Apparatus for recording/reprocucing a composite video signal with a rotary recording medium and circuit arrangement therefor

Claim 2

A circuit arrangement for use with apparatus for recording and/or reproducing a composite video signal according to a standard television system with interlaced scanning on and/or from a rotary recording medium, said circuit arrangement comprising: (a) first means responsive to horizontal and vertical sync signals of an input composite video signal to be recorded on said rotary recording medium or-horizontal and vertical sync signals synchronized with said horizontal and vertical sync signals for determining whether a present field is an odd field or an even field and producing an output signal indicative of the kind of detected field; (b) second means responsive to said horizontal sync signal and to said output signal from said first means for producing a first control signal for a period of time corresponding to said odd or even field; (c) third means for delaying, by a period equal to one half a horizontal scanning period, only odd or even field signal of said input composite video signal except for a portion around its vertical sync signal in the presence of said first control signal from said second means, thereby producing a modified composite video signal to be recorded on said rotary recording medium; (d) a record circuit responsive to said modified composite video signal for converting same into a signal suitable for recording; (e) fourth means responsive to said horizontal sync signal and to said output signal from said first means for producing a field distinguishing signal indicative of either odd field or even field; and (f) fifth means for mixing said field distinguishing signal with said signal from said record circuit so that a superposed signal is fed to a record head.

Claim 3

A circuit arrangement for use with apparatus for recording/reproducing a composite video signal as claimed in Claim 1, further comprising: (a) a reproduce circuit responsive to a reproduced signal from a reproduce head for obtaining a reproduced modified composite video signal which is then fed to said third means; (b) a detecting circuit responsive to said reproduced signal from said reproduce head for detecting said field distinguishing signal; (c) sixth means responsive to said detecting circuit for producing a second control signal for a predetermined period of time substantially corresponding to even or odd field, said second control signal being fed to said third means in place of said first control signal in reproduce mode where said reproduced modified composited video signal from said reproduce circuit is fed to said third means in place of said input composite video signal so that only even or odd field signal, which has not been delayed on recording, is delayed by one half the horizontal scanning period, thereby restoring to said input composite video signal.

Claim 4

A circuit arrangement as claimed in Claim 11 wherein said second means comprises: (a) a first counter responsive to said horizontal sync signal from said sync separator for producing an output signal when its count reaches a first predetermined number; (b) a second counter responsive to said horizontal sync signal from said sync separator for producing an output signal when its count reaches a second predetermined number which is close to a value twice said first predetermined number; and (c) a flip-flop responsive to said output signals from said first and second counters so as to produce an output signal.

Claim 5

4 . A circuit arrangement as claimed in Claim 1, 2 or 3 wherein said third means comprises: (a) a delay circuit for delaying an input signal by a period equal to one half the horizontal scanning period; (b) a switching circuit for alternately outputting an output signal from said delay circuit and said input signal.

Claim 6

A circuit arrangement as claimed in Claim 1, 2,3 or 4 wherein said fourth means comprises: (a) a counter means responsive to said horizonal sync signal for producing an output signal when its count reaches a predetermined number; (b) an oscillator for producing a predetermined frequency signal; and (c) a switching means for transmitting the predetermined frequency signal from said oscillator for a predetermined period of time.

Claim 7

A circuit arrangement as claimed in Claim 2, wherein said detecting means comprises: (a) a band pass filter repsonsive to said reproduced signal from said reproduce head; (b) a rectifier/filter responsive to an output signal from said band pass filter; (c) an integrator resposive to an output signal from said rectifier/filter; (d) a voltage comparator for comparing an output voltage from said integrator with a predetermined threshold so as to produce an output signal; and (e) a waveform shaping circuit responsive to said output signal from said voltage comparator.

Claim 8

A circuit arrangement as claimed in Claim 2, wherein said sixth means comprises a monostable multivibrator responsive to an output signal from said detecting means for producing a signal for a predetermined period of time.

