Apparatus for monitoring reproduced audio signals during fast playback operation
AssigneeVictor Company of Japan, Ltd.
InventorMasatsugu Kitamura
Life of this patent
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Abstract
Apparatus for monitoring reproduced audio signals during fast playback operation comprises a bucket-brigade device for storing pieces of audio information reproduced from a recording medium at a high speed. The stored pieces of information are read out in a sequence at a slower speed than they were stored when the magnitude of the reproduced audio signal exceeds a predetermined value so that the audio information will be restored to the original pitch to be monitored. The interval for which an audio signal is stored in the bucket-brigade device may be controlled in accordance with the speed of the recording medium.
Claims15
Apparatus for monitoring reproduced audio signals during fast playback operation, comprising:
- (a) a first pulse generator for producing a first pulse train signal;
- (b) a level detecting circuit responsive to a reproduced audio signal for producing an output signal when the magnitude of said reproduced audio signal exceeds a predetermined value;
- (c) a memory circuit for storing pieces of said reproduced audio signal in a sequence in response to said first pulse train signal;
- (d) a second pulse generator for producing a second pulse train signal the frequency of which is much lower than that of said first pulse train signal;
- (e) a switching circuit for selectively supplying said memory circuit with one of said first and second pulse train signals;
- (f) a control circuit responsive to said output signal of said level detecting circuit for controlling said switching circuit, said switching circuit being controlled to supply said memory circuit with said second pulse train signal upon presence of said output signal of said level detecting circuit so that said pieces of information prestored in said memory circuit are read out at a normal pitch.
A method of monitoring reproduced audio signals during fast playback operation, comprising the steps of:
- (a) reproducing an audio signal from a recording medium at a speed higher than it was recorded;
- (b) detecting the magnitude of the reproduced audio signal;
- (c) producing a first pulse train signal;
- (d) storing said audio signal in a memory circuit in accordance with said first pulse train signal;
- (e) producing a second pulse train singal having a frequency higher than that of said first pulse train signal;
- (f) supplying said memory circuit with said second pulse train signal when the magnitude of said reproduced audio signal is detected to be above a predetermined value, for reading out the audio signal prestored in said memory circuit at a normal pitch.
Dependencies are inferred from the claim text.