JPH05191529A - Sound switching/transmission system - Google Patents

Abstract

PURPOSE:To avoid errorneous recognition at an incoming terminal by permitting sound and FAX data to constitute individual frames and preventing switching noise even at the time of transmission when they are individually synchronized and even when the same frame is used. CONSTITUTION:A FAX repeat transmission part 202 recognizes an input signal 220 to be FAX data and transmits it to a sound encoding part 201 through a transmission switching part 203. The encoding part 201 transmits a switching notice in a means which does not affect previously decided sound to a second device 5 as a signal 240 by a private line 9 through a transmission switching part 204. The switching notice is detected in a sound decoding part 209 and sound is made silent and is noticed to a transmission switching control part 213. The control part 213 transmits a response to a sound encoding part 215 and transmits a notice signal 230 from a transmission switching part 214 to the reception-side of a first device 4 through the transmission line 9. A sound decoding part 207 detects the reception of the response and sound is made silent. Thus, occurrence of noise can be prevented at the time of switching sound to FAX.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching transmission system for voice and facsimile data.

[0002]

2. Description of the Related Art A conventional example will be described below with reference to FIGS. 7 shows a configuration of the communication network, and FIG. 8 shows a processing flow in the communication network of FIG.

As shown in FIG. 7, a telephone 2 and a facsimile machine (FAX) 1 are connected to a private branch exchange (PB) on the calling side.
X) 3 to connect to the first device 4, the receiving side connects the telephone 8 and the FAX 7 to the second device 5 via the PBX 6, and connects the first device 4 and the second device 5 with the dedicated line 9. If you configure the network like this to communicate with terminals such as telephones and faxes, in the leased line section, if the voice from the telephones 2 and 8 compresses the area, in the case of fax 1 and 7, only the actual data is extracted and relayed. Corresponds to communication means to perform transmission,
As a transmission method, the dedicated line 9 is effectively used by switching transmission.

As shown in FIG. 8, the processing flow of this switching transmission is such that the caller side and the callee side perform telephone transmission / reception.
When making a call-> FAX switching (50) on the calling side, the first device 4 performs FAX data recognition (51) of the received data,
Voice → FAX switching (52) is performed to form a FAX frame and the FAX frame is transmitted to the dedicated line 9.

The second device 5 on the called side receives an F from the leased line 9.
AX frame reception (53) is performed, and confirmation is made of establishment of FAX synchronization (55) during the backward protection time of the FAX frame and loss of voice synchronization (54) during the forward protection time of the FAX frame.

If the second device 5 recognizes the FAX data (56) during the protection time of the earlier confirmation, the second device 5
To switch voice → FAX (57), and call → F on the receiving side.
Switch to AX (58) to receive.

In the above case, as shown in FIG. 8, the normal voice is switched to the FAX data and the FAX frame is received (53).
During the period from the timing of performing the process to the timing of completing the FAX synchronization and completing the voice → FAX switching (57), noise is generated during the forward protection time on the receiving side because invalid data is treated as valid data. Further, even if the frames having the same structure are used, the same noise is generated due to the difference in the data content, which may cause an unpleasant feeling to the listener, and may cause an erroneous recognition at the receiving side terminal.

Further, even for push button tones, when voice is highly efficient encoded (for example, 16 kbps, 8 kbps or less) and transmitted, it cannot be transmitted as voice due to quantization distortion, and the same applies when it is transmitted as a data code. Noise is generated and the listener becomes uncomfortable.

[0009]

Therefore, in the conventional voice switching transmission system, there is a problem that noise is generated on the receiving side when voice and FAX data are switched.

An object of the present invention is to provide a method for preventing noise generated on the incoming side when switching between voice and FAX data.

[0011]

In order to achieve the above object, according to the present invention, in the case of voice data, wide area compression is performed, in the case of facsimile data, only actual data is taken out and relayed, and in the case of push button tone. Is a device that performs coded switching transmission, and if the frame format differs depending on the data type, the sending side notifies the switching side 12 of the switching notice 12 after performing facsimile data recognition 11 using a specific code or a specific bit. On the receiving side, after receiving the switching advance notice 12 of the switching advance notice 12, the voice muting 14 is performed and the response return 15 is notified to the transmitting side, and the transmitting side receives it as the response reception 16 of the response return 15 ..

Further, in the case of voice data, it is wide-area compressed, in the case of facsimile data, only the actual data is taken out for relay transmission, and in the case of push button tone, it is coded and switched for transmission. When the formats are the same, the caller side performs the facsimile switching 33 from the voice after the voice / facsimile identifier setting 32 in the data, and the callee side receives the data 34 of the identifier setting 32 and then determines the identifier 35.
Is configured to do.

[0013]

As shown in FIGS. 1 and 2, the present invention compresses the area in the case of voice data, extracts only the actual data in the case of facsimile data and relays it, and encodes and switches it in the case of push button tone. In the transmitting device, when the frame format differs depending on the data type, the calling side adds a switching notice 12 to notify the opposite side, and the receiving side receives the switching notice 12 of the switching notice 12 and the voice silence 14 And then return the reply
Notify 15 to the calling party.

