JPS59189761A - Telephone set - Google Patents

Abstract

PURPOSE:To stop surely the generation of a voice signal to cut off the transmission without disconnecting a line by using a mechanical switch or a semiconductor element to provide a means, which cuts off the voice signal from a transmitter, in a telephone set. CONSTITUTION:When a hook switch 10 is hooked off to start the call, a transistor TR 4 is left furned off, and the voice signal is generated by a voltage applied to a transmitter 1 and is transmitted to the line by a network 2. If a push- button switch 5 or 6 is depressed in the call state, a high level is inputted to an AND gate 11. When only one push-button switch is depressed, the output of the AND gate 11 is in the low level still, and consequently, the TR 4 is turned off, and the call permission state is held, and only when two push-buttons 5 and 6 are depressed simultaneously, the output of the AND gate 11 becomes high-level, and an output Q of a flip flop 9 is inverted to become high-level. As the result, the R 4 is turned on to cut off the generation of the voice signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a means for interrupting voice signals in a telephone in a talking state.

Traditionally, when you don't want the other party to hear the sound from you, you cover the mouthpiece with your hand, but with this method, the sound leaks from between your fingers, making it impossible to completely block out the sound. Another drawback was that the mouthpiece could not be pressed down when the user was away from the telephone.

In order to solve this problem, the present invention equips a telephone with means for cutting off the voice signal from the transmitter, and will be described in detail below using embodiments.

Figures 1 and 2 show an embodiment of the present invention in which a mechanical switch is used as the interrupting means, and 1 is a transmitter, 2 is a connection network with a telephone line, and 6 is a interrupter. be.

Normally, the audio signal obtained from the transmitter 1 is sent to the network 2.
However, if the switch 6 is operated here, no voltage will be applied to the handset 1 and no voice signal will be generated, making it possible to reliably cut off only the voice signal without disconnecting the telephone line. I can do it. Furthermore, if a state-holding type switch is used as the switch 3, it becomes possible to leave the telephone while the voice is cut off. Furthermore, when using a state-holding type switch, it would be more convenient if the switch could be automatically set to a state in which a call can be made when the user goes on-hook.

FIG. 6 shows an embodiment of the present invention in which a transistor is used as the cut-off means, in which 1 is a transmitter, 2 is a connection network with a telephone line, 4 is a cut-off transistor, 5 and 6 are pushbutton switches, 7 and 8 are chattering removal circuits, 9 is a flip-flop, 10 is a footer switch, and 11 is an AND gate.

Hook switch 1o is at high level when on-hook and low level when off-hook.Using the telephone 1. If not, reset the 7-linopflo knob 9 and turn off the i-transistor 4, so that when the off-footer is turned off, it always starts from a state in which it is possible to make a call.

When the hook switch 1o is turned off-hook and a call is started, the transistor 4 remains off and a voice signal is generated by the voltage applied to the transmitter 1.

It is transmitted to the line by network 2. In the talking state, when the pushbutton switch 5 is pressed, a high level is input to the chattering removal circuit 7, and after chattering is removed, a high level is input to the AND gate 11.

Similarly, when the pushbutton switch 6 is pressed, a high level is input to the AND gate 11.

If only one pushbutton switch is pressed, the output of the AND gate 11 remains at a low level, and therefore the transistor 4 remains off and ready for communication, and at the same time the two pushbutton switches 5 and 6 are pressed. Only when pressed, the AND gate 11's tB signal becomes high level, and the output Q of the 7-lip front panel 9 is inverted and becomes high level. As a result, the transistor 4 is turned on and the generation of the audio signal can be interrupted.

This state continues even if the pushbutton switch is turned off, but if the two pushbutton switches 5 and 6 are further pressed at the same time, the output Q of the flip-flop 9 is inverted again and becomes low level, and the transistor 4 is turned off. Return to call status.

In this way, two pushbutton switches5. By pressing O and O at the same time, you can cyclically repeat the interruption and transmission of the audio signal, so it is possible to leave the telephone without leaving the interruption.

In this case, the cutoff transistor 4 is connected in parallel with the transmitter 1, but if the output of the flip 70 knob 9 is reversed in phase, the first F:
Similar to the mechanical switch 3 of No. 4, the same effect can be obtained even if it is connected in series with the transmitter 1. In addition, when cyclic cutoff and transmission are performed by pressing three or more pushbutton switches at the same time, the inputs to the chattering removal circuit and the AND gate may be set to the same number as the number of pushbuttons. On the other hand, if you want to perform a cyclic operation by pressing one specific pushbutton switch, remove the chattering removal circuit 17, the anti-games 1 and 11, and directly connect the output OUT of the chattering removal circuit to the flip knob 70. 9 clock input cL
It is sufficient to apply it to . If the audio signal is to be cut off only while the pushbutton switch is pressed, the flip 70 tab 9 may be removed and the output of the AND gate 11 may be directly connected to the base of the transistors 4.

As explained above, by stopping the generation of voice signals, it is possible to reliably cut off the transmission without disconnecting the line, which prevents the conventional voice leakage, and furthermore, by providing a holding function, it is possible to cut off the transmission without disconnecting the line. Reliable shutoff is possible even when there is a problem.

[Brief explanation of the drawing]

1 and 2 are diagrams showing an embodiment of the present invention using a mechanical switch. Fig. 3 shows an embodiment of the present invention in a push-button telephone.
Cut-off switch 4... Cut-off transistor 5.6... Push button switch 7.8... Chattering removal circuit 9...
Flip 70 Knob 10...Hook Switch 11...And Gate and above Applicant Suwa Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami

Claims (7)

[Claims] (1) When a telephone is in a talking state, a means is provided to prevent transmitting only the voice signal from the transmitter without disconnecting the line.
A telephone characterized by: (2) The telephone according to item 1, wherein a mechanical switch is used as the means, and the switch is installed on the telephone body or the handset. (3) The telephone according to the first aspect, characterized in that a semiconductor element is used as the means, and transmission and interruption of the RF voice overlapping signal is controlled by electric signals. (4) In a push-button telephone, 'i-1ε is used to cut off the voice signal only while a specific push button is pressed.
7. The telephone according to item 6, characterized in that it generates a strong sense of energy. (5) A push-button telephone according to item 3, characterized in that the telephone generates an electrical signal for cutting off voice signals only while at least two or more push buttons are pressed at the same time. (6) A push-button telephone according to item 3, characterized in that the telephone generates a lightning signal for cyclically repeating transmission and interruption of audio signals each time a specific push button is pressed. . (7) In the push-button telephone, the telephone according to paragraph 6 is characterized in that it generates an electric signal for cyclically repeating transmission and interruption of voice signals each time at least two or more push buttons are pressed simultaneously. .