WO2005050944A1 - ネットワーク回線を用いたアナログ信号入出力システム - Google Patents
ネットワーク回線を用いたアナログ信号入出力システム Download PDFInfo
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- WO2005050944A1 WO2005050944A1 PCT/JP2004/017292 JP2004017292W WO2005050944A1 WO 2005050944 A1 WO2005050944 A1 WO 2005050944A1 JP 2004017292 W JP2004017292 W JP 2004017292W WO 2005050944 A1 WO2005050944 A1 WO 2005050944A1
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- analog signal
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- host computer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Definitions
- the present invention relates to a system for inputting / outputting an analog electric signal via a computer network line, and more particularly to a configuration for performing analog / digital conversion in an analog signal input / output terminal device.
- a sound card is provided with a speaker terminal and a microphone terminal, and a configuration is known in which a sound output from a computer is output to a speaker by using the speaker terminal, and a sound is input by a microphone connected to the microphone terminal.
- printers and scanners already have a wireless LAN
- the power that is widely shared from computers connected to computers is high in their affinity with the network, and they are devices that handle digital signals, not devices that input and output analog signals.
- a general-purpose device for freely inputting an analog signal and processing it by a computer has not been provided. Not only audio but also an analog signal obtained by a measuring device or the like can be freely input to a computer. There is a need for a device that can.
- a terminal encodes audio and transmits it to a host computer, which decodes the audio and decodes the audio.
- a configuration for recognizing and returning the result to a terminal is disclosed.
- a method of using a general personal computer or the like for a terminal and causing the host to perform high-load data processing is well known.
- Patent Document 1 Japanese Patent Publication 2003-316375
- this method does not need to transmit acquired audio data strictly without delay in the first place, and does not disclose any special technology for transmitting actual measurement data and audio data in real time.
- Japanese Patent Publication No. 2003-163703 discloses a network address translator capable of simultaneously connecting a large amount of voice communications between different networks. According to the disclosure, when a call setting request is received, the NAT control unit that performs address conversion newly generates a voice transmission port. In this configuration, in order to carry out voice communication between different networks in the first place, a port for voice transmission is generated in both networks, and one control socket and a large number of voice communication sockets are assumed. For this purpose, two sockets are used V, which is only separate, and various control information cannot be transmitted on the control socket even during voice communication. Therefore, the signal for changing the encoding method of the analog signal or controlling the reproduction method of the signal must use the socket for analog signal communication. Patent Document 2: Japanese Patent Publication 2003-163703
- An analog signal input terminal that converts an input analog signal into a digital signal and transmits the digital signal to a host computer via a network, and a digital signal generated by the host computer It is an object to provide a configuration for transmitting to an analog signal output terminal via a network, converting the signal to an analog signal in the terminal, and outputting the analog signal.
- the present invention has been created with such a conventional background, and provides the following means.
- the invention according to claim 1 is an analog signal input system that uses an analog signal input terminal that converts an analog signal into a digital signal and transmits the digital signal to a host computer via a network.
- the terminal has at least an analog signal input unit, an AD converter that converts the analog signal into a digital signal, a network controller that can be connected to IP and manages data transmission and reception, and an uplink between the host computer.
- a terminal-side IP connection establishment processing unit that establishes two connections of a socket and a downlink socket, a control signal processing unit that receives a control signal related to at least a start request and a stop request of the host computer, and a control signal processing unit based on the control signal.
- a signal transmitting unit for transmitting a digital signal.
- At least a host-side IP that can be connected to the host computer and that establishes two connections, an upstream socket and a downstream socket, between a network adapter unit that is capable of IP connection and controls data transmission and reception and an analog signal input terminal.
- a connection establishment processing unit a control signal processing unit that transmits at least a control signal related to a start request and a stop request to an analog signal input terminal, an application processing unit that executes an application and uses the digital signal in the application
- an IP connection disconnection processing unit that disconnects the upstream socket connection and the downstream socket connection.
- the invention according to claim 2 is characterized in that, when the terminal-side IP connection establishment processing unit of the analog signal input terminal detects a downlink socket connection of a host computer, the terminal-side IP connection establishment processing unit performs an uplink socket connection toward the computer.
