Magnetic recording and/or reproducing apparatus
阅读：709发布：2022-03-02
专利汇可以提供Magnetic recording and/or reproducing apparatus专利检索，专利查询，专利分析的服务。并且In recording periodic information signals, such as, the chrominance signal components of color video signals, having first or field intervals which are further subdivided into second or line intervals and which are recorded in successive parallel tracks on a record medium, interference or cross-talk between signals recorded in adjacent tracks is reduced or eliminated during reproduction by recording the information signals in adjacent tracks with first and second carriers having different frequencies. Upon reproducing the information signals recorded in adjacent tracks with such first and second carriers, the reproduced signals are reconverted to have a common carrier frequency by means of respective first and second reconverting signals which similarly have different frequencies selected so that, although an information signal reproduced from a particular track and reconverted to the common carrier frequency will pass through a comb filter, the cross-talk signals reproduced simultaneously from adjacent tracks will be reconverted to have carrier frequencies at nodes of the comb filter so as to be eliminated by the latter. The circuits by which the first and second carriers and the first and second reconverting signals are produced during recording and reproducing operations, respectively, each include a phase-locked loop having a voltagecontrolled variable frequency oscillator whose output frequency is suitably changed in successive field intervals, and preferably in which the center frequency of the voltage-controlled variable frequency oscillator is also changed in the successive field intervals for obtaining rapid stabilization of the respective output frequency.，下面是Magnetic recording and/or reproducing apparatus专利的具体信息内容。
1. In apparatus by which periodic information signals having an original carrier frequency are recorded in successive parallel tracks on a record medium, and in which frequency coNverting means receives said information signals with said original carrier frequency and first and second frequency converting signals are alternately applied to said frequency converting means for causing the latter to convert the carrier of said information signals to different first and second carrier frequencies with which the information signals are recorded in tracks that are next adjacent to each other: a circuit for producing said first and second frequency converting signals comprising a phase-locked loop including a voltage-controlled variable frequency oscillator for producing an output signal at a frequency determined at least by a control voltage applied thereto, means for producing a reference signal, comparator means receiving predetermined ratios of said output signal and said reference signal, respectively, and comparing the same to provide said control voltage for the voltage-controlled oscillator, and means selectively providing first and second values of one of said ratios which values respectively correspond to said first and second frequency converting signals; and control means selecting said first and second values of said one ratio during the recording of said information signals in said tracks that are next adjacent each other.
2. An apparatus according to claim 1; in which said information signals are comprised of first intervals and predetermined numbers of second intervals included in each of said first intervals; said second intervals are recorded in respective areas of the successive parallel tracks with the ends of the margins between the successive areas in which said second intervals are recorded in each of said tracks being aligned, in the direction transverse to the lengths of the tracks, with the adjacent ends of the margins between the successive areas in which said second intervals are recorded in the next adjacent tracks; and said first and second carrier frequencies are in frequency-interleaving relationship to each other, and to said original carrier frequency and the frequency of said second intervals.
3. An apparatus according to claim 1; in which said means selectively providing said first and second values of said one ratio includes first and second frequency dividers receiving said output signal of the voltage-controlled oscillator and respectively having first and second dividing ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency divided outputs of said first and second frequency dividers to said comparator means.
4. An apparatus according to claim 1; in which said means selectively providing said first and second values of said one ratio includes first and second frequency multipliers receiving said reference signal and respectively having first and second multiplying ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency multiplied outputs of said first and second frequency multipliers to said comparator means.
5. An apparatus according to claim 1; further comprising means responsive to said control means for changing the center frequency of said voltage-controlled oscillator during the recording of said information signals in said tracks that are next adjacent each other.
6. An apparatus according to claim 5; in which said means for changing the center frequency of the voltage-controlled oscillator includes sources of first and second bias voltages, and means for alternately superposing said first and second bias voltages on said control voltage applied from said comparator means to said voltage-controlled oscillator.
