JP2006238009A - Sound source control method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound source control method having a versing-up function with less processing burden on a high-order processor, and to provide its device. <P>SOLUTION: By the sound source control method, sound data with a start identifier arranged at the top is repetitively generated so as to be copied for the portion of necessity after adding a different delay amount to the sound data and making them into a packet or a cell. When the transmission of a sound source is required, transmission is performed to a target user only concerning the packet or cell of a copy route which is the same as that of the packet or cell from which the start identifier is detected at first among the copied packets or cells. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sound source control method and apparatus having a cueing function.

In the third generation mobile communication, an asynchronous mode ATM (Asynchronous Transfer Mode) technique is applied to realize not only voice communication but also high-speed digital data communication and packet communication. Also, voice communication (VoIP: Voice) using IP packets using an IP (Internet Protocol) network.
over Internet Protocol) is also expanding. Asynchronous mode communication using these ATM cells and IP packets is expected to become the mainstream of future voice communication.

  When performing voice communication using ATM cells or IP packets, the ringing tone (RBT: Ring Back Tone), dial tone (DT: Dial Tone), busy tone (BT: Busy Tone), which are realized by existing telephone services For example, it is necessary to provide a function for simultaneously distributing various sound sources such as audible sounds (tones) and announcement sounds to a plurality of callers.

  If each sound of this sound source is prepared for the required number of channels (ch), the equipment scale of the sound source becomes very large. Taking a mobile switch as an example, a ringing tone (RBT) sound source requires more than 1000 channels for a 500,000 subscriber scale. Therefore, a method using a copy (COPY) trunk in which one sound source is provided for each sound source and a necessary number of ATM cells or IP packets transmitted from the sound source are copied and distributed is often used.

  FIG. 1 is a block diagram of a conventional sound source control device. A sound source device 1 that transmits ringing tone (RBT) or the like in STM (Synchronous Transfer Mode) and voice data of the sound source device 1 are converted into IP packets or ATM cells. A packetizing / celling device 3 for copying, a copying device 4 for copying the necessary number of converted IP packets or ATM cells, a line device 71 connected to the calling party with the copied IP packets or ATM cells, 72, and a switch software 6 for controlling each device.

On the other hand, in a sound source device in a conventional STM telephone exchange, a delayed sound source is generated to generate a plurality of delayed sound sources, and the cue function is realized by selecting the one closest to the cue from the address on the memory And a technology that realizes a cue function by selecting an announcement having phase information closest to cue by a reference clock (for example, refer to Patent Documents 1 and 2).
JP-A-4-239254 JP-A-7-177245

  In the conventional system shown in FIG. 1, when the processor 8 connects a sound source to the caller, the original sound source is one and continues to be repeatedly output. There is a problem that it is uncertain at which timing the connection is made, and it cannot be heard from the beginning (first) of the audio content (cannot be cued). This is not only the voice content of a meaningful sentence such as an announcement voice, but also an intermittent sound such as a ringing tone (RBT) (2 seconds of sound and 1 second of silence). When it is time, it is considered a problem because the caller feels a connection delay.

  On the other hand, in the techniques disclosed in Patent Documents 1 and 2, there is a problem that the processing load of the host processor becomes heavy due to the cueing. That is, FIG. 2 is a flowchart showing the processing by the conventional upper software, but when the upper processor connects the sound source to the caller (step S1), the transmission phase of the sound content at that time of the sound source is determined. Reading (step S2), it is necessary to calculate and judge the output of sending out the head of the audio content in the shortest from the read phase information (step S3), and it is necessary to create a path to the device and assign a sound source (step S4, S5).

  The present invention has been proposed in view of the above-described conventional problems, and an object of the present invention is to provide a sound source control method and apparatus with less processing load on a host processor.

  In order to solve the above problems, in the present invention, voice data having a start identifier at the beginning is repeatedly generated, and a different delay amount is added to the voice data to form a packet or a cell, which is copied as many times as necessary. When the sound source needs to be transmitted, only the packet or cell having the same copy path as the packet or cell in which the start identifier is first detected among the copied packets or cells is transmitted to the target user.

  In the sound source control method and apparatus of the present invention, since the cue can be autonomously realized by the start identifier provided at the head portion of the audio data, the processing load on the host processor can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described.