- the host-side IP connection establishment processing unit of the host computer is an analog signal input system that operates to make a downlink socket connection to an analog signal input terminal.
- the invention according to claim 3 is that an analog signal input terminal is provided with a microphone, and an output signal from the microphone is input at an analog signal input unit, and audio is captured via a network. Is a system that allows
- the invention according to claim 4 is the analog signal input system, wherein the network is a wireless communication network, and the network controller unit and the network adapter unit are compatible with a wireless communication network.
- the invention according to claim 5 is a communication system, wherein the network comprises a UDP (User Datagram).
- UDP User Datagram
- the IP packet at the time of the IP connection is included in the UDP packet, and the header part of the UDP protocol is transmitted including the characteristic information data relating to the signal content of the captured digital signal.
- the analog signal is an audio signal
- the characteristic information data is at least one of an audio level, a sampling rate, and the number of bits per sample. It is.
- the present invention can also provide the following analog signal output system.
- the invention according to claim 7 transmits a digital signal from a host computer to an analog signal output terminal via a network and sends the digital signal to the analog signal output terminal.
- An analog signal output system that converts the digital signal into an analog signal and outputs the analog signal.
- the analog signal output terminal includes at least an IP connectionable network controller for transmitting and receiving data, and an upstream socket between a host computer and the host controller. And a terminal side IP connection establishment processing section for establishing two connections of a downlink socket, a control signal processing section for receiving at least a start signal and a stop request control signal from the host computer, and a control signal processing section based on the control signal. ! /,
- a signal receiving unit for receiving a digital signal, a DA converting unit for converting the digital signal into an analog signal, and an output unit for outputting the analog signal.
- the host computer has at least a network adapter unit capable of IP connection and controlling data transmission and reception, and a host-side IP connection for establishing two connections of an upstream socket and a downstream socket between the analog signal input terminal.
- An establishment processing unit a control signal processing unit that transmits control signals related to at least a start request and a stop request to the analog signal output terminal, an application processing unit that executes an application and generates the application power digital signal, It has a signal transmission unit for transmitting the generated digital signal, and an IP connection disconnection processing unit for disconnecting the upstream socket connection and the downstream socket connection.
- the invention according to claim 8 is characterized in that the terminal-side IP connection establishment processing unit of the analog signal output terminal, when detecting a downstream socket connection of the host computer power, performs an upstream socket connection toward the computer.
- the host-side IP connection establishment processing unit of the host computer is an analog signal output system that operates to make a downlink socket connection to an analog signal input terminal.
- the analog signal output terminal includes a buffer area unit and a data request unit, and the data request unit transmits the data according to the storage capacity in the buffer area unit.
- a transmission request signal is transmitted, and the signal transmission section of the host computer transmits a digital signal in accordance with the transmission request signal.
- the analog signal output terminal is provided with a speaker and the output signal from the output unit is generated as a sound from the speaker, the sound is output via a network. Becomes possible.
- the network is a wireless communication network
- the network controller unit and the network adapter unit wireless communication network It is characterized in that
- UDP User Datagram
- the IP packet at the time of the IP connection is included in the UDP packet, and the header part of the UDP protocol is transmitted including the characteristic information data on the signal content of the captured digital signal.
- the analog signal is an audio signal
- the characteristic information data is an audio level, a sampling rate, at least V of a bit number per sample, or a deviation. Output system.
- the analog signal output terminal includes a buffer unit having a predetermined capacity for storing the digital signal received by the signal receiving unit, and the storage capacity or the remaining capacity in the buffer unit. And a synchronization control unit that changes a sampling clock in the DA converter in accordance with any of the capacities, and provides a system that synchronizes an analog signal output from an output unit.
- the analog signal output system is configured to include two or more analog signal output terminals for one host computer, and each analog signal output terminal includes: A technique is provided for transmitting two or more different types of audio data including stereo left and right channel audio data, respectively, and synchronizing two or more analog signal output terminals with the operation of the synchronization control unit.
