JPH04363947A - Telephone set for packet line - Google Patents

Abstract

PURPOSE:To avoid talking imposition regardless of the silence state in the telephone set utilizing a packet line. CONSTITUTION:A voice signal from a handset 1 is amplified by an amplifier 3, an A/D converter section 5 converts the signal into a digital signal and gives it to a packet I/F section 9. The packet I/F section 9 applies packet processing to the digital voice signal as a packet signal, it is sent to an INS packet network 15 and the section 9 extracts the digital voice signal from the incoming packet signal and gives it to a D/A converter 7. The D/A converter 7 converts the extracted incoming digital voice signal into an analog signal and it is outputted to the handset 1 via the amplifier 3. A silence signal control section 17 stops the transmission of the packet signal from the packet I/F section 9 when a transmission voice signal in the packet I/F section 9 is a prescribed level or below.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to packet line telephones, and in particular to ISDN (Integrated Se...
Packet communication systems in the RVICES Digital Network (Integrated Service Digital Network) transmission system, such as the INS (Information
The present invention relates to telephones used in advanced information communication systems (Network System).

0002

BACKGROUND OF THE INVENTION Conventionally, in a general telephone system that transmits call voice signals as analog signals or digital signals, when a calling party makes a call by attaching the call code of the other party's telephone,
When a call arrives at the other party's telephone, the ring tone sounds, and when the other party picks up the handset, the line is secured and you can talk freely. Moreover, once a call line is secured, call charges continue to be charged until the user puts down the handset and disconnects the line.

0003

[Problems to be Solved by the Invention] However, in general, voice signals are not transmitted continuously from the time the call line is established until the end of the call, and there may be periods of silence during the conversation. The reality is that there are periods when audio is interrupted, and in the past, charges were charged even when audio was not being transmitted, and improvements were desired from the perspective of saving costs. The present inventor has proposed that in a packet communication system, for example, an INS, data is divided into blocks of a certain length, and each block has a packet (
The present invention was completed by focusing on the fact that the packet signal is only charged while the packet signal is being transmitted. The present invention was developed under such circumstances, and it transmits a packet signal only when there is actually voice on a call, and does not transmit a packet voice signal when there is actually no voice on a call, thereby suppressing unnecessary charges. The purpose is to provide telephones for packet lines.

0004

[Means for Solving the Problems] In order to solve such problems, the present invention provides an A
/D converter and D/A converting the incoming audio signal to analog
The digital audio signal from the converter and its A/D converter side is processed into output packets and sent to the packet bus, and the incoming packet signal from the bus is demodulated and packet processed to generate the incoming audio signal. The device includes a packet interface section that outputs to the D/A converter side, and a no-signal control section that stops sending out the packet signal when the audio signal to be sent falls below a predetermined level.

[0005]

[Operation] In the present invention equipped with such a means, the A/D converter digitally converts the output audio signal, and the packet interface unit processes the output packet based on the digital audio signal and sends the packet signal to the packet bus. However, the no-signal control unit detects the level state of the output audio signal at, for example, the packet interface unit, and controls the transmission of the packet signal to be stopped when the output audio signal falls below a predetermined level.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a packet line telephone according to the present invention. In FIG. 1, the handset 1
is a so-called handset and is connected to an amplifier 3, which amplifies the analog audio signal sent from the handset 1 and outputs it to the A/D converter 5.
This is a known system that amplifies the incoming analog audio signal from the A converter 7 and outputs it to the handset 1. The A/D converter 5 converts the analog audio signal sent from the amplifier 3 into a digital signal, and in some cases has a function of encoding it into predetermined transmission data. It is connected to the packet I/F section (hereinafter referred to as the packet I/F section) 9.

[0007] The packet interface section 9 has an A/
The digital audio signal from the D converter 5 is
A packet signal created in a predetermined packet format with a packet head and check code of a standard compatible with the packet network (packet line) 15 is sent to the bus (bus cable) 11. The bus 11 is connected to an INS packet network 15 via a line connection unit (DSU) 13. Note that the line connection device 13 is, for example, an interface that connects a plurality of buses 11 having different transmission rates and the INS packet network 15. Further, the packet interface section 9 checks for code transmission errors from the incoming packet signal from the bus 11, extracts a digital audio signal, and outputs it to the D/A converter 7 side.

