JPH07123297B2 - Audio recording method for still picture disks - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image recording / reproducing apparatus capable of recording or reproducing a still image, an audio signal or the like on a rotary recording medium such as a floppy disk. In particular, the present invention provides a voice recording method for adding voice to still images.

[Outline of Invention]

The audio recording system in the still picture disc of the present invention is
When adding an audio signal to a still image that has already been recorded on concentric tracks on a rotating recording medium, input the audio signal that should be recorded during playback when the still image is output to a monitor, etc. While compressing the audio signal on the time axis, a free track number for recording this audio signal was searched for, and at the same time, the time signal was compressed along with the control signal at the time of compressing and expanding the audio signal and the video track number during still image reproduction. The audio signal is recorded in the searched empty track.

Therefore, the after recording operation becomes extremely easy.

[Conventional technology]

Techniques have been developed for recording several tens of still images on a small-diameter rotating recording medium such as a compact disc or a floppy disc.

Such a recording / reproducing system is designed so that an arbitrary still picture can be reproduced by recording a video signal for one screen on a concentric recording track and searching for the track number as seen in a recording medium of an electronic camera. ing.

In this case, when adding an audio signal to a still picture,
As shown in FIG. 4, the video tracks V ₁ , V ₂ , V ₃ of the disk D are shown.
It is conceivable to record the audio signals A ₁ , A ₂ , A ₃ ... on different tracks for ....

Then, if the audio signal recorded on this audio track is reproduced and stored in a memory or the like, and then the audio signal reproduced from the video track is simultaneously read out from the memory while outputting the still image reproduced from the video track, the audio will be recorded on the still image. You can add a signal and watch it on a monitor TV.

[Problems to be solved by the invention]

However, in this method, no information about the audio track is recorded in the video track, so, for example, when adding an audio signal to a still picture that has already been recorded (after-recording), Since it is necessary to provide a directory for the tracks in the apparatus and specify the video track number of the screen for post-recording from the outside, there is a problem that the circuit configuration becomes complicated and the operability of the apparatus deteriorates.

The present invention has been made in view of the above problems, and provides a voice recording method for a still picture disc, which enables easy recording of a still picture audio signal for the still picture later.

[Means for solving problems]

According to the audio recording system of the present invention, when a sound signal is added to a specific still image, the reproduction mode is first set, and then the still image is output to a monitor TV or the like, and the audio information is input. It

[Action]

When the audio recording mode is set in the still image playback state, the track (usually an empty channel) in which audio is to be recorded is determined in the device, and the input audio signal is compressed on the time axis to save memory etc. Read.

Then, after that, the video track number being reproduced, the time-axis compression information (control signal) of the audio signal and the like are added as head data of the audio signal to be recorded and recorded in the searched empty track.

When it is determined that the audio input exceeds the accommodation time of one track, the subsequent audio recording track number is programmed to be added to the head data.

Therefore, the after-recording operation can be performed while watching the still image being reproduced, and the operation can be simplified.

〔Example〕

First, the outline of the image recording / reproducing apparatus of the present invention will be described with reference to FIG.

In this figure, 10 is an operation panel surface, 11 is a loading opening of a floppy disk, and 12 is a button for selecting an audio compression ratio. For example, the time of an audio signal recorded for one track can be selected. It is the one.

Reference numeral 13 denotes a button operated during voice recording, and is composed of, for example, a start button, a pause button, and an end button. Reference numeral 14 is an indicator for instructing a sound recording (playback) level, and 15 is an eject button of the disc.

Reference numeral 16 denotes an operation button for selecting the device in the reproduction mode or the recording mode, and 17 denotes a video signal recording button, which can be selected so that recording can be performed in the frame unit FLM and the field unit FLD.

Reference numeral 18 denotes an erasing button, which allows selection of erasing the entire recording surface of the disc (ALLER) and erasing only one screen (during playback) (ERASE).

19 is an operation button for rewriting (rewriting), and 20 is an operation button used when dubbing a playback screen with an external recording / playback device.

Reference numerals 21A and 21B denote operation buttons for frame advance of still images, 22 still reproduction buttons, 23 audio play buttons, and 24 high-speed search buttons for continuously searching still images.

FIG. 2 shows an outline of a block diagram of such a recording / reproducing apparatus. Reference numeral 30 is a central processing circuit (CPU) that controls the operation of the apparatus, 31 is an input operation button device, and 32 and 33 are floppy disks. A spindle motor rotating the floppy disk, 34 a spindle servo circuit, 35 a recording / reproducing head, and the recording / reproducing head 35 is a CPU 30.
Is controlled by the head access driver 36 for traversing the floppy disk 32 in the radial direction.

