.
Here mainly be exactly that how timesharing is transmitted for specified image and voice.
Claims (7)
1, a kind of digital visual intercom of 2.4G common frequency band, it is characterized in that it comprises power circuit, speech processing circuit, video processing circuits, central processing unit and the radio-frequency (RF) transmit-receive circuit and the antenna that are connected with described central processing unit, described speech processing circuit comprises microphone, loud speaker and the encoding and decoding speech circuit that is connected with described central processing unit, described microphone is connected described encoding and decoding speech circuit respectively with described loud speaker, described video processing circuits comprises display unit and the COMS camera that is connected with described central processing unit respectively, and described radio-frequency (RF) transmit-receive circuit is made up of 2.4GHz frequency band digital transceiving chip and peripheral circuit.
2, the digital visual intercom of 2.4G common frequency band as claimed in claim 1 is characterized in that described encoding and decoding speech circuit is made up of duplex voice chip and peripheral circuit.
3, the digital visual intercom of 2.4G common frequency band as claimed in claim 1 is characterized in that described central processing unit is for supporting the ARM9 processor of LINUX system.
4, as digital visual intercom according to the described 2.4G common frequency band of claim 1, it is characterized in that the wireless working frequency points of described radio-frequency (RF) transmit-receive circuit is 2402.304MHz～2482.176MHz, channel spacing is 2MHz, the number of channel is 40.
5, the digital visual intercom of 2.4G common frequency band as claimed in claim 1 is characterized in that described central processing unit also is connected with the keyboard input circuit.
6, the digital visual intercom of 2.4G common frequency band as claimed in claim 1 is characterized in that described central processing unit also is provided with shelf storage.
7, the phonetic image processing method of the digital visual intercom of 2.4G common frequency band as claimed in claim 1, it is characterized in that it comprises emission digital speech picture signal and receives two treatment steps of digital speech picture signal, described emission digital speech picture signal treatment step is: described speech processing circuit carries out analog-to-digital conversion and compressed encoding to the voice signal that described microphone receives, then the audio digital signals behind the compressed encoding is sent to described central processing unit and carries out Base-Band Processing, described COMS camera is sent to described central processing unit with the data image signal that receives and carries out compressed encoding and Base-Band Processing; Sending the phonetic image signal after the Base-Band Processing to described radio-frequency (RF) transmit-receive circuit then launches by described antenna; Described reception digital speech picture signal treatment step is: described radio-frequency (RF) transmit-receive circuit demodulates baseband signal with the signal that described antenna receives, carry out the base band demodulating processing after being sent to described central processing unit again, then the audio digital signals behind the base band demodulating is sent to described encoding and decoding speech circuit and sends described loud speaker to through decompress(ion) and digital-to-analogue conversion, the data image signal of described central processing unit after to base band demodulating carries out decompression processing, then the data image signal behind the decompress(ion) is sent to display unit.
