JPS6339242A - Digital transfer telephone set - Google Patents

Abstract

PURPOSE:To attain a transfer action through the use of one digital subscriber line by connecting the transmissions and reception signals of two information channels with each other. CONSTITUTION:The address of a transfer destination is set through a ten-key, and a transfer action is instructed by depressing a transfer switch 24a. When an incoming call comes in a telephone set A from a telephone set B through the digital subscriber line 16, a calling action is made by using the information channel B2 or B1. Next, the telephone set A inserts a previsously recorded transfer message into the information channel B2 and transmits to a telephone set C. Upon the completion of the transmission of the transfer message, the telephone set A transmits an off-hook, that is, a response signal, to the telephone set B. Simultaneously a signal route switching part 26 connects the information channels B1 and B2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a digital transfer telephone connected to a digital subscriber line having two information channels and capable of transferring data using the two information channels. It is something.

[Prior Art] FIG. 6 is a block diagram showing a conventional transfer telephone set disclosed in, for example, Japanese Patent Application Laid-open No. 60-236552. In the figure, (1) detects a call on the first line. (2) is a control circuit that performs transfer control; (3) is a second line off-hook relay that loops on the second line on the transfer destination side (calling side line); (4) is a selection signal and (5) is a telephone line interface transformer that outputs the selection signal and announcement voice, etc. to the second line; (6) is a transfer destination off-hook detection circuit that detects a response from the transfer destination; 7) is the first line off-hook relay that loops on the first line (@calling line), (8)
is a line connection relay that connects the first line and second line, (
9) is the first line connection terminal, (10) is the second line connection terminal, (11) is the recording switch that commands the recording of the announcement voice, (12) is the microphone, (13) is the amplifier, (
14) is a semiconductor recording/reproducing device using a semiconductor audio reproducing element.

Next, the transfer operation of the transfer telephone configured as described above will be explained. When there is an incoming call at the first line connection terminal (9>), the ringing signal detection circuit (1) detects the hung call and gives a signal to the control circuit (2).

This control circuit (2) generates a multi-frequency dial signal based on a preset transfer destination address.

This dial signal is applied to a telephone line interface transformer (5) via a current amplifier (4). Furthermore, since the control circuit (2) also drives the second line off-hook relay (3), the dial signal is sent to the second line.

When the destination telephone goes off-hook and answers, the DC potential of the second line is reversed. This polarity change is detected by the transfer destination off-footer detection circuit (6), and the control circuit (2) receiving this detection signal drives the line connection relay (8). As a result, the first line and the second line are connected to relay contacts (8a>, (8a)
A connection is established through the closed circuit shown in b), and a conversation between the caller and the transfer destination becomes possible.

Further, the transfer notification message to the transfer destination is recorded in advance on the semiconductor recording/playback device (14), and when the off-hook of the transfer destination is detected, the control circuit (2) drives the semiconductor recording/playback device (14). , the message is sent to the forwarding destination via the telephone line interface 1 to the lance (5).

[Problems to be solved by the invention] Since the conventional transfer telephone is configured as described above,
To enable transfer operations, two lines, a called line and a calling side line, are always required. In addition, network control circuits for two lines are required, resulting in a complicated circuit configuration.

This invention was made to solve the above-mentioned problems.In a digital telephone connected to a digital network having two information channels and one control signal channel through one JJO entry line, one An object of the present invention is to provide a digital transfer telephone that allocates one information channel to the called side and the other information channel to the calling side, and performs a transfer operation using one subscriber line.

[Means for Solving the Problems] The digital transfer telephone according to the present invention includes a multiplexing/demultiplexing unit that multiplexes and demultiplexes each information channel, a processing unit that controls network connection of each information channel, and a A signal path switching section is provided to connect mutual information channels, and a processing section is operated to perform a transfer operation in response to a transfer command from a transfer switch.

[Operation] When a call arrives on one of the information channels, the digital transfer telephone according to the present invention determines whether the other information channel can be used, and if it is available, dials the transfer destination address, and In response to a response from the forwarding destination, a forwarding message is sent and the two information channels are connected to enable a conversation between the caller and the forwarding destination.

[Example] The present invention will be explained below with reference to the drawings. FIG. 1 is a block diagram of a digital transfer telephone showing an embodiment of the present invention, FIG. 2 is a transmission frame diagram of a digital subscriber line, and FIG. 3 is a wiring diagram of a signal path switching section.

In FIG. 1, (16) is a digital subscriber line that bidirectionally transmits digitally encoded signals, (17) is a line interface section consisting of a driver/receiver that terminates the digital subscriber line, and (18) is a The received signal from the line interface section (17) is decomposed into frames and divided into information channels (B1), (B2> and control signal channel (D).
a frame multiplexing/demultiplexing unit that performs separation and reverse assembly operations;
(19) is a codec that performs analog-to-digital conversion of audio signals, (20) is an amplifier for sending and receiving calls, (21) is a receiver, (22) is a transmitter, and (23) is a control signal channel (D). A processing section (24) is composed of a microcomputer that performs processing, display processing, and key import processing, and a numeric keypad transfer switch (24a) and a recording switch (24b).
, a keyboard section consisting of a playback switch (24G), etc., (25) a display section consisting of a transfer indicator lamp (25a), a recording indicator lamp (25b), etc., and (26) an information channel from the multiplexing/demultiplexing section (18). (81), (B2) on the codec (19) side, data terminal interface (2)
7) Connection and information channels switched to the side (81), (82>
(28) is an A/D converter that performs analog-to-digital conversion for recording and playing back voice messages; (29) is an A/D converter (28) that converts the voice message into a digital signal; A part of memory that stores audio codes.

