CN101282497A - Apparatus for arbitrarily switching and mixing sound for multipath audio - Google Patents
Apparatus for arbitrarily switching and mixing sound for multipath audio Download PDFInfo
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Abstract
The invention relates to multi-path audio random exchanging and mixing device, which belongs to the field of electronic digital data processing technology and consists of a server PC, a master control machine and a terminal machine. The server PC is a computer with USB interfaces, which sets system parameters and data; the master control machine is integrated with a USB interface chip and multiple FPGA chips which are connected with each other through signal wires, the master control machine builds communication with the server PC, collects audio data of the terminal, transmits audio data to the terminal machine, switches and mixes multi-path audio data, drives the terminal machine; the terminal employs the FPGA chips as main device and is externally connected with a microphone, earphones and line audio frequency input, which outputs the received audio signal to earphones and transmits the microphone audio frequency and the line audio frequency input to the master control machine. The device of the invention can be applied to occasions like language lab, music teaching and making, conference simultaneous interpretation and telephone voice switching.
Description
Technical field:
The invention belongs to electric numerical data processing technology field, especially relate to and a kind ofly can exchange the device of audio mixing arbitrarily 64 tunnel audio signals.Can be applicable to language laboratory, music teaching, making, meeting simultaneous interpretation, occasions such as call voice exchange.
Background technology:
Traditional audio exchange equipment for example is applied to the electronic equipment of language laboratory, use be Analog Electronics Technique.Usually, such equipment comprises teacher's control desk and several student terminals, and the voice messaging of Faculty and Students transmits by the analog signal of electronics and switches.Because adopt the analog signal technology, there are many shortcomings in this type of device, for example Mo Ni voice signal is subjected to electromagnetic interference easily; Voice recording need pass through the tape mode, is difficult for preserving or the like.
Along with the development of digital circuit technique in recent years, some digital speech switching equipment have appearred on the market, and its main application fields also is voice, music teaching laboratory.These products have solved analog signal and have been subject to disturb, problems such as voice inconvenience preservation, but the general network that is based on that adopts of this kind equipment connects, the method for software operation.Specifically, use the network switch to connect between each voice terminal of this kind equipment based on Ethernet, voice signal is handled through a station server (for example home computer), operates in the function of exchange that software on the server is finished each road voice signal.The shortcoming of this type of device is that mainly server handling ability is limited, and equipment can only be finished the part function of exchange of voice signal, and for example same time can only select some or limited several voice terminals as source of sound.Simultaneously, if audio signal quality is high more, the voice data rate is then high more, is subject to processing the device limited processing ability, and the audio quality of equipment and the voice frequency terminal quantity that can drive are all limited.
Summary of the invention:
The purpose of this invention is to provide a kind of multipath audio signal that can make and exchange arbitrarily simultaneously, arbitrarily the device of audio mixing, playback, recording.
In order to reach the foregoing invention purpose, a kind of multichannel voice frequency of the present invention exchanges arbitrarily, the device of audio mixing mainly is made up of server PC, main control computer and terminating machine.Server PC is a computer that has USB interface, is responsible for being provided with system parameters, and exchange, audio mixing pattern are provided with, playback, recording and the button of resolving terminal, the liquid crystal display screen displaying contents of control terminal; Main control computer is integrated with the USB interface chip, also be integrated with one or more pieces fpga chips, be connected by holding wire between fpga chip and the USB interface chip, be responsible for instruction, the voice data of reception server PC, collect each terminal audio frequency data, send voice data to each terminal, each road voice data is switched audio mixing, and can drive a plurality of terminating machines; Terminating machine uses fpga chip as main devices, and external microphone, earphone, and the input of circuit audio frequency, the audio signal output of being responsible for receiving are sent to main control computer to earphone with microphone audio and the input of circuit audio frequency.
The power supply of whole device is electrically connected with the city by the power connecting plug of main control computer, and in main control computer, after converting safe low-voltage to, Switching Power Supply supplies with main control computer, and distribute to each terminating machine, server PC is connected by USB interface with main control computer, realize two-way communication, server PC is as the USB main equipment, main control computer is as the USB slave unit, server PC goes up operation human interface software, realization is to the control of system, can set up differential signal by the RS485 chip between main control computer and the terminating machine is connected, also can use optical fiber to set up photosignal connects, for more short-range transmission, to set up differential signal by RS485 chip cheaply and connect, the required power supply of terminating machine all is connected by the Category-5 twisted pair with 4 pairs of lines with data-signal; For long Distance Transmission, be equipped with optical-electrical converter between main control computer and the terminating machine, use optical fiber to connect, the required power supply of terminating machine is supplied with voluntarily at far-end.
