JPH0530237A - Digital telephone system - Google Patents

Abstract

PURPOSE:To minimize a large sized power supply device and the cost increase of the system even when the number of telephone sets to be connected and the total length of transmission lines are increased. CONSTITUTION:An assembled equipment 30 is provided with a sound source 306 for various signal tones, a speech network 309 implementing on/off control of transmission of a signal tone from the sound source to a telephone set and implementing level control of a transmission signal, a control circuit 310 controlling the transmission reception of the voice signal from a telephone set 10 and a signal from the speech network to be executed to the telephone set 10 of an object subjected to loudspeaking talking mode and loudspeaking to the telephone set to the transmission reception of the voice signal of the telephone set 10 set to the loudspeaking mode, and each telephone set 10 is provided with a speaker 103 and a microphone 102 for loudspeaking and a control circuit 110 implementing the control of the speaker 103 and the microphone 102 and the input output of the voice signal and the signal tone output control in response to the received controled signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone system such as a PBX or a button telephone device which digitizes and transmits a voice signal between a main unit and a telephone.

[0002]

2. Description of the Related Art Private branch exchanges (PBXs), button telephones, and the like have been put into practical use in which voice signals are digitized and transmitted between them and a telephone connected to them. As described above, the method of digitizing and transmitting the voice signal between the telephone and the main device such as the PBX or the key telephone device to which the telephone is connected has a voice level higher than that of the analog system depending on the length of the transmission line. There is no problem that it changes or the frequency characteristic of the audio signal changes due to the characteristic impedance of the transmission line,
This is a method that has become very popular in recent years.

FIG. 5 is a block diagram showing a conventional example of such a digital telephone system. A conventional system will be described with reference to the drawings. The telephone system of the telephone 1 is divided into two systems, an analog circuit and a digital circuit. The analog circuit is a handset 101, a microphone 102, a speaker 103, and these handset 101 and microphone 102. , Speaker 103 and A /
It is composed of a switch circuit 105 for switching the connection with the D / D / A converter 104.

As a digital circuit, a ringing tone,
A sound source 106 that produces various sounds such as a DTMF sound and a key confirmation sound that is a sound for confirming the operation at the time of key operation, and a loudspeaker circuit that performs transmission and reception switching control for a loud voice call by the microphone 102 and the speaker 103. 107, and a multiplexing circuit 108 for digitally multiplexing or separating a voice signal (B channel) exchanged between the main device 2 and the telephone 1 and a control signal (D channel) between the main device 2 and the telephone 1. Or a speech network 109 for performing input / output on / off control of voice signals and various sound source signals and level control with an A / D / D / A converter 104 for mutually exchanging analog signals / digital signals. ing. Then, these communication systems are controlled by a control circuit 110 configured by using a microprocessor or the like, and the control circuit 110 is placed under the control of the main unit 2 via the multiplexing circuit 108.

Further, the control circuit 110 is connected with a key input circuit 111 for inputting a key operation and a display 112 including an LED (light emitting diode) for displaying the state of the telephone 1 and an LCD (liquid crystal display). Has been done. The power supply 113 for supplying power to the telephone 1 receives power from the transmission / feed line 3 which is a connection line between the main device 2 and the telephone 1.

The transmission / feed line 3 transmits a digitized voice signal and a control signal between the main unit telephone and the transmission / feed line 3 is supplied with a DC voltage from the main unit 2. Using this, the telephone 1 is supplied with power.

The telephone 1 is connected to the transmission / feed line 3 via a transformer 114. This transformer 114
Is used for signal and power distribution, and transformer 11
The voice signal and the control signal isolated by 4 are transmitted to the multiplexing circuit 108, and the power is transmitted to the power supply 113.

The main unit 2 has a multiplexing circuit 20 similar to that described above.
8, a transformer 214 for isolating signal components and power components, a trunk circuit 201 for connecting to an external line (local line), a control circuit 202 for controlling the movement of the entire system, and power for the entire system. Power supply 203
It consists of Here, the trunk circuit 201 has a different circuit configuration depending on whether the external line is an analog line or a digital line, but in the present invention, since this difference is not relevant, no particular distinction is made.

The above-mentioned other constituent elements of the main unit 2 are all digital circuits.

The multiplexing circuit 208 and the trunk circuit 201 can time-divisionally send the digitized voice signal to the PCM highway 204, and take out from the PCM highway 204 to alternately transmit the voice signals. The multiplexing circuit 208 and the trunk circuit 201 are placed under the control of the control circuit 202 by the control bus 205. The power source 203 is connected to the power supply in the main device 2 and the transmission / power supply line 3
Power is supplied to each telephone 1 via the.

