H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/12 (2006.01) H04N 5/40 (2006.01) H04N 5/76 (2006.01) H04N 9/797 (2006.01) H04N 9/80 (2006.01) H04N 9/84 (2006.01) H04N 7/13 (1990.01)
Patent
CA 2074596
DIGITAL MODULATORS FOR USE WITH SUB-NYQUIST SAMPLING OF RASTER-SCANNED SAMPLES OF IMAGE INTENSITY Abstract of the Disclosure Apparatus useful in electronics for the tape recording of a video signal, which is a baseband signal of a prescribed bandwidth extending up to a prescribed maximum frequency, processes the video signal to generate a folded-spectrum video signal. The video signal is digitized and supplied to a digital band-splitting filter with a cross-over frequency at one-half said prescribed maximum frequency, for separating the digitized video signal into samples of a lower-frequency-band component and into samples of a higher- frequency-band component. A balanced modulator is connected for modulating a folding carrier wave of the prescribed maximum frequency, which modulation is done in accordance with the higher- frequency-band component to generate a balanced modulation signal; and the balanced modulation signal is linearly combined with the lower-frequency-band component to generate the folded-spectrum video signal. Preferably, the sampling rate of the digitized video signal is exactly the Nyquist rate of the prescribed maximum frequency, reduces the balanced modulation of a suitably phased folding carrier wave to multiplication of successive samples of the modulating signal alternately by plus one and by minus one. Such multiplications are done without having to use a digital multiplier.
Strolle Christopher H.
Weckenbrock Hermann J.
R. William Wray & Associates
Samsung Electronics Co. Ltd.
Strolle Christopher H.
Weckenbrock Hermann J.
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