- the invention according to claim 16 is the analog signal output system, wherein a remote control terminal for remotely controlling an output mode of the analog signal output terminal is provided on a network, wherein the host computer and the host computer are connected to each other.
- the network adapter unit of the host computer Is an analog signal output system that receives the signal and, based on the signal, transmits the control signal by the control signal processing unit.
- an analog signal input terminal for converting an input analog signal into a digital signal and transmitting the digital signal to a host computer via a network, and a host computer
- the digital signal generated by the data is transmitted to an analog signal output terminal via a network, converted into an analog signal within the terminal, and output, so that voice and measurement data can be transmitted between remote locations in real time. be able to. Further, by providing the synchronization control mechanism, no phase shift occurs even for stereo sound or the like.
- FIG. 1 is an overall configuration diagram of an analog signal input / output system according to the present invention.
- FIG. 2 is an explanatory diagram illustrating an operation between each module of the system according to the present invention.
- FIG. 3 is a configuration diagram of an analog signal input system according to the present invention.
- FIG. 4 is a configuration diagram of an analog signal output system according to the present invention.
- FIG. 5 is an operation sequence showing a data flow during recording.
- FIG. 6 is an operation sequence showing a data flow during reproduction.
- FIG. 7 is an explanatory diagram relating to a buffer management in the analog signal input / output system according to the present invention.
- FIG. 8 is an explanatory diagram showing a data transmission procedure during recording.
- FIG. 9 is an explanatory diagram showing a data transmission procedure during reproduction.
- FIG. 10 is an overall configuration diagram of an analog signal input / output system according to a second embodiment of the present invention.
- FIG. 11 is an explanatory diagram of a socket of an analog signal input / output system according to a second embodiment of the present invention.
- FIG. 12 is an explanatory diagram showing the structure of audio data.
- FIG. 13 is a block diagram of an analog signal input / output system according to Embodiment 2 of the present invention.
- FIG. 14 is a block diagram of an audio processing circuit according to a second embodiment of the present invention.
- FIG. 15 is an overall configuration diagram of an analog signal input / output system according to a third embodiment of the present invention.
- FIG. 1 shows an analog signal input / output system according to the present invention (hereinafter referred to as the present system).
- the present system also includes an analog signal input / output device (30), which is a terminal capable of communicating with the host computer (10) via a network (20), and the host computer uses analog signals input and output. To execute an application (11) for performing a desired process.
- the network interface adopts the TCP / IP socket method, and has two sockets, a dedicated socket for downlink information (downlink socket) (21) and a dedicated socket for uplink information (uplink socket) (22). Is provided. Note that the host computer power is also referred to as going down to the analog input / output device, and the opposite direction is called up.
- the analog signal input / output device (30) is provided with a terminal (31) for inputting an analog signal and a terminal (32) for outputting an analog signal, and these terminals are used for AZD conversion (33) in the device (30). And connected to each processing unit of DZA conversion (34)!
- the host computer (10) is preferably a personal computer (A), and one analog signal input / output device (30) is configured as a dedicated unit (B). It may be implemented in a communication device or a device that inputs and outputs analog signals such as a measuring device, a speaker, and a microphone.
- the network (20) may take any form as long as the TCP / IP socket method can be used, but the Internet or a wired or wireless LAN is suitable.
- analog signal input system and the output system can be configured separately according to the application.
- the analog signal input / output device (30) is provided with a speaker and a microphone, and audio reproduced by a personal computer is output from the speaker, or audio is input by a microphone and used on a personal computer.
- FIG. 2 is a diagram illustrating the operation of each hardware and software module.
- the host application running (40) receives various setting 'command' data sent to the sound driver by the virtual sound driver (41), and temporarily transfers it to the buffer driver (42). It is stored and the setting software (43) accesses the buffer driver (42) and inputs / outputs necessary data to / from the analog signal input / output device.
- the virtual sound driver exchanges data with the buffer driver and the data input / output function in response to commands such as playback / recording / stop and various settings.
- the buffer driver is a simple driver having a WAVE data storage area, a data input / output function (IOCTL), and an event notification function for data transfer because the virtual sound driver and the setting software cannot directly input / output data. .
