JPH06121350A - Transmission method for pb signal transmission confirmation tone - Google Patents

Abstract

PURPOSE:To easily adjust a confirming tone volume by decreasing a line interface circuit scale in a digital electronic exchange so as to easily generate the confirming one thereby preventing the reduction in the transmission processing capability. CONSTITUTION:A call processing control circuit 5 controls a time division exchange circuit 6 when an extension telephone set 1 whose selection signal system is not the PB signal system makes dialing to a line employing the PB signal system to form two channels between a PB signal transmitter 7 and line interface circuits 8,10 and the PB signal transmitter 7 and an extension interface circuit 3. Simultaneously the call processing control circuit 5 gives an attenuated value to digital attenuators/amplifiers 9. A PB signal generated by the PB signal transmitter 7 and attenuated by the digital attenuators/ amplifiers 9 is sent to a caller extension telephone set 1 via the extension interface circuit 3 as a transmission confirmation tone of the PB signal to the line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a confirmation for confirming whether or not a PB (push button) signal (selection signal) is normally transmitted to a line in a digital electronic exchange for a premises, a digital key telephone device or the like. The present invention relates to a method of transmitting a PB signal transmission confirmation sound used for transmitting a sound (PB back tone) to a calling side.

[0002]

2. Description of the Related Art Conventionally, a telephone (terminal) which is housed in an extension and whose selection signal system is not a PB signal system in a digital electronic exchange for a premises, a digital key telephone system, etc.
From a telephone to a line (station line or leased line) for which the selection signal system is the PB signal system, the selection signal from the telephone is analyzed inside the digital electronic exchange or the digital button telephone device and converted into the PB signal. Although it is sent to the line, a confirmation tone (PB) is sent so that the calling side can confirm whether or not this PB signal is normally sent to the line.
Back tone) is transmitted.

A conventional method of transmitting a PB signal transmission confirmation sound will be described with reference to the drawings. FIG. 2 is a schematic block diagram showing a digital electronic exchange for explaining a conventional method of transmitting a PB signal transmission confirmation sound, and FIG. 3 is a schematic block diagram showing a station line interface circuit of the digital electronic exchange.

As shown in FIG. 2, for example, when selection information is sent from an extension telephone 1 whose selection signal system is a dial pulse (DP) type, this selection information is connected to the extension telephone 1 to control the extension telephone 1. Is analyzed by the extension interface circuit 3 of the digital electronic exchange 2. The selection information analyzed by the extension interface circuit 3 is sent to the call processing control circuit 5 that controls the entire digital electronic exchange 2 through the control bus 4. Taking the case of making a call from the DP type extension telephone 1 to the office line as an example, when the call processing control circuit 5 determines that the selection information issued from the extension telephone 1 is the call to the office line, the call path is exchanged. , A call path a between the PB signal transmitter (digital sound source) 7 for controlling the time division switching circuit 6 for connection and transmitting the PB signal and the station line interface circuit 8 connected to the station line.
And a communication path b between the office line interface circuit 8 and the extension interface circuit 3 is formed on the receiving side of the extension telephone 1. Subsequently, the call processing control circuit 5, which recognizes the transmission to the central office line, instructs the PB signal transmitter 7 to transmit the selection information to be transmitted to the central office line. The PB signal, which is the selection signal transmitted from the PB signal transmitter 7, is transmitted to the office line interface circuit 8 through the time division exchange circuit 6.

P sent to the office line interface circuit 8
As shown in FIG. 3, the B signal is converted into an analog signal by a CODEC (encoder / decoder) 11, and is sent to a local line through a HYB unit (2-line to 4-line conversion unit) 12 and a station line interface unit 13. At the same time, the volume is reduced by the attenuator 14 and input to the selector 15. The selector 15 switches the reception to the extension telephone 1 between the reception from the station line and the attenuated PB signal according to the control signal from the station line interface circuit control unit 16. When the PB signal is transmitted to the station line, the call processing control circuit 5 issues a command to the station line interface circuit control unit 16 through the control bus 4 to switch the selector 15 to the PB signal side. And the attenuated PB
The signal is sent to the CODEC 11, is converted into a digital signal by the CODEC 11, and then is sent to the extension interface circuit 3 and the extension telephone 1 through the communication path b formed by the time division exchange circuit 6, and the caller receives the call. Becomes The caller is returned by the central line interface circuit 8 and attenuated PB
The signal can be heard as a confirmation sound of the PB signal emitted to the local line.

