JP2894188B2 - Telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone apparatus, an extension telephone of a private branch exchange, and a telephone directly connected to a central office exchange, and more particularly to a telephone for reducing an extreme sound at the end of a call.

[0002]

2. Description of the Related Art FIG. 4 is a schematic block diagram of a conventional telephone.

In FIG. 4, reference numeral 1 denotes a control unit for controlling the entire telephone set, and 2 denotes an incoming call detecting unit connected between lines L1 and L2 connected to a central office line or a PBX extension. 1 has been notified. Reference numeral 3 denotes a dial transmitting unit inserted in series with the line L, which transmits a dial pulse according to a command from the control unit 1 and forms a DC loop. 4 is a DC loop holding circuit connected between the lines L1 and L2, 5 is a DC signal cutting capacitor, 6 is a speech transformer connected between the lines L1 and L2, and 7 is a side tone control connected to the speech transformer 6. Hybrid part (HY
B), and the hybrid unit 7 includes a handset 8
Receiver 9 and microphone 10 are connected via a receiving amplifier 11 and a transmitting amplifier 12.

A power supply unit 13 converts electric energy from a central office line or a PBX extension line into a power supply for internal control of the telephone.
Reference numeral 14 denotes a speaker connected to the hybrid unit 7 and the control 1 via an amplification unit 15, and reference numeral 16 denotes a monitoring unit that monitors a state of a hook switch and a key input.

Next, the operation of the above conventional example will be described.
First, an incoming call will be described. When an incoming signal arrives, the incoming signal is detected by the incoming detecting unit 2 and the incoming signal is transmitted to the control unit 1. The control unit 1 generates a ringtone by sounding the speaker 14 via the speaker amplification unit 15. When a telephone user or the like who senses a ring tone from the speaker 14 picks up the handset 8 and turns on the hook switch, a signal for answering the incoming call is transmitted from the monitoring unit 16 to the control unit 1. As a result, the control unit 1 turns on the contact point of the dial sending unit 3, forms a DC loop through the DC loop holding circuit unit 4, and sends a response signal to a local line or a PBX extension.

When the communication circuit is formed by turning on the contact of the dial transmitting unit 3, the voice signal from the office line or the PBX extension is transmitted to the contact of the dial transmitting unit 3 and the capacitor 5, the telephone transformer 6, the hybrid unit. 7. The signal is transmitted to the receiver 9 in the handset 8 via the telephone amplifier 11.

The transmission signal from the own telephone is transmitted to the handset 8.
The signal is input from a microphone 10 in the telephone, and is transmitted to a central office line or a PBX extension line via contacts of a transmission amplification unit 12, a hybrid unit 7, a communication transformer 6, a capacitor 5, a dial transmission unit capacitor 5, and a dial transmission unit 3.

Next, a description will be given of the time of transmission. Monitoring unit 1
The control unit 1 having received the off-hook information from the control unit 6 controls the dial sending unit 3 to form a DC loop, and
To send a line capture signal. Next, when key information is input from the monitoring unit 16 to the control unit 1, the control unit 1 controls the dial sending unit 3 and transmits the dial information to the local line or the P line.
Send to BX. When the station or the PBX responds, the communication state is established, and the transmission and reception of voice is the same as when receiving a call.

At the end of the first call, the on-hook information is transmitted from the monitoring unit 1 to the control unit 1 and the control unit 1 turns off the contact point of the dial sending unit 3.

[0010] As described above, the above-mentioned conventional telephone is capable of making and receiving calls, and is capable of ending calls.

[0011]

However, in the above-mentioned conventional telephone, since the communication path is connected until the hook switch is turned on at the end of the first call, the moment the handset 8 is placed on the telephone body, Before the hook switch is turned on, the sound of contact between the handset 8 and the telephone body is input from the microphone 10 of the handset 8 and transmitted as an extreme sound to the other party.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an excellent telephone which can reduce an excessive sound to a communication partner at the end of a call due to a pioneering handset.

[0013]

In order to achieve the above object, the present invention provides a telephone set connected to a central office line or a PBX extension, and a handset connected to a telephone circuit of the telephone set and containing a receiver and a microphone. A non-audible signal transmission source provided in the telephone main body and operating when a call is established, and provided in the telephone main body, wherein the microphone picks up when the handset approaches the telephone main body. Non-audible signal detection means for detecting non-audible signals, and mute means connected to the transmission path of the microphone and attenuating the transmission volume of the microphone based on a detection signal output from the non-audible signal detection means, The configuration was provided with.

[0014]

Therefore, according to the present invention, by detecting that the handset approaches the telephone body during a call,
It is possible to reduce an extreme sound to the other party at the end of the call due to the first handset.

[0015]

FIG. 1 shows a configuration according to an embodiment of the present invention.

In FIG. 1, the same parts as those of FIG. 4 are denoted by the same reference numerals, and the description of the structure will be omitted.

That is, according to this embodiment, the non-audible signal source 17 controlled by the control unit 1 and the output signal from the microphone 10 picked up through the microphone 10 when the handset 8 is brought close to the telephone body. A non-audible signal detecting unit 18 for detecting a non-audible signal is provided in the telephone body, and a mute circuit unit 1 controlled by the control unit 1
Reference numeral 9 denotes a place where a transmission voice path connecting the transmission amplification unit 12 and the hybrid unit 7 is newly provided.

