Magnetic recording apparatus for recording video and two kinds of audio signals
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorShuzo Hitotsumachi
Life of this patent
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Abstract
A recording and reproducing apparatus includes three groups of magnetic heads. A sound signal is converted into a corresponding frequency-modulated signal and is also converted into a corresponding digital signal. The frequency-modulated sound signal is recorded into and reproduced from a magnetic tape via the first group of magnetic heads. The digital sound signal is converted into a corresponding quadrature phase shift keying signal. The quadrature phase shift keying sound signal is recorded into and reproduced from the magnetic tape via the second group of magnetic heads. A video signal is recorded into and reproduced from the magnetic tape via the third group of magnetic heads.
Claims5
A recording and reproducing apparatus comprising:
- (a) a first group of magnetic heads having different azimuth angles, a second group of magnetic heads having different azimuth angles which also differ from the azimuth angles of the magnetic heads in the first group, and a third group of magnetic heads having different azimuth angles which also differ from the azimuth angles of the magnetic heads in the first and second groups;
- (b) a first modulator converting a first input signal into a corresponding frequency-modulated signal;
- (c) means for applying an output signal of the first modulator to the first group of the magnetic heads;
- (d) a first demodulator demodulating a signal reproduced via the first group of the magnetic heads;
- (e) a first digital signal processor converting the first input signal into a corresponding digital signal and processing the digital signal;
- (f) means for applying an output signal of the digital signal processor to the second group of the magnetic heads;
- (g) a second digital signal processor processing a signal reproduced via the second group of the magnetic heads and converting the reproduced and processed signal into an analog signal;
- (h) a first signal processor separating an input video signal into a luminance signal and a color signal;
- (i) a second modulator converting output signals of the first signal processor into a corresponding frequency-modulated luminance signal and a corresponding down-converted chrominance signal;
- (j) means for applying an output signal of the second modulator to the third group of the magnetic heads;
- (k) a second demodulator converting a signal, reproduced via the third group of the magnetic heads, into a luminance signal and a color signal;
- (l) a second signal processor converting output signals of the second demodulator into a video signal;
- (m) a detector sensing a sensed portion of a magnetic tape cassette and generating a detection signal representative thereof;
- (n) means for enabling the application of the output signal of the first digital signal processor to the second group of the magnetic heads in accordance with the detection signal;
- and
- (o) means for increasing a frequency of a carrier of the frequency-modulated luminance signal in accordance with the detection signal.
Dependencies are inferred from the claim text.