<Overall configuration>
FIG. 3 is a configuration diagram of a sound source control device according to an embodiment of the present invention. In FIG. 3, the sound source control device includes a sound source device 1 that transmits a ringing tone (RBT) or the like in STM, and a plurality of subordinately connected delay devices 21 to 24 that delay the sound data of the sound source device 1 for a predetermined time. A plurality of packetizing / celling devices 30 to 34 for converting voice data of the sound source device 1 and the delay devices 21 to 24 into IP packets or ATM cells, respectively. Here, it is assumed that a delay amount obtained by dividing the audio data length by the number of packetizing / celling devices 30 to 34 is assigned to each of the delay devices 21 to 24. Note that the audio data includes a start ID (identifier) indicating the start position of the audio content, as will be described later. Further, the packetizing / celling devices 30 to 34 are divided into a plurality of IP packets or ATM cells according to the information length of the voice data output from the sound source device 1 and the delay devices 21 to 24, respectively. At this time, the position of the start ID is indefinite depending on the arrival timing of the voice data, and may be included in one IP packet or ATM cell, or may extend over a plurality of IP packets or ATM cells.

  Further, the sound source control device copies the IP packets or ATM cells converted by the packetizing / celling devices 30 to 34 by the number required by the system, and these copying devices 40 to 44, respectively. The start ID of the audio data output from the monitor is monitored, and only the IP packet or ATM cell from the copy device that sent the IP packet or ATM cell containing the start ID first after passing the path is allowed to pass through. The output device 5 to be disconnected, the switch device 6 that sends out the IP packet or ATM cell that is the output of the output device 5 to the line devices 71 and 72 connected to the caller side, and the upper software that controls each device And a processor 8.

<Structure of audio data>
FIG. 4 is a diagram showing an example of the structure of audio data. The voice data b that is digitized by a start IDa provided at the head, followed by a PCM (Pulse Code Modulation) code (μ-law), etc. Followed by silent audio data c, the entire length of which is playback time MT data, which is repeatedly transmitted. The silent audio data c may not exist depending on the type of audio content.

  Here, the start IDa is a data string of about several bytes, and the sound is silent and cannot be discriminated by the listener. Specifically, “7F”, “FF”, “7E”, and the like, which are silent data of PCM codes (μ-law data (ITU-G.711) used in Japan) that are normally used as sound source data Can be configured. For example, a data string such as “FF, 7E, 7E, FF, FF, 7E, 7E, 7E” is used. It should be noted that the data in the voiced sound data b is created and corrected so as not to be the same data string as the start IDa.

<Operation of cueing>
FIG. 5 is a diagram showing an example of the position of the audio data with respect to time. The audio data output from the sound source device 1 precedes in time, and then the audio data output from the delay device 21 and output from the delay device 22. Audio data output from the delay device 23 and audio data output from the delay device 24 continue with a certain delay amount (here, MT / 5 for 5 divisions).

  Here, at time T, when the processor 8 needs to connect to the caller so that the sound source can be heard, the processor 8 instructs all the copy devices 40 to 44 to establish a path toward the output device 5. Then, all the packets (cells) of each delay amount are output to the output device 5. The output device 5 monitors the data of the packet (cell), and the copy device (the copy device connected to the delay device 23 in the example of FIG. 5) that first sent out the packet (cell) that detected the start ID of the voice data. 43 is cut by a path release signal, a packet (cell) of the target copy device is sent to the switch device 6, and voice data is heard from the caller. As a result, it is possible to make the caller hear from the beginning of the audio content.

  FIG. 6 is a flowchart showing a processing example of the processor 8 at the time of the above processing. When the processing is started in order to connect the caller to hear the sound source (step S101), all the copying apparatuses 40 to 40 are started. 44 is instructed to set the path toward the output device 5 and only gives a start instruction to the output device 5 (step S102), so there is almost no processing load on the processor 8.

<Details of output device>
FIG. 7 is a functional block diagram illustrating an internal configuration example of the output device 5. In FIG. 7, the output device 5 receives and multiplexes voice data packets (cells) from the copy devices # 0 to #n, and buffers the packets (cells) multiplexed by the multiplexing unit 51. A buffer unit 52 to be ringed, a filter unit 53 that passes a predetermined packet (cell) buffered in the buffer unit 52 to the switch device 6, and a destination from the packet (cell) buffered in the buffer unit 52 And an address extraction unit 54 that extracts an address including a transmission source ID (identifier), and a start ID detection unit 55 that detects a start ID from a packet (cell) buffered in the buffer unit 52.