The part 40 surrounded by the one-dot chain line shows the input circuit of the recording signal, 41 is a decoder that performs Y / C separation of the composite video signal and performs signal processing, 42 is a modulator, FM modulated video The signal is input to the next recording amplifier 43.

The audio signal output from the NR circuit 45 connected to the microphone amplifier 44 or the audio input line terminal is composed of an A / D converter, a memory (RAM), and a D / A converter. At the same time as being compressed on the time axis in the digital processing circuit 46 and supplied through the pre-emphasis 47, the control signal and the track number data output from the CPU 30 are also added through the control signal generation circuit 48 and the pulse modulator 49. It is designed to be done.

Fifty parts of the chain line shows the output signal circuit and is reproduced
The RF signal is converted into a composite video signal via the reproduction amplifier 51, the demodulator 52, and the encoder 53.

A control signal, track number data, and the like included in the reproduced audio signal are pushed out, and are taken into the CPU 30 via the controller signal forming circuit 54 and the RF detection circuit 55.

Further, the demodulated voice signal is converted into a normal voice pitch by the digital processing circuit 58 which extends the time axis through the de-emphasis 57, and is output through the NR circuit 59.

Incidentally, 60 is a memory (RAM) of the digital processing circuits 46 and 58.
2 shows a memory control circuit for setting the compression ratio (expansion ratio) and controlling the timing of writing and reading.

The apparatus to which the present invention is applied is the still picture recording / reproducing apparatus as described above, and the still picture can be recorded or reproduced on one track of the disc by the operation button of FIG. An audio signal corresponding to an image can also be recorded on another recording track by time axis compression.

In this case, at the start portion of the audio signal, as shown in a flowchart described later, a track number in which a still image corresponding to the audio signal is recorded, and a control signal (the track number, compression ratio, other control signal),
And sequential numbers are added as head data.

Then, when such a head data is loaded into the device, the head data is first transferred to the CP.
It is taken into the index table of U30. Then, the operation buttons control playback, recording, and other modes.

The main operation examples will be briefly described below.

When the power is turned on, the reproduction mode is set by default, and when the disc is inserted, standard reproduction is performed from the beginning of the sequence based on the head data obtained by the track search described above.

That is, the head data is read from the audio track corresponding to the No. 1 still picture, and the time-axis-compressed audio signal is subsequently taken into the memory of the digital processing circuit of the reproduction circuit. Then, the No. 1 still picture reproduction state is set based on the head data, and the time-axis expanded audio signal is read from the memory.

When the reading from this memory is completed, the head next moves to the audio track corresponding to the No. 2 still image, and similarly the No. 2 still image and the audio signal are reproduced.

However, when the still image reproduction button 22 is pressed, frame-by-frame reproduction is performed.

When the frame advance buttons 21A and 21B are operated, the frame moves to the audio track corresponding to the video of the next (previous) sequence, the still image and the audio signal are reproduced in the same manner as described above, and the normal reproduction is resumed. .

It should be noted that when the still picture reproduction is being performed by pressing the still picture reproduction button, the audio play button 23 can be pressed to output the sound corresponding to the still picture.

When the recording mode is set by the recording button of the operation button 16,
The input video signal'is output through to the monitor. And if you press the video recording button 17 in this state,
A video signal for one frame (one field) is recorded on an empty track of the disc.

When both recording and reproduction of the operation button 16 are pressed, the video signal is recorded on the disc by performing the above-mentioned video recording, and then the reproduction state of the video just recorded can be automatically returned. .

The audio recording method of the present invention is characterized especially when audio recording is performed in the above-described recording mode and reproduction mode.

As shown in the flowchart of FIG. 3, when the start button of the audio recording of the operation buttons 13 is pressed, the audio recording mode is set, and at this time, the apparatus is in the recording mode after recording the video signal, for example. In this case, first, the CPU 30 designates a voice recording track such as No. (i) (10
1) Next, the audio compression ratio is read to determine the time T _C during which sound can be picked up on one track, and the sound input signal is picked up (102).

When the audio recording signal becomes longer than the sound collection time T _C , the recording track, for example, No. (i + 1) is determined next, and the audio signal compressed on the time axis is recorded. For the data, the control code, the video track number recorded before entering this audio recording mode, the number of the audio recording track for recording the audio signal, etc. are determined (104), and those data are recorded as head data together with the audio signal. Be done (105).