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| CN 200610139143 CN1964471A (en) | 2006-01-05 | 2006-10-13 | 2.4G public frequency band digital visual interphone and method to process audio image |
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| CN 200610139143 CN1964471A (en) | 2006-01-05 | 2006-10-13 | 2.4G public frequency band digital visual interphone and method to process audio image |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951501A (en) * | 2010-10-09 | 2011-01-19 | 深圳市泛海三江电子有限公司 | Analog-digital mixed talkback indoor unit based on analog bus |
| CN101866651B (en) * | 2009-04-15 | 2012-02-22 | 陈伟江 | Method for implementing voice integrated circuit |
| CN102739277A (en) * | 2012-07-06 | 2012-10-17 | 常熟市方园纺织器材厂 | Multifunctional interphone |
| CN102780667A (en) * | 2011-05-13 | 2012-11-14 | 北京联拓恒芯科技发展有限公司 | Method and equipment for modulating physical layer of digital interphone |
| CN102821204A (en) * | 2012-08-10 | 2012-12-12 | 南京森林警察学院 | Portable multimedia communication device and application of portable multimedia communication device |
| CN102957448A (en) * | 2012-11-14 | 2013-03-06 | 华侨大学 | Digital interphone with Bluetooth function |
| WO2014005413A1 (en) * | 2012-07-03 | 2014-01-09 | 深圳九洲海全通科技股份有限公司 | Wireless control hand microphone |
| CN103888727A (en) * | 2014-03-12 | 2014-06-25 | 上海昕芯电子科技有限公司 | Digitalized wireless visual vehicle backing system and transmission method thereof |
| CN103944600A (en) * | 2014-04-18 | 2014-07-23 | 天津七一二通信广播有限公司 | Terminal based on ISM communication frequency band |
| CN106330237A (en) * | 2016-10-18 | 2017-01-11 | 深圳市大语科技有限公司 | Narrow-band wireless digital speech time division duplex intercom system |
| CN106961587A (en) * | 2017-04-27 | 2017-07-18 | 泰州市永正救护装备有限公司 | Double-directional speech high-resolution wireless digital graphic transmission equipment |
| CN110380753A (en) * | 2019-07-05 | 2019-10-25 | 浙江大华技术股份有限公司 | A kind of intercom and intercom system |
| CN110876098A (en) * | 2018-08-31 | 2020-03-10 | Oppo广东移动通信有限公司 | Audio processing method and electronic equipment |
| CN112954253A (en) * | 2021-03-29 | 2021-06-11 | 广州慧睿思通科技股份有限公司 | Intercom |
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2006
- 2006-10-13 CN CN 200610139143 patent/CN1964471A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101866651B (en) * | 2009-04-15 | 2012-02-22 | 陈伟江 | Method for implementing voice integrated circuit |
| CN101951501A (en) * | 2010-10-09 | 2011-01-19 | 深圳市泛海三江电子有限公司 | Analog-digital mixed talkback indoor unit based on analog bus |
| CN102780667A (en) * | 2011-05-13 | 2012-11-14 | 北京联拓恒芯科技发展有限公司 | Method and equipment for modulating physical layer of digital interphone |
| WO2014005413A1 (en) * | 2012-07-03 | 2014-01-09 | 深圳九洲海全通科技股份有限公司 | Wireless control hand microphone |
| CN102739277A (en) * | 2012-07-06 | 2012-10-17 | 常熟市方园纺织器材厂 | Multifunctional interphone |
| CN102821204A (en) * | 2012-08-10 | 2012-12-12 | 南京森林警察学院 | Portable multimedia communication device and application of portable multimedia communication device |
| CN102957448A (en) * | 2012-11-14 | 2013-03-06 | 华侨大学 | Digital interphone with Bluetooth function |
| CN103888727A (en) * | 2014-03-12 | 2014-06-25 | 上海昕芯电子科技有限公司 | Digitalized wireless visual vehicle backing system and transmission method thereof |
| CN103944600A (en) * | 2014-04-18 | 2014-07-23 | 天津七一二通信广播有限公司 | Terminal based on ISM communication frequency band |
| CN106330237A (en) * | 2016-10-18 | 2017-01-11 | 深圳市大语科技有限公司 | Narrow-band wireless digital speech time division duplex intercom system |
| CN106961587A (en) * | 2017-04-27 | 2017-07-18 | 泰州市永正救护装备有限公司 | Double-directional speech high-resolution wireless digital graphic transmission equipment |
| CN110876098A (en) * | 2018-08-31 | 2020-03-10 | Oppo广东移动通信有限公司 | Audio processing method and electronic equipment |
| CN110876098B (en) * | 2018-08-31 | 2022-01-11 | Oppo广东移动通信有限公司 | Audio processing method and electronic equipment |
| CN110380753A (en) * | 2019-07-05 | 2019-10-25 | 浙江大华技术股份有限公司 | A kind of intercom and intercom system |
| CN112954253A (en) * | 2021-03-29 | 2021-06-11 | 广州慧睿思通科技股份有限公司 | Intercom |
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