Claim 9

A circuit arrangement for use with apparatus for recording and reproducing a composite video signal according to a standard television system with interlaced scanning on and/or from a rotary recording medium, said circuit arrangement comprising: (a) first means responsive to horizontal and vertical sync signals of an input composite video signal to be recorded on said rotary recording medium or horizontal and vertical sync signals synchronized with said horizontal and vertical sync signals for determining whether a present field is an odd field or an even field and producing an output signal indicative of the kind of detected field; (b) second means responsive to said horizontal sync signal and to said output signal from said first means for producing a first control signal for a period of time corresponding to said odd or even field; (c) third means for delaying, by a period equal to one half a horizontal scanning period, only odd or even field signal of said input composite video signal except for a portion around its vertical sync signal in the presence of said first control signal from said second means, thereby producing a modified composite video signal to be recorded on said rotary recording medium; (d) a record circuit responsive to said modified composite video signal for converting same into a signal suitable for recording; (e) fourth means responsive to said horizontal sync signal and to said output signal from said first means for producing a field distinguishing signal indicative of either odd field or even field; and (f) fifth means for mixing said field distinguishing signal with said signal from said record circuit so th ? t a superposed signal is fed to a record head; (g) a reproduce circuit responsive to a reproduced signal from a reproduce head for obtaining a reproduced modified composite video signal which is then fed to said third means; (h) a detecting circuit resonsive to said reproduced signal from said reproduce head for detecting said field distinguishing signal; (i) sixth means responsive to said detecting circuit for producing a second control signal for a predetermined period of time substantially corresponding to even or odd field, said second control signal being fed to said third means in place of said first control signal in reproduce mode where said reproduced modified composited video signal from said reproduce circuit is fed to said third means in place of said input composite video signal so that only even or odd field signal, which has not been delayed on recording, is delayed by one half the horizontal scanning period, thereby restoring to said input composite video signal.

Claim 10

A circuit arrangement for use with apparatus for recording and reproducing a composite video signal according to a standard television system with interlaced scanning on and/or from a rotary recording medium, said circuit arrangement comprising: (a) first means responsive to horizontal and vertical sync signals of an input composite video signal to be recorded on said rotary recording medium or horizontal and vertical sync signals synchronized with said horizontal and vertical sync signals for determining whether a present field is an odd field or an even field and producing an output signal indicative of the kind of detected field; (b) second means responsive to said horizontal sync signal and to said output signal from said first means for producing a first control signal for a period of time corresponding to said odd or even field; (c) third means for delaying, by a period equal to one half a horizontal scanning period, only odd or even field signal of said input composite video signal except for a portion around its vertical sync signal in the presence of said first control signal from said second means, thereby producing a modified composite video signal to be recorded on said rotary recording medium; (d) a record circuit responsive to said modified composite video signal for converting same into a signal suitable for recording; (e) fourth means responsive to said horizontal sync signal and to said output signal from said first means for producing a field distinguishing signal indicative of either odd field or even field; and (f) fifth means for mixing said field distinguishing signal with said signal from said record circuit so th ? t a superposed signal is fed to a record head; (g) a reproduce circuit responsive to a reproduced signal from a reproduce head for obtaining a reproduced modified composite video signal which is then fed to said third means; (h) a detecting circuit resonsive to said reproduced signal from said reproduce head for detecting said field distinguishing signal; (i) sixth means responsive to said detecting circuit for producing a second control signal for a predetermined period of time substantially corresponding to even or odd field, said second control signal being fed to said third means in place of said first control signal in reproduce mode where said reproduced modified composited video signal from said reproduce circuit is fed to said third means in place of said input composite video signal so that only even or odd field signal, which has not been delayed on recording, is delayed by one half the horizontal scanning period, thereby restoring to said input composite video signal.

