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Title:
RECEIVER IN COMMON USE FOR DIGITAL AND ANALOG SIGNAL
Document Type and Number:
Japanese Patent JPH06253227
Kind Code:
A
Abstract:

PURPOSE: To provide an inexpensive system having lots of common use parts while receiving both an analog modulation signal and a digital modulation signal.

CONSTITUTION: A signal obtained from a band pass filter 12 is fed to phase detectors 13, 14, to which oscillation outputs from a voltage controlled oscillator 15 are fed with a phase difference of 90°. When an analog modulation signal is received, the oscillating frequency of the voltage controlled oscillator 15 is controlled by an output of the detector 15 smoothed by a low pass filter 19 and when a digital modulation signal is received, the voltage controlled oscillator 15 is controlled by the output of a phase locked loop circuit 21 phase- locked to a fixed frequency oscillator 24. When the digital modulation signal is received, outputs of the phase detectors 13, 14 are led out respectively as a Q axis component and an I axis component from a switch 17. When the analog modulation signal is received, the output of the switch 17 is a video signal output.


Inventors:
OTO HIDEKI
Application Number:
JP3334693A
Publication Date:
September 09, 1994
Filing Date:
February 23, 1993
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H04N5/44; H04N7/01; H04N7/10; (IPC1-7): H04N5/44; H04N7/01; H04N7/10
Attorney, Agent or Firm:
Takehiko Suzue



 
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