The core methed that the present invention is achieved is to use field programmable gate array (FPGA) to realize special-purpose Digital Logic, finishes the Core Features such as transmitting-receiving, audio exchange audio mixing of control, audio frequency and the control signal of audio chip.FPGA had obtained fast-developing user customizable digital device in the last few years, and the user uses hardware description language (HDL) to programme to it, made it finish certain specific digital logic functions.
Adopt such scheme to equal to design the special-purpose digit chip that is used for audio exchange and audio mixing,, can use hdl file to come flow to produce application-specific integrated circuit (ASIC) (ASIC) fully as the FPGA design if needs are arranged.Switching and audio mixing effect between such 64 audio frequency are no longer dependent on processor performance and software algorithm, particularly, in 64 road voice frequency terminals that this device drives any one tunnel, can be at synchronization, with the audio signal of this optional multichannel in 64 tunnel of the stereophony tonequality uppick of 44.1KHz sample rate.In addition owing to use pure hardware to finish the work, the propagation delay of audio signal is less than 1 millisecond, and this is based on, and the method for software is difficult to realize that this high-quality complete arbitrarily exchange sound mixing function also is a novelty.Owing to used USB interface, use a notebook computer can realize control to system, the audio file of storing in the computer terminal can be sent to, of the broadcasting of single first song can be realized, perhaps the different songs in each road terminal program request computer 64 tunnel terminals.If, can also realize audio exchange greater than 64 the tunnel with a plurality of main control computer cascades.
Description of drawings:
Fig. 1 is the system architecture diagram of this device
Fig. 2 is the main control computer structured flowchart
Fig. 3 is an audio mixing fpga chip logic diagram in the main control computer
Fig. 4 is a final drive fpga chip logic diagram in the main control computer
Fig. 5 is the terminating machine structured flowchart
Fig. 6 is a fpga chip logic diagram in the terminating machine
Fig. 7 is an exchange sound mixing function schematic diagram
Fpga chip circuit theory diagrams in Fig. 8-the 1st, main control computer
RS485 drive circuit schematic diagram in Fig. 8-the 2nd, main control computer
USB interface chip circuit schematic diagram in Fig. 8-the 3rd, main control computer
Fig. 8-the 4th, main control computer is interior to outer cable RJ45 connector circuit schematic diagram
Fpga chip circuit theory diagrams in Fig. 9-the 1st, terminating machine
Fig. 9-the 2nd, audio coding decoding circuit theory diagrams in the terminal
Fig. 9-the 3rd, liquid crystal display drive circuit schematic diagram in the terminal
Embodiment:
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing:
As shown in Figure 1, the whole system of this device mainly is made up of three kinds of parts.First kind of parts is server PC 101.It is a computer that has USB interface, and function is to be responsible for being provided with system parameters, and for example exchange, audio mixing pattern are provided with, playback, recording and the button of resolving terminal, the liquid crystal display screen displaying contents of control terminal etc.; Second kind of parts is main control computers 102, main control computer 102 is the electronic equipments of design voluntarily, and it finishes instruction, the voice data of reception server PC101, collects each terminal audio frequency data, send voice data to each terminal, each road voice data is switched Core Features such as audio mixing; The third parts are terminating machines 103, and each terminating machine can external microphone, earphone 105, and the input of circuit audio frequency, and for example CD-audio player 106, electronic organ 107, electric guitar 108 etc.The audio signal output that terminating machine 103 is responsible for receiving is sent to main control computer to earphone with microphone audio and the input of circuit audio frequency.The power supply of whole device is electrically connected with the city by the power connecting plug 104 of main control computer 102, and supplies with main control computer 102 in 102 after Switching Power Supply converts safe low-voltage to, and distributes to each terminating machine 103.A main control computer can drive a plurality of terminating machines.Use one to support the connecting line of USB2.0 agreement to be connected by USB interface between server PC101 and the main control computer 102, server PC101 is as the USB main equipment, and main control computer 102 is as the USB slave unit.Server PC101 goes up the operation human interface software, and the user can control this software by simple keyboard, mouse action, realizes the control to system.Use digital electric signal or photoelectric conversion signal to communicate between main control computer 102 and the terminating machine 103.For more short-range transmission, for example 15 meters with interior situation, and preferably using cheaply, the RS485 differential lines connects; For long Distance Transmission, can be equipped with optical-electrical converter between main control computer 102 and the terminating machine 103, use optical fiber to connect.Use under the situation of RS485, terminating machine 103 required power supplies all are connected by the Category-5 twisted pair with 4 pairs of lines with data-signal; When using the long-distance optical fiber transmission, data-signal uses optical fiber to connect, and the required power supply of terminal can be supplied with voluntarily at far-end.