The operation of the telephone system having such a configuration will be described.
A case where a telephone call is made between the extensions using the handset 101 will be described. When the telephone goes off-hook in the handset call mode, the switch circuit 105 switches the transmitter / receiver of the handset 101 to A / D / D / A.
Connect to the exchanger 104. Next, when a dial input is performed by the operator's key operation, the dial number of the other party is input from the key input circuit 111 to the control circuit 110 by this key input.
The control circuit 110, which receives the dial information, receives the dial information, sends the dial information to the multiplexing circuit 108, and multiplexes the dial information. The transformer 114, the transmission / feed line 3, and the transformer 21.
4 to the multiplexing circuit 208 of the main device 2. Then, the multiplexing circuit 208 separates the dial information,
The separated dial information is transmitted to the control circuit 202 through the control bus 205.

In the control circuit 202, a control signal is transmitted to a control circuit of the other party's telephone (not shown) by a route reverse to this, a ringing tone is emitted from the sound source, and a call to the handset is made off-hook by taking the handset of the other operator. The road is opened. Handset 1 for transmitted voice
01, switch circuit 105, A / D / D / A converter 10
4, speech network 109, multiplexing circuit 108,
It is transmitted to the PCM highway 204 through the transformer 114, the transmission / feed line 3, the transformer 214, and the multiplexing circuit 208. Then, in the opposite route, it is transmitted to the handset of the extension partner's telephone as the received voice.

The handset call is carried out as described above, but the voice signal is transmitted by the speech network 1 during the voice call.
09 is once transmitted to the loudspeaker circuit 107, and the transmission / reception sound is switched and controlled here so that the transmission and reception can be switched alternately. Except for that point, the same is true for voice calls as for handset calls. Further, the extension-external line call is also the same as the extension-line call except that the other party is connected via the trunk circuit 201.

By the way, in this conventional system,
Although the telephone 1 digitizes and processes the voice signal, the circuit scale must be increased in order to correspond to the digitization processing. For example, in the case of an analog circuit, a combination of an amplifier circuit and a switch circuit will suffice, but the digitization requires arithmetic processing of the audio signal, and an arithmetic unit (ALU) and a ROM, RAM, etc. in which a program for this control is written are required. Will be needed. Further, since mutual conversion between analog and digital is required, an A / D / D / A converter for that is also required.

Further, the speech network 109, the loudspeaker circuit 107, the sound source 106, etc. are actually constituted by a digital signal processor (hereinafter abbreviated as DSP). Therefore, the power consumption is significantly increased as compared with the analog telephone. Since the telephone set receives power from the main unit, the capacity required as the power source for the main unit must be increased according to the number of connected telephone sets, which is significantly higher than when connecting an analog telephone set. The size of the main device causes the main device to be large in size and also leads to an increase in cost.

Further, since the capacity of the power supply of the main device is determined at the manufacturing stage, when the capacity of the telephone system is increased to increase the number of extensions, the problem of power supply limitation arises. That is, assuming that the power supply voltage Vs and the line resistance r of the transmission line, the electric power W that can be supplied to the telephone 1 is given by W = (Vs) ² / 4r (1). And the same power as W is the resistance of the transmission line
Wasted by r. Therefore, if the system becomes larger, the total length of the transmission line will inevitably become longer, so the system becomes larger and the resistance r increases as the transmission line extends,
This leads to a decrease in the power that can be supplied to the telephone, that is, an increase in loss. To prevent this, it is conceivable to increase the power supply voltage Vs, thicken the transmission line, or locally supply power to the telephone, but either method is inevitable to increase the size and cost of the device. There wasn't.

[0017]

As described above, in the above-mentioned conventional digital telephone system, the voice signal is digitized and processed in the telephone, and a large-scale circuit is required for this digitization processing. In addition, the power consumption was higher than that of an analog telephone, which requires a combination of an amplifier circuit and a switch circuit. Moreover, in the past, the system configuration was such that a telephone was directly connected to the main unit to supply power, so when expanding the system, it is necessary to compensate for the power equivalent to the additional telephone or the loss due to the lengthening of the transmission line. There is a problem in that it is necessary to increase the power supply capacity of the main device, and it is unavoidable that the main device becomes larger and costs increase.
The present invention eliminates this problem, and in a telephone system in which a main unit and a telephone are digitized, even if the number of telephones to be connected and the total length of transmission lines used for the connection increase, the power supply device becomes large and the system becomes large. It is an object of the present invention to provide a digital telephone system capable of minimizing the cost increase of the above.

