Recording/reproducing system
AssigneeKokusai Gijutsu Kaihatsu Kabushiki Kaisha
InventorsShunsaku Nakauchi, Fumio Watase
Life of this patent
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Abstract
In the case that an analog signal is recorded or reproduced by using a sensor and recording medium relatively moving against the sensor, a sampling signal is generated which is adapted to have a frequency thereof deviated dependently upon an amount of wow and flutter caused by fluctuations in the speed of the relative motion therebetween. A reproduced signal is sampled by means of the sampling signal and, a sampled signal is stored in a memory. After this, a stored contents in the memory are read out by using a reading signal with a predetermined frequency, thereby to remove from the reproduced signal varying frequency components caused by the wow and flutter.
Claims5
A method for reproducing a signal of the type containing an analog signal and a reference signal superposed thereon from a recording medium which moves relative to a sensor, comprising the steps of:
- sampling said analog signal from said sensor to produce samples at a first rate determined by said reference signal from said sensor;
- storing said samples in a memory at said first rate;
- reading out said samples from said memory at a fixed predetermined frequency;
- converting said samples read out from said memory into a continuous analog signal;
- monitoring the number of said samples contained in said memory;
- and
- controlling the speed of motion of said recording medium relative to said sensor in a manner effective to maintain said number of samples contained in said memory at a predetermined amount.
A method for discontinuously recording a continuous signal of the type containing an analog signal and a reference signal having a first fixed frequency superposed thereon on a recording medium which moves relative to a recording device, comprising:
- sampling said continuous signal at a second frequency to produce discrete samples thereof;
- said second frequency being at least twice said first frequency;
- storing said discrete samples in a memory;
- reading out said discrete samples in a first period at a third frequency substantially higher than said second frequency;
- halting said reading out between an end of a preceding first period and a beginning of a following first period;
- converting said discrete samples into a second signal occurring discontinuously;
- and
- recording said second signal by said recording device on said recording medium.
A method for reproducing a continuous signal which has been discontinuously recorded during a plurality of first periods separated by second periods on a recording medium which moves with respect to a sensor, said continuous signal containing an analog signal having a reference signal superposed thereon, comprising the steps of:
- sampling the discontinuously recorded signal at a first frequency to produce discrete samples;
- said first frequency being related to said reference signal reproduced by said sensor;
- storing said discrete samples in a memory;
- reading out said samples from said memory at a fixed predetermined second frequency;
- said second frequency being related to said first frequency such that said samples read out from said memory do not contain gaps;
- and
- converting said samples read out from said memory into a converted continuous signal.
Dependencies are inferred from the claim text.