JPH0514955A - Digital telephone system - Google Patents

Abstract

PURPOSE:To prevent a power source device from being made into large size and to prevent the cost up of a system even when the number of telephone set to be connected and the total extension of transmission line are increased by moving a sound source and a speech network means to an aggregate device, eliminating these from a telephone set side and executing necessary controls at the time of performing a diffusion speech on the side of the aggregate device. CONSTITUTION:An analog circuit of a speech system is composed of a transformer 316 for the separation of sound signal components and power components and a hybrid circuit for four-wire/two-wire conversion 315. An A/D.D/A converter 304 as a digital circuit, a speech network 309 for it, a loud-speaker circuit 307 performing a transmission/reception switching control for the loudspeaker speech and a sound source 306, etc., are provided. These speech systems are controlled by a control circuit 310 and the circuit 310 is controlled by a main device 20 via a multiplexing circuit 308. Power source 313 of the aggregate device 30 receives power from a transmission/power feeding 3 which is a connection line for the device 20 and the device 30. The device 30 is constituted by moving a converter 304, power source 313, a network 309, a circuit 307 which were conventionally placed on the side of a telephone set and the side of a telephone set 10 is constituted by eliminating these.

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, a method of digitizing and transmitting a voice signal between a telephone and a main device such as a PBX or a key telephone device to which the telephone is connected depends on the length of the transmission line as compared with the analog method. The voice level changes,
There is no problem that the frequency characteristic of the audio signal changes due to the characteristic impedance of the transmission line, and it is a method that has been widely spread in recent years. FIG. 4 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 has two circuits, an analog circuit and a digital circuit.
Handset 1 as an analog circuit
01, microphone 102, speaker 103, and these handsets 101 and microphones 10.
2. A switch circuit 105 for switching the connection between the speaker 103 and the A / 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.

These communication systems are controlled by a control circuit 110 constructed by using a microprocessor or the like, and the control circuit 110 is placed under the control of the main unit 2 via a multiplexing circuit 108. In addition, the control circuit 1
Reference numeral 10 denotes a key input circuit 111 for key operation input and a display 112 including an LED (light emitting diode) and an LCD (liquid crystal display) for displaying the state of the telephone 1.
Are connected. 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. The transformer 114 is used for distribution of a signal and electric power, the audio signal and the control signal isolated by the transformer 114 are transmitted to the multiplexing circuit 108, and the electric power is transmitted to the power source 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. Further, the above-mentioned other constituent elements of the main device 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 is
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 performed 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 controlled to be switched here, so that the transmission and reception are alternately switched. 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, the problem of power supply limitation arises when increasing the capacity of the extension number of the telephone system. 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 r of the transmission line
Wastefully. Therefore, as the system becomes larger, the total length of the transmission line will inevitably become longer.Therefore, as the system becomes larger and the length of the transmission line increases, the resistance r increases, which reduces the amount of power that can be supplied to the telephone and increases the loss. Will be invited. 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.

[0016]

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 connected telephones and the total extension of transmission lines used for the connection increase, the power supply device becomes large. It is an object of the present invention to provide a digital telephone system capable of minimizing the cost increase of the system and the system.

[0018]

SUMMARY OF THE INVENTION The present invention comprises a main device for performing an exchange operation, a plurality of collecting devices connected to the main device, and a plurality of telephones connected to the collecting device.
Voice signals and control signals are transmitted and received between the main device and each of the aggregation devices by multiplexing by digital transmission to perform exchange control, and voice signals are transmitted and received by analog transmission and digital transmission between the aggregation device and each of the telephones. The call control is performed by transmitting and receiving a control signal by the power supply of the collecting device is supplied from the power supply of the main device through the communication line, and the power of the telephone is supplied from the main device through the communication line through the collecting device. In the digital telephone system, a sound source for generating various signal tones is provided in the collecting device, and a speech network means for performing on / off control of transmission of the signal tones from the sound source to the telephone and level control of the signal to be transmitted. And sending and receiving signals from the speech network means and voice signals from the telephone. Control means for controlling the target telephone to be performed, and for transmitting and receiving a voice signal to and from the telephone set to the voice call mode, to give a control signal for controlling the voice call to the telephone. And each of the telephones are configured by removing at least the speech network means and the sound source, and the speech signal loudspeaker output means and the speech signal loudspeaker input means, and the speech signal according to the received control signal. A telephone control means is provided for controlling the loudspeaker output means and the voice signal loudspeaker input means, and for controlling the voice signal loudspeaker output means and the voice signal loudspeaker input means for performing voice signal input / output and signal sound output control. Further, the control means of the gathering device is provided with a function of obtaining a confirmation sound from the sound source side from the sound source and controlling it so as to send it to the operation telephone. A function is added to control the control signal associated with the operation so as to be sent to the main device via the collecting device.