- the setting software is an application that acquires data necessary for reproduction / recording in accordance with a change in the state and executes communication with the apparatus in response to a notification from the buffer driver.
- FIGS. 3 and 4 show configuration diagrams of an analog signal input system and an analog signal output system according to the present invention. Each configuration of input and output is shown separately so that it can be easily separated! However, in an actual embodiment, they are integrally configured.
- the personal computer (50) mainly includes a network adapter section (51) connected to a network, a host-side IP connection establishment processing section (52), and a control signal processing section. (53), IP connection disconnection processing unit (54), application processing
- the IP connection establishment processing unit (52) is provided with an upstream socket and an analog signal input device (60). Establish two connections on the egress socket. Further, the control signal processing section (53) transmits a control signal to the analog signal input device. This will be described later in detail.
- the IP connection disconnection processing unit (54) performs a process of disconnecting the upstream socket connection and the downstream socket connection after the input is completed.
- the application processing unit (55) is a processing unit that performs software processing of the sound application (40), virtual sound driver (41), buffer driver (42), and setting software (43) shown in FIG. is there.
- the network adapter section (51) is composed of a well-known LAN card and its driver software.
- the other processing sections (52)-(55) are each a CPU mounted on a personal computer and a memory cooperating therewith. Processing is performed using an external storage device.
- the analog signal input device (60) mainly includes a network controller (61) connected to a network, and a terminal-side IP connection establishment processor (62), a control signal processor (63), and a key controller.
- the network controller section (61) is connected to the network adapter section (51) by IP, and is configured by, for example, a known IC circuit together with the IP connection establishment processing section (62).
- the control signal processing section (63) receives the control signal from the host computer and controls the signal transmission in the signal transmission section (66).
- a microphone is connected to the analog signal input section (64), and an analog input signal from the microphone is AD-converted.
- the method of AD conversion is known, and can be easily equipped with a dedicated IC or the like.
- the personal computer (50) has an IP connection establishment processing section (52) on the host side centering on a network adapter section (51) for connecting to a network. It has a control signal processing unit (53), an IP connection disconnection processing unit (54), and an application processing unit (55).
- the same components as those in the input system are denoted by the same reference numerals.
- the IP connection establishment processing unit (52) is connected to the analog signal output device (70) with an upstream socket and Establish two connections on the egress socket. Further, the control signal processing unit (53) transmits a control signal to the analog signal output device. This will be described later in detail.
- the IP connection disconnection processing unit (54) performs a process of disconnecting the upstream socket connection and the downstream socket connection after the input is completed.
- the analog signal output device (70) includes a network controller unit connected to a network.
- a buffer area section (74) and a data request section (75) are provided for buffer control.
- a speaker is connected to the analog signal output unit (73), and the analog signal output unit (73) is connected to a personal computer.
- the playback data generated by the (50) sound application (40) can be output as audio.
- FIG. 5 shows the operation sequence of the application (40), virtual sound driver (41), knocker (42), and setting software (43) when audio is input from the microphone and recorded by the application (40).
- Fig. 6 shows the operation sequence of the application (40), virtual sound driver (41), buffer (42), and setting software (43) when audio data is generated by the application and output from the speaker.
- the data information used on the application side is passed from the virtual driver to the buffer driver, and the format setting and the data transfer setting value setting are performed. Processing (ftnt setting and display) is performed.
- the format setting function each data of the expression format, the channel, the sampling frequency, the data transfer amount, the block size, and the Bit / Sample is transmitted starting from the WAVE format pointer.
- KSPAUSE_STATE KSRUN_STATE ⁇ KSPAUSE_STATE ⁇
- KSSTOP_STATE is a series of flows in the playback / recording process.
- the playback / recording data is transferred at the set time interval / transmission amount using the set data transfer area.
- FIG. 7 is an explanatory diagram showing a configuration of the buffer driver (42).
- the interface function and the state change between the data buffer (80), which is the WAVE data storage area, and the IOCTL (81) A notification function for notifying the event (82) is provided.
- the status change (82) is notified to the setting software by an event notification.
