JPH01271986A - Method for searching track by sound track - Google Patents

Abstract

PURPOSE:To promptly search a track by a voice by continuously projecting a video signal as a still picture, pressing a stop button where the still picture corresponding to an aimed sound signal is projected, and reproducing the aimed voice signal. CONSTITUTION:A magnetic head 2 successively searches from a first track, a control part 11 stores a voice signal a1 of a second track in the memory of a time expanding circuit 6 and detects that the first part of the voice signal a1 is recorded from word information W0=W1 of the second track. Further, the control part 11 detects that word information W3 is '1', returns the magnetic head 2 to the first track, transmits a video signal V through a video signal reproducing processing circuit 12 and a terminal 13 to a television receiver, and projects the still picture on the television receiver. An operator presses a stop button 11b and outputs the voice signal a1 existing in the memory of the time expanding circuit 6 through a terminal 9 to a speaker when the voice signal a1 related to the still picture is the aimed one. Thus, the search can be executed promptly.

Description

[Detailed Description of the Invention] <Industrial Application> The present invention is a method for quickly extracting a desired audio signal from a video floppy on which interrelated video and audio signals are recorded. The present invention relates to a track search method using audio tracks that can be output as audio.

<Prior Art> A video floppy has 52 concentric tracks with a diameter of 47 mm.

And Na50 from &1 track (outermost track)
Video signals and audio signals are recorded on the tracks, &51 is an empty track, and Nα52 is a track for cue signals. Note that the video signal and the audio signal are recorded on separate tracks.

For such video files, video signals and audio signals that are related to each other are paired and recorded or played back at the same time. Audio signals are time-compressed and recorded, and approximately 10 seconds of audio can be recorded on one track.

Here, the recording format of the audio signal will be explained.

As shown in FIG. 4, the audio track of video floppy 1 consists of four sectors #0, #1. #2. #3, and time-compressed audio signals are recorded separately in these sectors. A series of related audio signals (hereinafter referred to as an "audio sequence") is recorded over one track or multiple tracks. Figure 5 shows the audio sequence,
5th track sector #Q# #1t #2 8th track sector #O, #1. #2. @3 groan 11th track Safetabo 0. An example is shown in which data is recorded separately in each sector in the order of $1→sector #0 of the 13th track. When recording an audio sequence on multiple tracks as shown in this example, the multiple tracks do not necessarily have to be adjacent, and it is not necessary to record in all four sectors on each track, but Recording must always start from sector #0. When audio is recorded in this way, the usage of each sector can be divided into the following four types.

Taibuto: Continue recording to the next sector of the same track.

Type 2: Finish recording on that track and continue recording on sector #O of the following track.

Type 3: Recording ends in that sector.

Type 4: Unused sector.

The signal arrangement of the audio signals for the sectors is shown in FIG. Start flag and end flag levels (
The characteristics (high level, low level) are the sector type 1 described above.The control code attached to each sector is the same within the same track. The control code includes nine word information W,, W, in addition to information for synchronization and information for correction of meditation.

・Each word information is composed of 8 bits and has the following meaning.

Wo: Indicates the track number.

Wl: Indicates the track number of the first track among the tracks on which the audio sequence is recorded.

W2: When recording an audio sequence on multiple tracks or racks, this indicates the track number of the subsequent track following the current track. Therefore, this word information has no meaning in a track containing a type 3 sector, ie, a track where the recording of the audio sequence ends.

W3: Indicates the number of the track on which the video signal is recorded when the video signal is recorded as a pair in relation to the audio signal. In the case of field still image recording, the corresponding video track number is shown, and in the case of frame still image recording, the outer video track number is shown.

W4: Not used.

WS: Indicates playback mode, time compression rate and option code.

■, W7. w8: Opinion code, which is also used as a link code for dates, etc.

<Problem to be solved by the invention> When audio signals and video signals are recorded on a video file according to the audio signal recording format described above,
In order to find out what kind of audio information is contained, it was necessary to magnetically reproduce the audio signals from each sector of all the audio tracks and output them as audio. In other words, the magnetically recorded audio signal had to be output as audio from beginning to end, which took a long time.

In view of the above-mentioned prior art, the present invention has been developed to record a plurality of types of audio sequences in pairs with related video signals, in order to confirm what kind of audio sequence is included in each audio sequence. To provide a method for finding the cue of an audio signal by which it is possible to check what kind of audio signal has been recorded by displaying related video signals one after another as still images.