[0019]

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 mode, switching control of the voice signal loudspeaker output means and the voice signal loudspeaker input means is performed, and a 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 necessary for the telephone side, which has been conventionally provided in each telephone side, and the sending control and signal level control of the signal sound from this sound source are controlled. 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.

[0022]

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 composed of 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 that produces various sounds such as a ringing sound, a DTMF sound, and a key confirmation sound that is a 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 above-mentioned communication system is controlled by a control circuit 110 composed of a microprocessor or the like, and the control circuit 110 is provided with a pulse transformer 117 for assembling the device 3.
It is under the control of 0. Further, the control circuit 110 includes a key input circuit 111 for inputting a key operation and a telephone 1.
A display 112 including an LED (light emitting diode) and an LCD (liquid crystal display) for displaying the state of 0 is connected. Then, a power supply 1 for supplying electric power to the telephone 10.
13 receives power from a transmission / feed line 31 which is a connection line between the collecting device 30 and the telephone 10.

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 can take out from the PCM highway 204 to alternately transmit them. 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 to the inside of the main device 20 and also to the collective device 30 through the transmission / power supply 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 composed of a microprocessor or the like, and the control circuit 310 is placed 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. Also,
The power from the transmission / power supply line 3 is transmitted to the transmission / power supply line 31 to the telephone 10 and serves as a power source for the telephone 10.

The transmission / feed line 3 transmits a digitized voice signal and a control signal between the main unit / collection unit,
Moreover, a DC voltage is supplied from the main device 20 to the transmission / feed line 3, and the power is supplied to the collecting device 30 by utilizing this. The collecting device 30 transmits /
The connection with the power supply line 3 is made via a 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 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 308A, transformer 314.
A control signal is transmitted to the control circuit 202 through A, the transmission / feed line 3A, the transformer 214A, the multiplexing circuit 208A, and the control bus 205.

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 a route reverse 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 voice transmitted 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 308A, transformer 314A, transmission / feed line 3A, transformer 214A,
It is transmitted to the PCM highway 204 through the multiplexing circuit 208A. Also, the received voice of the telephone set 10B is transmitted by the reverse route and transmitted from the PCM highway 204 to the handset 101B. 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 in 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, if the telephone set 10A is set in the voice call mode, the telephone set 10A
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 transmitted voice 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. On the contrary, when transmitting from the telephone 10B, the transmitted voice from the telephone 10A is turned off by the loudspeaker circuit 307 and is not transmitted to the telephone 10B. It goes without saying that this control is performed by comparing the loudness of the transmitted voice. Microphones 102 of the telephone 10A in the voice call mode are used for voice transmission and reception.
A, the speaker 103A is used.

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 set 10A is temporarily transmitted to the speech network 30.
Phone 1 after being input to 9 and adjusting the level here
Passed to 0A. The telephone 10
The key input circuit 111A of A is used for key input, 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.

In addition to 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. All the input and output of the above audio signals are performed in the main device 20 by using the time division multiplexing method of the PCM highway 204.

FIG. 2 illustrates this situation. FIG. 2 shows the flow of voice signals during a handset call. There are two PCM highways 204, series 1 and series 2, and audio signals of both parties talking here are flowing. For example, the time-division time slot is divided into 20, and now, the multiplexing circuit 20 is added to the time slot T8.
It is assumed that audio signals from 8A and 208B are assigned. This is done by the time slot designating signal, and each time a communication path is formed, the control circuit 202 searches for an empty slot and designates an empty slot. The time slot is generally 20 divisions or 32 divisions as shown in FIG.

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.

Two time slots are used to input the voice from the speech network 309, compare the sizes, and output. Now, it is assumed that a voice call is being performed using the time slots 7 and 11. A / D
The transmitted voice from the 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 audio signal from the A / D / D / A converter 304 side is output to the multiplexing circuit 308 side, and conversely the audio signal from the multiplexing circuit 308 side is A / D / D / A converted. It is output to the container 304 side. The time slot is designated by the control circuit 310. In this way, according to the present invention, the speech network 109, the loudspeaker circuit 107, and the sound source 106, which are provided in the telephone 10, are connected to the collecting device 30.
Inside, a speech network 309, a loudspeaker circuit 307,
It can be relocated as the sound source 306.