- the write point and the read point on the virtual sound driver side and the setting software side are controlled by flags.
- the setting software (43) is resident in the OS when started, and is an application that performs packet communication with the analog signal input / output device when a setting is changed by the GUI and an event is received from the buffer driver. Has been created as. And GUI screen processing and event reception thread are always running.
- GUI it is possible to set the IP address of the device, set the playback & recording volume setting timeout time, and set the number of retries.
- two sockets are provided between the personal computer (10) and the analog signal input / output device (30), a socket dedicated to uplink information and a socket dedicated to downlink information.
- the downlink information dedicated socket transmits a command or data as a downlink message, and a reception port of, for example, a port number 47474 is provided on the device (30) side.
- the upstream information-only socket sends commands and data as upstream messages and returns status in downstream messages.
- the personal computer (10) is provided with, for example, a reception port having a port number 41414.
- connection sockets are connected to the IP connection establishment processing unit (52) of the personal computer (10) at the time of connection, the connection sockets are connected from the connection establishment processing unit (62) of the device (30). I have to do it.
- the upstream socket and the downstream socket are independently connected as described above, and data transmission and reception are transmitted and received by selectively using data and commands in the upstream socket and the downstream socket, as described later. And realizes stable signal input and output.
- an EXIST command for confirming the presence / absence of the analog signal input / output device (30) and transmitting the initialization is transmitted using the down socket. Return normal status from (30). Similarly, a recording volume setting command and a recording start command are sent, and the device (30) returns a normal status.
- the analog signal to which the microphone is connected (64) is also input to the analog signal, and the analog signal is subjected to analog / digital conversion (65) to become a digital signal.
- the recording data has a data length set based on the data speed in the format setting described above. For example, 8192 bytes when the data is less than 16 KByte / sec, 16384 bytes when the data is less than 32 KByte / sec, and 32768 bytes when the data is 32 KByte / sec or more.
- the data is waveform data that can be processed by the application.
- the application processing unit (55) of the personal computer (10) returns a normal or abnormal status through the up socket each time recording data is received.
- a control signal processing unit (53) force recording volume setting command is transmitted through the down socket.
- the command is processed by the control signal processing unit (63) of the device (30), and returns a response, and is reflected in, for example, signal strength adjustment at the analog signal input unit (64).
- a recording stop command is transmitted through the downstream socket, and AD conversion (65) and signal transmission (66) are stopped based on the received command of the control signal processing unit (63). U.
- the misplaced recording data may be sent to the personal computer (10) and then discarded by the application processing unit (55). Finally, after transmitting the normal status to the device (30) using the upstream socket, the upstream socket and the downstream socket are disconnected.
- the analog signal output device can be provided with the buffer area section (74) and the data request section (75), thereby enabling analog signal output without interruption! /
- the EXIST command for confirming the presence / absence of the analog signal input / output device (30) and transmitting the initialization is transmitted using the downlink socket as described above, and when the reproduction process is normal. Returns the status from the device (30). Similarly, a playback volume setting command and a playback start command are sent, and the device (30) returns a normal status.
- the audio reproduction data is transmitted to the device side using the downstream socket.
- the digital data received by the signal receiving section (71) is accumulated in the buffer area section (74), while the digital / analog converting section (72) converts the digital data into an analog signal, and outputs the analog signal.
- the sound is output from the speaker connected to (73).
- control signal processing unit (63) If there is free space in the buffer area after receiving the reproduced data, the control signal processing unit (63) returns a normal status indicating that there is free buffer space.
- the control signal processing unit (53) of the personal computer (10) receives the status indicating that the buffer is available, the reproduction data from the application processing unit (55) is transmitted by the signal transmission unit (56).
- the transmission from the signal transmission section (56) is interrupted and stored in, for example, a memory of a personal computer or an external storage device.
- the data requesting unit (75) sends the reproduction data request command. Send using socket.
- the control signal processing unit (53) returns a normal status using the up socket, and instructs the signal transmission unit (56) to transmit reproduced data again using the down socket. Thereafter, this is repeated, and audio output is performed while accumulating fixed reproduction data in the buffer area (74).
