JPH04249458A - Telephone set - Google Patents

Abstract

PURPOSE:To talk with a party by reducing external noise entering together with a talker's voice. CONSTITUTION:External noise is converted in comjunction with a talker's voice to an electric signal by a transmitting section 2, and at the same time, after the externoise is converted by an external noise conversion section 3 to an electric signal, the converted external noise is polarly inversed by a polarity inversing section 4, and the inversed electric signal of external noise becomes polarly nearly opposite to the electric signal of the external noise component converted by the transmitting section 2 and they are symmetric to each other. Next, the electric signal from the transmitting section 2 and the electric signal generated from the polarity inversing section 4 are added together at a composing section 5, the former component of the electric signal of the external noise has a characteristic reverse to the characteristic of the latter electric signal, they cancel each other due to their symmetry, and only the voice signal component is sent to subscriber's line 6 via a telephone set circuit section 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone set, and more particularly to a telephone set installed in an environment with a large amount of external noise.

0002

2. Description of the Related Art Conventionally, this type of telephone has been used as a means for reducing external noise by amplifying the received sound by the receiver operating a switch or volume control provided for adjusting the gain of the receiver. recognized the voice of the person.

0003

[Problems to be Solved by the Invention] The above-mentioned conventional telephone has an external noise reducing means in which the receiver amplifies the received sound by operating a switch or volume provided for adjusting the gain of the receiver. Since the system is designed to identify the voice of the person who is speaking, the ambient noise from the person who is speaking is amplified, which may make it difficult to identify the voice of the person who is speaking. However, there is a disadvantage in that it is cumbersome to adjust the gain of the received voice by operating the switch or volume of the handset.

[0004] Furthermore, since the ratio between the speaker's voice and the amount of external noise cannot be changed, if the speaker's voice is low,
A drawback is that it may be difficult to identify the voice due to external noise.

[0005]

[Means for Solving the Problems] The telephone set of the present invention includes: a transmitter that converts the voice of a caller into an electrical signal and sends it; an external noise converter that converts surrounding external noise into an electrical signal; A polarity reversing section that inverts the polarity of the electrical signal from the external noise converting section and sends it out, and reducing the external noise by adding together the electrical signal from the transmitting section and the electrical signal from the polarity reversing section. and a signal synthesis section that performs

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, the telephone of this embodiment has a telephone circuit section 1 connected to a subscriber's line 6, a transmitting section 2, and an electrical signal that converts external noise around the telephone of this embodiment into an electrical signal. an external noise converter 3 that converts the external noise; a polarity inverter 4 that inverts the polarity of the electrical signal from the external noise converter 3 and sends it out;
It is configured to include a combining section 5 that adds the electrical signal from the transmitting section 2 and the electrical signal from the polarity reversing section 4 and sends the result to the telephone circuit section 1.

Next, the operation of this embodiment will be explained.

The external noise is converted into an electrical signal together with the voice of the speaker by the transmitter 2, and at the same time is converted into an electrical signal by the external noise converter 3, the polarity of which is inverted by the polarity inverter 4, and the signal is transmitted. The electrical signal component of the external noise converted into an electrical signal by the talking unit 2 becomes a symmetrical electrical signal with characteristics almost opposite to that of the electrical signal component.

[0011] Next, by adding together the electric signal from the transmitting unit 2 and the electric signal from the polarity reversing unit 4 in the combining unit 5, the components of the external noise electric signal contained in each electric signal are determined. Since they have opposite characteristics and are symmetrical, they cancel each other out, and only the voice signal component is sent to the subscriber line 6 via the telephone circuit section 1.

As a result, the external noise that enters the transmitting section 2 together with the voice of the sender is reduced and is hardly transmitted to the receiver, allowing the receiver to hear almost only the voice of the sender.

[0013]

Effects of the Invention As explained above, the present invention includes a transmitter that converts the voice of a speaker into an electrical signal and sends it, an external noise converter that converts surrounding external noise into an electrical signal, and an external noise converter that converts surrounding external noise into an electrical signal. a polarity inverter that inverts the polarity of the electrical signal from the noise converter and sends it out; a signal synthesizer that reduces external noise by adding the electrical signal from the transmitter and the electrical signal from the polarity inverter; With this feature, only the voice of the sender can be transmitted to the receiver even when there is a lot of noise in the surroundings during transmission, so the receiver can more easily recognize the voice of the sender than before. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

1　　　　Telephone circuit section 2 Transmitter section 3 External noise conversion section 4 Polarity reversal section 5. Synthesis section 6. Subscriber line

Claims (1)

[Claims] 1. A transmitter that converts the voice of a talker into an electrical signal and sends it; an external noise converter that converts surrounding external noise into an electrical signal; and an external noise converter that converts the electrical signal from the external noise converter. It is characterized by comprising a polarity reversing section that inverts the polarity and sends out the signal, and a signal synthesizing section that reduces the external noise by adding together the electrical signal from the transmitting section and the electrical signal from the polarity reversing section. A telephone set.