Furthermore, a packet interface unit 9
has a function of converting a calling control signal into a calling message and transmitting it from the bus 11 in order to call the telephone of the other party, and decoding the calling message from the calling side and outputting it to an incoming call control section (not shown). The D/A converter 7 is for D/A converting the digital audio signal from the packet interface section 9 side into an analog signal, and has a function of performing predetermined decoding in some cases. Connected to 1. Note that there may be a circuit (not shown) between the handset 1, amplifier 3, A/D converter 5, D/A converter 7, and packet interface section 9.

Reference numeral 17 in FIG. 1 is a no-signal control unit connected to the packet interface unit 9, and the packet interface unit 9 detects the signal level of the digital audio signal sent from the A/D converter 5 side. However, when the level falls below a predetermined level, it is determined that there is no voice and the sending of the packet signal from the packet interface section 9 is stopped.

Next, the operation of the above-mentioned packet line telephone according to the present invention will be briefly explained. As shown in FIG. 2, from the packet interface section (not shown in FIG. 2) of the telephone A of the present invention to the bus 11, the circuit connection device 13, and the I/O
When a call is started by sending a calling message to the other party's telephone B via the NS packet network 15, the handset 1 shown in FIG.
The telephone voice from the amplifier 3 is amplified, and the A/D converter 5
The signal is converted into a digital signal and output to the packet interface section 9. Packet interface section 9
creates a packet signal of a predetermined packet format from the digital audio signal and sends it to the INS packet network 15 via the bus 11 and circuit connection device 13.

At this time, the no-signal control section 17 constantly monitors the audio signal level in the packet interface section 9, and when the audio signal level becomes below a predetermined level, the packet signal sending operation in the packet interface section 9 is started. is stopped, and when the audio signal level exceeds a predetermined level, the transmission operation is restarted. When a packet signal arrives from the other party's telephone B in FIG. 2, the packet interface section 9 in FIG. , the D/A converter 7 converts it into an analog signal and outputs it to the handset 1 via the amplifier 3.

As described above, the packet line telephone of the present invention does not transmit a packet signal for a weak voice signal below a predetermined level that does not result in no voice or a conversation. By appropriately selecting the detection level, it is possible to avoid billing when there is no voice or when voice does not actually constitute a call, and it is possible to reduce unnecessary billing and reduce costs. The above-mentioned no-signal control section 17
The configuration is not limited to detecting the output audio signal level in the packet interface unit 9, but also includes the amplifier 3 and the A/D.
It can be configured to detect the output audio signal level in the converter 5 and control the packet signal output from the packet interface unit 9. Note that the packet line telephones A, A1, and A2 of the present invention are connected to the INS packet network 1.
5, and those multiple phones A, A1, A
2. It is also possible to communicate with each other using the present invention.

[0013]

[Effects of the Invention] As explained above, the present invention provides a packet line telephone for making calls via a packet line.
Because the system is configured to stop sending packet audio signals when the audio signal to be sent falls below a predetermined level, line usage fees are charged only when there is actual call audio, and are not charged when there is virtually no call audio. Therefore, unnecessary charges can be suppressed and expenses can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a packet line telephone according to the present invention.

FIG. 2 is a diagram schematically showing an INS including the packet line telephone of FIG. 1;

[Explanation of symbols]

1 Handset/receiver 3 Amplifier 5 A/D converter 7 D/A converter 9 Packet interface section (packet I/
F section) 11 Bus 13 Line connection unit (DSU) 15 Packet line (INS packet network) 17 No-signal control section

Claims (1)

[Claims] 1. A packet line telephone for making calls via a packet line, comprising: an A/D converter for digitally converting an outgoing voice signal; a D/A converter for analog converting an incoming voice signal; The digital audio signal from the converter side is subjected to output packet processing and the packet signal is sent to the packet bus, and the incoming packet signal from the bus is subjected to demodulation packet processing to send the incoming audio signal to the D/A converter side. What is claimed is: 1. A packet line telephone set comprising: a packet interface section for outputting to a packet line; and a no-signal control section for stopping transmission of the packet signal when the voice signal to be transmitted falls below a predetermined level.