Television – Basic receiver with additional function – Multimode
Patent
1997-03-19
2000-05-09
Peng, John K.
Television
Basic receiver with additional function
Multimode
348725, 348607, 348737, 348729, 375216, 375217, 455553, H04N 544, H04N 538
Patent
active
060610964
ABSTRACT:
Radio receivers for receiving DTV signals, in accordance with the Advanced Television System Committee (ATSC) standard, or analog TV, in accordance with the National Television Systems Committee (NTSC) standard, each use a single first detector for both types of signal. This single is followed with an intermediate-frequency amplifier providing amplification both for digital television signal and for the amplitude-modulated NTSC video carrier of an analog television signal. Preferably, the shared intermediate-frequency amplifier is a high-band intermediate-frequency amplifier having fixed gain and having its bandwidth determined using a surface-acoustic-wave filter with flat-amplitude midband response, steep-slope skirts, and linear phase throughout its passband. A second mixer, which downconverts the high-band intermediate-frequency amplifier response to a low-band intermediate-frequency signal, is followed by a respective low-band intermediate-frequency amplifier for digital television signal and a respective low-band intermediate-frequency amplifier for the amplitude-modulated NTSC video carrier of an analog television signal. The respective low-band intermediate-frequency amplifier for digital television signal employs automatic gain control of reverse type and avoids automatic gain control of forward type in order to maintain linearity of gain. The respective low-band intermediate-frequency amplifier for the amplitude-modulated NTSC video carrier employs automatic gain control of forward type in order to keep noise figure lower.
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Peng John K.
Sajous Wesner
Samsung Electronics Co,. Ltd.
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