JPH0732476B2 - Still image playback device - 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 relates to a still image reproducing device.

[Outline of Invention]

In searching for a still picture recorded on a concentric circular track of a rotary recording medium, the still image reproducing apparatus of the present invention first stores in memory a sound signal recorded on another track corresponding to the still picture. Then, while reproducing the still picture, the audio signal taken into the memory is read out at a cycle earlier than the normal clock cycle. Therefore, an audio signal corresponding to a still image can be output even when performing a high speed search.

[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.

By the way, when adding an audio signal to a still picture,
For example, as shown in FIG. 4, video tracks V ₁ , V ₂ , V ₃
On the other hand, if audio signals A ₁ , A ₂ , A ₃ ... are recorded on different tracks and these are played back according to the programmed sequence, the audio signals are added to the still picture and viewed on a monitor TV etc. Will be able to.

[Problems to be solved by the invention]

However, when the video signal and the audio signal are recorded by such a method, there is a problem that a silent state occurs when searching only a still image, for example.

The still picture disc high-speed search system of the present invention provides a system in which an audio signal is output for a still picture being searched.

[Means for solving problems]

According to the still image high-speed search method of the present invention, time axis compression processing is performed when an audio signal is recorded, and at least head data capable of designating a track on which a still image corresponding to the audio signal is recorded is provided. Add and record.

[Action]

Since the video track number of the corresponding still picture is added as head data to the audio signal that is time-axis compressed and recorded, the digital signal processing circuit that expands the audio signal when reading in the normal playback state You can switch to high-speed search mode simply by increasing the clock cycle.
At the same time, the audio signal can be output.

〔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 the operation panel surface, 11 is a floppy disk loading opening, and 12 is a button for selecting the audio compression ratio, for example, the time of the recorded audio signal for one track can be selected. Is. Reference numeral 13 denotes a button operated during voice recording, for example, start, pause,
It consists of 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 the 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).

Reference numeral 19 is an operation button for rewriting (rewriting), 20 is an operation button used when dubbing a reproduction screen by an external recording / reproducing apparatus, 21A and 21B are operation buttons for advancing still images, and 22 is still reproduction. Button, 23 is a voice play button,
Reference numeral 24 denotes a high-speed search button 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 the decoder that performs Y / C separation of the composite video signal and performs signal processing, 42 is the 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. The digital signal is compressed on the time axis in the digital processing circuit 46 and is supplied via the pre-emphasis 47, and at the same time, the control signal output from the CPU 30, the track number data, etc. are also output via the control signal generation circuit 48 and the pulse modulator 49. It is designed to be added.

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.

In addition, the reproduced audio signal is extracted with the control signal, the track number data and the like contained therein, and is transmitted via the control signal forming circuit 54 and the RF detection circuit 55 to the CPU 30.
Is taken into.

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. The audio signal corresponding to can also be recorded on another recording track by time axis compression.

In this case, at the start portion of the audio signal, the track number in which the still image corresponding to the audio signal is recorded, the control signal (the track number, the compression ratio, and other control signals), the sequence number, etc. It is added as head data.

Then, when the disc is loaded into the device, first, this head data is taken into the index table of the CPU 30, and is reproduced, recorded, and
Controlled to other modes.

The main operation examples will be briefly described below.

In the case of normal reproduction, reproduction is started from the beginning of a sequence consisting of a still picture and an audio signal specifying the recording track number of the still picture.

That is, the head data is read from the audio track corresponding to the No. 1 still image, and the audio signal compressed on the time axis is subsequently taken into the memory of the digital processing circuit of the reproducing circuit. Then, the still picture reproduction state is set based on the head data, and the time-axis expanded audio signal is read from the memory. After reading from this memory,
Next, the head moves to the audio track corresponding to the No. 2 still image, and the No. 2 still image and the audio signal are reproduced in the same manner. However, when the frame feed buttons 21A and 21B are operated, the program is shifted to the next program, and the normal playback is resumed on the shifted track.