  Further, the output device 5 uses the transmission source ID extracted by the address extraction unit 54 as a table address, a ch activation bit I1 indicating that the channel is activated, and a start indicating that the start ID is being detected. A management table 56 having, as fields, an ID detecting bit I2, a start ID detecting position information I3 indicating a position where the start ID is being detected, and a start ID detected bit I4 indicating that the start ID has been detected. ing. The detection of the start ID is halfway because the start ID is at the end of the packet (cell) and straddles the next packet (cell).

  The output device 5 also outputs an OR gate 57 that provides a pass permission signal to the filter unit 53 when the start ID detection unit 55 detects the start ID and for a channel for which the start ID detected bit I4 of the management table 56 is ON. When a start ID is detected, an interface is established between the path open signal distribution unit 58 that sends a path open signal to a copy apparatus other than the transmission source ID from which the start ID is detected, and the host processor 8. And a processor IF 59.

<Operation of output device>
FIG. 8 is a flowchart showing a processing example of the output device 5. In FIG. 8, the output device 5 is activated when the processor 8 needs to be connected in order to hear the sound source from the caller, and starts processing (step S201). When the output device 5 receives a packet (cell) from any of the paths established from all the copy devices # 0 to #n according to an instruction from the processor 8 (YES in step S202), the multiplexing unit 51 receives the packet (cell). The transmission source ID corresponding to the received copy apparatus is set in the header of the packet (cell) (step S203), and the packet (cell) is written in the buffer unit 52 (step S204).

  Next, the address extraction unit 54 extracts an address including the destination and the transmission source ID from the packet (cell) buffered in the buffer unit 52 (step S205). Further, the start ID detection unit 55 reads the data in the management table 56 using the transmission source ID extracted by the address extraction unit 54 as a table address (step S206), and the ch activation bit I1 (all transmission source IDs are stored at the time of activation). It is determined whether or not “ON” is ON (step S207). If the ch activation bit I1 is not ON, the process returns to the packet (cell) reception standby (step S202).

  If the ch activation bit I1 is ON, it is subsequently determined whether or not the start ID detected bit I4 is ON (step S208). (Cell) is passed (step S214), and the process returns to the packet (cell) reception standby (step S202). If the start ID detected bit I4 is not ON, it is determined whether or not the start ID detecting bit I2 is ON (step S209). The detection of the start ID is continued using I3 (step S210). If the start ID detecting bit I2 is not ON, the start ID continuation detection (step S210) using the start ID detecting position information I3 is skipped.

  Next, it is determined whether or not the start ID is detected by the start ID detection unit 55 (step S211). If detected, the start ID detected bit I4 of the management table 56 is written to ON (step S212), and the path release signal distribution is performed. The unit 58 sends a path release signal to the copy apparatus other than the transmission source ID from which the start ID is detected (step S213). Then, the filter unit 53 passes the corresponding packet (cell) (step S214), and returns to the packet (cell) reception standby (step S202).

  If the start ID is not detected, it is determined whether or not the start ID is in the middle (step S215). If the start ID is in the middle, the start ID detecting bit I2 of the management table 56 is turned ON and the start ID is turned on. The position information is written in the detecting position information I3 (step S216), and the process returns to the packet (cell) reception standby (step S202). If the start ID is not halfway, the writing of the start ID detecting bit I2 and the start ID detecting position information I3 (step S216) is skipped.

  In the above-described embodiment, one output device 5 is provided. However, a plurality of output devices 5 may be provided to perform operations similar to those of the above-described embodiments. That is, each output device 5 selects a packet (cell) from the copy device (40-44) that first detected the start ID, sends it to the line device (71, 72) side, and sends it to another copy device (71). 40 to 44), an instruction to release the packet (cell) to the own device (5) is not given. Thereby, for example, the output of the copy device 42 is selected by the first output device 5, and the output of the copy device 44 is selected by the second output device 5. Also in this case, the sound source device 1 can be shared as one.

  As described above, since the cueing of the voice data to the caller can be realized by one sound source device, and the processor (upper software) can be realized without reading and determination processing of the sound source device, the processing load A cueing function that does not increase can be provided.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments, various modifications and changes may be made to the embodiments without departing from the broad spirit and scope of the invention as defined in the claims. Obviously you can. In other words, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

