H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/18
H04N 9/83 (2006.01) H04N 5/92 (2006.01) H04N 9/79 (2006.01)
Patent
CA 1232679
ABSTRACT OF THE DISCLOSURE An apparatus for reproducing from a magnetic tape first and second video signals which are frequency modulated on a carrier, the first video signal having the center frequency of the carrier lower than that of the second video signal is disclosed, which includes a demodulator for demodulating the first and second video signals, a first low-pass filter coupled to the demodulator for filtering the first and second video signals demodulated by the demodulator, the first low pass filter having a first cut-off frequency, a second low-pass filter coupled to the demodulator for filtering the first and second video signals demodulated by the demodulator, the second low-pass filter having a second cut-off frequency which is lower than the first cut-off frequency, a detector connected prior to the demodulator for detecting whether a reproduced video signal is the first or second video signal and for generating a control signal in response thereto and a switching circuit for selectively supplying the output signal of the first and second low-pass filters to an output terminal in accordance with the control signal from the detector. There is also disclosed an apparatus for recording and reproducing a video signal, which includes a first modulator for frequency modulating a video signal with a first frequency carrier, a second modulator for frequency-modulating the video signal with a second frequency carrier, a recording head for recording the video signal frequency-modulated by the first or second modulator on a magnetic tape, a reproducing head for reproducing the video signal recorded on the magnetic tape, a detector for detecting whether the video signal reproduced from the magnetic tape is frequency-modulated with the first frequency carrier or with the second frequency carrier, and for generating a control signal, and a first switching circuit for selectively activating the first and second modulator in accordance with the control signal, a frequency of the carrier used in recording subsequent to reproducing being coincident with a frequency of the carrier used in the reproducing.
474078
Gowling Lafleur Henderson Llp
Sony Corporation
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