[0018]

A digital telephone system of the present invention comprises a main device for performing a switching operation, a plurality of collecting devices connected to the main device, and a plurality of telephones connected to the collecting device. The main device and each of the aggregating devices are digitally multiplexed for a plurality of communication channels, and control signals are commonly used for a plurality of channels so that voice signals and control signals are exchanged by multiplexing by digital transmission. In addition, the call control is performed by exchanging voice signals by analog transmission and control signals by digital transmission between the collecting device and each of the telephones, and the power supply of the collecting device is supplied from the power supply of the main device through a communication line. Or the power is supplied independently, and the power of the telephone is supplied from the main unit through the collecting unit through a communication line. In the telephone system, the aggregating device includes a sound source for generating signals of various signal sounds, and a speech network means for controlling ON / OFF of sending signal sounds from the sound source to the telephone and controlling the level of the signal. Controlling the sending and receiving of signals from the speech network means and the voice signals from the telephone set to the telephone set to be given and received, and the sending and receiving of the voice signal to and from the telephone set in the voice call mode. And a control means for controlling to give a control signal for controlling a voice call to the telephone, and each of the telephones,
A voice signal loudspeaker output means and a voice signal loudspeaker input means, and controls the voice signal loudspeaker output means and the voice signal loudspeaker input means according to the received control signal, and the voice signal loudspeaker output means and the voice signal loudspeaker input means. And a telephone control means for controlling voice signal input / output and signal sound output.

Further, the control means of the collecting apparatus is provided with a function of controlling to send a confirmation sound from the sound source from the sound source to the operation telephone, and the telephone control means on the telephone side has its own telephone. It is configured by adding a function of controlling the control signal associated with the operation of 1 to be sent to the main device via the collective device.

[0020]

In such a structure, the gathering device has a sound source for generating various signal tones required on the telephone side, and a speech network for performing on / off control and signal level control of sending of the signal tones from this sound source. Means for generating a ringing tone, a DTMF sound, a key operation sound for the telephone from the sound source, and through the speech network means under the control means on the side of the collecting device to multiplex with the telephone to be exchanged. Send it out and send it to the other party's phone. On the side of the telephone which receives this, a signal sound obtained by separating the multiplexed signal is sent to the communication system to notify the user of the telephone by sound.

When the other party's telephone responds, the response signal is sent to the collecting apparatus side via the main apparatus, so that the control means of the collecting apparatus forms a communication path to enable the exchange of voice signals. Also, when making a voice call, the control means on the side of the aggregator knows this and performs control for the voice call by the control signal from the telephone set to the voice call. On the side of the telephone set in the mode, switching control of the voice signal loudspeaker output means and the voice signal loudspeaker input means and the like are performed so that the telephone call from the loudspeaker call element side becomes possible.

As described above, in the present system, the sound source for generating various signal sound signals required for the telephone side, which is conventionally provided in each telephone side, and the control of sending out the signal sound from this sound source and controlling the signal level are provided. Move the speech network means to the aggregating device and omit them from the telephone side, control the generation of signal sound and voice level, and further perform the necessary control at the time of a voice call collectively on the aggregating device side As a result, the number of components on the telephone side is correspondingly reduced and the load is also reduced. Conventionally, the power supply that must be supplied to the telephone side and the aggregation device side has a smaller capacity than before and the communication line The loss is smaller even if the distance becomes longer. Therefore, the power supply capacity of the main unit can be suppressed, and even if the system becomes large, the power supply capacity of the main unit can be significantly reduced compared to the conventional one, and even if a telephone terminal is added later, the degree of freedom is greater than the conventional one. Become.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing an embodiment of a digital telephone system according to the present invention.
Incidentally, in the following, since there are a plurality of telephones, the suffixes A, B, ... Are added to the reference numerals in the figure in order to distinguish them, but the suffixes are omitted in the description unless necessary.

In FIG. 1, reference numeral 10 is a telephone, and the telephone communication system of the telephone 10 is an analog circuit and a digital circuit.
It is divided into lines. The analog circuit includes a handset 101, a microphone 102, a speaker 103, and these handset 101 and microphone 10.
2. A switch circuit 10 for switching the connection between the speaker 103 and the hybrid circuit 115 for performing 4-wire / 2-wire conversion.
5. The transformer 116 for transmitting a voice signal to and from the collecting device 30.

A sound source for producing various sounds such as a ringing sound, a DTMF sound, and a key confirmation sound for confirming the operation of the key operator, which are conventionally provided on the telephone side as a digital circuit, the microphone 102, the speaker 103. A loudspeaker circuit for controlling voice transmission and reception switching for
A / D for mutual exchange of analog and digital signals
・ The D / A converter and the speech network that performs input / output on / off control of audio signals and various sound source signals and level control between the A / D and D / A converter are omitted from the telephone 10. There is. The communication system is controlled by a control circuit 110 that is configured by using a microprocessor or the like, and the control circuit 110 is placed under the control of the collecting device 30 via a pulse transformer 117.

Further, the control circuit 110 is connected with a key input circuit 111 for inputting a key operation and a display 112 including an LED (light emitting diode) or LCD (liquid crystal display) for displaying the state of the telephone 10. Has been done. The power supply 113 that supplies the power of the telephone 10 is a transmission / feed line 31 that is a connection line between the collecting device 30 and the telephone 10.
Is receiving power from

The transmission / feed line 31 is a voice signal and a collecting device.
Control signals are transmitted between telephones, and this transmission /
A DC voltage is supplied from the collecting device 30 to the power supply line 31, and the power is supplied to the telephone 10 by utilizing the DC voltage. The telephone 10 is connected to the transmission / power supply line 31 via transformers 116 and 117. The transformers 116 and 117 are used for distribution of signals and electric power. The audio signal and the control signal isolated by the transformers 116 and 117 are transmitted to the hybrid circuit 115 and the control circuit 110, respectively, and the electric power is supplied to the power source 11.
Passed to 3.

