Video signal recording/reproducing apparatus

A signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum on which a video tape is loaded;
• a rotary drum servo circuit for controlling a phase of rotation of the rotary drum to maintain the phase of rotation at a predetermined target phase;
• recording heads mounted on the rotary drum;
• reproducing heads mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording heads;
• recording signal processing means for recording through the recording heads input video signals having a predetermined signal phase on the video tape loaded on the rotary drum rotating at the predetermined rotational phase of the rotation;
• reproducing signal processing means for demodulating signals reproduced by the reproducing heads to generate reproduced video signals;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto tape;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• memory means for storing a time difference which represents the elapsed time between when the recording heads pass a given location on the video tape and when the reproducing heads pass the given location;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the video tape through the recording signal processing means so that the phase of the synchronous signal extracted by the first synchronous signal extraction means and the phase of the synchronous signal extracted by the second synchronous signal extraction means are maintained in relation to the time difference stored in the memory means;
• wherein the recording phase control means controls the phase of the input video signals recorded on the video tape by controlling the predetermined target phase of the rotation provided to the rotary drum servo circuit.

A video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum on which a video tape is loaded;
• a rotary drum servo circuit for controlling a phase of rotation of the rotary drum to maintain the phase of rotation at a predetermined target phase;
• recording heads mounted on the rotary drum;
• reproducing heads mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording heads;
• recording signal processing means for recording through the recording heads input video signals having a predetermined signal phase on the video tape loaded on the rotary drum rotating at the predetermined rotational phase of the rotation;
• reproducing signal processing means for demodulating signals reproduced by the reproducing heads to generate reproduced video signals;
• switching means for selectively switching the recorded signals to be recorded and the reproduced signals to be supplied to the reproducing signal processing means;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto tape;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• time difference measuring means for measuring the time difference between a synchronous signal of the recorded signals and a synchronous signal of the reproduced video signals;
• memory means for storing the time difference measured by the time difference measuring means;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the video tape through the recording signal processing means so that the phase of the synchronous signal extracted by the first synchronous signal extraction means and the phase of the synchronous signal extracted by the second synchronous signal extraction means are maintained in relation to the time difference stored in the memory means.

A video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum;
• a rotary drum servo circuit for controlling a phase of rotation of the rotary drum to maintain the phase of rotation at a predetermined target phase;
• a recording head for recording input video signals having a predetermined signal phase on a media loaded on the rotary drum rotating at the predetermined phase of the rotation;
• a reproducing head for reproducing recorded video signals mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording head;
• memory means for storing a time difference which represents the elapsed time between when the recording head passes a given location on the media and when the reproducing head passes the given location on the media;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto the media;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• a detector for detecting a phase difference between a phase of the synchronous signal extracted by the first synchronous signal extraction means and a phase of the synchronous signal extracted by the second synchronous signal extraction means;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the media through the recording head to maintain the detected phase difference to be the time difference stored in the memory means so that a phase of the video signals to be newly recorded at locations succeeding an editing point on the media matches with a phase of the video signals previously recorded at locations preceding the editing point on the media, thereby producing a phase continuity in the video signals recorded on the media at the locations preceding and succeeding the editing point.

A video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum;
• a rotary drum servo circuit for controlling a phase of rotation of the rotary drum to maintain the phase of rotation at a predetermined target phase;
• a recording head for recording input video signals having a predetermined signal phase on a media loaded on the rotary drum rotating at the predetermined phase of the rotation;
• a reproducing head for reproducing recorded video signals mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording head;
• memory means for storing a mounting angular difference being provided between the recording head and the reproducing head to the rotation center of the rotary drum;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto the media;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• a detector for detecting a phase difference between a phase of the synchronous signal extracted by the first synchronous signal extraction means and a phase of the synchronous signal extracted by the second synchronous signal extraction means;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the media through the recording head to maintain the detected phase difference to be a time interval corresponding to the mounting angular difference stored in the memory means so that a phase of the video signals to be newly recorded at locations succeeding an editing point on the media matches with a phase of the video signals previously recorded at locations preceding the editing point on the media, thereby producing a phase continuity in the video signals recorded on the media at the locations preceding and succeeding the editing point.

A video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum;
• a rotary drum servo circuit for controlling a phase of rotation of the rotary drum to maintain the phase of rotation at a predetermined target phase;
• a recording head for recording input video signals having a predetermined signal phase on a media loaded on the rotary drum rotating at the predetermined phase of the rotation;
• a reproducing head for reproducing recorded video signals mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording head;
• memory means for storing a mounting angular difference being provided between the recording head and the reproducing head to the rotation center of the rotary drum;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto the media;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• a detector for detecting a phase difference between a phase of the synchronous signal extracted by the first synchronous signal extraction means and a phase of the synchronous signal extracted by the second synchronous signal extraction means;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the media through the recording head to maintain the detected phase difference to be a time interval corresponding to the mounting angular difference stored in the memory means.