Means for Solving the Problems> The present invention to solve the above problems is such that mutually related video signals and audio signals are recorded on different tracks of a video floppy, and each sector of the track on which the audio signals are recorded is recorded on different tracks of a video floppy. contains word information indicating the track number of the track to which the sector belongs, the track number of the track where the first part of the audio signal is recorded, and the track number of the track where the video signal related to the audio signal is recorded. (il) When searching for a track containing a desired audio signal, an audio track is searched, and when an audio track is detected as a result of the search, the word information indicating the track number and the audio The track where the first part of the audio signal is recorded is searched from the word information indicating the track number where the first part of the signal is recorded, and the audio signal recorded on the searched audio track is temporarily stored. (iii) Next, the track number in which the video signal related to the audio signal recorded in the searched audio track is recorded is searched from the word information, and the video signal is played back from the searched video track as a still image. (iii) If a stop command is input after that,
The audio signal once stored is reproduced and output as audio, and when a stop command is not input, the search proceeds to the next track and performs the search (i).

Example of implementation The method of the present invention will be specifically explained below.

FIG. 1 shows the playback system of a video 4P device. As shown in the figure, the audio signal A reproduced from the video file 1 by the magnetic head 2 is amplified by the reproduction amplifier 3, and
The signal is modulated into FM1 by the M demodulation iIiwj4, de-emphasized by the de-emphasis circuit 5, and time-expanded by the time expansion circuit 6 to become the audio signal a. The time expansion circuit 6 is A
/D converter, memory and D/A converter, audio signal A
9! The read cycle for reading from the memory, converting it from D/A, and outputting an audio signal is longer than the write cycle for A/D converting and writing to the memory. Therefore, for example, if the length of audio signal A is 1 second, the length of audio signal a will be 10 seconds. The audio signal a passes through a noise reduction circuit 7 and a four-pass filter 8 and reaches an audio output terminal 9. A speaker (not shown) is connected to the audio signal terminal 9. The interface circuit 10 extracts the start flag, end flag, and control code from the audio signal A and sends them to the control section 11. The control unit 11 can determine the track on which the magnetic head 2 is located based on a track position signal sent from a head moving mechanism (not shown), and causes the magnetic head 2 to move based on a track feed 9 signal. The control unit 11 also includes a voice search mode button lla and a stop button l.
It is equipped with lb.

On the other hand, the video signal V reproduced from the video 4P 1 by the magnetic head 2 is amplified by the reproduction amplifier 3, and reproduced by the video signal reproduction processing circuit 12 to become the video signal V of the NTSC system. This video signal V reaches the video output terminal 13. A television receiver is connected to this video output terminal 13.

For example, the video floppy 1 is in a state as shown in FIG. The first audio signal a related to the video signal v1 of
1 (audio sequence) is sector #0 of the second track. #
1. #2. $3 and sector #0 of the third track. In #1, a second audio signal a2 (
audio sequence) is sector #0 of the fifth track. $$1
．． The operation when recorded in #2゜#3 is shown in Figures 1~
This will be explained with reference to FIG.

When the audio search mode button 11a of the control unit 11 is pressed, the audio search mode is entered, and the magnetic head 2 starts searching for tracks in order from the first track. Since the video signal v1 is recorded on the first track, the video signal v1 is not reproduced by the video signal reproduction processing circuit 12, that is, the magnetic herad 2 is transferred to the second track without outputting the video signal V.
Transfer to truck.

When the magnetic head 2 moves to the second track, the control unit 11 determines that audio is recorded on this second track based on the signal from the interface MIi10. At this time, information on the audio signal a1 is stored in the memory of the time expansion port Is6. In the word information attached to each sector of the second track, WO (indicating the rack number) is 2, Wl (indicating the first track number of the audio sequence) is 2, and WO=W1. Then, it is detected that the first part of the audio signal a1 is recorded on the second track. Therefore, the control unit 11 determines that the word information W3 attached to each sector of the second track (indicating the track number of the track on which the video signal is recorded in association with the audio signal of the second track) is 1. , return the magnetic head 2 to the first track. As a result, the video signal V reproduced from the first track is reproduced by the video signal reproduction processing circuit 12, and the video signal V is sent to the television receiver via the video output terminal 13, and the still image is displayed on the television receiver. It will be projected. By looking at the displayed still image, the operator can determine whether the audio signal a1 related to this still image is the desired one. When the audio signal is the desired one, press the stop button llb to start the time expansion circuit 6.
The audio signal a1 stored in the memory of is read out,
The signal is sent to the speaker via the audio output terminal 9, and output as audio from the speaker. If it is not the desired audio signal, the magnetic head 2 is sent to the third track under the control of the control section 11 after being left for a certain period of time.