The structured flowchart of main control computer 102 inside because its number of pin of fpga chip is limited cheaply at present, so uses three FPGA cascades to finish the work in the designed main control computer 102 of native system as shown in Figure 2, connects 64 tunnel terminals so that enough pins to be provided.Audio mixing fpga chip 202 is connected with USB interface chip 201 by holding wire, and USB interface chip 201 is connected with server PC101 by the USB2.0 connecting line again.Audio mixing fpga chip 202 is by interconnect signal line and two final drive fpga chip 203,204 cascades between FPGA.The audio exchange audio mixing logic of core need be finished in audio mixing fpga chip 202 inside.Final drive fpga chip 203,204 is mainly finished the various data transmit-receives to terminal.Each final drive fpga chip can drive 32 terminating machines.Terminating machine 103 is set up signal with main control computer 102 by full duplex 485 drivers 205 or optical-electrical converter 206 and is connected, and uses Category-5 twisted pair or optical fiber to connect respectively under two kinds of situations.485 drivers 205 or optical-electrical converter 206 with final drive fpga chip 203,204 all by the signal of telecommunication at main control computer 102 intraconnections.
As shown in Figure 3, audio mixing fpga chip 202 is connected to form by USB chip interface module 301, exchange audio mixing Instructions Cache 302, audio exchange, audio mixing logic module 303, voice data transmission buffering area 304, voice data collection buffering area 305, voice data transmission logic 306, voice data collection logic 307, instruction sending module 308, button collection module 309, and inner USB chip interface module 301 is to set up the FPGA internal logic module that logic is connected with the USB interface chip.USB chip interface module 301 will be provided with instruction from the exchange audio mixing pattern that server PC101 receives and store exchange audio mixing Instructions Cache 302 into.Collect logic 307 by voice data, each the road voice data that sends from final drive fpga chip 203 is received, and sends to voice data and collects buffering area 305.Voice data is collected buffering area 305 and is adopted the dual port RAM structure, and each road voice data is stored wherein with certain address regulation, and brings in constant renewal in.Audio exchange, audio mixing logic module 303 read each the road voice data in the voice data collection buffering area 305, and read the instruction of exchange audio mixing Instructions Cache 302 storage inside, how to generate new voice data according to the instruction decision.Audio exchange, audio mixing logic module 303 write voice data with newly-generated data and send buffering area 304, and bring in constant renewal in its inner data.Voice data sends logic 306 and reads the data that voice data sends buffering area 304 inside, and data distributing is arrived final drive fpga chip 203, and by the cascade of final drive fpga chip 203, data also can be transferred to final drive fpga chip 204.In addition, the instruction that the need that USB chip interface module 301 sends server PC101 are distributed to terminal sends to instruction sending module 308, and instruction sending module 308 arrives terminal driver fpga chip 203 or terminal driver fpga chip 204 with data distributing again.The button that comes self terminal is written into button collection module 309 after collecting through the final drive fpga chip, and button collection module 309 writes data USB chip interface module 301 again, and the last serviced device PC101 of button data reads by USB interface.
As shown in Figure 4, the final drive fpga chip is connected to form by upstream data transmission interface 401, local data sending module 402, downstream data transmission interface 403, upstream data receiving interface 404, local data receiver module 405, downstream data receiving interface 406, data distribution driver module 407, data collection driver module 408, upstream data transmission interface 401 (for example is connected with the upstream fpga chip, for final drive fpga chip 203, be connected to audio mixing fpga chip 202; For final drive fpga chip 204, be connected to final drive fpga chip 203).After upstream data transmission interface 401 receives data, data are sent to downstream data transmission interface 403 through the fpga chip internal data link.Local data sending module 402 interception data links, if the data that issue are to send to local (being 32 tunnel terminals that this FPGA drives), local data sending module 402 will be accepted data so, by data distribution driver module 407 data will be distributed to each terminal then.Downstream data receiving interface 406 connects the data-interface of uploading of downstream FPGA, and sends to upstream data receiving interface 404 through data link after receiving data, and upstream FPGA passes data again.Local data is collected and after driver module 408 receives the data of self terminal data to be sent to local data receiver module 405, and local data receiver module 405 is pooled to upstream data receiving interface 404 by data link with data again.