Therefore, the sender receives the response of the response return 15
By receiving 16, it is possible to prevent noise generation when switching from voice to facsimile.
Further, when the frame format is the same depending on the data type, the transmitting side sets the identifier 32 for voice or facsimile in the data.

Therefore, noise can be prevented from occurring at the time of switching by discriminating 35 the identifier 32 on the receiving side.

[0016]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 are diagrams for explaining the first switching transmission system, FIG. 1 shows a processing flow of the first embodiment, FIG. 2 shows its circuit, and FIG. 3 shows a frame format used for that circuit. Indicates.

FIGS. 4 to 6 are diagrams for explaining the second switching method. FIG. 4 shows the processing flow of the second embodiment, FIG. 5 shows its circuit, and FIG. 6 shows its circuit. Shows the frame format used.

In FIGS. 3 and 6, (a) is a voice frame and (b) is a fax frame. In the case of FIG. 3, the audio frame (a) has a synchronization bit (F) at the beginning of the audio compression data.
Is added to form one frame, and the FAX frame (b) forms one frame by adding F to the head of the extracted facsimile data (FAX data). The two frames (a) and (b) are configured to have different frame lengths.

The two frames in this case have different formats. Therefore, the confirmation of which of the voice and the fax is in the receiving state is performed by establishing the mutual synchronization by the advance notice of switching.

In the case of FIG. 6, both the voice frame (a) and the fax frame (b) are added with F and an identifier (ID) set separately before the voice compression data or facsimile data, and have the same length. I am trying to compose the frame.

The two frames in this case have the same format. Therefore, the identification of the reception state of voice and FAX is performed by the identifier (ID).

The processing flow of the embodiment and its circuit will be described below with reference to FIGS. 1 and 2 and FIGS. 4 and 5. [First Method] As shown in FIGS. 1 to 3, in a transmission method using a frame format having a different configuration, (1) When switching from a telephone to FAX communication, first, the telephone is switched from the telephone to the FAX ( 10) is performed and F
The input signal 220 from the AX 1 passes through the private branch exchange 3 and is input to the first device 4.

(2) The input signal 220 is input to the voice coding unit 201 and the FAX relay transmission unit 202, and the FAX relay transmission unit 20
2 recognizes that the input signal (220) is FAX data (1
1) Then, the transmission switching control unit 203 is notified.

(3) The transmission switching control unit 203 notifies the voice encoding unit 201 of the transmission of the switching advance notice signal, and the voice encoding unit 201 outputs the voice of the predetermined specific code or the polarity of the specific bit. Notice of switching by means that does not affect
(12) is sent to the transmission switching unit 204, and further sent to the receiving side via the dedicated line 9.

(4) The second device 5 receives the switching advance notice (13) sent from the first device 4 and receives the signal.
240 is input to the voice encoding unit 209 and the FAX relay receiving unit 210. The voice decoding unit 209 detects the switching notice (12), silences the voice (14), and notifies the transmission switching control unit 213.

(5) The transmission switching control unit 213 notifies the voice encoding unit 215 of the response return (15) to the switching notice (12) by the detection notice of the switching notice (12). At this time,
The voice encoding unit 215 sends the switching advance notice signal 230 to the transmission line 9 via the transmission switching unit 214 by means that does not affect the voice such as the polarity of the specific code or the specific bit that is determined in advance.

(6) On the receiving side of the first device 4, the second device 5
The signal 230 from the voice decoding unit 207 and the FAX relay receiving unit 2
08, and the voice decoding unit 207 sends the switching notice (1
When the response reception (16) to 2) is detected, the voice is muted and the transmission switching control unit 203 is also notified.

(7) The transmission switching control unit 203 notifies the transmission switching unit 204 of switching from voice to FAX by the detection notification of the response reception (16), and the transmission switching unit 204
Then, the voice → FAX switching (17) is performed and the data is transmitted to the second device 5.

(8) In the second device 5, the signal 240 from the first device 4 is input to the voice encoding unit 209 and the FAX relay receiving unit 210 to perform FAX frame reception (18), and the FAX relay receiving unit 210. Then, the FAX synchronization establishment (19) is detected and the reception switching control unit 211 is notified.

(9) The reception switching control unit 211 uses the FAX
In response to the detection notification of synchronization establishment (19), the reception switching unit 212 is notified of voice → FAX switching (20) to switch from voice transmission to FAX data transmission and also to the transmission switching control unit 21.
Notify 3.

(10) The transmission switching control unit 213 uses the FAX
Upon notification of detection of synchronization establishment (19), the transmission switching unit 214 is notified of the switching, and a signal is transmitted from the telephone to the transmission of the FAX signal.
Switch 230.

(11) On the receiving side of the first device 4, the second device 5
Signal 230 from the voice decoding unit 207 and the FAX relay receiving unit 2
It is input to 08, the FAX relay receiving unit 208 detects the establishment of FAX synchronization (19), and notifies the reception switching control unit 205.