Claim 11

Apparatus for recording/reproducing a composite video signal according to a standard television system with interlaced scanning on and from a rotary recording medium, said apparatus comprising: (a) rotary recording medium driving means for rotating the same at a speed equal to vertical scanning period of said composite video signal; (b) a head for recording/reproducing said composite video signal on and from said rotary recording medium; (c) a head shifting mechanism for moving said head in synchronism with said vertical sanning period; (d) first means responsive to horizontal and vertical sync signals of an input composite video signal to be recorded on said rotary recording medium or horizontal and vertical sync signals synchronized with said horizontal and vertical sync signals for determining whether a present field is an odd field or an even field and producing an output signal indicative of the kind of detected field; (e) second means responsive to said horizontal sync signal and to said output signal from said first means for producing a first control signal for a period of time corresponding to said odd or even field; (f) third means for delaying, by a period equal to one half a horizontal scanning period, only odd or even field signal of said input composite video signal except for a portion around its vertical sync signal in the presence of said first control signal from said second means, thereby producing a modified composite video signal to be recorded on said rotary recording medium; (g) a record circuit responsive to said modified composite video signal for converting same into a signal suitable for recording; (h) fourth means responsive to said horizontal sync signal and to said output signal from said first means for producing a field distinguishing signal indicative of either odd field or even field; (i) fifth means for mixing said field distinguishing signal with said signal from said record circuit so that a superposed signal is fed to said head; (j) a reproduce circuit responsive to a reproduced signal from said head for obtaining a reproduced modified composite video signal which is then fed to said third means; (k) a detecting circuit responsive to said reproduced signal from said reproduce head for detecting said field distinguishing signal; (1) a sixth means responsive to said detecting circuit for producing a second control signal for a predetermined period of time substantially corresponding to even or odd field, said second control signal being fed to said third means in place of said first control signal in reproduce mode where said reproduced modified composited video signal from said reproduce circuit is fed to said third means in place of said input composite video signal so that only even or odd field signal, which has not been delayed on recording, is delayed by one half the horizontal scanning period, thereby restoring to said input composite video signal.

Claim 12

Apparatus for recording/reproducing a composite video signal according to a standard television system with interlaced scanning on and from a rotary recording medium, said apparatus comprising: (a) rotary recording medium driving means for rotating the same at a speed equal to vertical scanning period of said composite video signal; (b) a head for recording/reproducing said composite video signal on and from said rotary recording medium; (c) a head shifting mechanism for moving said head in synchronism with said vertical sanning period; (d) first means responsive to horizontal and vertical sync signals of an input composite video signal to be recorded on said rotary recording medium or horizontal and vertical sync signals synchronized with said horizontal and vertical sync signals for determining whether a present field is an odd field or an even field and producing an output signal indicative of the kind of detected field; (e) second means responsive to said horizontal sync signal and to said output signal from said first means for producing a first control signal for a period of time corresponding to said odd or even field; (f) third means for delaying, by a period equal to one half a horizontal scanning period, only odd or even field signal of said input composite video signal except for a portion around its vertical sync signal in the presence of said first control signal from said second means, thereby producing a modified composite video signal to be recorded on said rotary recording medium; (g) a record circuit responsive to said modified composite video signal for converting same into a signal suitable for recording; (h) fourth means responsive to said horizontal sync signal and to said output signal from said first means for producing a field distinguishing signal indicative of either odd field or even field; (i) fifth means for mixing said field distinguishing signal with said signal from said record circuit so that a superposed signal is fed to said head; (j) a reproduce circuit responsive to a reproduced signal from said head for obtaining a reproduced modified composite video signal which is then fed to said third means; (k) a detecting circuit responsive to said reproduced signal from said reproduce head for detecting said field distinguishing signal; (1) a sixth means responsive to said detecting circuit for producing a second control signal for a predetermined period of time substantially corresponding to even or odd field, said second control signal being fed to said third means in place of said first control signal in reproduce mode where said reproduced modified composited video signal from said reproduce circuit is fed to said third means in place of said input composite video signal so that only even or odd field signal, which has not been delayed on recording, is delayed by one half the horizontal scanning period, thereby restoring to said input composite video signal.

Claim 13

Apparatus for recording a composite video signal comprising: (a) means for producing a recording signal having a signal form suitable for recording and reproducing on the basis of a modified composite video signal arranged such that a signal other than a portion around a vertical sync signal of one of odd field signal and an even field signal of a composite video signal which is an objective of recording and reproducing where horizontal scanning and vertical scanning are performed in accordance with a scanning standard adopting interlaced scanning, is delayed by 1/2 of a horizontal synchronous period relative to the composite video signal of the other field; and (b) means for recording a recording signal produced on the basis of said modified composite video signal and a field distinguishing signal located at a given time position with respect to a predetermined vertical sync signal of each frame in said recording signal onto a rotary recording medium which is rotated at a rotating period equal to the period of vertical scanning of the composite video signal.

