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System-for-processing-audio-PCM-digital-signals

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System for processing audio PCM digital signals

Details

Inventors: Kageyama, Satoshi; Kojima, Tadashi; Todokoro, Shigeru;
Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Kawasaki, JP)
Primary Examiner: Canney; Vincent P.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier

A processing system for reproduced audio digital signals used in an audio PCM (pulse code modulation) recording/reproducing system using a recording/reproducing apparatus such as a video tape recorder having a dropout-compensation circuit is disclosed. The reproduced signal processing system is connected to receive digital information signals reproduced through the dropout compensation circuit from a recording medium on which audio information signals are recorded in the form of digital data words and includes circuit means for detecting whether a reproduced digital signal is dropout-compensated or not and circuit means for adding an error pointer to a reproduced digital signal which is detected as being dropout-compensated.

DETAILED DESCRIPTION Accordingly, a object of the present invention is to provide a reproduced signal processing system which is used for reproducing an audio information signal recorded on a record medium in the form of digital data words by using an reproduction apparatus having a dropout-compensating circuit, and enables an error correction/revision circuit to properly operate regardless of the dropout-compensation.
The reproduced digital signal processing system according to the invention is characterized by comprising circuit means for detecting whether a digital audio signal reproduced through the dropout-compensation circuit is dropout-compensated or not, and circuit means for adding an error pointer to a reproduced signal detected as being dropout-compensated.
The dropout-compensation is detected in a manner that a reproduced digital signal is delayed by a time substantially equal to a delay time used in the dropout-compensation and then bit patterns of non-delayed and delayed digital signals are compared with each other.
Advantages provided by the present invention reside in that an error correction/revision circuit can properly revise data whose probability of dropout-compensation is great and prevent an erroneous correction of other erroneous data.

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