In this way, when the recording of this audio recording track is completed and the audio recording is further continued, the audio signal of the time-axis-compressed memory is subsequently recorded in the next specified audio track. At this time, the control code, the recorded video track number, the next audio recording track number, etc. are added as head data (102 to 10).
Five).

However, when the recording interruption (pause) button of the operation button 13 is pressed, the pause routine (not shown) is entered, and the sound pickup operation (time axis compression) is stopped.

When the recording end button (end) of the operation button 13 is pressed, the end routine of FIG. 3 is entered, and the head feed (301) and voice recording (302) are executed, and the head data includes various control data described above. The end information is input to the outside of, and the process moves to still image reproduction (303) (304).

By the way, in the case of the audio recording method of the present invention, when the apparatus is in the reproduction mode even in the audio recording mode, it is determined whether or not the still image reproduction is performed in the flow on the left side of FIG. 3 ( 201). And for still picture playback,
In order to record the sound corresponding to the still picture being reproduced, the after-recording state (after-recording mode) is set.

As shown in the flow chart of FIG. 3, if the playback mode is set when the start button for audio recording is pressed, it is first determined whether or not still image playback is performed (201). A vacant audio track in the disc, for example No. (i), is determined (202), and the audio compression ratio is read in the same manner as the audio recording in the previous recording mode, and the time T _C picked up on one track is set. After the determination, collection of compressed voice is started (203). During this period, it is judged whether the sound collection time is larger or smaller than T _C (204), and when the sound collection time becomes long, the sound track to be recorded next is determined (205), and sound recording is performed. However, the compressed audio signal for such recording includes the number of the audio track, a control signal (control code) for performing audio compression / expansion, and the video track number for still image reproduction, and the following. Head data consisting of the track number of the audio signal recorded by
6).

When the recording of this audio track is completed, the head is returned to the video track of the still picture (207), and when the still picture is reproduced again, if there is remaining audio information, the recording is continued following the previously specified audio track. (203) ~ (20
Return to 4).

When the pause-on signal comes after the start of the sound collection, the above-mentioned audio recording state is entered even if the sound collection time is shorter than T _C , and then the reproduction still operation is started.

If the end button is pressed, the mode is changed, or the eject operation is performed during the voice recording, the voice recording mode is exited and the end routine of FIG. 3 is started.

Although details of voice recording in the rewrite mode (rewriting) are omitted, in this case, a table of voice tracks to be rewritten is created, and voice is erased and recorded based on this table.

Further, by adding a digital signal processing circuit 46 for recording audio, it is possible to record audio in real time while continuously reproducing still images.

〔The invention's effect〕

As described above, according to the audio recording method of the still picture disc of the present invention, when performing after-recording in which an audio signal is added later to the still picture, the still picture is first reproduced to be displayed on the monitor TV or the like. Since the audio information can be added to the still image by projecting the image and inputting a desired audio signal, the after-recording operation can be performed very easily.

In particular, even in the case of after-recording continuously for a plurality of still images, it is sufficient to operate the audio recording start button in the playback mode and switch the still images to input the audio signal at that timing. There is an advantage that the response of can be performed in real time.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an operation surface of a still picture recording / reproducing apparatus which is a subject of the present invention, FIG. 2 is a block diagram of an apparatus which can be adopted in an audio recording system of the present invention, and FIG. 3 is an audio recording mode. Flow chart showing the operation of the apparatus in
The figure is an illustration of a video track V _n and an audio track A _n recorded on a disc. In the figure, 30 is a CPU, 31 is an input operation button device, 32 is a floppy disk, 35 is a recording / playback head, and 46 is a digital processing circuit for compressing the time axis of an audio signal.

Claims (1)

[Claims] 1. An image recording / reproducing apparatus capable of recording still picture information on a rotary recording medium in an annular track and reproducing desired still picture information recorded on the rotary recording medium. When the audio recording mode for recording an audio signal is specified by a predetermined operation during playback of the still image information recorded on the recording medium, the recording time of the input audio signal is calculated and compressed on the time axis. Audio data is stored, a free track number for recording the audio data is searched, and still image information being reproduced is recorded for the audio data compressed on the time axis. If the track number code, the control signal of the compressed audio data, and the recording time exceeds a predetermined time, the remaining audio data is recorded. A voice recording system for a still picture disc, wherein a track number code is added and recorded on a track corresponding to the searched empty track number together with the compressed audio data.