Next, the operation of the above embodiment will be described.
In this embodiment, the operation from the incoming call to the call state and the operation from the outgoing call to the call state are the same as those in the above-described conventional example, and the description is omitted.

Hereinafter, a call termination operation based on the first call from a call state will be described with reference to FIGS. 1, 2 and 3.

FIG. 2 shows a timing chart in the embodiment of the present invention. The non-audible signal source 17 and the non-audible signal from the standby state to the call state, the end operation by the first party, and the standby state. FIG. 4 is a timing chart for control of a detection unit 18, a dial transmission unit 3, and a transmission mute circuit unit 19;

At a point a in FIG. 2, the contact point of the dial sending section 3 in FIG. 1 is turned on to form a DC loop, and a call state is established. Simultaneously with the call state, the control unit 1 turns on the non-audible signal source 17 of the telephone body of FIG. Is started by the non-audible signal detection unit 18.

FIG. 1 illustrates the call state at this time.
The telephone sound from the office line or the PBX extension is transmitted to the receiver 9 in the handset 8 via the contact point of the dial transmission unit 3, the capacitor 5, the communication transformer 6, the hybrid unit 7, and the telephone amplification unit 11.

Transmission is performed from the microphone 10 in the handset 8 to the local line through the transmission amplifier 12, the mute circuit 19, the hybrid unit 7, the communication transformer 6, the capacitor 5, and the dial transmitter 3. Alternatively, it is transmitted to the PBX extension.

At this time, the mute circuit section 19 is off, and there is no loss in the mute circuit section 19.

When the handset 8 is brought close to the telephone main body by ending the call and entering the end-call operation by the user's first call, the non-audible signal generated from the non-audible signal source 17 is transmitted to the microphone in the handset 8. The non-audible signal is detected by the non-audible signal detection unit 18 from the output signal from the microphone 10, and the detection signal is output to the control unit 1. Upon receiving this signal, the control section 1 immediately turns on the mute circuit section 19 to mute the transmission. This state is point b in the timing chart of FIG. At this time, the contact point of the dial sending unit 3 is in an on state, and the sound pickup by the microphone 10 is
It is transmitted to the office line or PBX extension. However, since the mute is operated in the mute circuit section 19, the extreme sound generated by the contact at the moment when the handset 8 is placed on the telephone body is reduced. Then, when the on-hook is performed at the point c in FIG. 2, all the controls are turned off and the apparatus enters a standby state.

FIG. 3 is a timing chart when the user tries to end the call by using his / her first call from the call state. Is shown.

The point d in FIG. 3 is a state in which the non-audible signal detecting unit 18 detects the end-of-call operation of the first call from the talking state, and the control unit 1 turns on the mute circuit unit 19.
If the user disregards it at the point e in FIG. 3, the mute is released. In this series of operations, the mute is released when the handset is brought close to the face of the user, and the mute is released, so that there is no problem in actual use. Also, point f and g in FIG.
Regarding the point, the operation is the same as the point b and the point c in FIG.

As described above, according to the above-described embodiment, if the handset 8 is to be placed on the telephone body side during the telephone call due to the end of the first call, the non-audible signal source 17 Non-audible signal from handset 8
The microphone is picked up by the internal microphone, and the non-audible signal is detected by the non-audible signal detection unit 18 from the output signal to mute the voice path of the transmission. Handset 8 has an extreme sound due to contact between phone 8 and phone
Even if the extreme sound is picked up by the microphone 10 inside, it is possible to reduce the extreme sound and to prevent the extreme sound from being transmitted to the other party.

[0029]

As is apparent from the above embodiment, the present invention detects the operation of the handset going on-hook to the telephone body during a call and detects the non-audible signal source through the microphone of the handset. It monitors with the non-audible signal detection unit and mutes the voice path of the transmission when the non-audible signal detection unit detects the non-audible signal. Extreme sounds due to contact can be reduced, and the extreme sounds can be prevented from being transmitted to the other party.

Further, in the present invention, since non-audible signals are used, the present invention can be realized without affecting the telephone conversation.

[Brief description of the drawings]

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

FIG. 2 is a timing chart for explaining an operation in the embodiment of the present invention.

FIG. 3 is a dimming diagram for explaining an operation in the embodiment of the present invention.

FIG. 4 is a schematic block diagram of a conventional telephone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control part 2 Incoming detection part 3 Dial sending part 4 DC loop holding circuit part 5 Capacitor 6 Calling transformer 7 Hybrid part 8 Handset 9 Receiver 10 Microphone 11 Receiving amplification part 12 Transmission amplification part 13 Power supply part 14 Speaker 15 Speaker amplification part 16 Hook switch / key input monitoring section 17 Non-audible signal source 18 Non-audible signal detection section 19 Mute circuit section

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-312342 (JP, A) JP-A-4-356850 (JP, A) JP-A-3-106157 (JP, A) 18857 (JP, U) Japanese Utility Model 4-64840 (JP, U) Japanese Utility Model 1-160775 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04M 1/00

Claims (1)

(57) [Claims] 1. A telephone equipped with a telephone body connected to a central office line or a PBX extension, and a handset connected to a telephone circuit of the telephone body and having a receiver and a microphone built therein. An inaudible signal transmission source that operates when the condition is established, an inaudible signal detection unit that is provided in the telephone body and detects the inaudible signal picked up by the microphone when the handset approaches the telephone body; and the microphone. And a mute unit connected to the transmission path of (1) and attenuating the transmission volume of the microphone based on a detection signal output from the non-audible signal detection unit.