Patent
Sound recording and reproducing device
TLDR
In this paper, an automatic program searching of an optical musical composition at the time of sound reproducing was achieved by multiplying an ID signal having information such as elapsed time from the head of each musical composition with a sound signal converted into a digital signal with time division.Abstract:
PURPOSE: To attain the automatic program searching of an optical musical composition at the time of sound reproducing by multiplying an ID signal having information such as elapsed time from the head of each musical composition with a sound signal converted into a digital signal with time division CONSTITUTION: As to a clock to be a reference for digital signal processing in a PCM processor, a master clock generated synchronously with the rotational phase of a cylinder is used at the time of normal reproducing, and at the time of rapid searching, a reproducing clock synchronizing with a PCM signal reproduced on the basis of PLL is used during the reproducing period of a PCM signal and a master clock is used in the other period Consequently, high quality of sound reduced at its time axial variation as low as possible can be reproduced at the normal reproducing, and at the rapid searching, an ID signal can be detected even if the frequency of the PCM signal is sharply changed In addition, the incorrect detection of the ID signal can be suppressed by stopping an error correcting function of the PCM processor at the rapid searching Thus, precise and rapid program searching can be attained at the time of sound reproducing COPYRIGHT: (C)1987,JPO&Japioread more
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Patent
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References
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Patent
Digital video tape recorder
TL;DR: In this article, two phase-locked loop circuits including a VCO controlled by a preset control signal in response to the direction and speed of a magnetic tape were designed to attain stable reproducing operation with ease of design and without unlocking.