When the still button is pressed, the frame advance mode is set, and at this time also only the still image is reproduced according to the sequence recorded in the audio track.

Further, when the play button of the voice is pressed in the still mode, the voice corresponding to the still picture can be output.

When the recording mode is set, the input video signal is directly output to the monitor. When video recording is pressed in this state, a video signal for one frame is recorded on an empty track of the disc.

A video signal is recorded on the disc by performing video recording when both recording and reproduction are pressed, and thereafter, the reproduction state of the recorded video can be restored.

As described above, in the still picture recording / reproducing system targeted by the present invention, the audio signal corresponding to the still picture is
First, in the digital signal processing circuit 46, when compressed on the time axis, when recording on an audio track, the number of the track on which the still image corresponding to the audio signal is recorded, the control signal, and the part following the audio signal. If there is, the number or the like of the track on which the audio signal is recorded is added to the audio signal as head data.

Therefore, in a normal reproduction state, first, head data is taken into the CPU 30 from the audio track, and the recorded audio signal is stored in the memory (RAM) of the digital signal processing of the reproduction circuit.

Then, the still picture of the video track designated by the head data is reproduced, and at the same time, the audio signal stored in the memory (RAM) is read out while being expanded.

Therefore, the still picture is displayed at least until the time when all the audio signals are output. In the case of standard reproduction, when the audio signal ends, the next still picture reproduction sequence starts, and the sequential still picture is displayed on the monitor TV or the like. Will be output to.

In such a standard reproduction mode, the high speed search button 24 is pressed. As shown in the flow chart of FIG. 3, the read clock cycle Ts (standard mode) of the memory (RAM) is 1
/ n times can be switched.

That is, in the high speed search mode, first, it is determined that the reproduction state is set (101), and then the read cycle Ts of the memory (RAM) is switched to Ts / n (102).

Then, when the video is not being reproduced (103), that is, when the head is located on the audio track, after writing to the memory (RAM) is completed (104), the head is moved to the track where the still image corresponding to the audio information is recorded. The audio signal is read from the memory (RAM) at the Ts / n clock cycle (106) at the same time when the still image is played back (105). Therefore,
A still image and an n times speed audio signal are output (107). Thus, when the audio signal ends (108), it moves to the next audio track (109) and again the same sequence (109).
Still images and audio signals are continuously output at (110), (111), (112), and (113).

When the audio signal is reproduced in the still mode (103) ', the read clock cycle of the memory (RAM) being reproduced is set to Ts / n (106), and the still image and the audio signal are simultaneously output.

When the still picture is already reproduced, the head is moved to the next audio track (109) and the high speed search sequences (109) to (113) are executed.

As described above, in the still image reproducing apparatus of the present invention, the search speed is determined by how many times the read clock frequency in the standard reproduction is multiplied, and when it is necessary to distinguish the audio signals to some extent, n = 2 to n = 2. It is preferably three times.

〔The invention's effect〕

As described above, the still image reproducing device of the present invention is
Since a high-speed search is realized by increasing the read clock frequency of the audio signal,
There is an effect that the switching operation and the circuit are simplified, and the audio signal can be added even during the high speed search.

[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 an object of the present invention, FIG. 2 is a block diagram of an apparatus which can be adopted in a high speed search system of the present invention, and FIG. FIG. 4 is a flowchart showing the operation, and is an explanatory diagram of the video track Vn and the audio track An recorded on the 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. A still picture having a plurality of annular recording tracks, a still picture is recorded on a desired recording track, and a time-axis-compressed audio signal corresponding to the still picture is recorded on a corresponding track. In a still image reproducing device for reproducing the still image and the audio signal from a rotary recording medium,
When the still image reproducing apparatus is in the high-speed search mode, first the information reading means is moved to the audio track, the head data and the audio signal recorded on the audio track are read and then input to the recording memory, A still image including a control unit that moves the information reading unit to a video track and reads an audio signal from the recording memory at a cycle shorter than a normal read clock while reproducing the video signal of the video track. Playback device.