(12) The reception switching control unit 205 uses the FAX
Upon reception of the synchronization establishment (19) detection notification, the reception switching unit 206 is notified of the switching, switching from voice to FAX, and switching from telephone to FAX (21) for reception.

As described above, by notifying the advance notice of switching before switching, it becomes possible to switch from a telephone that is capable of preventing noise due to switching to a facsimile to a fax, and conversely for switching from fax to voice. It becomes possible by the same procedure. [Second Method] As shown in FIG. 4 to FIG. 6, in the transmission method using the same frame format, (1) When switching from telephone to FAX communication, first, the caller makes a telephone call → FAX (30 ) Is performed,
The input signal 220 switched from the telephone to the FAX passes through the private branch exchange 3 and is input to the first device 4.

(2) The input signal 220 is the same as the speech coding unit 250 and F
When the input signal 220 is input to the AX relay transmission unit 252 and the input signal 220 changes from voice to FAX data, the FAX relay transmission unit 252.
Then, FAX data recognition (31) is performed, and the recognition result is notified to the transmission switching control unit 253 and the identifier setting unit 254.

(3) The identifier setting unit 254 sets the identifier (32) according to the polarity of the specific code determined in advance in response to the notification from the FAX relay transmission unit 252. Then, the identifier is put on the FAX data sent from the transmission switching unit 253, and the voice → FAX switching (33) is performed.

(4) In the second device 5, after the signal 240 from the first device 4 is received (34) by the identifier discriminating section 260,
It is input to the voice decoding unit 261 and the FAX relay receiving unit 262. (5) The identifier discriminating unit 260 discriminates the identifier (35) in the input signal 240. In the case of voice, the reception switching unit 264 is not switched, and in the case of FAX data, the muting unit 263 and the reception switching unit 264. To notify.

(6) The silencer 263 silences the audio data to the reception switching unit 264 in response to the notification signal (36),
The reception switching unit 264 performs voice → FAX switching (37). (7) When the identifier discriminating unit 260 discriminates that the voice is in the FAX transmission state, the transmission from the FAX signal is returned to the transmission of the voice signal.

(8) It should be noted that the circuit (F
AX relay transmission unit 268-identifier setting unit 265) and the receiving side circuit of the first device (identifier discrimination unit 259-transmission switching unit 25)
6) is the same as the above operation.

As described above, it is possible to switch between voice and FAX in frame units.

[0041]

As is apparent from the above description, according to the present invention, in the case of voice, the area compression is carried out, and in the case of facsimile, only the actual data is taken out and the relay transmission is carried out, thereby corresponding to the communication means. In a device that transmits by switching the transmission method and makes effective use of the leased line, separate frames are used for voice and facsimile data, and the same frames are used as they are transmitted separately in synchronization. In the case of any of them, it is possible to prevent switching noise, to make the listener uncomfortable, to eliminate false recognition at the receiving terminal, and to be able to handle push button tones other than facsimile. Play.

[Brief description of drawings]

FIG. 1 is a diagram showing a first processing flow of the present invention.

FIG. 2 is a diagram showing a circuit of a first exemplary embodiment of the present invention.

FIG. 3 is a diagram showing a frame format used in the first embodiment of the present invention.

FIG. 4 is a diagram showing a second processing flow of the present invention.

FIG. 5 is a diagram showing a circuit of a second exemplary embodiment of the present invention.

FIG. 6 is a diagram showing a frame format used in a second embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a communication network.

FIG. 8 is a diagram showing an example of a conventional processing flow.

[Explanation of symbols]

 11 is FAX data recognition function 12 is switching advance notice function 13 is switching advance notice receiving function 14 is voice silence function 15 is response returning function 16 is response receiving function 17 is voice-facsimile switching function 31 is facsimile data recognition function 32 is identifier setting Function 33 is voice → facsimile switching function 34 Data receiving function, 35 is identifier discrimination function

Claims (2)

[Claims] 1. A device for compressing a wide area in the case of voice data, extracting only real data in the case of facsimile data for relay transmission, and coding and switching transmission in the case of push button tones for frame transmission depending on the data type. If the formats are different, the sending side uses the specific code or the specific bit to recognize the facsimile data (11) and then notifies the switching side notice (12) to the opposite side, and the receiving side notifies the switching side notice (12). Receiving notice of switching
After (13), the voice is muted (14) and the response return (15) is notified to the calling side, and the calling side receives it as the response reception (16) of the response return (15). Audio switching transmission method. 2. A device for performing wide area compression in the case of voice data, extracting only real data in the case of facsimile data for relay transmission, and coding and switching transmission in the case of push button tones for frame transmission depending on the data type. If the formats are the same, the sender sets the identifier of voice or facsimile in the data (32) and then switches from voice to facsimile (3
3) The voice switching transmission method is characterized in that the receiving side performs the identifier discrimination (35) after receiving the data (34) of the identifier setting (32).