Reference numeral 9 in FIG. 2 is a digital type attenuation / amplifier (DPAD) that performs attenuation / amplification as a digital signal for optimizing the speech volume, and is viewed from the time division switching circuit 6 on the output side. And the attenuation / amplification value is controlled by the call processing control circuit 5. Further, the reason why the PB signal is attenuated as the confirmation sound is that the volume of the PB signal sent to the line (station line or dedicated line) is too large and gives a caller a discomfort.

[0007]

However, in the conventional method of transmitting the PB signal transmission confirmation sound, it is necessary to provide the attenuator 14 and the selector 15 in the station line interface circuit 8 and the dedicated line interface circuit 10. , The circuit scale becomes large. Further, every time the selection signal is transmitted to the line of the PB signal system, the call processing control circuit 5 needs to instruct the station line interface circuit 8 and the leased line interface circuit 10 to attenuate and loop back the PB signal. Therefore, as the capacity of the digital electronic exchange, digital key telephone system, etc. increases and the number of lines accommodated increases, the number of times the call processing control circuit 5 is instructed increases and congestion occurs, resulting in a decrease in processing capability. Further, when the PB signal is transmitted to a digital line such as ISDN, the digital line interface circuit handles the voice signal including the PB signal as a digital signal, so that it is difficult to construct an attenuator for the PB signal. Furthermore, when it is desired to change the attenuation value of the attenuated PB signal sound that is heard as the confirmation sound of the caller,
It is necessary to change the constants of the line interface circuits 8 and 10.

The present invention solves the above-mentioned conventional problems, does not require a PB signal attenuator or selector in the line interface circuit, and can reduce the size of the line interface circuit. , A confirmation sound of the PB signal can be easily generated, and it is not necessary to issue a PB signal attenuation or loopback instruction to the line interface circuit every time the PB signal is transmitted, thereby preventing congestion and reducing processing capability. It is an object of the present invention to provide a PB signal transmission confirmation sound transmission method that can be prevented and can easily adjust the volume of the confirmation sound.

[0009]

In order to achieve the above object, the present invention provides a line (station) in which a selection signal system is a PB signal system from an extension telephone which is not a PB (DTMF: push button) signal system. Line, a dedicated line), the PB signal sent from the PB signal transmitter to the above line is attenuated by a digital type attenuator / amplifier and sent as a confirmation sound to the originating extension telephone.

More specifically, when the PB signal transmitter transmits the PB signal to the line whose selection signal system is the PB signal system, the call processing control circuit controls the time division switching circuit to communicate with the PB signal transmitter. The line interface circuit and the PB signal transmitter form two communication paths with the extension interface circuit to which the transmitting extension telephone is connected, and at the same time, the call processing control circuit digitally connects the PB signal transmitter and the extension interface circuit. Shape attenuator / amplifier with a specified attenuation value,
The PB signal sent from the PB signal transmitter is sent to the line, and at the same time, is attenuated by the digital type attenuation / amplifier and sent to the transmitting extension telephone set via the extension interface circuit.

[0011]

Therefore, according to the present invention, since the PB signal generated from the PB signal transmitter and attenuated by the digital type attenuation / amplifier is used as the confirmation sound for the caller, the PB signal is attenuated in the line interface circuit. Does not need a selector or selector. In addition, P from the call processing control circuit to the line
PB to the line interface circuit each time a B signal is transmitted
No need to issue signal attenuation and loopback instructions. Furthermore,
The volume of the confirmation sound can be adjusted by rewriting the attenuation value of the digital type attenuation / amplifier from the call processing control circuit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram showing a digital electronic exchange for explaining a method of transmitting a PB signal transmission confirmation sound in an embodiment of the present invention.