The main unit 20 is a multiplexing circuit 20 similar to that described above.
8, a transformer 214 for isolating signal components and power components, a trunk circuit 201 for connecting to an external line (local line), a control circuit 202 for controlling the movement of the entire system, and power for the entire system. Power supply 203
Is equipped with. The trunk circuit 201 has a different circuit configuration depending on whether the external line is an analog line or a digital line, but in the present invention, since this difference is not relevant, no particular distinction is made.
Also, all other constituent elements of the main device 20 other than those described above are digital circuits.

The multiplexing circuit 208 and the trunk circuit 201 can time-divisionally send the digitized voice signal to the PCM highway 204, and take out from the PCM highway 204 to alternately transmit the voice signals. The multiplexing circuit 208 and the trunk circuit 201 are the control bus 205.
Is under the control of the control circuit 202.

The power source 203 supplies electric power in the main unit 20 as well as electric power to the collective unit 30 through the transmission / feed line 3. The gathering device 30 is placed between the main device 20 and the telephone 10 and pulls in a plurality of extensions.

In FIG. 1, the analog circuit of the communication system comprises a transformer 316 for isolating a voice signal component and a power component, and a hybrid circuit 315 for performing 4-line / 2-line conversion. As a digital circuit, an A / D / D / A converter 304 that performs mutual conversion between an analog signal and a digital signal, and input / output of voice signals and various sound source signals between the A / D / D / A converter 304 is turned on. A speech network 309 that performs on / off control, level control, etc., a loudspeaker circuit 307 that controls transmission / reception switching for a loud voice call, and a sound source 306 that produces various sounds such as ringing tone, DTMF sound, and key confirmation sound. is there.
These communication systems are controlled by a control circuit 310 configured by using a microprocessor or the like, and the control circuit 310
Are under the control of the main unit 20 via a multiplexing circuit 308. The power supply 313 that supplies power to the collective device 30 receives power from the transmission / power supply 3 that is a connection line between the main device 20 and the collective device 30.

The power from the transmission / feed line 3 is transmitted to the transmission / feed line 31 to the telephone 10 and serves as a power source for the telephone 10. The transmission / feed line 3 transmits a digital audio signal multiplexed with a plurality of channels and a control signal common to each channel between the main unit and the collecting unit, and the transmission / feed line 3 is connected to the main unit 20. Further, a direct current voltage is supplied, and this is used to supply power to the collecting device 30. The collecting device 30 is connected to the transmission / feed line 3 via the transformer 314. The transformer 314 is used for distribution of a signal and electric power. The audio signal and the control signal isolated by the transformer 314 are transmitted to the multiplexing circuit 308, and the electric power is transmitted to the power supply 313.

The power supply line 3 is composed of two or more pairs of lines, one pair for transmitting the downstream voice signal and the control signal from the main unit 20, and the other pair for transmitting the upstream voice signal and the control signal to the main unit 20. Is transmitted. A direct current voltage is supplied between the two pairs of lines to supply power to the collecting device 30. If necessary, other pairs of wires are used to make up for the lack of power supply capacity.

The transmission / feed line 31 consists of two pairs of lines, one
The pair transmits an analog voice signal between the collecting device and the telephone,
Another pair transmits digital control signals between the collecting device and the telephone. A direct current voltage is supplied between the two pairs of wires to supply power to the telephone 10. The transformer 316 and the pulse transformer 317 are used for distribution of an audio signal, a control signal and electric power, respectively. The audio signal is sent to the hybrid circuit 315 and the control signal is sent to the control circuit 3.
Passed to 10.

The collecting device 30 in this system is a device in which the A / D / D / A converter, the sound source, the speech network, and the loudspeaker circuit, which are conventionally provided on the telephone side, are relocated, and the telephone 10 side installs them. It is omitted.
That is, in FIG.
Reference numeral 4 is an A / D / D / A converter, 306 is a sound source, 307 is a loudspeaker circuit, and 309 is a speech network. Sound source 306, loudspeaker circuit 307, speech network 309
The function of is the same as that described in the conventional example, but multiple lines of audio signals are integrated and integrated, and input and output can be performed by serial transmission multiplexed with each other. Control is performed via the control bus 305 to the control circuit 3
The configuration is performed by 10.

The operation of the telephone system having such a configuration will be described by taking a handset call between extension lines as an example. For example, the key input of the operation sound on the telephone 10A is performed by the key input circuit 111A as the dial number by the control circuit 10A.
Read by the pulse transformer 117A, transmission / feed line 31A, pulse transformer 317A, control circuit 310, control bus 305, multiplexing circuit 308, transformer 314, transmission / feed line 3, transformer 214A, multiplexing circuit 208.
A, the control circuit 2 as a control signal through the control bus 205
02.

