Apparatus for recording and/or reproducing video and audio signals
First Claim
1. A video and audio signal recording apparatus comprising:
- first frequency-modulating means for mcdulating a first carrier by a first audio signal to be recorded to produce a first FM audio signal;
first frequency-converting means for converting said first FM audio signal to produce a second FM audio signal having a second carrier frequency different from said first carrier;
second frequency-modulating means for modulating a third carrier by a second audio signal to be recorded to produce a third FM audio signal;
second frequency-converting means for converting said third FM audio signal to produce a fourth FM audio signal having a fourth carrier frequency different from said third;
first mixing means for mixing, with a video signal, two of said FM audio signals which represent said first and second audio signals to be recorded, respectively, and thereby providing a first mixed audio and video signal;
second mixing means for mixing the other two of said FM audio signals with said video signal and thereby providing a second mixed audio and video signal; and
first and second magnetic heads having different azimuth angles and respectively receiving said first and second mixed audio and video signals from said first and second mixing means for recording said first and second mixed signals in adjacent record tracks on a magnetic record medium.
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Accused Products
Abstract
A video and audio signal recording apparatus includes a first frequency modulator in which a first audio signal to be recorded that may represent a stereophonic left channel modulates a first carrier to produce a first FM audio signal, and a first frequency convertor converts the carrier frequency of the first FM audio signal to a different carrier frequency higher than the first carrier frequency to form a second FM audio signal. A second frequency modulator modulates a second audio signal to be recorded that may represent a stereophonic right channel to produce a third FM audio signal, and a second frequency converter converts the third FM audio signal into a fourth FM audio signal having a carrier frequency that is higher than any of the other FM audio signals so modulated. The first and third FM audio signals are mixed to form a first mixed audio signal and the second and fourth FM audio signals are mixed to form a second mixed audio signal, which are both combined in a mixing circuit with a composite color video signal to form first and second mixed audio and video signals which are fed to first and second magnetic recording heads, respectively. Reproducing apparatus reproduces the recorded signal.
32 Citations
16 Claims
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1. A video and audio signal recording apparatus comprising:
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first frequency-modulating means for mcdulating a first carrier by a first audio signal to be recorded to produce a first FM audio signal; first frequency-converting means for converting said first FM audio signal to produce a second FM audio signal having a second carrier frequency different from said first carrier; second frequency-modulating means for modulating a third carrier by a second audio signal to be recorded to produce a third FM audio signal; second frequency-converting means for converting said third FM audio signal to produce a fourth FM audio signal having a fourth carrier frequency different from said third; first mixing means for mixing, with a video signal, two of said FM audio signals which represent said first and second audio signals to be recorded, respectively, and thereby providing a first mixed audio and video signal; second mixing means for mixing the other two of said FM audio signals with said video signal and thereby providing a second mixed audio and video signal; and first and second magnetic heads having different azimuth angles and respectively receiving said first and second mixed audio and video signals from said first and second mixing means for recording said first and second mixed signals in adjacent record tracks on a magnetic record medium. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A video and audio reproducing apparatus for reproducing video and audio signals recorded as first and second mixed signals with different azimuth angles in adjacent first and second parallel tracks, respectively, on a magnetic record medium and in which said first mixed signal comprises a video signal mixed with two audio signals having different carrier frequencies and said second mixed signal comprises said video signal mixed with two other FM audio signals having different carrier frequencies, comprising:
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first and second magnetic head means having different azimuth angles corresponding to said azimuth angles with which said first and second mixed signals are recorded for scanning adjacent first and second tracks to alternately reproduce therefrom said first and second mixed signals; filter means receiving said first and second mixed signals for separating from said first mixed signal a first FM audio signal and a second FM audio signal and for separating from said second mixed signal a third FM audio signal and a fourth FM audio signal; first frequency convertor means for converting the carrier of said second FM audio signal to a frequency substantially equal to the carrier of said first FM audio signal; second frequency-convertor means for converting the carrier of said third FM audio signal to a frequency substantially equal to the carrier of said fourth FM audio signal; first switch means receiving said first FM audio signal and said second FM audio signal having a frequency converted carrier for producing a first continuous FM audio output signal formed of alternate segments thereof; second switch means receiving said fourth FM audio signal and said third FM audio signal having a frequency converted carrier for producing a second continuous FM audio output signal formed of alternate segments thereof; and frequency-demodulating means receiving said first and second continuous FM audio output signals and demodulating therefrom first and second audio signals, respectively. - View Dependent Claims (8, 9, 10, 11)
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12. In apparatus for recording and reproducing video and audio signals in successive parallel record tracks on a magnetic record medium:
- the combination of recording circuit means comprising frequency-modulating means for modulating a first audio signal to be recorded by a first carrier to produce a first FM audio signal, and frequency-convertor means for converting said first FM audio signal to a second FM audio signal having a different carrier frequency and second frequency-modulating means for modulating a second audio signal to be recorded to produce a third FM audio signal having a carrier different than said first and second FM audio signals and second frequency-convertor means for converting said third FM audio signal to a fourth FM audio signal having different carrier frequency than said first, second, or third FM audio signals, first mixing means for mixing with a video signal two of said FM audio signals which represent said first and second audio signals to be recorded, respectively, and providing a first mixed audio and video signal, and second mixing means for mixing the other two of said FM audio signals with said video signal and providing a second mixed audio and video signal;
first and second magnetic head means having different azimuth angles and scanning adjacent first and second ones of said successive record tracks on a record medium, said first and second magnetic head means being operative in a record mode of the apparatus to receive said first and second mixed audio and video signals, respectively, for recording in said first and second adjacent record tracks and said first and second head means being operative in a reproducing mode of the apparatus to reproduce alternately first and second mixed audio and video signals from said first and second adjacent record tracks, respectively; and reproducing circuit means comprising means for separating said two FM audio signals from a reproduced first mixed audio and video signal and for separating said other two FM audio signals from a reproduced second mixed audio and video signal, combining means for sequentially combining said alternately reproduced portions of the first and second audio signals, thereby providing substantially continuous frequency modulated first and second audio signals, and frequency demodulating means receiving said substantially continuous frequency modulated first and second audio signals and demodulating therefrom said first and second audio signals. - View Dependent Claims (13, 14, 15, 16)
- the combination of recording circuit means comprising frequency-modulating means for modulating a first audio signal to be recorded by a first carrier to produce a first FM audio signal, and frequency-convertor means for converting said first FM audio signal to a second FM audio signal having a different carrier frequency and second frequency-modulating means for modulating a second audio signal to be recorded to produce a third FM audio signal having a carrier different than said first and second FM audio signals and second frequency-convertor means for converting said third FM audio signal to a fourth FM audio signal having different carrier frequency than said first, second, or third FM audio signals, first mixing means for mixing with a video signal two of said FM audio signals which represent said first and second audio signals to be recorded, respectively, and providing a first mixed audio and video signal, and second mixing means for mixing the other two of said FM audio signals with said video signal and providing a second mixed audio and video signal;
Specification