7. An apparatus according to claim 5; in which said voltage-controlled oscillator has a resonance circuit with inductive and capacitive elements to determine said center frequency; and said means for changing said center frequency includes an additional one of said elements, and means for seLectively including and removing said additional element in respect to said resonance circuit.
8. In apparatus for recording and reproducing periodic information signals having an original carrier frequency, and which comprises recording means for recording the information signals in parallel tracks on a record medium including frequency converting means receiving said information signals with said original carrier frequency, and means for alternately applying first and second frequency converting signals to said frequency converting means for causing the latter to convert the carrier of said information signals to different first and second carrier frequencies with which the information signals are recorded in tracks that are next adjacent to each other; and reproducing means including transducer means for reproducing information signals recorded in each of said tracks along with cross-talk signals from tracks next adjacent thereto, frequency reconverting means receiving the reproduced information signals and cross-talk signals, means for alternately applying first and second frequency reconverting signals to said frequency reconverting means so as to cause the latter to reconvert the carrier of said information signals reproduced from each of said tracks to a common carrier frequency while the carriers of said cross-talk signals are reconverted to still other carrier frequencies, and comb filter means adapted to pass the frequency reconverted information signals with said common carrier frequency and to substantially block said cross-talk signals reconverted to said other carrier frequencies: said means for alternately applying the first and second frequency converting signals and said means for alternately applying said first and second frequency reconverting signals each comprising a phase-locked loop including a voltage-controlled variable frequency oscillator for producing an output signal at a frequency determined at least by a control voltage applied thereto, means for producing a reference signal, comparator means receiving predetermined rations of said output signal and said reference signal, respectively, and comparing the same to provide said control voltage for said voltage-controlled oscillator, and means selectively providing first and second values of one of said ratios which respectively correspond to said first converting and reconverting signals and to said second converting and reconverting signals; and control means selecting said first and second values of said one ratio during the recording and reproducing of said information signals in said tracks that are adjacent each other.
9. An apparatus according to claim 8; in which said information signals are comprised of first intervals and predetermined numbers of second intervals included in each of said first intervals; said second intervals are recorded in respective areas of the successive parallel tracks with the ends of the margins between the successive areas in which said second intervals are recorded in each of said tracks being aligned, in the direction transverse to the lengths of the tracks, with the adjacent ends of the margins between the successive areas in which said second intervals are recorded in the next adjacent tracks; and said first and second carrier frequencies are in frequency-interleaving relationship to each other, and to said original carrier frequency and the frequency of said second intervals.
10. An apparatus according to claim 8; in which said means selectively providing said first and second values of said one ratio includes first and second frequency dividers receiving said output signal of the voltage-controlled oscillator and respectively having first and second dividing ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency divided outputs of said first and second frequency dividers to said comparator means.
11. An apparatus according to claim 8; in which Said means selectively providing said first and second values of said one ratio includes first and second frequency multipliers receiving said reference signal and respectively having first and second multiplying ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency multiplied outputs of said first and second frequency multipliers to said comparator means.
12. An apparatus according to claim 8, further comprising means responsive to said control means for changing the center frequency of said voltage-controlled oscillator during the recording and reproducing of the information signals in said tracks that are next adjacent each other.
13. An apparatus for reproducing periodic information signals which have been recorded in parallel tracks on a record medium with the information signals recorded in tracks that are next adjacent each other having first and second carrier frequencies, and in which the information signals reproduced from each of the tracks along with cross-talk signals from the tracks next adjacent thereto are received by frequency reconverting means which has first and second frequency reconverting signals alternately applied thereto for causing the frequency reconverting means to reconvert the carrier of the information signals reproduced from each of the tracks to a common carrier frequency passing through a comb filter means while the carriers of the cross-talk signals are reconverted to still other carrier frequencies which are substantially blocked by said comb filter means: a circuit for producing said first and second frequency reconverting signals comprising a phase-locked loop including a voltage-controlled variable frequency oscillator for producing an output signal at a frequency determined at least by a control voltage applied thereto, means for producing a reference signal, comparator means receiving predetermined ratios of said output signal and said reference signal, respectively, and comparing the same to provide said control voltage for the voltage-controlled oscillator, and means selectively providing first and second values of one of said ratios which values respectively correspond to said first and second frequency reconverting signals; and control means selecting said first and second values of said one ratio during the reproducing of said information signals in said tracks that are next adjacent each other.