The control circuit 202 analyzes the control signal and transmits the control signal to the control circuit 110B of the other party's telephone 10B through the collecting device 30 by the route opposite to the above, and the control circuit 110B displays the incoming call on the display 112B. The LED is turned on and characters are displayed on the LCD. And
In the collecting device 30, the ringing sound from the sound source 306 is sent to the transmission / feed line 31B through the speech network 309, the A / D / D / A converter 304B, the hybrid circuit 315B, and the transformer 316B.

The telephone set 10B receives this through the transformer 116B, and further transmits it to the speaker 103B through the hybrid circuit 115B and the switch circuit 105B. This control is performed by the control circuit 20 on the main device 20 side.
2 outputs a control signal to the gathering device 30 and the telephone set 10B, and on the gathering device 30 side, the sound source 306 and the speech network 309 according to the control signal.
And the switching control of the switch circuit 105B by the control signal relayed by the control circuit 310 of the collecting apparatus 30 on the side of the telephone 10B. Under this control, the speaker 1 for the ringtone
When the off-hook operation of the handset 101B is performed on the other party's telephone 10B by the ringing from 03B, the control circuit 110B of the telephone 10B detects this, and the control circuit 202 of the main device 20 is notified by the same route as the key input. Tell the effect.

In response to this, the control circuit 202 causes the sound source 306.
Signal is sent to the control circuit 310 to stop the operation of the handset 10A and the switch circuits 105A and 105B to the control circuits 110A and 110B of the telephones 10A and 10B.
A control signal is generated and transmitted so as to connect to 1A and 101B. This allows both handsets 101A, 101
A call path is formed between B and handset call becomes possible.

As for the flow of the voice signal, the transmitted voice from the telephone 10A is the handset 101A and the switch circuit 1.
05A, hybrid circuit 115A, transformer 116
A, transmission / feed line 31A, transformer 316A, hybrid circuit 315A, A / D / D / A converter 304A, speech network 309, multiplexing circuit 308, transformer 314, transmission / feed line 3, transformer 214A, multiplexing circuit 208A to PCM highway 204. Also, the voice received by the telephone set 10B is transmitted by the reverse route, and the handset 1 is transmitted from the PCM highway 204.
It is transmitted to 01B. It is also the same as transmitting the transmitted voice of the telephone 10B to the telephone 10A.

Although the telephone call is carried out in this manner, when the handset is hooked on one of the telephones 10A and 10B during the telephone call, the telephone control circuit 11
In 0A or 110B, the fact is detected and transmitted to the control circuit 202 of the main device 20, and the control circuit 202 of the main device 20 analyzes this and controls the control circuit 11 of both telephones 10A and 10B.
0A, 110B blockage of call path and display 112
Instruct to erase the display of A and 112B. In addition, the control circuit 310 of the aggregation device 30 is instructed to close the speech path of the speech network 309, and the call ends.

During a voice call, for example, when the telephone 10A is set to the voice call mode, the telephone 10
The transmitted voices of A and 10B are once input to the loudspeaker circuit 307 of the gathering device 30 and processed there, and then the telephone 10
The received voice is transmitted to A and 10B. That is,
When transmitting from the telephone 10A, the voice transmitted from the telephone 10B is turned off by the loudspeaker circuit 307 of the collecting apparatus 30 and is not transmitted to the telephone 10A. Conversely, the telephone 10
When transmitting from B, the voice transmitted from the telephone 10A is turned off by the loudspeaker circuit 307 and cannot be transmitted to the telephone 10B. It goes without saying that this control is performed by comparing the loudness of the transmitted voice.

The voice transmission and the voice reception are performed by using the microphone 102A and the speaker 103A of the telephone 10A in the voice communication mode. The speech volume of the speaker 103A is adjusted by the speech network 309 of the aggregation device 30. That is, the telephone voice transmitted from the loudspeaker circuit 307 to the telephone 10A is once input to the speech network 309, the level thereof is adjusted here, and then transmitted to the telephone 10A. This volume adjustment instruction is given by a key input from the key input circuit 111A of the telephone 10A, and the instruction by this key input is transmitted from the control circuit 110A in the telephone 10A to the control circuit 310 of the aggregation device 30. Then, the control circuit 310 inserts the speech network 309 into the voice path and sets the adjustment amount.

Besides this, the speech network 309 is inserted in the voice path in the following cases. That is the case of an incoming call during a call, and when a call is made by a third party during the call, the received voice and the sound source 3
It is used for synthesis with ringing tone from 06. In this case, the ringing tone is synthesized with the received voice while the level is suppressed to a low level. In addition, there is also a case of a call service called a three-way call, which is used for synthesizing a voice received from two call parties when a call is made by three people.

