KR19990041874A - Telephone frequency detector of television - Google Patents

Abstract

The present invention relates to a television capable of detecting an incoming signal of a telephone. To make a phone call while watching television, the voice output of the television must be reduced so that the caller is not disturbed. The present invention is to reduce the intensity of the audio output of the television to a certain level by receiving the signal from the television when making or making a phone call while watching a television, and to reduce the original audio output to the original audio output level when the telephone is finished. When using a telephone, the television is equipped with a reception antenna, a receiver, and a volume control unit to receive telephone frequency transmitted from the main phone or the self of the wireless telephone, and when the telephone frequency is received from the telephone, The invention consists of a configuration for adjusting the size.

Description

Telephone frequency detector of television

The present invention relates to a television capable of sensing received and transmitted signals of a telephone. In particular, the present invention relates to a television apparatus for detecting a telephone frequency of a television which can receive incoming and outgoing signals of a radiotelephone to reduce a certain amount of audio output of a television.

If a call is received from outside while watching television at home, the voice of the television interferes with the call, so it is common to reduce the voice of the television or use it as far as the distance of the television.

However, the conventional method described above has been inconvenient, such as waiting for the call counterpart to reduce the size of the audio output of the television using a remote controller or the like. In addition, when the telephone must be used at a certain distance away from the television, there is a problem in that an important program broadcast on the television cannot be viewed.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems in the case where the television and the telephone are to be used at the same time. An object of the present invention is to provide a television with a receiving apparatus capable of receiving a frequency transmitted from the telephone and receive a telephone The present invention provides a television frequency sensing device of a television capable of adjusting the size of the audio output of a television by a signal.

1 is a schematic block diagram of a wireless telephone.

2 is a block diagram of an embodiment of a television with telephone frequency sensing device of the present invention.

3 is a detailed circuit diagram of a telephone signal receiver, which is an essential part of FIG.

<Description of Symbols for Main Parts of Drawings>

1: incoming call detection 2: telephone circuit

3: controller 4: signal modulator

5: wireless transmission unit 6: transmission antenna

7: television antenna 8: tuner unit

9: IF detector 10: P / S separator

11: Image signal processor 12: Image output unit

13: CRT 14: voice signal processing unit

15: voice amplifier 16: speaker

17: reception antenna 18: telephone signal receiver

19: micom 20: volume control unit

50: frequency receiver 60: amplifier

Hereinafter will be described in detail with reference to the accompanying drawings for the configuration and operation of the embodiment for achieving the above object of the present invention.

1 is a block diagram of a main phone of a typical radiotelephone which transmits a frequency through an antenna when using a telephone. When a call is made by wire or wireless from the outside or the user wants to make an external call, the incoming call detection unit 1 detects the corresponding signal, and the call is turned on and off according to the signal from the incoming detection unit 1 above. Telephone circuit section 2 for signal processing, signal modulator 4 for modulating the signal applied from telephone circuit section 2, incoming call detection section 1, telephone circuit section 2, and signal modulator ( A control unit 3 for controlling the signal processing of 4) and a wireless unit 5 for receiving the output signal of the signal modulator 4 so as to transmit the signal wirelessly through the transmission antenna 6. do.

In the above-mentioned telephone, when a telephone call is received from the outside, the incoming call detection section 1 detects a telephone signal from the telephone line and sends an incoming call detection signal to the control section. The control section receives an incoming call detection signal from the incoming call detection section 1 and applies the incoming call detection signal to the telephone circuit section 2 to turn on the telephone. The signal modulator 4 modulates the telephone signal output from the telephone circuit unit 2 according to the control signal of the controller 3. The radio transmitter 5 processes the signal applied from the signal modulator 4 into a signal suitable for radio transmission and transmits the signal to the public through the transmission antenna 6.

