JPS6345949A - Signal transmission system - Google Patents

Abstract

PURPOSE:To attain transmission of digital information with a multi-frequency signal by providing a transmission/reception means capable of sending/receiving dial information with the multi-frequency signal in a vocoder, in the signal transmission system which executes voice communication by the use of a linear predicting coded digital vocoder. CONSTITUTION:For example, a vocoder 10 is provided with a linear predicting section (LPC) 11, a control section (CONT) 12, a reception section (MFRCV)13 for MF dial signal and a MF dial signal transmission section (MFDRV)14. The CONT 12 inserts the information processed to each information section in the frame to constitute the transmission frame between vocoders 10, 20, extracts the information of the reception frame and sends it to the LPC 11, MFRCV 13 and MFDRV 14. The MFRCV 13 receives the MF dial signal sent from the TEL 30, converts it into a digital signal 2 out of 5 and output it. the MFDRV 14 at the sender side is used to be connected to the exchange and in this case, the 2 out of 5 signal from the CONT 12 is converted into the MF signal and sent to the exchange. In this case, the connection corresponding to the reception side MFDRV24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal transmission system, and more particularly to a signal transmission system that makes it possible to transmit multi-frequency signals for telephone dialing using a linear predictive coding digital voice coater (hereinafter referred to as a vocoder).

[Conventional technology]

Conventionally, this type of signal transmission method using a vocoder transmits the results of multi-point sampling of the dial signal from the telephone (hereinafter referred to as the device) and the pulse signal itself that turns on and off the DC current of the dial signal between exchanges. Was.

FIGS. 4(a) and 4(b) are block diagrams showing an example of a conventional signal transmission system.

In Fig. 4(a), totals a and 1b are the conventional vocoder 2.
A, a modem (hereinafter referred to as a modem) 3a, a conventional vocoder 2b, and a modem 3b are connected to each other, and in FIG. and modem 3c and modem 3d and conventional vocoder 2d
A case is shown in which the switch 4 is connected to the switch 4 (hereinafter referred to as SW).

FIG. 4(c) is a frame configuration diagram showing an example of a frame configuration in a connection mode of signals transmitted and received between vocoders in a conventional signal transmission system.

As shown in the figure, the dial information in the conventional signal transmission system is transmitted by inserting dial pulse "1' or "0" as is into the 1st to 36th bit positions of the spectrum information section on the frame, and transmitting it to the other party's vocoder. was sent to the other party's vocoder and played back as a dial pulse.

[Problem that the invention seeks to solve]

The transmission path using a vocoder using the conventional signal transmission method described above cannot transmit dial information using multi-frequency signals (hereinafter referred to as MP multiplied signals), so dial information can be sent and received in a short period of time, and the communication path within the exchange can be quickly transferred. could not be set. Furthermore, since the MF multiplied signal cannot be sent, there is a drawback that connection with a voice mail device or the like controlled by the MP multiplied signal cannot be made.

[Means for solving problems]

The signal transmission system of the present invention is a signal transmission system that performs voice communication using a linear predictive coding digital vocoder.
The linear predictive coding digital vocoder is provided with a transmitting/receiving means capable of transmitting and receiving dial information using a multi-frequency signal corresponding to a telephone number.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
2A and 2B are frame configuration diagrams showing examples of frame configurations of signals transmitted and received between the vocoders in FIG. 1 in a call mode and a connection mode, respectively; FIG.

In FIG. 1, the vocoder 10, modems 60, 70 . It is connected via the vocoder 2o and 5W40.

First, the vocoder will be explained with reference to FIG.

Each vocoder, for example, the vocoder 1o, includes a linear prediction unit (hereinafter referred to as LPC) 11 and a control unit (hereinafter referred to as C0NT).
12, MF dial signal receiving section (hereinafter referred to as MFRCV) 13, and MP dial signal transmitting section (hereinafter referred to as MFDRV).
) 14.

The LPCII analyzes the analog signal from the device 30 into amplitude information, spectrum information, and pitch information, generates a digital signal according to a predetermined procedure, or reproduces the analog signal from the input digital information to the device 30.