The input and output of the above audio signals are all performed by the main unit 20.
In PCM highway 204, the time division multiplexing method is used. Figure 2 illustrates this situation,
The flow of the audio | voice signal at the time of handset telephone call is shown.
There are two PCM highways 204, series 1 and series 2,
Audio signals from both parties talking here are flowing. The time division time slot is, for example, 20 divisions,
Now, in the time slot T8, the multiplexing circuits 208A, 208
It is assumed that the audio signal from B is assigned. This is because the control circuit 20 searches for an empty slot each time a call path is formed by the time slot designation signal.
2 is specified. FIG. 2 particularly shows a signal flow when one communication path is established. The time slot is generally divided into 20 as shown in FIG. 2 or 32.

FIG. 3 shows an example of the flow of a voice signal during a voice call. Speech network 3
09 and the loudspeaker circuit 307 are connected by a PC by serial transmission.
The M signal is transmitted and received. This process is basically the same as the signal flow on the PCM highway 204 of the main device 20. FIG. 3 particularly shows a signal flow when a voice call is made by one telephone. There are 2 time slots in order to input the voice from the speech network 309, compare the sizes, and output.
Use one.

Here, it is assumed that a voice call is made using the time slots 7 and 11. A /
The transmitted voice from the D / D / A converter 304 side is input to the loudspeaker circuit 307 via the time slot T7. Similarly, the voice transmitted from the multiplexing circuit 308 side is input to the loudspeaker circuit 307 via the time slot T11. The loudspeaker circuit 307 compares the sizes of both transmitted voices and selects the higher level. Then, the selected voice signal is output as a received voice to the multiplexing circuit 308 side or the A / D / D / A converter 304 side via the time slots T7 and T11. Here, the A / D / D / A converter 30
The audio signal from the 4 side is output to the multiplexing circuit 308 side,
On the contrary, the audio signal from the multiplexing circuit 308 side is A / D / D /
It is output to the A converter 304 side. The time slot is designated by the control circuit 310.

As described above, according to the present invention, the speech network 109 and the loudspeaker circuit 10 provided in the telephone 10 are provided.
7. The sound source 106 and the sound source 106 can be relocated as the speech network 309, the loudspeaker circuit 307, and the sound source 306 in the collecting device 30.

FIG. 4 shows a voice signal between the main device and the collecting device,
The flow of a control signal is shown. Here, up to eight multiplexed communication channels are taken as an example. A voice signal and a control signal are time-division multiplexed on the downlink signal and the uplink signal on two pairs of signal lines. Since the upstream and downstream signals have the same format and the control method is the same, the downstream will be described as an example.

The signal sequence is composed of framing information (F), speech channel voice signal information (Ti), and signaling information (S) in units of one packet. Framing indicates the beginning of a packet, which identifies the delimiter of the packet. In order to achieve framing synchronization,
When Ti = all 0 and S = 0, the positions of F are first indicated among the assembling devices, and when Ti and all are synchronized with each other, Ti,
Open S. After that, audio signal information is transmitted via Ti, and control signal information is transmitted from the main device 20 to the collecting device 30 via S. S is also used to indicate which channel of Ti is used. In this way, audio signals for 8 channels are multiplexed and transmitted.

As described above, in the case of a telephone, except for the essential ones in the telephone, it is possible to reduce the number of constituent elements of each telephone and reduce the power consumption of the telephone by moving them to the collective device. That is, since the power consumption W of the telephone set represented by the formula (1) is reduced, the resistance value r of the transmission / feed line can be increased correspondingly even with the same power supply voltage Vs, and the transmission distance can be extended. Furthermore, since the power wasted in the transmission / power supply line is reduced by the same amount as the energy saving on the telephone side, it is possible to reduce the power consumption in the main unit compared to the conventional system when the telephone is connected under the same conditions. The power supply capacity of can be significantly reduced.

Further, by moving some of the constituent elements in the telephone to the collecting apparatus, the following advantages are also brought about. For example, as shown in FIG. 1, since the sound sources 306 can be commonly used, it is not necessary to have the same number of telephones. The control circuit 110 in the telephone can be realized by using a cheaper MPU because the amount of information to be controlled is reduced. Speech network 309 in the aggregator 30
Although it is composed of a DSP as described above, it is suitable for DSP since it can combine a plurality of lines. That is, even if the DSP only executes the NOP instruction (no operation), the arithmetic unit, RO
M, RAM, registers, etc. are required, and processing by collectively processing a plurality of lines can be dealt with only by increasing the number of instruction ROMs, thus improving the integration efficiency.

It is not necessary to provide as many loudspeakers 307 as there are telephones, and the same can be said for the speech network 309. In other words, not all the telephones are used at the same time, so it is sufficient that the loudspeaker circuit 307 and the speech network 309 are provided according to the call volume. In particular, since the voice amplification circuit 307 has a mechanism for voice communication much smaller than that for handset communication, it can be said that a smaller number of circuits is sufficient. That is,
It is possible to reduce the circuit scale of the aggregation device, which also causes a consequent cost reduction ripple effect.