- control signal processing unit (63) of the device (30) transmits a reproduction data empty command using the upstream socket. This command is to notify that data has been lost, and repeats transmission every 10 seconds in the empty state without receiving the playback stop command.
- the personal computer (10) When stopping playback, the personal computer (10) sends a playback stop command using the socket, and ends the playback process with a normal status response from the device (30).
- each command or data is assigned a serial number so that the order of recording and reproduction and the order of the commands are not mistaken.
- the upstream and downstream messages Each time a message is sent, the sender's power S is incremented by a serial number, and the serial number is used as the response status to inform the sender whether the V and deviation commands have been sent normally. .
- any analog signal can be input / output to / from the host computer using the analog signal input / output device connected to the host computer via the network. Then, each I / O device has its own I
- the host computer can freely switch the input / output devices simply by specifying the IP address.
- microphones and speakers are typical devices that use analog signals. However, by inputting analog signals that are output force, such as various sensors and measuring devices, conventionally, direct connection is required. Device can be used.
- a stand-alone speaker with a short speaker cord can be configured simply by incorporating the present device (especially an output device) into a speaker and attaching a wireless LAN adapter to a network controller. By arranging them in multiple places, such as at home, it is possible to specify a single personal computer output speaker.
- the present invention provides an input / output device that is extremely versatile, and may be provided as a unit having analog input / output terminals, or may be used to output other analog signals. It may be configured integrally with the device that generates and outputs.
- FIG. 10 shows a socket (port number 47474) (103) for audio data between the host computer (100) and the two analog signal input / output devices (101) (102). Further, as shown in FIG. 11, in the present invention, a socket dedicated for control (port number 41414) (104) is provided separately from audio data so that control and response signals can be transmitted and received.
- the control signal includes signals for searching for an analog signal input / output device on a network, starting recording, and stopping recording.
- the response signal includes a response to the search, recording start, and recording stop.
- UDP is used for the transport protocol.
- UDP buckets include the source port number, destination port number, message length, checksum, and data in the header as standard, and are not substantially different from IP packets.
- the header is transmitted including characteristic information necessary for reproduction (or recording) such as volume, audio level, sampling rate, and number of bits per sample.
- characteristic information necessary for reproduction such as volume, audio level, sampling rate, and number of bits per sample.
- FIG. 12 shows the structure of audio data. That is, the first byte is a command indicating audio data, followed by the number of 1-bit channels (monaural and stereo), the number of bits per sample, volume, sampling rate, and data length as shown below. Then, one frame of PCM data is transmitted.
- one frame of PCM data has a data amount of 10 ms, but is not fixed. If the data length exceeds 512 bytes, the maximum packet length is set to 512 bytes and transmitted in multiple packets. For example, if the frame length is 882 bytes, the header is 6 bytes, and the data length is 888 bytes, the first packet is 512 bytes and the second packet is 376 bytes. Then, when transmitting to the left and right audio channels, the first packet and the second packet are sequentially transmitted.
- FIG. 13 shows the overall configuration of the analog signal input / output device (101).
- the device (100) includes a network controller (110), a CPU (111), a voice processing circuit (112), a DZA conversion processing unit (113), and an AZD conversion processing unit (114) via a LAN, the Internet, or the like.
- a speaker (115) and a microphone (116) are additionally provided.
- the speaker (115) and the microphone (116) may be connected via external terminals without being attached.
- the CPU (111) manages data transfer between the LAN and the audio processing circuit and manages the state of the device.
- the audio processing circuit (112) performs audio data buffering and D / AA ZD conversion as described later. Control, synchronization control and volume control.
- the CPU (ll) After writing the audio data to the audio processing circuit (112), the CPU (ll), if the data is valid, determines the state (the distinction between left channel reproduction, right channel reproduction, recording start, recording stop, etc.) The frame length, sampling rate, number of channels, number of bits, and volume are sequentially written. Finally, a data valid flag (predetermined bit string) is written, and the processing ends.
- FIG. 14 is a circuit block diagram showing the configuration of the audio processing circuit (112).
