Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1995-08-28
1998-02-10
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 8, 360 7308, G11B 509
Patent
active
057175349
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a digital reproducing device which can search indexes of sound to be cut out while performing variable-speed continuous memory reproduction without using an analog recording sound channel and a digital sound editing device using it.
BACKGROUND ART
Among digital sound editing devices (which can be a digital sound recording and reproducing device) which searches indexes of necessary parts from plural music sources (sound signals) and cuts out these searched music sources to edit them into a new music source, the following are known as an editing player:
(1) An editing method that sound indexes are searched using sound reproduced from an analog recording sound channel while performing variable-speed continuous reproduction using a digital sound recording and reproducing device such as a digital audio tape recorder (DAT);
(2) An editing method that a sound memory is mounted on a reproduction system of a digital sound recording and reproducing device and sound indexes are searched with variable-speed sound reproduction only in a range of memory capacity; and
(3) An editing method that sound indexes are searched using sound reproduced from a digital recording sound channel in line with variable-speed continuous reproduction of image signals while performing variable-speed continuous reproduction through a jog dial using a digital recording and reproducing device provided with a DT (dynamic tracking) head.
As for the above editing method (1) that sound indexes are searched through variable-speed continuous memory reproduction using an analog recording sound channel, it requires an analog sound recording and reproducing head besides a digital sound recording and reproducing head and has a drawback that the device becomes complicated and expensive.
As for the editing method (2), the range for variable-speed reproduction is limited by the capacity of memory for sound, and if the memory capacity is increased, it takes time to take in sound data and performance is extremely deteriorated.
The editing method (3) is realized by an embodiment as shown in FIG. 16.
In an editing player 10 shown in FIG. 16, a rotating recording and reproduction part 11, for example, a rotating digital VTR (video tape recorder), and a rotating drum 12 is driven with a magnetic tape 13 wound around it in a helical state. A pinch roller 14 and a capstan 15 are also illustrated in FIG. 16.
According to the speed at which a jog dial 17 is turned, a motor drive circuit 18 is controlled, and the speed of the capstan is controlled. This rotating speed is detected by an FG detection circuit 19 of a capstan motor, and a writing speed of sound data onto a sound buffer memory 23 is controlled based on and synchronously with this rotational frequency.
The FG detection output is counted at an FG counter 21, according to which a write address generation circuit 22 is controlled. The sound data is read and put out of the sound buffer memory 23. As the tape reproducing speed is changed according to the jog dial 17, indexes can be searched at a suitable speed for cutting out sound.
As the capstan motor (not shown) is a mechanical element, a time delay occurs from detection of a speed of turning the jog dial 17 to the time when the capstan motor actually reaches a predetermined speed.
In using the above digital recording and reproducing device for an editing player, image signals are synchronized with sound signals, and as an operator (editor) performs an index search while viewing a reproduced image, the time delay between the speed of turning the jog dial 17 and the variable speed of the sound is not significantly recognized.
In using a digital sound recording and reproducing device for an editing player, however, the time delay between the speed of turning the jog dial 17 to the variable speed of sound gives a sense of incongruity to the operator, which makes the editing method (3) unsatisfactory.
The present invention has solved such a conventional problem and variable-speed reproduction of sound data qu
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Maruyama Yukihiro
Sato Masami
Sekigawa Kaoru
Yahagi Yoshiyuki
Maioli Jay H.
Sniezek Andrew L.
Sony Corporation
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