2 is a block diagram of a television capable of sensing the telephone frequency of the present invention. An antenna 7 for receiving a composite video signal transmitted from a broadcasting station, a tuner unit 8 for tuning a broadcast channel that the user wants to watch among a plurality of composite video signals received by the antenna 7, and the tuner described above. IF detector 9 for detecting and amplifying the intermediate frequency from the composite video signal applied from the sub-step 8, P for separating the video signal and the audio signal from the composite video signal input from the fraudulent IF detector 9; / S separation unit 10, a video signal processing unit 11 for demodulating the applied video signal separated from the P / S separation unit 10, the video signal applied from the video signal processing unit 11 An image output unit 12 for luminance and chromaticity processing and outputting to the CRT 13, an audio signal processor 14 for removing residual color signals from the applied audio signal separated from the P / S separation unit 10; The output signal of the voice signal processor 14 is amplified by voltage amplification. The voice amplifier 16 outputs to the beaker 16, the reception antenna 17 for receiving the telephone frequency received by the telephone of Figure 1, the telephone signal receiver for detecting and amplifying the telephone frequency received from the reception antenna ( 18), the microcomputer 19 for receiving the output signal of the telephone signal receiver 18 and outputting a control signal, and the audio signal processor 14 and the voice according to the control signal applied from the microcomputer 19. Volume control section 20 for applying a volume control signal to the amplifier 15.

3 is a specific circuit diagram of a telephone signal receiver which is a main part of the embodiment of the present invention described above. The antenna 17 and the signal detection unit 50 are connected via a capacitor C2, and the signal detection unit 50 is a Schottky-barrier diode D1 and D2. ) Is configured in parallel, the resistor R2 is connected to the forward output direction of the diode D2, and the diode D1 is connected to the capacitor C1 and coupled in parallel with the amplifier 60. The amplification unit 60 includes an OP AMP U1 coupled to the diodes D1 and D2 of the signal detection unit 50, a resistor coupled in parallel with the capacitor C1, and a resistor R2 ( R1, R3).

The operation of the present invention will be described with reference to FIGS. 2 and 3. The program of the broadcast channel received by the antenna 7 and tuned by the tuner unit 8 is displayed on the CRT 13, and at the same time, the corresponding television audio signal is output through the speaker 16. In such a state, when a telephone signal received from the outside is received from a telephone located near the television, and the telephone is turned on according to the output signal of the incoming call detection unit 1, the telephone frequency is transmitted to the transmission antenna 6 above. .

The transmission frequency of the telephone is received by the reception antenna 17 of the television unit 200 and applied to the telephone signal receiver 18. The telephone signal receiver 18 detects a signal from the signal detector 50 for detecting a fine transmission frequency of the telephone.

The transmit power of the telephone is quite low and Schottky barrier diodes D1 and D2 are used to receive such low transmit power. Schottky barrier diodes are two-terminal devices called surface barriers or hot carrier diodes and are diodes with metal-semiconductor junctions using metals such as molybdenum, platinum, chromium and tungsten.

The reason for using the Schottky barrier diode is that the barrier at the junction of the Schottky barrier diode is lower than the barrier of the PN junction device in the forward bias region and the reverse bias region, so that the low transmit power can be properly distinguished and received. .

When a weak frequency transmitted from the telephone is applied to the reception antenna 17, only a few kHz low voltage is induced in the reception antenna 17, and the low voltage induced by the reception antenna 17 is coupled to the coupling capacitor C2. DC component is blocked by, and also serves as impedance matching.

The signal detecting unit 50 uses the Schottky barrier diodes D1 and D2 to apply the low voltage applied after the impedance matching by the coupling capacitor C2 to the diode D2, and the diode D1 to the reverse direction. Allow signal to pass through The capacitor C1 connected to the diode D1 and the resistor R1 connected to the diode D2 serve as a filter for passing only a predetermined frequency, and are filtered by the capacitor C1 and the resistor R1. Is input to the OP AMP (U1) of the amplifier 60.