14. An apparatus according to claim 13; in which said information signals are comprised of first intervals and predetermined numbers of second intervals included in each of said first intervals; said second intervals are recorded in respective areas of the successive parallel tracks with the ends of the margins between the successive areas in which said second intervals are recorded in each of said tracks being aligned, in the direction transverse to the lengths of the tracks, with the adjacent ends of the margins between the successive areas in which said second intervals are recorded in the next adjacent tracks; and said first and second carrier frequencies are in frequency-interleaving relationship to each other and to said original carrier frequency and the frequency of said second intervals.
15. An apparatus according to claim 13; in which said means selectively providing said first and second values of said one ratio includes first and second frequency dividers receiving said output signal of the voltage-controlled oscillator and respectively having first and second dividing ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency divided outputs of said first and second frequency dividers to said comparator means.
16. An apparatus according to claim 13; in which said means selectively providing said first and second values of said one ratio includes first and second frequency multipliers receiving said reference Signal and respectively having first and second multiplying ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency multiplied outputs of said first and second frequency multipliers to said comparator means.
17. An apparatus according to claim 13; further comprising means responsive to said control means for changing the center frequency of said voltage-controlled oscillator during the reproducing of the information signals in said tracks that are next adjacent each other.
18. An apparatus according to claim 17; in which said means for changing the center frequency of the voltage-controlled oscillator includes sources of first and second bias voltages, and means for alternately superposing said first and second bias voltages on said control voltage applied from said comparator means to said voltage-controlled oscillator.
19. An apparatus according to claim 17; in which said voltage-controlled oscillator has a resonance circuit with inductive and capacitive elements to determine said center frequency; and said means for changing said center frequency includes an additional one of said elements, and means for selectively including and removing said additional element in respect to said resonance circuit.
20. In apparatus by which video signals having luminance and chrominance signal components and being comprised of field intervals and line intervals are recorded in respective areas of successive parallel tracks on a record medium with the ends of the margins between the areas in which the line intervals are recorded in each of said tracks being aligned, in the direction transverse to the lengths of the tracks, with the adjacent ends of the margins between the areas in which the line intervals are recorded in the next adjacent tracks, and in which frequency converting means receives said chrominance signal components with an original carrier frequency and alternately converts the latter to different first and second carrier frequencies in response to the application to said frequency converting means of first and second frequency converting signals, respectively, so that said chrominance signal components are recorded with said first and second carrier frequencies in the tracks that are next adjacent to each other: a circuit for producing said first and second frequency converting signals comprising a phase-locked loop including a voltage-controlled variable frequency osocillator for producing an output signal at a freqeuency determined at least by a control voltage applied thereto, means for producing a reference signal, comparator means receiving predetermined ratios of said output signal and said reference signal, respectively, and comparing the same to provide said control voltage for the voltage-controlled oscillator, and means selectively providing first and second values of one of said ratios which values respectively correspond to said first and second frequency converting signals; and control means selecting said first and second values of said one ratio during the recording of said video signals in said tracks that are next adjacent each other.
21. An apparatus according to claim 20; in which said original carrier frequency of the chrominance signal components is in frequency-interleaving relation to the frequency of said line intervals, and said first and second carrier frequencies are in frequency-interleaving relation to each other and to said original carrier frequency and said line interval frequency.
