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US 5,319,501 AGranted
Magnetic recording and reproducing apparatus which records analog time-base-compressed audio signals along with video signals
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYasuo Mitsuhashi
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Abstract
In a magnetic recording and reproducing apparatus, audio signals are recorded over a track where video signals have been recorded. The audio signals are subject to time base compression, and are recorded on a magnetic recording medium. The audio signals undergo time base expansion before they are reproduced. When recording television signals from a plurality of channels on one magnetic recording medium or reproducing video signals intermittently, the audio signals are recorded without interruption.
Claims14
A magnetic recording and reproducing apparatus comprising:
- analog-to-digital means for converting audio signals for a plurality of different channels into digital data, said different channels having timing offset from each other;
- memory means for storing data outputted from said analog-to-digital means so as to synchronize the digital data for a plurality of different channels;
- time base compressing means for compressing a time base of the data stored in said memory means and for outputting time-base-compressed data;
- digital-to-analog converter means for converting the time-base-compressed data outputted from said time base compressing means into analog signals and for outputting analog time-base-compressed audio signals;
- an audio signal recorder for recording the analog time-base-compressed audio signals at a first layer of a magnetic recording medium so that audio signals for a plurality of different channels being produced simultaneously can be subsequently reproduced continuously to produce sounds without interruption;
- and
- a video signal recorder for superimposing video signals from different channels being produced at different timings for each channel at a second layer of the magnetic recording medium, said second layer being over the first layer where the analog time-base-compressed audio signals have been recorded, thereby providing recording of two simultaneously broadcasted programs on the same magnetic recording medium.
4 more elements
A magnetic recording and reproducing apparatus comprising:
- input means for inputting television signals including audio signals and video signals for a plurality of different channels;
- first analog-to-digital converter means for converting the video signals inputted from said input means into video digital data and for outputting the video digital data;
- second analog-to-digital converter means for converting the audio signals inputted respectively from said input means into audio digital data;
- memory means for storing the video digital data outputted from said first analog-to-digital converter means and the audio digital data outputted from said second analog-to-digital converter means, said memory means including a first memory for storing and synchronizing respective channels of the video digital data and a second memory for storing and synchronizing respective channels of the audio digital data;
- first digital-to-analog converter means for converting the video digital data stored in said memory means into video analog signals and for outputting the video analog signals;
- time base compressing means for compressing a time base of the audio digital data stored in said memory means and for outputting time-base-compressed data;
- second digital-to-analog converter means for converting data outputted from said time base compressor means into audio analog signals and for outputting the audio analog signals as analog time-base-compressed audio signals;
- audio data supply control means for controlling the timing for said time base compressor means to supply the time-based-compressed data to said second digital-to-analog converter means so that data corresponding to the audio and video signals inputted from said input means are incorporated alternately into the time-base-compressed audio analog signals outputted from said second digital-to-analog converter means;
- an audio signal recorder for recording the analog time-base-compressed audio signals at a first layer of a magnetic recording medium so that audio signals for a plurality of different channels can be subsequently reproduced to produce audio signals without interruption;
- a video signal recorder for superimposing video signals from said first digital-to-analog converter means and one video signal not inputted to said first analog-to-digital converter means at a second layer of the magnetic recording medium, said second layer being over said first layer of the magnetic recording medium;
- and
- video signal supply control means for supplying video signals from different channels alternately at a predetermined timing so as to have video signals from different channels recorded by said video signal recorder.
9 more elements
Dependencies are inferred from the claim text.