Recording and reproducing apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTaketoshi Hibi, Kenji Maeno, Kihei Ido, Ken Onishi, Shinobu Ueda, Akiyoshi Hirano, Keiji Hatanaka, Takashi Shiroshita
Life of this patent
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Abstract
In program retrieval using a magnetic tape in which programs are classified by index signals recorded on the tape, an image at the beginning of each program is displayed in a list on a multi-screen, and a desired program is directly selected using a count value of index signals. In recording, an index signal is recorded at a starting point of recording. When preparing a multi-screen at the time of reproducing, an image reproduced a predetermined time after detection of an index signal is reduced and stored in a memory.
Claims40
A recording and reproducing apparatus provided with a function for recording and reproducing index signals, comprising:
- a memory storing video data;
- memory control means for thinning the video data and writing them in a part of said memory, thereby preparing a multi-screen containing a plurality of video data items;
- correlation detecting means for obtaining a correlation between images from the data stored in said memory and the data of a video signal to be recorded or reproduced;
- and
- control means for performing recording of an index signal and/or storing of the video signal in said memory when the correlation is not more than a specified value.
An apparatus for preparing a multi-screen, comprising:
- a video input,
- a video data head for writing to and reading from a tape,
- a record selecting switch selecting a signal to be recorded from a plurality of recording input signals,
- a recording circuit inputting a signal from said record selecting switch and supplying a record signal to said video data head,
- a reproducing circuit receiving a signal from said video data head and outputting reproduced video data,
- a recording/reproducing switch switching the video data head between said recording circuit and said reproducing circuit,
- a memory receiving reproduced video data from said reproducing circuit,
- a memory controller thinning video data frames in said memory and writing thinned video data frames to said memory to prepare the multi-screen,
- an image correlation circuit correlating video data from said reproducing circuit and video data already stored in said memory, and
- a control unit storing the video data from said reproducing circuit in said memory as part of the multi-screen if said correlation is not more than a predetermined value.
An apparatus for preparing a multi-screen, comprising:
- a video input,
- a video data head for writing to and reading from a tape,
- a record selecting switch selecting a signal to be recorded from a plurality of recording input signals,
- a recording circuit inputting a signal from said record selecting switch and supplying a record signal to said video data head,
- a reproducing circuit receiving a signal from said video data head and outputting reproduced video data,
- a recording/reproducing switch switching the video data head between said recording circuit and said reproducing circuit,
- a memory receiving reproduced video data from said reproducing circuit,
- a memory controller thinning video data frames in said memory and writing thinned video data frames to said memory to prepare the multi-screen, and
- a controller controlling said memory to store video data from said memory input switch each time a specified time period elapses,
- wherein said specified time period is a program length of either a program to be recorded or of a recorded program.
An apparatus for preparing a multi-screen, comprising:
- a video input,
- a video data head for writing to and reading from a tape,
- a record selecting switch selecting a signal to be recorded from a plurality of recording input signals,
- a recording circuit inputting a signal from said record selecting switch and supplying a record signal to said video data head,
- a reproducing circuit receiving a signal from said video data head and outputting reproduced video data,
- a recording/reproducing switch switching the video data head between said recording circuit and said reproducing circuit,
- a memory receiving reproduced video data from said reproducing circuit,
- a memory controller thinning video data frames in said memory and writing thinned video data frames to said memory to prepare the multi-screen,
- a detector detecting whether an audio mode of the video input changes,
- wherein said memory controller writes thinned data frames in said memory when said detector detects a change in the audio mode of the video input.
Dependencies are inferred from the claim text.