Digital broadcasting receiver

Details Digital broadcasting receiver Digital broadcasting receiver

1996-08-12

1999-09-21

Lee, Michael

Television

Receiver circuitry

Automatic frequency control

348726, 348555, 4552452, 455207, H04N 546, H04N 544

Patent

active

059560983

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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IEEE Transactions on Consumer Electronics, vol. 36, No. 3, Aug. 30, 1990, New York, US, pp. 407-413, M. McGinn: An Advanced I.F. Amplifier & AFT System Suitable for HDTV.

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