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 to reduce the power consumption of the telephone by moving them to a 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.

Further, since the electric power wasted in the transmission / power supply line is reduced by the same amount as the energy saving on the telephone side, it is compared with the conventional system when the telephones are connected under the same conditions. The power supply capacity in the main unit can be greatly reduced. Furthermore, by moving some of the components in the telephone to the collecting device, 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 3 in the aggregator 30
The 09 is composed of a DSP as described above, but is suitable for DSP since it can be combined a plurality of times. 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 loudspeaker circuits 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, and a sound source that generates signals of various signal sounds is generated in the collecting device, and a signal sound from the sound source and a transmission voice signal are synthesized and A speech network means for transmitting a signal sound, and a signal transmission / reception between the speech network means and a voice signal are transmitted to and received from a telephone to be exchanged. In addition to controlling to carry out a voice signal to and from a telephone set in a voice call mode, a control means for controlling to give a control signal for voice call control to the telephone is provided. Each of the telephones is configured to be provided with telephone control means for controlling the voice call element in response to a control signal received, and performing a voice signal input / output with the voice call element and a signal sound output. The control means of the collecting apparatus is provided with a function of controlling the sound source to obtain a confirmation sound by the operation from the telephone side or the main device side and send it to the operating telephone. It is configured by adding a function of controlling to send a control signal associated with the operation of the own telephone to the main device via the collecting device.

In such a structure, the collecting device is provided with a sound source for generating various signal sound signals required on 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 such things as ringing tones to telephones and DTMF.
Sounds, key operations, etc. are generated from this sound source, and these are sent to the target telephone to be delivered / received under the control of the control means on the collecting device side. Is sent to the call 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, a sound source for generating various signal sound signals required on the telephone side, which is conventionally provided in each telephone, and control of sending out a signal sound from this sound source and controlling a 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 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.

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 carried out within the scope of the invention. For example, in the above-mentioned embodiment, the sound source, the loudspeaker circuit, and the speech network are moved from the telephone to the collective device. However, if the system carries out the loud voice call, the loudspeaker circuit is originally unnecessary, and in this case, the sound source and the speech network. Can be modified as necessary, such as by moving the device to a collecting device.

Further, in the present invention, the collecting device and the telephone are connected by two pairs of lines, but a pair of lines may be used like 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. 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.

[0057]

As described 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 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

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 system in which the power supply of the collecting device is supplied from the power supply of the main device through a communication line, and the power supply of the telephone is supplied from the main device through a communication line through the collecting device, The device includes a sound source that generates various signal sounds, and on / off control and transmission of the signal sound from this sound source to the telephone. A speech network means for controlling the level of a signal, and a transmission and reception of a signal from the speech network means and a voice signal from a telephone are controlled so as to be carried out with respect to a telephone to be exchanged, and a voice call mode is set. When transmitting and receiving a voice signal to and from the telephone, the control means is provided to control to give a control signal for voice call control to the telephone, and each telephone has a voice signal loudspeaker output means and a voice signal loudspeaker. The input means and the voice signal loudspeaker output means and the voice signal loudspeaker input means are controlled according to the received control signal, and the voice signal loudspeaker output means and the voice signal input / output and the signal sound output to the voice signal loudspeaker input means A digital telephone system characterized by comprising a telephone control means for controlling. 2. A main device that performs an exchange operation, a plurality of collective devices connected to the main device, and a plurality of telephones connected to the collective device, and between the main device and each of the collective devices. 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 system in which the power supply of the collecting device is supplied from the power supply of the main device through a communication line, and the power supply of the telephone is supplied from the main device through a communication line through the collecting device, The device includes a sound source that generates various signal sounds, and on / off control and transmission of the signal sound from this sound source to the telephone. A speech network means for controlling the level of a signal, and a transmission and reception of a signal from the speech network means and a voice signal from a telephone are controlled so as to be carried out with respect to a telephone to be exchanged, and a voice call mode is set. In transmitting and receiving a voice signal to and from the telephone, control is performed to give a control signal for controlling the voice call to the telephone, while a confirmation sound by an operation from the telephone side is obtained from the sound source and sent to the operating telephone. The respective telephones are configured to provide a voice signal loudspeaker output means and a voice signal loudspeaker input means, and the voice signal loudspeaker output means and the voice signal loudspeaker input means in accordance with the received control signal. The telephone control that controls to send the control signal associated with the operation of the own telephone to the collecting device and the main device while controlling Digital telephone systems, characterized in that which is configured by providing a means. 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.