Claim 14

Apparatus for recording a composite video signal comprising: (a) means for producing a recording signal having a signal form suitable for recording and reproducing on the basis of a modified composite video signal arranged such that a signal other than a portion around a vertical sync signal of one of odd field signal and an even field signal of a composite video signal which is an objective of recording and reproducing where horizontal scanning and vertical scanning are performed in accordance with a scanning standard adopting interlaced scanning, is delayed by 1/2 of a horizontal synchronous period relative to the composite video signal of the other field; and (b) means for recording a recording signal produced on the basis of said modified composite video signal and a field distinguishing signal located at a given time position with respect to a predetermined vertical sync signal of each frame in said recording signal onto a rotary recording medium which is rotated at a rotating period equal to the period of vertical scanning of the composite video signal.

Claim 15

Apparatus for recording/reproducing a composite video signal as claimed in Claim 10, wherein said field distinguishing signal is located at a time position spaced apart from a time position of a vertical sync signal belonging to a field which is not delayed with respect to the other field signal.

Claim 16

Apparatus for recording/reproducing a composite video signal as claimed in Claim 10, wherein a first field distinguishing signal is located at a predetermined time position spaced apart from the time position of a vertical sync signal belonging to a field which is not delayed with respect to the other field, and a second field distinguishing signal, which is different from said first distinguishing signal, is located at a predetermined time position spaced apart from the time position of a vertical sync signal belonging to a field which is delayed with respect to the other field.

Claim 17

Apparatus for recording/reproducing a'composite video signal comprising: (a) means for producing a recording signal having a signal form suitable for recording and reproducing on the basis of a modified composite video signal arranged such that a signal other than a portion around a vertical sync signal of one of odd field signal and an even field signal of a composite video signal which is an objective of recording and reproducing where horizontal scanning and vertical scanning are performed in accordance with a scanning standard adopting interlaced scanning, is delayed by 1/2 of a horizontal sync period relative to the composite video signal of the other field; (b) means for recording a recording signal produced on the basis of said modified composite video signal and a field distinguishing signal located at a given time position with respect to a predetermined vertical sync signal of each frame in said recording signal onto a rotary recording medium which is rotated at a rotating period equal to the period of vertical scanning of the composite video signal; (c) means for reproducing a reproducing signal corresponding to the recording signal produced on the basis of said modified composite video signal from said rotary recording medium and a reproducing signal corresponding to said field distinguishing signal; and (d) means for obtaining modified composite video signal and field distinguishing signal from said reproducing signal; and means for obtaining the original composive video signal by retarding the field signal, which is not delayed, of the modified composite video signal using the field distinguishing signal by a period of 1/2 of the horizontal sync signal.

Claim 18

Apparatus for recording/reproducing a'composite video signal comprising: (a) means for producing a recording signal having a signal form suitable for recording and reproducing on the basis of a modified composite video signal arranged such that a signal other than a portion around a vertical sync signal of one of odd field signal and an even field signal of a composite video signal which is an objective of recording and reproducing where horizontal scanning and vertical scanning are performed in accordance with a scanning standard adopting interlaced scanning, is delayed by 1/2 of a horizontal sync period relative to the composite video signal of the other field; (b) means for recording a recording signal produced on the basis of said modified composite video signal and a field distinguishing signal located at a given time position with respect to a predetermined vertical sync signal of each frame in said recording signal onto a rotary recording medium which is rotated at a rotating period equal to the period of vertical scanning of the composite video signal; (c) means for reproducing a reproducing signal corresponding to the recording signal produced on the basis of said modified composite video signal from said rotary recording medium and a reproducing signal corresponding to said field distinguishing signal; and (d) means for obtaining modified composite video signal and field distinguishing signal from said reproducing signal; and means for obtaining the original composive video signal by retarding the field signal, which is not delayed, of the modified composite video signal using the field distinguishing signal by a period of 1/2 of the horizontal sync signal.