Hereinafter, various forms of the present invention will be additionally described.
(Appendix 1) Repeatedly generates audio data with a start identifier at the beginning,
Add a different amount of delay to the above audio data, packetize it or make it into a cell, copy it as many times as necessary,
A sound source control method characterized in that when a sound source needs to be transmitted, only a packet or cell having the same copy path as the packet or cell in which the start identifier is first detected among the copied packets or cells is transmitted to the target user. .
(Supplementary note 2) The sound source control method according to supplementary note 1, wherein the start identifier is configured by combining silence vicinity data of a PCM code.
(Supplementary Note 3) A sound source device that repeatedly generates audio data having a start identifier at the beginning,
A plurality of delay devices for delaying the audio data for a predetermined time;
A plurality of packetizing / celling devices for converting the outputs of the sound source device and the delay device into packets or cells, respectively;
A plurality of copy devices for copying the necessary number of converted packets or cells, respectively;
When it is necessary to send a sound source, the start identifiers of the data output from these copy devices are monitored, and the packet or cell from the copy device that sent the packet or cell for which the start identifier was first detected after the path connection was sent A sound source control device comprising: an output device that passes only the target toward the target user and cuts the other paths.
(Additional remark 4) The switch apparatus which sends out the packet or cell which is the output of the said output apparatus to the circuit | line apparatus connected with the caller side,
The sound source control device according to appendix 3, further comprising a host processor for controlling each device.
(Appendix 5) The output device is
A buffer unit for buffering packets or cells of audio data received from the copying apparatus;
An address extraction unit for extracting an address including a transmission source identifier from the packet or cell buffered in the buffer unit;
A start identifier detection unit for detecting a start identifier from a packet or cell buffered in the buffer unit;
Note that the start identifier detection unit includes a filter unit that allows the packet or cell buffered in the buffer unit to pass through the channel corresponding to the source identifier of the packet or cell in which the start identifier is detected. 5. The sound source control device according to any one of 3 and 4.
(Supplementary note 6) The sound source control device according to any one of supplementary notes 3 to 5, wherein the start identifier detection unit detects a start identifier across a plurality of packets or cells.
(Supplementary Note 7) The transmission source identifier extracted by the address extraction unit as a table address,
A channel activation bit indicating that the channel is activated; and
A start identifier detecting bit indicating that the start identifier is being detected;
Start identifier detecting position information indicating a position where the start identifier is being detected;
The sound source control device according to any one of appendix 5 or 6, further comprising a management table having a start identifier detected bit indicating that detection of the start identifier is completed in a field.

It is a block diagram of the conventional sound source control apparatus. It is a flowchart which shows the process by the conventional high-order software. It is a block diagram of the sound source control apparatus concerning one Embodiment of this invention. It is a figure which shows the structural example of audio | voice data. It is a figure which shows the example of the position with respect to the time of audio | voice data. It is a flowchart which shows the process example of a processor. It is a functional block diagram which shows the internal structural example of an output device. It is a flowchart which shows the process example of an output device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sound source device 21-24 Delay apparatus 30-34 Packetization / cell formation apparatus 40-44 Copy apparatus 5 Output apparatus 51 Multiplexing part 52 Buffer part 53 Filter part 54 Address extraction part 55 Start ID detection part 56 Management table 57 OR gate 58 Path open signal distribution unit 59 Processor IF
6 Switch device 71, 72 Line device 8 Processor

Claims (3)

Repeatedly generate audio data with a start identifier at the beginning,
Add a different amount of delay to the above audio data, packetize or cell, copy as many times as necessary
When it is necessary to send a sound source, a sound source control method is characterized in that only a packet or cell having the same copy path as the packet or cell in which the start identifier is first detected is sent to the target user among the copied packets or cells. . A sound source device that repeatedly generates audio data with a start identifier at the beginning,
A plurality of delay devices for delaying the audio data for a predetermined time;
A plurality of packetizing / celling devices for converting the outputs of the sound source device and the delay device into packets or cells, respectively;
A plurality of copy devices for copying the necessary number of converted packets or cells, respectively;
When it is necessary to send a sound source, the start identifiers of the data output from these copy devices are monitored, and the packet or cell from the copy device that sent the packet or cell for which the start identifier was first detected after the path connection was sent A sound source control device comprising: an output device that passes only the target toward the target user and cuts other paths. The output device is
A buffer unit for buffering packets or cells of audio data received from the copying apparatus;
An address extraction unit for extracting an address including a transmission source identifier from the packet or cell buffered in the buffer unit;
A start identifier detection unit for detecting a start identifier from a packet or cell buffered in the buffer unit;
A filter unit that allows the packet or cell buffered in the buffer unit to pass through the channel corresponding to the source identifier of the packet or cell in which the start identifier is detected by the start identifier detection unit. Item 3. The sound source control device according to Item 2.

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