Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-10-31
2001-02-06
Tran, Thai (Department: 2715)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C348S220100
Reexamination Certificate
active
06185362
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a digital camcorder, and more specifically, to a digital camcorder which has an automatic select function for selecting an audio signal output channel. The present invention also relates to a recording/reproducing method of the audio signals. In the recording/reproducing method, a dubbing flag is inserted into a sub-code during a dubbing mode, and the sub-code is read during a playback mode, with a result that the audio signals of a sub-channel are automatically selected and output if a dubbing flag is detected, and the audio signals of a main channel are selected and output when there are no dubbing flags detected. The present invention is based on Korean Application No. 97-2875, which is incorporated herein by reference.
In digital and analog camcorders, audio signals may be recorded on a recording media during a shooting mode and during a dubbing mode. During the shooting mode, video signals are shot and audio signals in the shooting area are recorded at the same time. During the dubbing mode, audio signals, in addition to the audio signals recorded during the shooting mode, are artificially recorded.
There are differences between the tape-recording methods of analog and digital camcorders. That is, in analog camcorders, the audio signals of the shooting scenes are recorded in the audio channel on a recording tape during the shooting mode, and then these audio signals are erased and other audio signals are recorded in the audio channel during the dubbing mode. However, in digital camcorders, there is a main audio channel and a separate sub-audio channel. The main audio channel is the recording channel of the audio signals on the shooting scenes, and the sub-audio channel is the recording channel for additional audio signals such as background music.
Conventional digital camcorders have a disadvantage in that users must manually choose the channels. Moreover, users cannot easily find the exact timing when users play back the audio signals of the main channel recorded when photographing or those of the sub-channel recorded when dubbing, or when users play back the audio signals of the main and sub-channel simultaneously.
SUMMARY OF THE INVENTION
To solve the above problems of the conventional digital camcorders, it is an object of the present invention to provide a digital camcorder which has an automatic select function for automatically selecting an audio signal output channel. After dubbing flags are inserted to a sub-code area during a dubbing mode and the sub-codes are read during a playback mode, the audio signals of a sub-channel are chosen when there are dubbing flags, and the audio signals of a main channel are chosen when there are no dubbing flags.
It is another object of the present invention to provide an audio signal recording method.
It is still another object of the present invention to provide an audio signal playback method.
In order to accomplish the first object of the present invention, there is provided a digital camcorder having an audio signal output channel which records audio signals on shooting scenes and dubs audio signals respectively in a main channel and a sub-channel according to a shooting mode or a dubbing mode during recording, and outputs the audio signals recorded in the main channel and the sub-channel during playback, the digital camcorder comprising an operating portion for applying an operation command of the playback mode or the shooting/dubbing mode; an audio input/output portion for inputting/outputting the audio signals; a channel select portion for selecting a channel for recording audio signals input during recording and a channel for outputting the audio signals during playback; an error correction coding/decoding portion for inserting a dubbing flag according to a dubbing flag insertion command during recording and for detecting the dubbing flag according to a dubbing flag detection command during playback; and a controlling portion for applying the dubbing flag insertion command to the error correction coding/decoding portion during the dubbing mode during recording and for applying the dubbing flag detection command to the error correction coding/decoding portion during playback, according to an operational command supplied by the operating portion, thereby controlling the channel select portion according to the existence of the dubbing flag detected.
Preferably, the dubbing flag is inserted in a sub-code area of a recording tape when the audio signals are recorded in the sub-channel.
Preferably, the controlling portion controls the audio signals recorded in the sub-channel to be output when the dubbing flag is detected during playback and controls the audio signals recorded in the main channel to be output when the dubbing flag is not detected.
To achieve the second object, there is provided method of recording audio signals in a digital camcorder, comprising the steps of (a) determining whether a set recording mode is a dubbing mode or a shooting mode; (b) inserting a dubbing flag and recording the audio signals in a sub-channel if the set recording mode is determined in step (a) to be the dubbing mode; (c) recording the audio signals in the main channel if the set recording mode is determined in the step (a) to be a shooting mode; (d) determining whether the recording is finished; and (e) returning to the step (a) if the recording is not finished, and ending the method if the recording is finished.
To achieve the third object, there is provided a method of playing back audio signals recorded in each channel in a digital camcorder, comprising the steps of (a) determining whether a dubbing flag is detected during playback; (b) outputting audio signals of a sub-channel when the dubbing flag is detected in the step (a) and audio signals of a main channel when the dubbing flag is not detected in the step (a); (c) determining whether the playback is finished; and (d) returning to the step (a) if the playback is not finished, and ending the method if the playback is finished.
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Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tran Thai
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