Playback device
First Claim
1. A playback device comprising:
- a head provided on a rotary drum to read signals recorded on a tape to produce a playback signal;
a playback signal processor for processing the playback signal;
a timing generator for generating a sync signal used in a varied-speed playback in which playback is performed at a speed different from a speed used for normal playback;
a selector for selecting the sync signal between one for the normal playback and one for the varied-speed playback; and
a drum rotation controller using the sync signal generated by said timing generator as a reference signal for the rotation of the rotary drum during varied-speed play back,the sync signal selected by said selector being used for controlling a monitor for displaying the playback signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A playback device has a head provided on a rotary drum to read signals recorded on a tape to produce a playback signal, and a playback signal processor for processing the playback signal. The playback device also includes a timing generator for generating a sync signal used in a varied-speed playback in which playback is performed at a speed different from a speed used for normal playback; a selector for selecting the sync signal between one for the normal playback and one for the varied-speed playback; and a drum rotation controller using the sync signal generated by said timing generator as a reference signal for the rotation of the rotary drum during varied-speed playback. With the above configuration, the vertical and horizontal sync signals supplied to the monitor are maintained to have a constant period. As a result, the resultant images on the monitor are free from disturbances, and it is possible to avoid muting.
-
Citations
9 Claims
-
1. A playback device comprising:
-
a head provided on a rotary drum to read signals recorded on a tape to produce a playback signal; a playback signal processor for processing the playback signal; a timing generator for generating a sync signal used in a varied-speed playback in which playback is performed at a speed different from a speed used for normal playback; a selector for selecting the sync signal between one for the normal playback and one for the varied-speed playback; and a drum rotation controller using the sync signal generated by said timing generator as a reference signal for the rotation of the rotary drum during varied-speed play back, the sync signal selected by said selector being used for controlling a monitor for displaying the playback signal. - View Dependent Claims (2, 3, 4, 9)
-
-
5. A playback device comprising:
-
a head provided on a rotary drum to read signals recorded on a tape to produce a playback signal; a playback signal processor for processing the playback signal; a timing generator for generating a sync signal used in a varied-speed playback in which playback is performed at a speed different from a speed used for normal playback; a selector for selecting the sync signal between one for the normal playback and one for the varied-speed playback; a drum rotation controller using the sync signal generated by said timing generator as a reference signal for the rotation of the rotary drum during varied-speed playback, a memory, a rotation position sensor provided on the rotation part of the rotary drum, and a memory controller for controlling the memory such that the video signal output from the playback signal processor is written into the memory using the output of the rotary position sensor as a timing signal.
-
-
6. A playback device comprising:
-
a head provided on a rotary drum to read signals recorded on a tape to produce a playback signal; a playback signal processor for processing the playback signal; a timing generator for generating a sync signal used in a varied-speed playback in which playback is performed at a speed different from a speed used for normal playback; a selector for selecting the sync signal between one for the normal playback and one for the varied-speed playback; a drum rotation controller using the sync signal generated by said timing generator as a reference signal for the rotation of the rotary drum during varied-speed playback, wherein the playback signal is an interlace signal of which each frame is formed of a first field and a second field, a reading timing adjusting means for varying the timing of the vertical sync signal for the second field relative to the vertical sync signal for the first field so as to make the beginning of a picture information part of the second field to match with the beginning of a picture information part of the first field. - View Dependent Claims (7)
-
-
8. A playback device comprising:
-
a head provided on a rotary drum to read signals recorded on a tape to produce a playback signal; a playback signal processor for processing the playback signal; a timing generator for generating a sync signal used in a varied-speed playback in which playback is performed at a speed different from a speed used for normal playback; a selector for selecting the sync signal between one for the normal playback and one for the varied-speed playback; a drum rotation controller using the sync signal generated by said timing generator as a reference signal for the rotation of the rotary drum during varied-speed playback, means for generating a clock signal which matches with the phase and frequency of the playback horizontal sync signal whose frequency varies with the variation of the speed at which the tape is reproduced, said means for generating the clock signal including; a voltage-controlled oscillator for producing the clock signal; a frequency dividing circuit for frequency-dividing the clock signal output from the voltage-controlled oscillator to produce a second horizontal sync signal; a phase comparator for producing a voltage signal indicating the phase difference between the second horizontal sync signal from the frequency divider and the playback horizontal sync signal; an offset adder for adding an offset to the output of the phase comparator; and means for varying the offset according to the playback speed.
-
Specification