As shown in Figure 5, terminating machine is mainly connected to form by signal converter 501, terminal fpga chip 502, audio socket 504, display buffer 505, liquid crystal display screen 506, button 507, stereo audio coding decoding chip 503.Signal converter 501 is 485 transceivers or optical-electrical converter among the figure, and it is connected by the signal of telecommunication with terminal fpga chip 502.Terminal fpga chip 502 is core devices of terminal.It uses asynchronous serial agreement and main control computer 102 to connect.Terminal is equipped with liquid crystal display screen 506, liquid crystal display data is stored in the display buffer 505, terminal fpga chip 502 is driven into liquid crystal display screen 506 by read-write display buffer 505 with video data, realize user's visual interface, terminal fpga chip 502 is the scan logic button 507 by designing voluntarily also, receives press key message sent by user, connects stereo audio coding decoding chip 503, audio socket 504 can supply microphone, earphone and circuit input.
As shown in Figure 6, terminal fpga chip 502 is connected to form by data transmit-receive module 601, display buffer controller 602, liquid crystal driver module 603, key scan module 604, CODEC driver module 605.Data transmit-receive module 601 is responsible for setting up getting in touch of link layer with mainframe box, promptly resolves or coding UART data format.Liquid crystal display data writes display buffer by display buffer controller 602 after data transmit-receive module 601 is resolved.Voice data writes CODEC driver module 605 after data transmit-receive module 601 is resolved.Key scan module 604 external point contact type keyboards, and keyboard scanned send to keyboard-coding data transmit-receive module 601 after scanning button.CODEC driver module 605 external audio frequency CODEC chips, and the audio sampling data of CODEC chip is sent to data transmit-receive module 601.Display buffer controller 602 externally drives memory, and with the data cached liquid crystal driver module 603 of delivering to.Liquid crystal driver module 603 is responsible for driving outside liquid crystal display screen.
As shown in Figure 7, the Core Feature of this device is that any one voice frequency terminal can be heard any multi-path audio-frequency data audio mixing stack that comprises PC playback data in the system.
Claims (6)
1, a kind of multichannel voice frequency exchange arbitrarily, the device of audio mixing, it is characterized in that mainly forming by server PC (101), main control computer (102) and terminating machine (103), server PC (101) is a computer that has USB interface, be responsible for being provided with system parameters, exchange audio mixing pattern is set, playback, recording and the button of resolving terminal, the liquid crystal display screen displaying contents of control terminal;
Main control computer (102) is integrated with the USB interface chip, also be integrated with one or more pieces fpga chips, be connected by holding wire between fpga chip and the USB interface chip, be responsible for instruction, the voice data of reception server PC (101), collect each terminal audio frequency data, send voice data to each terminal, each road voice data is switched audio mixing, and can drive a plurality of terminating machines;
Terminating machine (103) uses fpga chip as main devices, and external microphone, earphone (105), and the input of circuit audio frequency, the audio signal output of being responsible for receiving are sent to main control computer to earphone with microphone audio and the input of circuit audio frequency;
The power supply of whole device is electrically connected with the city by the power connecting plug (104) of main control computer (102), and in main control computer (102), after converting safe low-voltage to, Switching Power Supply supplies with main control computer (102), and distribute to each terminating machine (103), server PC (101) is connected by USB interface with main control computer (102), realize two-way communication, server PC (101) is as the USB main equipment, main control computer (102) is as the USB slave unit, server PC (101) goes up operation human interface software, realization is to the control of system, can set up differential signal by the RS485 chip between main control computer (102) and the terminating machine (103) and be connected, also can use optical fiber to set up photosignal and connect; For more short-range transmission, to set up differential signal by RS485 chip cheaply and connect, the required power supply of terminating machine (103) all is connected by the Category-5 twisted pair with 4 pairs of lines with data-signal; For long Distance Transmission, be equipped with optical-electrical converter between main control computer (102) and the terminating machine (103), use optical fiber to connect, the required power supply of terminating machine is supplied with voluntarily at far-end.