A method of controlling a recording phase of video signals in a video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, which records input video signals having a predetermined signal phase on a video tape loaded on a rotary drum through the recording head mounted on the rotary drum, a phase of the rotation of the rotary drum being controlled to be a predetermined target phase by a rotary drum servo circuit, and reproduces the recorded video signals by the reproducing head mounted at a position staggered to a rotating direction of the rotary drum from the recording head, the method comprising:

• a first step of previously storing a time difference representing an elapsed time between when the recording head passes a given location on the video tape and when the reproducing head passes the given location on the video tape;
• a second step of separating synchronous signals from the input video signals;
• a third step of separating synchronous signals from the reproduced video signals;
• a fourth step of detecting a phase difference between a phase of the synchronous signals separated in the second step and a phase of the synchronous signals separated in the third step;
• and
• a fifth step of controlling a phase relation between the phase of the input video signals recorded through the recording head and the phase of the rotation of the rotary drum controlled through the rotary drum servo circuit so that the detected phase difference is maintained to be the time difference stored in the first step.

A method of controlling a recording phase of video signals in a video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, which records input video signals having a predetermined signal phase on a video tape loaded on a rotary drum through the recording head mounted on the rotary drum, a phase of the rotation of the rotary drum being controlled to be a predetermined target phase by a rotary drum servo circuit, and reproduces the recorded video signals by the reproducing head mounted at a position staggered to a rotating direction of the rotary drum from the recording head, the method comprising:

• a first step of previously storing a time difference representing an elapsed time between when the recording head passes a given location on the video tape and when the reproducing head passes the given location on the video tape;
• a second step of separating synchronous signals from the input video signals;
• a third step of separating synchronous signals from the reproduced video signals;
• a fourth step of detecting a phase difference between a phase of the synchronous signals separated in the second step and a phase of the synchronous signals separated in the third step;
• and
• a fifth step of controlling a phase relation between the phase of the input video signals recorded through the recording head and the phase of the rotation of the rotary drum controlled through the rotary drum servo circuit so that the detected phase difference is maintained to be the time difference stored in the first step;
• wherein the fifth step of controlling the phase relation between the phase of the input video signals and the phase of the rotation of the rotary drum is carried out by controlling the predetermined target phase of the rotation provided to the rotary drum servo circuit.

A video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum;
• a rotary drum servo circuit for controlling a phase of rotation of the rotary drum to maintain the phase of rotation at a predetermined target phase;
• a recording head for recording input video signals having a predetermined signal phase on a media loaded on the rotary drum rotating at the predetermined phase of the rotation;
• a reproducing head for reproducing recorded video signals mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording head;
• memory means for storing a time difference which represents the elapsed time between when the recording head passes a given location on the media and when the reproducing head passes the given location on the media;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto the media;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• a detector for detecting a phase difference between a phase of the synchronous signal extracted by the first synchronous signal extraction means and a phase of the synchronous signal extracted by the second synchronous signal extraction means;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the media through the recording head to maintain the detected phase difference to be the time difference stored in the memory means so that a phase of the video signals to be newly recorded at locations succeeding an editing point on the media matches with a phase of the video signals previously recorded at locations preceding the editing point on the media, thereby producing a phase continuity in the video signals recorded on the media at the locations preceding and succeeding the editing point;
• wherein the recording phase control means controls the phase of the input video signals recorded on the video tape by controlling the predetermined target phase of the rotation provided to the rotary drum servo circuit.

A video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum;
• a rotary drum servo circuit for controlling a phase of rotation the rotary drum to maintain the phase of rotation at a predetermined target phase;
• a recording head for recording input video signals having a predetermined signal phase on a media loaded on the rotary drum rotating at the predetermined phase of the rotation;
• a reproducing head for reproducing recorded video signals mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording head;
• memory means for storing a mounting angular difference being provided between the recording head and the reproducing head to the rotation center of the rotary drum;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto the media;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• a detector for detecting a phase difference between a phase of the synchronous signal extracted by the first synchronous signal extraction means and a phase of the synchronous signal extracted by the second synchronous signal extraction means;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the media through the recording head to maintain the detected phase difference to be a time interval corresponding to the mounting angular difference stored in the memory means so that a phase of the video signals to be newly recorded at locations succeeding an editing point on the media matches with a phase of the video signals previously recorded at locations preceding the editing point on the media, thereby producing a phase continuity in the video signals recorded on the media at the locations preceding and succeeding the editing point;
• wherein the recording phase control means controls the phase of the input video signals recorded on the video tape by controlling the predetermined target phase of the rotation provided to the rotary drum servo circuit.

A video signal recording/reproducing apparatus using different heads for recording and reproducing video signals, comprising:

• a rotary drum;
• a rotary drum servo circuit for controlling a phase of rotation of the rotary drum to maintain the phase of rotation at a predetermined target phase;
• a recording head for recording input video signals having a predetermined signal phase on a media loaded on the rotary drum rotating at the predetermined phase of the rotation;
• a reproducing head for reproducing recorded video signals mounted on the rotary drum at a position staggered in the rotating direction of the rotary drum from the recording head;
• memory means for storing a mounting angular difference being provided between the recording head and the reproducing head to the rotation center of the rotary drum;
• first synchronous signal extraction means for extracting a synchronous signal that timing directly indicates the phase of recording signal onto the media;
• second synchronous signal extraction means for extracting a synchronous signal from the reproduced signal;
• a detector for detecting a phase difference between a phase of the synchronous signal extracted by the first synchronous signal extraction means and a phase of the synchronous signal extracted by the second synchronous signal extraction means;
• and
• recording phase control means for controlling the phase of the input video signals recorded on the media through the recording head to maintain the detected phase difference to be a time interval corresponding to the mounting angular difference stored in the memory means;
• wherein the recording phase control means controls the phase of the input video signals recorded on the media by controlling the predetermined target phase of the rotation provided to the rotary drum servo circuit.