JP3163457B2 - Multiplex button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex key telephone apparatus, and more particularly to a multiplex key telephone apparatus.

[0002]

2. Description of the Related Art As this kind of digital multiplexing apparatus, for example, an apparatus disclosed in Japanese Patent Application Laid-Open No. 64-84967 is known. This apparatus uses a 32 kbps ADPCM (Adaptive Differential Pulse Code Code M) for digitally transmitting voice and data in a mixed multiplex.
odulation) signal, and converts the original data signal into an octet bearer signal.
It is arranged in two time slots to which a kbps digital signal is allocated.

[0003]

SUMMARY OF THE INVENTION The above prior art is based on AD
The data converted to 32k-byte by PCM method is converted to 8bit
It is to be put on a 64 kbps communication channel as a unit,
Here, for example, ISDN (Integrated Services)
There is no idea to divide and multiplex the 64 kbps communication speed in Digital Network). However, in the current ISDN defined state of only the 64 kbps μ-law and A-law system, it is impossible to perform 32 kbps duplex communication in this state. The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-described problems in the conventional technology and to use a line having a communication speed of 64 kbps to perform, for example, 32 kbps duplex communication. It is an object of the present invention to provide a multiplexed key telephone apparatus which can perform the operation.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a main control unit for controlling a key telephone apparatus, a line interface controlled by the main control unit, and an extension interface for accommodating an extension telephone. The key telephone apparatus has a means for converting μ-law, A-law and ADPCM as digitization sampling methods for voice signals, and provides μ-law,
It is possible to set whether to use the A-law system or the ADPCM system, and when a common abbreviated number using the ADPCM system is transmitted, control is performed such that multiplex communication is performed by the ADPCM system. Achieved by a multiplexed button telephone device.

[0005]

In the multiplex key telephone apparatus according to the present invention, the ADP is set within the range specified in the CCITT notice.
The conversion data according to the CM system is multiplexed on an ISDN having a communication speed of 64 kbps.
Two calls can be simultaneously made using the SDN line.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a block diagram showing the configuration of the multiplex key telephone apparatus according to one embodiment of the present invention. In the figure, reference numeral 1 denotes a main control processor that controls the main control of the multiplex key telephone apparatus of the present embodiment, and 2 denotes an IS that accommodates an ISDN line.
DN interface, 3 is an extension interface for accommodating extension telephones 6a to 6n, 4 is a common abbreviated number and AD
This memory stores information indicating whether data is based on the PCM system or data based on the μ-law system. 5 is μ
1 shows a μ-law / ADPCM conversion unit for mutually converting signals of the -law system and the ADPCM system. Hereinafter, the operation of multiplex communication between the multiplex key telephone apparatuses configured as described above will be described. First, when registering a common abbreviated number, which is a general function of key telephone equipment,
Normal call (here, μ-law method) or ADP
Whether it is based on the CM method is set in advance. For example, if "#" is entered after the abbreviated number, the call is based on the ADPCM system, and if only the number is entered, a normal call is made.

When the above-mentioned common abbreviated number is transmitted, the main control processor 1 reads the telephone number from the memory 4, and when the ADPCM system is set by “#”, μ-law / ADPCM The conversion unit 5 is activated to convert the voice signal into a digital signal by the ADPCM method, and to transmit the call signal to the station with the transmission capability being unrestricted digital. Then, by using the user / user information element in the outgoing call signal, it notifies the receiving side that the communication uses the ADPCM method. Where the user
The user information element (UUI) is an information section that can be freely used by the user, and a code signal for an ADPCM call is determined in advance so that an ADPCM call can be identified. An example of this is shown in FIG. FIG. 3 (a)
Sets the information of channel 1 and channel 2 following the user / user information identifier (01111110) of the user / user information element, corresponding to the first half and the second half of 8 bits in the user user content length and the user specific protocol. It describes the situation. FIG. 3B shows an example of information actually set in channel 1 and channel 2.