2, a kind of multichannel voice frequency according to claim 1 exchanges arbitrarily, the device of audio mixing, it is characterized in that main control computer (102) is mainly connected to form successively by three fpga chips and a USB interface chip (201), audio mixing fpga chip (202) is connected with USB interface chip (201) by holding wire, USB interface chip (201) is connected with server PC (101) by the USB connecting line again, audio mixing fpga chip (202) is by interconnect signal line and two final drive fpga chips (203) between the fpga chip, (204) cascade, audio mixing fpga chip (202) is mainly finished audio exchange audio mixing logic, final drive fpga chip (203), (204) mainly finish various data transmit-receives to terminal, each final drive fpga chip can drive 32 terminating machines, terminating machine (103) is set up signal with main control computer (102) by full duplex 485 drivers (205) or optical-electrical converter (206) and is connected, 485 drivers (205) or optical-electrical converter (206) and final drive fpga chip all by the signal of telecommunication at main control computer (102) intraconnection.
3, a kind of multichannel voice frequency according to claim 2 exchanges arbitrarily, the device of audio mixing, it is characterized in that audio mixing fpga chip (202) is by USB chip interface module (301), exchange audio mixing Instructions Cache (302), audio exchange, audio mixing logic module (303), voice data sends buffering area (304), voice data is collected buffering area (305), voice data sends logic (306), voice data is collected logic (307), instruction sending module (308), button collection module (309) connects to form, USB chip interface module (301) is to set up the fpga chip internal logic module that logic is connected with the USB interface chip, instruction will be set from the exchange audio mixing pattern that server PC (101) receive store exchange audio mixing Instructions Cache (302) into, collect logic (307) by voice data, each the road voice data that sends from final drive fpga chip (203) is received, send to voice data and collect buffering area (305), voice data is collected buffering area (305) and is adopted the dual port RAM structure, each road voice data with certain address regulation storage wherein, and bring in constant renewal in, audio exchange, audio mixing logic module (303), read voice data and collect each interior road voice data of buffering area (305), and read the instruction of exchange audio mixing Instructions Cache (302) storage inside, how to generate new voice data according to the instruction decision, audio exchange, audio mixing logic module (303) writes voice data with newly-generated data and sends buffering area (304), and bring in constant renewal in its inner data, the logic (306) that sends voice data reads voice data and sends the inner data of buffering area (304), and with data distributing to final drive fpga chip (203), cascade by final drive fpga chip (203), data also can be transferred to final drive fpga chip (204), in addition, the instruction that the need that USB chip interface module (301) sends server PC (101) are distributed to terminal sends to instruction sending module (308), instruction sending module (308) arrives final drive fpga chip (203) with data distributing again, (204), the button that comes self terminal is written into button collection module (309) after collecting through the final drive fpga chip, button collection module (309) is write data USB chip interface module (301) again, and the last serviced device PC of button data (101) reads by USB interface.
4, a kind of multichannel voice frequency according to claim 2 exchanges arbitrarily, the device of audio mixing, it is characterized in that final drive FPGA (203), (204) by upstream data transmission interface (401), local data sending module (402), downstream data transmission interface (403), upstream data receiving interface (404), local data receiver module (405), downstream data receiving interface (406), data distribution driver module (407), data collection driver module (408) connects to form, upstream data transmission interface (401) is connected with the upstream fpga chip, after upstream data transmission interface (401) receives data, data are sent to downstream data transmission interface (403) through the FPGA internal data link, local data sending module (402) interception data link, if the data that issue are to send to local will accept data, by data distribution driver modules (407) data are distributed to each terminal again, downstream data receiving interface (406) connects the data-interface of uploading of downstream FPGA, send to upstream data receiving interface (404) through data link after receiving data, upstream fpga chip passes data again, local data is collected and after driver module (408) receives the data of self terminal data to be sent to local data receiver module (405), and local data receiver module (405) is pooled to upstream data receiving interface (404) by data link with data again.
5, a kind of multichannel voice frequency according to claim 1 exchanges arbitrarily, the device of audio mixing, it is characterized in that terminating machine (103) is mainly by signal converter (501), terminal fpga chip (502), audio socket (504), display buffer (505), liquid crystal display screen (506), button (507), stereo audio coding decoding chip (503) connects to form, signal converter (501) is 485 transceivers or optical-electrical converter, it is connected by the signal of telecommunication with terminal fpga chip (502), terminal fpga chip (502) is the core devices of terminating machine, it uses asynchronous serial agreement and main control computer (102) to connect, terminating machine is equipped with liquid crystal display screen (506), liquid crystal display data is stored in the display buffer (505), terminal fpga chip (502) is driven into liquid crystal display screen (506) by read-write display buffer (505) with video data, realize user's visual interface, terminal fpga chip (502) is the scan logic button (507) by designing voluntarily also, receive press key message sent by user, connect stereo audio coding decoding chip (503), audio socket (504) can supply microphone, earphone and circuit input.