When the magnetic head 3 moves to the third track, the control section 11 determines that audio is recorded on this third track. Third
The word information attached to each sector of the track is WO (indicating the track number) is 3, Wl (indicating the first track number of the audio sequence) is 2, and WO\W
1, and the audio signal a1 is placed on the third track.
It is detected that the first part of is not recorded. Therefore, under the control of the control section 11, the magnetic head 2 is sent to the next track without outputting the audio signal a1 as audio from the third track.

Since the video signal V2 is recorded on the fourth track, the magnetic head 2 is moved to the fifth track without reproducing the video signal v2 and projecting it as a still image.

When the magnetic head 2 moves to the fifth track, the control section 11 determines that audio is recorded on this fifth track. Fifth
The word information attached to each sector of the track is WO (indicating the track number) is 5, Wl (indicating the top track number of the audio sequence) is 5, and WO = W1.
, and it is detected that the first part of the audio signal a2 is recorded on the fifth track. Therefore, the control unit 11 uses word information W3 attached to each sector of the fifth track (indicating the track number of the track on which the video signal is recorded in association with the audio signal of the fifth track).
is determined to be 4, and the magnetic head 2 is returned to the fourth track. As a result, the video signal V reproduced from the fourth track is reproduced by the video signal reproduction processing circuit 12, and the video signal V is sent to the television receiver via the video output terminal 13Ie, and a still image is displayed on the television receiver. It will be done. By looking at the displayed still image, the operator can determine whether the audio signal a2 related to this still image is the desired one. When it is the desired audio signal, press the stop button 11b to read out the audio signal a2 stored in the memory of the time expansion circuit 6, send it to the speaker via the audio output terminal 9, and output the audio from the speaker. is output as If it is not the desired audio signal, the magnetic head 2 is sent to the next track under the control of the control section 11 after being left for a certain period of time.

In the same manner, a still image is displayed up to the 50th rack, and a search is performed using an audio signal.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, a video signal is projected as a still image, and the stop button is pressed when the still image corresponding to the target audio signal is displayed. When pressed, the desired audio signal is played back and output as audio, allowing for quick audio searches.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a playback system of a video floppy device, Fig. 2 is an explanatory diagram showing an example of a signal recording state, and Fig. 3 is an explanatory diagram showing an example of a signal recording state.
Figure 4 is a flowchart showing the operation according to the method of the present invention, Figure 4 is an explanatory diagram showing sector division of Video Fumitsbee, Figure 5 is an explanatory diagram showing an example of the recording state of an audio signal, and Figure 6 is an explanatory diagram showing an example of the recording state of an audio signal. It is an explanatory diagram showing a signal arrangement. In the drawing, 1 is a video floppy, 2 is a magnetic head, and 11 is a control section.

Claims (1)

[Claims] A video signal and an audio signal that are related to each other are recorded on different tracks of a video floppy, and each sector of the track on which the audio signal is recorded has the track number and audio of the track to which that sector belongs. In the case where word information indicating the track number of the track where the first part of the signal is recorded and the track number of the track where the video signal related to the audio signal is recorded, (i) desired audio When searching for a track of signals,
When an audio track is searched and an audio track is detected as a result of the search, the audio is determined based on the word information of the track that indicates the track number and the word information that indicates the track number where the first part of the audio signal is recorded. Search for the track where the first part of the signal is recorded, temporarily store the audio signal recorded on the searched audio track, and (ii) Next, store the audio signal recorded on the searched audio track. The track number in which the related video signal is recorded is searched from the word information, the video signal is reproduced from the searched video track and displayed as a still image, (iii) When a stop command is input after that, the above-mentioned once stored A track search method using an audio track, characterized in that the audio signal is reproduced and output as audio, while when a stop command is not input, the search proceeds to the next track and performs the search in (i) above.