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Title:
BAND SWITCHING TYPE VIDEO INTERMEDIATE FREQUENCY WAVE CIRCUIT
Document Type and Number:
Japanese Patent JPS5961284
Kind Code:
A
Abstract:

PURPOSE: To receive TV signals of plural different broadcasting types only by one receiver, by turning on and off between a bridge T type trap which is connected to the front stage of a surface wave filter and provided with a coil and the earth.

CONSTITUTION: A bridge T type trap 4 provided with a coil L1 inserted on the earth side and a bridge T type trap 5 provided with a coil L2 and a resistor R2 inserted on the earth side are connected between an connection terminal 1 to a tunner and a preamplifier 3 connected to the front stage of a surface wave filter 2. A switching diode D6 is connected between the common connection point of the coil L1 and the resistor R2 and the earth and the diode D6 is connected to a power supply through a switch SW1 and a resistor R3. A filter 4 has PAL- G type characteristics and the traps 4, 5 form NTSC type adjacent video carrier and sound trap respectively and receive a PAL-G type TV signal when the SW1 is "off" and an NTSC type TV signal in case of "on".


Inventors:
ARAI HARUICHI
Application Number:
JP17203682A
Publication Date:
April 07, 1984
Filing Date:
September 29, 1982
Export Citation:
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Assignee:
MURATA MANUFACTURING CO
International Classes:
H04N5/44; H04N9/64; (IPC1-7): H04N5/48
Attorney, Agent or Firm:
Nishizawa Hitoshi



 
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