6, a kind of multichannel voice frequency according to claim 5 exchanges arbitrarily, the device of audio mixing, it is characterized in that terminal fpga chip (502) is by data transmit-receive module (601), display buffer controller (602), liquid crystal driver module (603), key scan module (604), CODEC driver module (605) connects to form, data transmit-receive module (601) is responsible for setting up getting in touch of link layer with main control computer, promptly resolve or coding UART data format, liquid crystal display data writes display buffer by display buffer controller (602) after data transmit-receive module (601) is resolved, voice data writes CODEC driver module (605) after data transmit-receive module (601) is resolved, the external point contact type keyboard of key scan module (604), and keyboard scanned, after scanning button, keyboard-coding sent to data transmit-receive module (601), CODEC driver module (605) external audio frequency CODEC chip, and the audio sampling data of CODEC chip is sent to data transmit-receive module (601), display buffer controller (602) externally drives memory, and with the data cached liquid crystal driver module (603) of delivering to, liquid crystal driver module (603) is responsible for driving outside liquid crystal display screen.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102354498A (en) * | 2011-08-17 | 2012-02-15 | 深圳市茁壮网络股份有限公司 | Method, device and system for processing mixed sound |
| CN102523001A (en) * | 2011-12-19 | 2012-06-27 | 上海自动化仪表股份有限公司 | Current voltage analogue signal conditioning module for dispersive actuation system (DAS) |
| CN102523000A (en) * | 2011-12-19 | 2012-06-27 | 上海自动化仪表股份有限公司 | Thermocouple thermal resistance analogue signal conditioning module for dispersive actuation system (DAS) |
| CN102867514A (en) * | 2011-07-07 | 2013-01-09 | 腾讯科技（北京）有限公司 | Sound mixing method and sound mixing apparatus |
| CN102866732A (en) * | 2012-08-22 | 2013-01-09 | 上海金图信息科技有限公司 | Zero terminal |
| CN107451941A (en) * | 2017-06-05 | 2017-12-08 | 安徽福讯信息技术有限公司 | A kind of network-type multichannel hearing detection evaluation system |
| CN108076416A (en) * | 2016-11-18 | 2018-05-25 | 中兴通讯股份有限公司 | A kind of control method, device and the terminal of USBTypeC earphones |
| CN108206035A (en) * | 2016-12-20 | 2018-06-26 | 通号通信信息集团上海有限公司 | A kind of embedded recording and playing device and method for carrying out channel selecting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102867514A (en) * | 2011-07-07 | 2013-01-09 | 腾讯科技（北京）有限公司 | Sound mixing method and sound mixing apparatus |
| CN102867514B (en) * | 2011-07-07 | 2016-04-13 | 腾讯科技（北京）有限公司 | A kind of sound mixing method and device sound mixing |
| CN102354498A (en) * | 2011-08-17 | 2012-02-15 | 深圳市茁壮网络股份有限公司 | Method, device and system for processing mixed sound |
| CN102523001A (en) * | 2011-12-19 | 2012-06-27 | 上海自动化仪表股份有限公司 | Current voltage analogue signal conditioning module for dispersive actuation system (DAS) |
| CN102523000A (en) * | 2011-12-19 | 2012-06-27 | 上海自动化仪表股份有限公司 | Thermocouple thermal resistance analogue signal conditioning module for dispersive actuation system (DAS) |
| CN102866732A (en) * | 2012-08-22 | 2013-01-09 | 上海金图信息科技有限公司 | Zero terminal |
| CN108076416A (en) * | 2016-11-18 | 2018-05-25 | 中兴通讯股份有限公司 | A kind of control method, device and the terminal of USBTypeC earphones |
| CN108076416B (en) * | 2016-11-18 | 2021-11-12 | 中兴通讯股份有限公司 | Control method and device of USBTypeC earphone and terminal |
| CN108206035A (en) * | 2016-12-20 | 2018-06-26 | 通号通信信息集团上海有限公司 | A kind of embedded recording and playing device and method for carrying out channel selecting |
| CN107451941A (en) * | 2017-06-05 | 2017-12-08 | 安徽福讯信息技术有限公司 | A kind of network-type multichannel hearing detection evaluation system |
| CN112306388A (en) * | 2019-08-02 | 2021-02-02 | 株式会社日立制作所 | Storage device |
| CN112306388B (en) * | 2019-08-02 | 2024-03-22 | 株式会社日立制作所 | Storage device |
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