As shown in FIG. 1, for example, when selection information is sent from an extension telephone 1 whose selection signal system is a dial pulse (DP) type, this selection information is connected to the extension telephone 1 to control the extension telephone 1. Is analyzed by the extension interface circuit 3 of the digital electronic exchange 2. The selection information analyzed by the extension interface circuit 3 is sent to the call processing control circuit 5 that controls the entire digital electronic exchange 2 through the control bus 4. Taking the case of making a call from the DP type extension telephone 1 to the office line as an example, when the call processing control circuit 5 determines that the selection information issued from the extension telephone 1 is the call to the office line, the call path is exchanged. , A call path a between the PB signal transmitter (digital sound source) 7 for controlling the time division switching circuit 6 for connection and transmitting the PB signal and the station line interface circuit 8 connected to the station line.
To the receiving side of the extension telephone 1,
A communication path c is formed between the B signal transmitter 7 and the extension interface circuit 3. At the same time, the call processing control circuit 5 causes the digital attenuation / amplifier (DPAD) 9 arranged on the communication path between the PB signal transmitter 7 and the extension interface circuit 3 connecting the calling extension telephone 1 to perform a predetermined attenuation. Indicate the value. Subsequently, the call processing control circuit 5, which recognizes that the transmission is to the office line, transmits the selection information to be sent to the office line to the PB.
Instruct the signal transmitter 7. As a result, the PB signal transmitter 7
The PB signal, which is the selection signal sent from the communication device, is transmitted through the call line a by the time division exchange circuit 6 to the station line interface circuit 8
, While digitally attenuated over the communication path c
The signal is sent to the amplifier 9, is given a predetermined attenuation by the digital type attenuation / amplifier 9, and is sent to the calling extension telephone set 1 through the extension interface circuit 3. In this way, the caller can hear the attenuated PB signal sound as the transmission confirmation sound of the PB signal that is the selection signal.

[0015]

As described above, according to the present invention, the PB signal generated from the PB signal transmitter and attenuated by the digital type attenuator / amplifier is used as the confirmation sound for the caller, and the PB signal is used in the line interface circuit. Since no attenuator or selector for the PB signal is required, the scale of the line interface circuit can be reduced, and moreover, the confirmation sound of PB signal transmission to the digital line can be easily generated. Also, every time a PB signal is transmitted from the call processing control circuit to the line, the PB signal is attenuated to the line interface circuit.
There is no need to issue a loopback instruction, congestion can be prevented, and a reduction in processing capacity can be prevented. Further, by rewriting the attenuation value of the digital attenuation / amplifier from the call processing control circuit, the volume of the attenuated PB signal which is the confirmation sound can be easily adjusted.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a digital electronic exchange for explaining a method of transmitting a PB signal transmission confirmation sound in an embodiment of the present invention.

FIG. 2 is a schematic block diagram showing a digital electronic exchange for explaining a conventional PB signal transmission confirmation sound transmission method.

FIG. 3 is a schematic block diagram showing a station line interface circuit of the digital electronic exchange.

[Explanation of symbols]

1 Extension telephone (dial pulse type telephone, dedicated telephone) 2 Digital electronic exchange 3 Extension interface circuit 4 Control bus 5 Call processing control circuit 6 Time division exchange circuit 7 PB signal transmitter 8 Station line interface circuit 9 Digital type attenuation / amplifier 10 Dedicated line interface circuit

Claims (1)

[Claims] 1. A PB transmitted from a PB signal transmitter to the above line when an extension telephone whose selection signal system is not the PB signal system transmits to a line whose selection signal system is the PB signal system.
A method of transmitting a confirmation sound for PB signal transmission, wherein a signal is attenuated by a digital type attenuation / amplifier and transmitted as the confirmation sound to the transmission extension telephone set.