Television – Receiver circuitry – Automatic frequency control
Patent
1995-02-09
1996-11-05
Lee, Micheal H.
Television
Receiver circuitry
Automatic frequency control
348726, 348556, 4552452, 455207, H04N 546, H04N 544
Patent
active
055722644
ABSTRACT:
To make it possible to receive a modulated signal which is obtained by suppressing a carrier signal such as a high definition TV signal which is digitally demodulated such as QAM (quadrature amplitude modulation), a receiver of the double super-heterodyne system having the first and second mixers 9 and 13 is a basic constitution. A band pass filter having a flatness in pass band and a small deviation of group delay which will prevent the demodulation of a high definition TV signal from degradation is used a first intermediate frequency filter 11. An SAW filter is used as a second intermediate frequency filter 16. The third mixer 28 for converting a second intermediate frequency signal to a third intermediate frequency signal in frequency is installed and the frequency of the third intermediate frequency signal to be converted is set to a value lower than the frequency of the second intermediate frequency signal. The demodulator 33 for a high definition TV signal is installed so as to demodulate a high definition TV signal included in the third intermediate frequency signal.
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Igarashi Yutaka
Mizukami Hiroyuki
Nagashima Toshio
Hitachi , Ltd.
Lee Micheal H.
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