22. An apparatus according to claim 20; in which said means selectively providing said first and second values of said one ratio includes first and second frequency dividers receiving said output signal of the voltage-controlled oscillator and respectively having first and second dividing ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency divided Outputs of said first and second frequency dividers to said comparator means.
23. An apparatus according to claim 20; in which said means selectively providing said first and second values of said one ratio includes first and second frequency multipliers receiving said reference signal and respectively having first and second multiplying ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency multiplied outputs of said first and second frequency multipliers to said comparator means.
24. An apparatus according to claim 20; further comprising means responsive to said control means for changing the center frequency of said voltage-controlled oscillator during the recording of said chrominance signal components in said tracks that are next adjacent each other.
25. An apparatus according to claim 20; in which a frequency modulator modulates a carrier with said luminance signal components so as to provide the resulting frequency modulated luminance signal component with a band substantially higher than said chrominance signal components with said first and second carrier frequencies, a mixing circuit combines said frequency modulated luminance signal component with said chrominance signal components having said first and second carrier frequencies to provide a composite video signal for recording, said record medium is magnetic, and first and second magnetic transducers having gaps with different azimuth angles are provided for recording said composite video signal in said next adjacent tracks, respectively.
26. In an apparatus for reproducing video signals having luminance and chrominance signal components and comprised of field intervals and line intervals which are recorded in respective areas of successive parallel tracks on a record medium with the ends of the margins between the successive areas in which said line intervals are recorded in each of said tracks being aligned, in the direction transverse to the lengths of said tracks, with the adjacent ends of said margins in the next adjacent tracks, and with said chrominance signal components of video signals recorded in next adjacent tracks having different first and second carrier frequencies, and in which transducer means scan along said tracks one at a time so as to reproduce the video signals recorded in each of said tracks along with cross-talk signals from the tracks next adjacent thereto, means separate said chrominance signal components from the luminance signal component in the reproduced signals, frequency reconverting means receives the separated chrominance signal components and has first and second frequency reconverting signals alternately applied thereto for causing the frequency reconverting means to reconvert the separated chrominance signal components of video signals reproduced from each of said tracks to have a common carrier frequency which passes through a comb filter means while the chrominance signal components of the cross-talk signals are reconverted to other carrier frequencies which are blocked by said comb filter means: a circuit for producing said first and second frequency reconverting signals comprising a phase-locked loop including a voltage-controlled variable frequency oscillator for producing an output signal at a frequency determined at least by a control voltage applied thereto, means for producing a reference signal, comparator means receiving predetermined ratios of said output signal and said reference signal, respectively, and comparing the same to provide said control voltage for the voltage-controlled oscillator, and means selectively providing first and second values of one of said ratios which values respectively correspond to said first and second frequency reconverting signals; and control means selecting said first and second values of said one ratio during the reproducing of said video signals in said tracks that are next adjacent each other.
27. An apparatus According to claim 26; in which said record medium is magnetic, said next adjacent tracks have the video signals magnetically recorded therein with different azimuths, said transducer means includes first and second reproducing magnetic transducers having gaps with different azimuths corresponding to said azimuths of the next adjacent tracks and respectively reproducing video signals recorded in the latter so as to suppress the luminance signal components of the cross-talk signals.
28. An apparatus according to claim 26; in which said means selectively providing said first and second values of said one ratio includes first and second frequency dividers receiving said output signal of the voltage-controlled oscillator and respectively having first and second dividing ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency divided outputs of said first and second frequency dividers to said comparator means.
29. An apparatus according to claim 26; in which said means selectively providing said first and second values of said one ratio includes first and second frequency multipliers receiving said reference signal and respectively having first and second multiplying ratios corresponding to said first and second values of said one ratio, and switch means operated by said control means for alternately applying the frequency multiplied outputs of said first and second frequency multipliers to said comparator means.
30. An apparatus according to claim 26; further comprising means responsive to said control means for changing the center frequency of said voltage-controlled oscillator during the reproducing of the video signals in said tracks that are next adjacent to each other.
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