Figure 2 shows the transmission frame, and the information channel (B
1), (B2> are both 64 kbps, control signal chi V
The channel (D) constitutes a multiplexed frame at a rate of 15 kbps.

FIG. 3 shows a signal path switching unit (26), which includes a first switching switch (26a>) that switches the reception path to the information channel (B1), and a first switch (26a>) that switches the reception path to the information channel (B1).
1) A second switch (26b) for switching the transmission route
, a third switch (26G) that switches the reception route of the information channel (B2), and a fourth switch (26d) that switches the transmission route of the information channel (B2), and these switches (26a) to ( 26d) is switched by the output of the processing unit (23>).

The operation of the above configuration will be explained below. First, we will describe the recording of a message to be sent to a forwarding destination. By pressing the recording switch (24b) on the keyboard section (24), the processing section (23) turns on the recording lamp (2) on the display section (25).
5b) and controls the A/D converter (28) to transfer the audio signal from the transmitter (22) to part of the memory (2).
9).

In the storage section 7jfIiJ, when the playback switch (24c) is pressed, the processing section (28) controls the A/D conversion section (28), reads out the stored data from the memory part (29), and sends/transmits the data.
It is monitored by a receiver (21) via a receiver amplifier (20).

Next, the transfer call operation will be explained. The 7 addresses to be transferred are set in advance using a numeric keypad or the like, and the transfer operation command is issued by pressing the transfer switch (24a). Processing part 23
) lights up the transfer lamp (25-a) indicating the transfer operation.

Next, the operation from incoming call to transfer will be explained based on the transfer sequence diagram in FIG. 4 and the flowchart 1 to FIG. 5 showing the transfer operation.

An incoming call is received from the telephone (B) to the telephone (A) via the digital subscriber line (16). This incoming call signal is inserted into the control signal channel (D), and the processing section (23) decodes and makes a decision (step 5-1). At this time, it is also determined whether the used information channel is (B1) or (B2) (step 5-2).

If the information channel (B1) is in use, it is determined whether the other information channel (B2) is in use, or in the case of this telephone, in use as a data terminal (step 5-3). Further, in the case of an incoming call on the information channel (B2), it is determined whether the information channel (B1) is in use (step 5-4). Based on these judgments, if the other information channel is not in use, a calling operation is performed using the information channel (B2) or the information channel (Bl) (step 5-5.5-6).

The dialing at this time is performed using a preset forwarding address, and in this embodiment, the call is made to the telephone (C). When phone 1 (G:) goes off-hook, phone 1 (A
) receives an incoming response and detects the other party's response (step 5-7).

Next, in the telephone (A>), the memory part (29) and the A/D converter (28) are driven, and the prerecorded transfer message is sent via the codec (19) and the signal path switching unit (26). It is inserted into the information channel (B2) and sent to the telephone (C) (steps 5-8).

At this time, the signal path switching section (26) switches to the third switching switch (
26c), the fourth changeover switch (26d) is driven,
Each contact is a connection between an eye and a mouth.

When the transmission of the forwarded message is completed, the telephone (A) sends an off-hook, that is, a response signal, to the telephone (B) (step 5-9). At the same time, the signal path switching section (26)
connects the information channel (B1) and the information channel (i3) (step 5-10).

The first to fourth changeover switches (26a) at this time.

(26b), (26c), and (26d) are the connections of A and 2, respectively. This establishes a connection between the information channel (B1) receiving side and (B2) transmitting side, and a connection between the (B1) receiving side and (B2) receiving side, making it possible to transfer the information channel.

Furthermore, when a call is made to the forwarding destination and the other party does not respond (step 5-11), a message such as an absence is sent to the caller. In general, a similar absence message is sent even when the other information channel is being used for another purpose.

By performing the following operations, telephone transfer can be performed using two information channels.

[Effects of the Invention] As described above, according to the present invention, since the transmission and reception signals of two information channels are configured to be connected to each other,
The transfer operation can be performed using one digital subscriber line, and the circuits required for the transfer operation can also be used for each information channel, which has the effect of simplifying the transfer operation.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing a digital transfer telephone according to an embodiment of the present invention, Fig. 2 is a transmission frame diagram, Fig. 3 is a wiring diagram of a signal path switching section, Fig. 4 is a transfer sequence diagram, and Fig. 5 6 is a flowchart of the transfer operation, and FIG. 6 is a configuration diagram of the transfer telephone set of the United States. 6 in the figure, (16) is a digital subscriber line, (17)
is the line interface section, (18) is the multiplexing/demultiplexing section, (
19) is a codec, (21) is a receiver, (22) is a transmitter, (23) is a processing unit, (24) is a keyboard, (2
6) is a signal path switching section. In the figures, the same reference numerals indicate the same or equivalent parts. Agent: Masuo Oiwa, patent attorney (and 2 others) Figure 1 Figure 2 w113! 6d Figure 4 Figure 5

Claims (1)

[Claims] (1) A line interface unit that interfaces with a digital network that multiplexes two information channels and one control signal channel, and separates each information channel and control signal channel from the multiplexed signal, and In a digital telephone having a multiplexing/demultiplexing unit that performs multiplex conversion, a codec that converts audio from analog to digital, and a transmitter/receiver, switching each information channel input/output signal of the multiplexing/demultiplexing unit to the codec, Alternatively, a signal path switching section that connects the information channel input/output signals to each other and switches them so that information can be transferred, a keyboard section that has a transfer switch that specifies the transfer operation, and a keyboard section that captures the state of this transfer switch and transfers it to the originating side. 1. A digital transfer telephone set, comprising: a processing unit that controls connection with a destination and controls the signal path switching unit.