Digital television signal receiver

Details Digital television signal receiver Digital television signal receiver

1997-05-19

2000-09-12

Lee, Michael H.

Television

Receiver circuitry

Demodulator

348735, 348731, 4551891, 4552452, 455207, H04N 546, H04N 544

Patent

active

061184993

ABSTRACT:
A first mixer outputs a TV signal of a first intermediate frequency (the first IF) by up-converting an input signal. A second mixer outputs a TV signal of the second intermediate frequency (the second IF) by down-converting the TV signal of the first IF. The second IF is chosen to be different and below the conventional intermediate frequency used by single super-heterodyne analog TV tuners. By choosing a sufficiently low second IF, the passband signal can be directly sampled by an analog to digital converter after being filtered by a low pass filter. Thus, a digital television broadcast receiver tuner is achieved which can be used with a direct passband sampling type digital demodulator.

REFERENCES:
patent: 4633315 (1986-12-01), Kasperkovitz
patent: 4789897 (1988-12-01), Kappeler et al.
patent: 4901151 (1990-02-01), Mehrgardt et al.
patent: 5390346 (1995-02-01), Marz
patent: 5548344 (1996-08-01), Park
patent: 5572264 (1996-11-01), Mizukami et al.
patent: 5841814 (1998-11-01), Cupo

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