As described above, the present invention is provided with the main device for performing the switching operation and the plurality of collecting devices and telephones connected to the main device, and digital transmission is performed between the main device and the collecting device. Control signals are exchanged by voice signals using a time slot designated by the main unit by multiplexing with the main unit, and the telephone has voice signal voice input / output means for voice call, A telephone system in which power is supplied from a power source of the main device through a telephone line or is independently fed, and the collective device comprises:
A sound source for generating signals of various signal sounds, a speech network means for synthesizing the signal sound from this sound source and a transmission voice signal and transmitting the signal sound, and a signal transmission / reception with the speech network means and a sound signal transmission / reception. ,
Control for controlling the target telephone to be exchanged, and for transmitting / receiving a voice signal to / from the telephone set in the voice call mode, control for giving a control signal for voice call control to the telephone. And a means for controlling the loudspeaking call element according to the received control signal, and a telephone control means for performing voice signal input / output with the loudspeaking call element and outputting a signal sound. In addition, the control means of the collecting apparatus is provided with a function of controlling to transmit a confirmation sound from the sound source by the sound source to the operation telephone, and to the control means of the collecting apparatus. On the telephone side, the telephone control means is provided with a function for controlling a control signal associated with the operation of the telephone itself to be sent to the main device via the collecting device.

In such a configuration, the collecting device is provided with a sound source for generating various signal sound signals necessary for the telephone side, a synthesis of the signal sound and the transmitted voice signal from the sound source, and the sending of the signal sound. There is a speech network means to do, ringing to the telephone, DTMF tones,
Key operation etc. is generated from this sound source, and this is sent to the target telephone to be delivered / received under the control of the control means on the side of the collecting device, and the telephone side receiving this makes a signal sound. It is sent to the system and the user of the telephone is notified by sound. Also, when making a voice call, the control means on the side of the aggregator knows this and performs control for the voice call by the control signal from the telephone set to the voice call. On the side of the telephone set to the mode 2, switching control of the loudspeaking call element is performed, and a call can be made from the loudspeaking call element side.

As described above, according to the present invention, the sound source for generating various kinds of signal sound signals required on the telephone side, which is conventionally provided in each telephone, and the sending control of the signal sound from this sound source and the control of the signal level are performed. Move the speech network means to the aggregating device, omit these from the telephone side, control the generation of signal sounds and signal levels, and further perform the necessary control at the time of a loud voice call by the aggregating device side. There is. As a result, the components on the telephone side are
The load is reduced as well, and therefore the power supply that must be supplied to the telephone side has a smaller capacity than before, and the loss is small even if the distance of the communication line becomes long. Therefore, the power supply capacity of the main unit can be suppressed, and even if the system becomes large, the power supply capacity of the main unit can be greatly reduced compared to the conventional one, and even if a telephone terminal is added later, the degree of freedom becomes higher than before. growing.

The present invention is not limited to the embodiments described above and shown in the drawings, and it is needless to say that the present invention can be appropriately modified and implemented without departing from the scope of the invention. For example, in the above embodiment, the sound source, the loudspeaker circuit, and the speech network were transferred from the telephone to the collective device.
In the case of a system for making a voice call, a voice amplification circuit is originally unnecessary, and in this case, the sound source and the speech network can be modified as necessary, such as by moving them to a collective device.

Further, in the present invention, the collecting device and the telephone set are connected by two pairs of wires, but one pair of wires may be used as in the case of the main device and the collecting device. In this case, the voice signal and the control signal are digitally multiplexed by the multiplexing circuit between the collecting device and the telephone, the hybrid circuit is not required, and the A / D / D / A converter is moved to the telephone side. become. The former can be said to be an effective means when the collecting device is relatively close to the telephone and the latter is relatively far from the telephone.

In the present invention, the power supply to the collective device is performed from the main device through the signal / power supply line, but a system in which power is supplied from an external power source as in the main device may be used.
The former is effective when the speech channel multiplexing of the aggregation device is not relatively large, and the aggregation device is relatively far from the main device, and the latter is large when the speech channel multiplexing is large and the main device and the aggregation device are large. It can be said that it is an effective means when there is a distance. Further, although the present invention describes the embodiment relating to the operation between two telephones connected to the same collecting apparatus, it goes without saying that a call with a telephone connected to another collecting apparatus can be similarly performed. Is.

[0060]

As described in detail above, according to the present invention,
Conventionally, a sound source for generating various signal sound signals required on each telephone side, which is provided in each telephone, and a speech network means for controlling transmission of a signal sound from this sound source and level control are moved to the aggregating device. By omitting these from the telephone side and controlling the generation of signal sound and signal level, and the necessary control during a loud call, the collecting side implements the components on the telephone side. As a result, the load is also reduced, and the power supply that must be supplied to the telephone side has a smaller capacity than before, resulting in less loss even if the distance of the communication line becomes longer. for that reason,
The power supply capacity of the main unit can be suppressed, and even if the system becomes large, the power supply capacity of the main unit can be greatly reduced compared to the conventional one, and even if a telephone terminal is added later, it has a greater degree of freedom than before. It is possible to provide a telephone system having advantages such as being able to deal with it.