- a decoding unit (122) connected to the CPU (111) by an address bus and a data bus (120) (121), which are physical signal lines, extracts the control signal and audio data, and outputs a volume transfer unit (123) The data is transferred to the primary buffer (124) and the control unit (125), respectively.
- the volume transfer section (123) changes the reproduction volume with an electronic volume (not shown) based on the volume control information.
- the audio data is continuously transferred to the main buffer (127) via the primary buffer (124) power transfer unit (125).
- data stored in the main buffer (127) is output as it is after DZA conversion as it is.
- the present invention has a new synchronization control mechanism.
- Different clock sources are provided for the host computer and each audio input / output device.
- the sampling clock generator (128) oscillates a unique clock.
- the virtual sound driver of the host computer personal computer
- the data rates are slightly different, and if left untouched, the sound may be interrupted or the phase shift between the left and right stereo channels may increase. Therefore, in the present invention, synchronization control is realized by adjusting to the data rate on the transmission side.
- the lower limit threshold and upper limit threshold of the remaining data capacity of the main buffer (127) are set in advance. Then, the control unit (125) monitors and acquires the remaining data capacity for each data valid signal.
- control unit (125) performs control to delay the sampling clock by one step. It is sent to the DZA conversion processing unit (113) via the conversion unit (130).
- control is performed to increase the sampling clock by one step, and the same is sent. If it is within the proper range, the sampling clock Is returned to the original clock.
- the sampling clock power is 4100 °
- the system clock power generated by the sampling clock generator (128) is 45.1584 MHz
- 44100 Hz is obtained by 512 ⁇ 2 frequency division. According to the control to make this one step slower, it becomes 4401413 ⁇ 4 in the 513 2 division, and it becomes 44186 Hz in the 51 I X 2 division according to the ff control.
- variable rate of the sampling clock is only about 0.2%, and there is no significant effect on the sound quality.
- the data valid signal is the power that the CPU (111) power is also issued after writing one frame of audio data. This includes the processing delay of the host computer task switch, LAN card, driver, and collision delay. And the like.
- the "fluctuation" component has a large effect, so that the true remaining data capacity cannot be measured.
- the remaining data capacity is obtained by averaging the measured values of the past 32 measurements as the current data remaining capacity.
- the initial phase difference is determined by a processing time difference by a unicast to a plurality of audio input / output devices, mainly a transmission time difference to Ethernet (registered trademark).
- a processing time difference by a unicast to a plurality of audio input / output devices mainly a transmission time difference to Ethernet (registered trademark).
- the audio outputs of the plurality of audio input / output devices are synchronized with the initial phase difference, and particularly, a stereo audio output and a surround environment are realized.
- Speaker environments such as 5. lch, 6. lch and 7. lch can be configured in exactly the same way.
- the main buffer (127) has the minimum necessary capacity (about 4 frames), which minimizes the delay and enables coordination with real-time applications and other devices. It is possible.
- the audio input / output device (101) of this embodiment uses PoE for power supply to simplify installation. Also, in order to simplify the setting, when the host computer searches for devices on the LAN, each device responds with an address and so on. Group settings on the transfer abbreviation (setting of left and right speakers) A list of speakers is displayed on the GUI, and the output destination, left and right, volume, etc. can be set by simply selecting them.
- the present apparatus can also transmit the voice input by the microphone to the network side.
- the receiving side is a host computer
- the input is through a virtual sound device, as in the case of output, and can be used as audio input for various applications.
- the receiving side can be another audio input / output device (eg, 102) without going through the host computer.
- the receiving terminal receives the audio in the same manner as described above.
- the system can be configured as an interphone.
- a remote control terminal (130) is provided on a network, and a host computer (10
- This configuration uses an operation socket for remote control in addition to the above-described socket for audio data and a socket dedicated to control.
- the socket is a TCP connection, for example, using 43434 as a port number.
- the terminal (130) is provided with a switch for switching a speaker and a switch for changing a volume. It has a function of sending setting information.
- the information is a bit string such as command and data length, voice input / output device name information to be activated, or volume value, and a known network adapter power is also transmitted through the network.
- the network adapter unit receives the signal, and based on this signal, the control signal processing unit transmits a control signal.