C0NT12 inserts the processed information into each information part of the frame to form a transmission frame between the vocoders 10 and 20, and also extracts the information of the received frame and transmits it to the LPCI
1. MFRCV13. Send to MFDRV14.

MFRCV13 is the MF dial (
It receives analog (analog) signals, converts them into 2-out-of-5 digital signals, and outputs them. This output is continuously output while receiving the MF dial signal and is sent to C0NT12.

The MFDRV 14 on the transmitting side is used when connecting to an exchange, and in that case converts the 2-out-of-5 digital signal provided from C0NT 12 into an analog MF signal and sends it to the exchange. The output of the MFDRV 14 is continuously output until the input of the 2-out-of-5 digital signal stops. The connection in this case corresponds to the receiving side MFDRV24.

Next, a signal frame structure for transmission/reception of the vocoder of this embodiment will be explained.

In general, voice communication using a telephone is broadly classified into two types: a connection mode (the telephone is on/off-hook, a dial transmission state), and a call mode (a telephone call state).

In FIG. 2(b), the numerical information of the dial number is inserted into the 1st to 4th bit part of the spectrum information part 82 in the connection mode, and the identification bit ID part for MF dial signal transmission is inserted into the 37th to 39th bit part. 81 has a special code ``'11''
1" is inserted, and the amplitude information section 80 displays the amplitude value of the call voice signal, but the first 3 bits are "111".
” is inserted.

In FIG. 2(a), in the call mode, all bits 1 to 39 of the spectrum information section can be used.

FIG. 3 is a diagram showing an example of signal waveforms and frame configurations on the transmitting side and receiving side when transmitting the MF dial signal from the telephone set in FIG. 1 to the exchange.

Next, the operation of this embodiment will be explained.

First, C0NT12j, t, position 3 of the transmitting side vocoder 10
MFRCVl which received MP dial signal 100 from 0
Send the values ``2'' and ``5'' obtained from 3 to frame 11.
o (corresponding to Fig. 2(b)) in bit positions 1 to 4 (send the same number twice to increase reliability), and 37 to 3
"111" indicating that MP dial information is being transmitted is inserted in the 9th bit and 47th to 49th bit positions, and the opposing vocoder 2
Send to o.

Receiving vocoder 20 received via modem 60.70
C0NT22 receives the received frame 120 (Fig. 2(b)
) If "111" is detected in bits 37 to 39 and bits 47 to 49 of Activate the sending MFDRV24.

The output of MFDRV24 is analog MF via the telephone line.
The dial signals are sent to the 5W40 as "2" and "5".

This MP dial signal can be transmitted not only during the connection mode but also during the call mode.

〔Effect of the invention〕

As explained above, in the present invention, by providing an MP double signal transmitting/receiving circuit that can transmit and receive dial information using MF signals in a vocoder, dial information can be transmitted between vocoders using MF signals, and dial information of MF signals can be transmitted. By sending and receiving, it is possible to set up a communication path within the exchange in a shorter time than in the case of conventional pulse dialing. or,
This has the advantage that devices controlled by MP double signals, such as voice mail devices, can be connected to the exchange and used.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
a) and (b) are frame configuration diagrams showing an example of the frame configuration of signals transmitted and received between the vocoders in Figure 1 in call mode and in connection mode, and Figure 3 is a frame configuration diagram showing an example of the frame configuration of signals transmitted and received between the vocoders in Figure 1. A diagram showing an example of signal waveforms and frame configurations on the transmitting side and receiving side when transmitting an MF dial signal to an exchange,
Figures 4 (a) and (b) are block diagrams showing an example of a conventional signal transmission system, and Figure 4 (C) is a connection mode for signals transmitted and received between vocoders in the conventional signal transmission system. FIG. 2 is a frame configuration diagram showing an example of a frame configuration of FIG.

Claims (1)

[Claims] In a signal transmission method for performing voice communication using a linear predictive coding digital voice coater, the linear predictive coding digital voice coater includes a transmitting/receiving means capable of transmitting and receiving dial information using a multifrequency signal corresponding to a telephone number. A signal transmission method characterized by: