JPH02246464A - Voice data separation system - Google Patents

Abstract

PURPOSE:To reduce the circuit scale by providing a voice data separation section to a reception section of one channel and switching the channel in response to the result of discrimination of a channel discrimination section. CONSTITUTION:A channel discrimination section 5 receives a code commanding the kind of the transmission data extracted from each transmission data from 1st and 2nd synchronizing sections and discriminates whether or not the voice data is included in the transmission data of any channel. A channel changeover section 6 is subject to changeover control in response to the result of discrimination of the channel discrimination section 5, the transmission data of one channel including the voice data is supplied to the 2nd synchronization section 4 to switch the connection so that the transmission data of the other channel not including the voice data is supplied to the 1st synchronization section 3. Then a voice data separation section 7 separates the voice data included in the transmission data from the 2nd synchronization section 4 and the voice data is fed to a voice CODEC 8. Thus, the circuit scale is reduced.

Description

Detailed description of the invention The purpose of this system is to reduce the number of circuits provided without having a 2-channel transmission path, and transmit data including audio data on one channel of a 2-channel transmission path, and transmit data that does not include audio data on the other channel. In an audio data separation method that separates audio data from transmission data of the one channel, first and second synchronization units provided for each channel synchronize the supplied transmission data; Each of the two synchronization units is supplied with a code instructing the type of transmission data extracted from each transmission data,
a channel determination section that determines which channel's transmission data includes audio data; and a channel determination section that determines which channel's transmission data includes audio data; a channel switching unit that switches the connection so that the transmission data of the other channel that does not include audio data is supplied to the first synchronization unit; and the audio included in the transmission data from the second synchronization unit. and an audio data separation unit that separates data.

[Industrial application field]

The present invention relates to an audio data separation method, and more particularly to an audio data separation method for separating audio data when receiving composite media such as images and audio transmitted using a two-channel transmission path.

Recently, 64 on l5DN (Integrated Service Digital Network)
There is a need for a transmission system that uses two Kbps lines to transmit composite media of applications such as facsimile for image/audio history.

In the case of the above-mentioned composite media, audio data is transmitted on only one of the two channels and not on the other channel, but it is not uniquely determined which of the two channels contains the audio data.

[Conventional technology]

In conventional devices for receiving composite media, since it is not known which of the two channels of transmission paths the audio data is present in, the receiving section for each channel is provided with an image data separating section and an audio data separating section.

[Problem to be solved by the invention]

In the conventional system, since the receiving section of each channel has an audio data separating section, the circuit scale becomes large, and there is a problem that the audio data separating section is not used in channels where no audio data exists and is wasted.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an audio data separation method that reduces the circuit scale without having an unnecessary audio data separation section.

[Means to solve the problem]

FIG. 1 shows a diagram of the principle of the system of the present invention.

In the figure, transmission data including audio data is transmitted to one of the two channels 1 and 2, and
Transmission data that does not include audio data is transmitted on the other channel.

1st. The second synchronization units 3 and 4 are provided for each channel and synchronize the supplied transmission data.

The channel determination unit 5 selects the first. Each of the second synchronizers is supplied with a code indicating the type of transmission data extracted from each transmission data, and determines which channel's transmission data includes audio data.

The channel switching unit 6 is controlled to switch according to the judgment result of the channel judgment unit 5, and supplies the transmission data of one channel containing audio data to the second synchronization unit 4, and transmits the transmission data of the other channel not containing audio data. The connection is switched to supply the transmission data to the first synchronization 3.

The audio data separation section 7 separates the audio data included in the transmission data from the second synchronization section 4, and this audio data is supplied to the audio C0DEC8.

(Operation) In the present invention, the channel determining section 5 determines which channel's transmission data includes audio data, and according to the result, the transmission data including the audio data is supplied to the second same section 4. In order to control the switching of the channel switching section 6, the audio data separation section 7 only needs one circuit in this way, and there is no unnecessary audio data separation section. Also, in the conventional system, the channel determination section 5 is necessary, and the circuit scale is reduced compared to the conventional system.

〔Example〕 FIG. 2 shows a block diagram of one embodiment of the system of the present invention.

In the figure, 10 and 11 are transmission paths, and transmission data such as image data that does not include audio data is transmitted to one channel, and transmission data such as audio data and image data is transmitted to the other channel. .

Here, the frame format of the transmission data consists of 640 bits represented by bit numbers 1-8 and octet numbers 1-80, as shown in FIG. The portion where each octet has the same bit number is called a subchannel. The eighth subchannel is provided with pattern data FAS for frame synchronization, code data BAS representing the type and transmission speed of multiplexed data, and an application channel AC used for facsimile and the like.

Here, the value of BAS is '01010110't'
,! Audio data enters the first and second subchannels,
This indicates that image data is input to the third to seventh subchannels. Further, when the value of BAS is '01010001', it indicates that image data is included in the first to seventh channels and audio data is not included.

Each of the transmission lines io and ii is connected to a terminal a of the channel switching section 12.
, b, respectively. The channel switching section 12 switches the connection between the terminals a and c, and between the terminals b and d, and between the terminals a and d, and between the terminals b and C, depending on the IIJtIl signal from the channel determination section 15. The transmission data output from these terminals c and d are supplied to synchronization sections 13 and 14, respectively.

Each of the synchronization units 13 and 14 detects the FAS of the transmission data, extracts the BAS, and supplies it to the channel determination unit 15.

The channel determination unit 15 receives the information from the synchronization unit 13 (7) that the BAS is “01010001 'r, f251j11 unit 14
In order to leave the connection state of the channel switching unit 12 as it is when the BAS is '0101011G',
The value of the control signal is maintained and the BAS signal v0 from the synchronization section 13 is
1010110vte, from the synchronization section 15 (7) BAS is '
01010001', channel switching unit 1
The value of the control signal is changed in order to switch the connection state of 2.

As a result, the synchronization unit 13 is always supplied with transmission data that does not include audio data, and the synchronization unit 15 is always supplied with transmission data that includes audio data.

The transmitted data passing through the synchronization section 13 is transferred to the image data separation section 16.
The image data in the first to seventh subchannels of the transmission data is separated here and sent to the image flcODEc17.
supplied to

The transmitted data passing through the synchronization unit 14 is transferred to the image data separation unit 18
and is supplied to the audio data separation unit 19, and the image data in the third to seventh subchannels of the transmission data is separated by the image data separation unit 18 and supplied to the image CODEC 17,
The audio data separator 19 separates the audio data in the first and second channels of the transmission data and supplies the separated audio data to the audio C0DEC 20 .

Image C0DEC17 decodes the image data and sends it to terminal 2.
1 to an image processing circuit (not shown), and audio GOD
The EC 20 decodes the audio data and supplies it to an audio processing circuit (not shown) from a terminal 22.

In this way, only one circuit is required for the audio data portion II1 section 19.
There is no needless audio data separation section. Also, in the conventional method, depending on the BAs value of the transmission data of each channel,
The channel determining section 15 is necessary to determine in which channel image data and audio data are present, and the circuit size and structure of the system shown in FIG. 2 are reduced compared to the conventional system.

〔Effect of the invention〕

As described above, according to the audio data separation method of the present invention, there is no need to provide an unnecessary audio data separation section (the circuit size is reduced compared to the conventional method, and it is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the method of the present invention, FIG. 2 is a block diagram of an embodiment of the method of the present invention, and FIG. 3 is a diagram showing the frame format of transmission data. In the figure, 1.2.10.11 is a transmission path, 3 is a first synchronization section, 4 is a second synchronization section, 5.15 is a channel judgment section, 6.12 is a channel switching section, and 7.19 is a channel switching section. Audio data separation unit, 8.20 is audio C0DEC. 16 and 18 indicate an image data separation unit, and 17 indicates an image C0DEC. This Sanskrit n month method 7゛D1, 7 figure 2 figure

Claims (1)

[Claims] Transmission data including audio data is transmitted to one channel of the two-channel transmission path (1, 2), transmission data not including audio data is transmitted to the other channel, and In an audio data separation method for separating audio data from transmission data of a channel, first and second periodic parts (3, 4) provided for each channel and synchronizing the transmission data supplied; Second
a channel determination unit (5) which is supplied with a code indicating the type of transmission data extracted from each transmission data by each of the synchronization units (3, 4), and determines which channel's transmission data includes audio data; and the transmission data of the one channel containing audio data is supplied to the second synchronizing unit (4) under switching control according to the judgment result of the channel judgment unit (5), and the transmission data of the one channel not containing audio data is controlled to The transmission data of the channel is synchronized with the first synchronization (3)
Channel switching unit (6) that switches the connection to supply
and an audio data separation unit (7) that separates audio data included in the data transmitted from the second synchronization unit (4).