[Brief description of drawings]

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

FIG. 2 is a time chart showing the flow of a voice signal during a handset call in the digital telephone system of the present invention.

FIG. 3 is a time chart showing the flow of a voice signal during a voice call in the digital telephone system of the present invention.

FIG. 4 is a time chart showing the flow of a voice signal and a control signal between the main device and the collecting device of the digital telephone system of the present invention.

FIG. 5 is a block diagram showing the configuration of a conventional digital telephone system of this type.

[Explanation of symbols]

10A, 10B telephone 101A, 101B handset 102A, 102B microphones 103A, 103B speakers 105A, 105B switch circuit 110A, 110B control circuit 111A, 111B key input circuit 112A, 112B display 113A, 113B power supply 115A, 115B hybrid circuit 116A, 116B transformer 117A, 117B pulse transformer 20 Main device 201 Trunk circuit 202 control circuit 203 power supply 204 PCM Highway 205 control bus 208A, 208B multiplexing circuit 30 collecting device 304A-304C A / D / D / A converter 305 control bus 306 sound source 307 Loudspeaker circuit 308A, 308B multiplexing circuit 309 Speech Network 310 Control circuit 313 power supply 314A, 314B, 316A-316C transformer 315A to 315C hybrid circuit 317A-317C pulse transformer 3A, 3B, 31A, 31B Transmission / feed line

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04Q 3/58 107 7190-5K

Claims (3)

[Claims] 1. A main device for performing an exchange operation, a plurality of collective devices connected to the main device, and a plurality of telephones connected to the collective device, wherein the main device and each of the collective devices are connected to each other. Exchange control is performed by transmitting and receiving voice signals and control signals by multiplexing by digital transmission, and call control is performed by exchanging voice signals by analog transmission and control signals by digital transmission between the collecting device and each of the telephones. A digital telephone in which the power supply of the collecting device is supplied from the power supply of the main device through a communication line or independently, and the power supply of the telephone is supplied from the main device through the communication line through the collecting device. In the system, the collecting device includes a sound source that generates signals of various signal sounds, and an on-transmission of signal sounds from the sound source to the telephone. -Speech network means for performing off control and level control of a transmission signal, and transmission and reception of a signal from the speech network means and a voice signal from the telephone are controlled so as to be performed with respect to a telephone to be exchanged, When transmitting and receiving a voice signal to and from a telephone set in a voice call mode, a control means for controlling the telephone to give a control signal for controlling a voice call to the telephone is provided and configured. Output means and voice signal loudspeaker input means, and controlling the voice signal loudspeaker output means and voice signal loudspeaker input means according to the received control signal, and voice signals to these voice signal loudspeaker output means and voice signal loudspeaker input means. Digital telephone characterized by being provided with telephone control means for controlling input / output and signal sound output Talk system. 2. A main device performing an exchange operation, a plurality of collective devices connected to the main device, and a plurality of telephones connected to the collective device, the main device and each of the collective devices. During the period, the voice signal is digitized to digitally multiplex the communication channels, the control signal is commonly used for the multiple channels, and the voice signal and the control signal are digitally multiplexed to perform exchange control. Call control is performed by exchanging a voice signal by analog transmission and a control signal by digital transmission between the collecting device and each of the telephones, and the power supply of the collecting device is supplied from the power supply of the main device through a communication line or independently. Is a digital telephone system in which power is supplied from the main unit through a communication line from the main unit through the collecting unit. Thus, the aggregating device includes a sound source for generating signals of various signal tones, a speech network unit for performing on / off control of transmission of signal tones from the sound source to the telephone and a level control of the signal to be transmitted, and the speech. The transmission and reception of the signal from the network means and the voice signal from the telephone are controlled so as to be carried out with respect to the telephone to be exchanged, and the transmission and reception of the voice signal with the telephone set in the loud-speaking call mode are performed. A control means for controlling to give a control signal for controlling a voice call to the telephone set and to send a confirmation sound from the sound source from the sound source to the operating telephone set is provided. Each telephone has a voice signal loudspeaker output means and a voice signal loudspeaker input means, and the voice signal loudspeaker output means and a voice signal loudspeaker output means according to the received control signal. A digital telephone system characterized in that it is provided with telephone control means for controlling the voice signal loudspeaker input means while sending a control signal associated with the operation of the own telephone to the collective device and the main device. . 3. The call control is performed by transmitting and receiving a voice signal and a control signal by multiplexing by digital transmission between the collecting device and the telephone.
Or the digital telephone system described in 2.