The first amplifier 60 is a bias resistor R1 and R3 connected to the OP AMP is a bias resistor, a bias used to set a desired operating point on the operating characteristics of the device by passing a current through the resistor and the voltage across the resistor Used as a minute.

The small signal through the bias resistor is amplified by the OP AMP U1, which is the amplifier 60, and applied to the microcomputer 19.

When the telephone frequency is applied to the microcomputer 19 as an amplified signal, the microcomputer 19 applies a control signal to the voice signal processing unit 14 to provide information about the current volume level. The control signal is applied to the volume control unit 20 so as to lower the size of the audio output to the size previously set in the microcomputer 19.

The volume control unit 20 senses a signal from the voice signal processor 14 according to a control signal applied from the microcomputer 19 and controls the voice amplifier 15 to lower the size of the voice output. . On the other hand, when the user finishes using the telephone and hooks off the telephone, no telephone frequency is received by the telephone signal receiver 18 so that no signal is output to the output terminal of the amplifier 60. In this case, the microcomputer 19 recognizes no signal and applies a control signal to the volume control unit 20 so as to convert the magnitude of the voice output signal to the previous intensity.

The volume control unit 20 receiving the control signal from the microcomputer 19 receives the information about the volume level before the conversion according to the reception of the telephone frequency stored in the microcomputer 19 and the voice amplifier unit ( 20) to adjust the size of the audio output.

Referring to the configuration and operation of the embodiment of the present invention as described above in more detail the state of use of the present invention can be carried out in the following procedure. When a call comes in or a user switches on the telephone to make a call, the main phone of the radiotelephone transmits the natural frequency of the telephone to the self via the transmission antenna 6.

In the television, the telephone signal detection unit 18 detects the telephone frequency received through the telephone frequency reception antenna 17 capable of receiving the transmitted frequency. The audio output of the television is adjusted to the volume set in advance by the detected signal. The user talks to the other party through the telephone. Switch off the phone after the call. Simultaneously with the telephone cut off, transmission of the telephone frequency stops. The television detects the interruption state of the telephone frequency and restores the audio output of the television.

As described above, when a telephone is used to receive a telephone frequency transmitted from a parent or self of a wireless telephone, the television is provided with a reception antenna, a receiver, and a volume control unit. By configuring the size of the audio output of the television to be adjusted, the present invention provides a telephone signal receiver 18 comprising a signal detector 50 and an amplifier 60 capable of receiving a telephone frequency transmitted from a general wireless telephone to a television. ) And the volume control unit 20, and these configurations allow the volume of the television to be adjusted according to the control of the microcomputer 19, so that the user can use the telephone near the television to make a call due to the loud audio output of the television. It does not interfere with the effect.

Claims (3)

In a television in which the intensity of the audio output of the television is automatically adjusted when a telephone is to be used, Telephone frequency reception means for receiving a frequency received by the telephone; And a volume control means for adjusting the audio output of the television according to the input of the telephone frequency. 2. The apparatus according to claim 1, wherein said telephone signal receiving means comprises: a receiving antenna 17 for receiving telephone frequency; Telephone frequency receiver of the television, characterized in that consisting of a telephone signal receiver 18 for sensing and amplifying the telephone frequency received from the reception antenna (17). The telephone signal receiver (18) according to claim 1, wherein the telephone signal receiver (18) is connected via the reception antenna (17) and the capacitor (C2), and the Schottky barrier diodes (D1, D2) are configured in parallel. The signal sensing unit 50 is connected to the resistor D2 in the forward output direction of the diode D2, the diode D1 is connected to the capacitor C1, and is coupled in parallel with the amplifier 60; An amplifier comprising an OP AMP (U1) coupled to the diodes (D1, D2) of the signal detection unit 50, the capacitor (C1), resistors (R1, R3) coupled in parallel with the resistor (R2) Telephone frequency sensing device of a television, characterized in that consisting of (60).