Hereinafter, a specific operation example will be described with reference to FIGS.
The operation will be described with reference to the operation timing chart shown in FIG. First, an operation at the time of calling will be described with reference to FIG. Assuming that a common abbreviated number is transmitted from the extension telephone 6a on the transmitting side, the main control processor 1 reads the telephone number from the memory 4 as described above, and if the ADPCM system is set by "#", , The μ-law / ADPCM conversion unit 5 is activated to convert the voice signal into a digital signal by the ADPCM method, and to transmit the call signal to the station with the transmission capability being unrestricted digital. In this case, the code "0001" indicating that the channel 1 (ch1) is calling / in use is set in the calling signal. The receiving main unit receives this signal and calls the extension telephone. Here, assuming that the extension telephone 6d is hooked off, a line is connected between the transmitting side and the receiving side at this time. When a call is made to the same common abbreviated number from another transmission-side extension telephone 6b during a call using the above line, the main control processor 1 issues a new call to the station. Is not performed, using user / user information,
The receiving side is notified that another call using the ADPCM method is to be started.

More specifically, a code "0001" indicating the calling / in use of channel 2 (ch2) is set and transmitted. Upon receiving this message, the receiving side makes a new ring to notify the user that there is an incoming call, and also notifies the calling side that the call is being made using the same user / user information. When the user responds (here, off-hook of the extension telephone 6c), the user is notified of the response using the user information. As a result, two telephone calls using one line are realized. When the calling or called user terminates the call, the other party is notified of the disconnection using the user / user information. When the two calls are completed, a disconnect message is sent to the station to release the call channel. This situation is shown in FIG. In addition, if a call to the same common abbreviated number is made again after the end of one of the two calls and before the end of the other call,
The above operation will be repeated. According to the above-described embodiment, there is an effect that a multiplex call can be performed by effectively using the ISDN line.

The above embodiment is merely an example of the present invention, and it goes without saying that the present invention is not limited to this. For example, ISDN
Other dedicated lines and the like can also be applied to the present invention, and in the above embodiment, the case where ADPCM 32 kbps is used has been described. However, it is clear that four calls can be made simultaneously at 16 kbps. is there.

[0011]

As described in detail above, according to the present invention, a multiplexed key telephone apparatus capable of performing, for example, 32 kbps duplex communication using a line having a communication speed of 64 kbps is realized. It has a remarkable effect of being able to do so.

[0012]

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation at the time of calling a multiplex key telephone apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a multiplex key telephone apparatus according to the embodiment;

FIG. 3 is a diagram showing an example of an information set using a user / user information element (UUI).

FIG. 4 is a flowchart showing the operation of the multiplex key telephone apparatus according to the embodiment at the end of a call;

[Explanation of symbols]

1: Main control processor, 2: ISDN interface,
3: Extension interface, 4: Memory, 5: μ-law / A
DPCM converter, 6a to 6n: extension telephones.

Claims (3)

(57) [Claims] 1. A key telephone apparatus comprising: a main controller for controlling main control of a key telephone apparatus; a line interface controlled by the main controller; and an extension interface for accommodating an extension telephone. Μ-law and A-law as sampling methods and ADPC
In addition to the provision of means for mutual conversion with the M method, it is possible to set whether to use the μ-law, A-law method or the ADPCM method at the time of registering the common abbreviated number. If done, AD
A multiplex key telephone apparatus which controls to perform multiplex communication by the PCM system. 2. When a common abbreviated number is transmitted using the ADPCM system, the main control unit uses the user / user information element in the outgoing signal to transmit the ADP.
2. The multiplex key telephone apparatus according to claim 1, wherein the receiving side is notified of the communication using the CM system. 3. When a new communication request to the same communication destination is received during the multiplex communication, the main control unit uses the user / user information element to execute the same line using the ADPCM method. 2. The multiplex key telephone apparatus according to claim 1, wherein the receiving side is notified of the additional communication using the keypad.