- the output destination and the volume can be adjusted at an appropriate place without using the audio input / output device or the host computer, so that it is particularly preferable to combine with the audio input / output device of the present invention. It is.
- the function can be separately provided in a voice input / output device.
- control was originally performed by the host computer, but designation can be made from any audio input / output device.
- the output destination can be changed to the voice input / output device of the destination.
- an infrared light receiving unit may be provided in the audio input / output device, the host computer, or the remote control device so that remote control can be performed with an infrared remote control card.
- the present invention to the wireless LAN standard 802.lie which discloses wired, wireless LAN, and the Internet.
- the standard since QoS is realized, the above-described problem of packet fluctuation is solved. Therefore, averaging processing is not required, and more complete synchronization and phase synchronization can be achieved.
- signal transmission over a short distance may be performed using wireless USB.
- the present invention is not necessarily limited to voice and can be applied to input and output of any analog signal. Therefore, a configuration in which signals such as peripheral devices are transmitted and received by USB may be used.
- Examples of the analog signal include, for example, illuminance adjustment of an electric lamp, temperature adjustment of a heating wire, an analog video signal, or an arbitrary signal activated by a high-frequency time-series signal.
- PoE was used for power supply, but the power supply method is arbitrary. For example, using solar cells and wireless LAN, completely wireless voice input / output The arrangement of the device is possible.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005515671A JP4696269B2 (ja) | 2003-11-19 | 2004-11-19 | ネットワーク回線を用いたアナログ信号入出力システム |
US10/579,880 US8239542B2 (en) | 2003-11-19 | 2004-11-19 | Analog signal input/output system using network links |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2003/014721 WO2005050433A1 (ja) | 2003-11-19 | 2003-11-19 | ネットワーク回線を用いたアナログ信号入出力システム |
JPPCT/JP03/14721 | 2003-11-19 |
Publications (1)
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WO2005050944A1 true WO2005050944A1 (ja) | 2005-06-02 |
Family
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/014721 WO2005050433A1 (ja) | 2003-11-19 | 2003-11-19 | ネットワーク回線を用いたアナログ信号入出力システム |
PCT/JP2004/017292 WO2005050944A1 (ja) | 2003-11-19 | 2004-11-19 | ネットワーク回線を用いたアナログ信号入出力システム |
Family Applications Before (1)
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PCT/JP2003/014721 WO2005050433A1 (ja) | 2003-11-19 | 2003-11-19 | ネットワーク回線を用いたアナログ信号入出力システム |
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US (1) | US8239542B2 (ja) |
AU (1) | AU2003284412A1 (ja) |
WO (2) | WO2005050433A1 (ja) |
Cited By (1)
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---|---|---|---|---|
JP2008257668A (ja) * | 2007-03-31 | 2008-10-23 | Yasushi Nakamoto | 音声入力式各国語パーソナルコンピューター、ワードプロセッサ、文書作成ソフトウェア |
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US8073995B2 (en) * | 2009-10-19 | 2011-12-06 | Research In Motion Limited | Efficient low-latency buffer |
US10432412B2 (en) | 2016-11-17 | 2019-10-01 | General Electric Company | Process control device using power over ethernet with configurable analog and digital interface |
CN115623092B (zh) * | 2022-12-19 | 2023-02-28 | 北京安帝科技有限公司 | 基于电信号的系统监测方法、装置、设备与介质 |
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- 2003-11-19 AU AU2003284412A patent/AU2003284412A1/en not_active Abandoned
- 2003-11-19 WO PCT/JP2003/014721 patent/WO2005050433A1/ja active Application Filing
-
2004
- 2004-11-19 WO PCT/JP2004/017292 patent/WO2005050944A1/ja active Application Filing
- 2004-11-19 US US10/579,880 patent/US8239542B2/en not_active Expired - Fee Related
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Also Published As
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US20080016223A1 (en) | 2008-01-17 |
AU2003284412A1 (en) | 2005-06-08 |
US8239542B2 (en) | 2012-08-07 |
WO2005050433A1 (ja) | 2005-06-02 |
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