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Image signal selector for television receiver combined with video cassette recorder
| Details |
Inventors: Yun, Jin H.;
Assignee: Goldstar Co., Ltd. (Seoul, KR)
Primary Examiner: McElheny, Jr.; Donald
Assistant Examiner:
Attorney, Agent or Firm: Casella; Anthony J., Hespos; Gerald E.
The invention provides a device that selects the input image signal out of image signals of a TV set, VCR and an external apparatus in the TV with VCR. The device includes two ICs for switches Nos. 1 and 2, muting circuits 4 and 5, inverters 8, image signal insulation section 12, LED drive 17 and photocoupler 18. The ICs operate the internal switches according to the low or high voltage applied to respective control terminals T0, T1 and L0, L1. The image signal insulation 12 insulates to perform amplification and DC clamping in compliance with the input image signals. |
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DETAILED DESCRIPTION OF THE INVENTION Referring to the drawing, the invention shall be described in details.
According to the invention, inputs A0 and A1 of IC 1 for switch No.
1 respectively connect with VCR image signal input 6 and image signal input 7 of the external apparatus via buffers 2 and 3 and with muting circuits 4 and 5, and input A2 connects with VCR image signal control 9 via inverter 8.
Switching control terminals T0 and T1 both connect to the image signal control terminal 10 of the external apparatus and to the input of muting circuit 4.
Output 00 of IC 1 connects to muting circuit 5, and output 01 connects with the input B1 of IC 13 for switch No.
2 via buffer 11 and image signal insulation section 12.
Outputs B0 and B2 of IC 13 both connect with TV image signal input 16 via buffer 14 and TV image output section 15.
Control terminals L0 and L1 are arranged to receive control signals from the VCR image signal control 9 and the external apparatus image signal control 10 respectively via resistors R4 and R5, diodes D1 and D2, LED drive 17 and photocoupler 18.
Output U2 of IC 13 connects with image signal output 21 via buffer 19 and TV image input section 20.
Numeral and literal codes not mentioned above indicate the following: Numeral 1201 indicating an ultrared ray diode drive of the photocoupler, 1202 a photocoupler, 1203 an image amplifying circuit, 1204 a direct current claming circuit, 1205 a buffer, 02 the output of IC 1, U0 and U1 outputs of IC 13, C1-C6 capacitors, R1, R2, R3, R6-R14 resistors, D0 a LED, Q0 a phototransistor, Vcc a power source.
The operation of the invention shall be described in details.
The ICs 1 and 13 for switchings operate the internal switches in accordance to the voltage (low or high) applied to respective control terminals T0, T1 and L0, L1.
The image signal insulation section 12 insulates image signals with the front and rear sections of the photocoupler 1202 to perform amplification of DC clamping in compliance with respective input image signals
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TV Signal 
