JPH02292761A - Image reproduction controller - Google Patents

Abstract

PURPOSE:To effectively use an audio recording medium, to shorten the recording time of an image reproduction control signal, to enjoy stereophonic reproduction by applying time sharing recording on the image reproduction control signal and an audio program. CONSTITUTION:A magnetic tape 40 housed in an audio cassette is provided with two tracks 70 and 72, and a first audio program 74 and a control signal 76 are time-sharing recorded on a first track 70, and a second audio program 78 is recorded on a second track 72. Pre-amplifier demodulation circuits 45 and 46 amplify and demodulate the reproducing signals of magnetic head 42 and 44, and the output of the pre-amplifier demodulation circuit 45 is applied on an A/D converter 48 and a control signal detection circuit 50, and that of the pre-amplifier demodulation circuit 46 is applied on an A/D converter 52. Thereby, it is possible to effectively use the recording area of the magnetic tape, and also, to enjoy the sound of stereophonic reproduction in most time since the recording time of the control signal 76 can be shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image reproduction control device, and more specifically, to an image reproduction control device that can control image reproduction by an image reproduction device and supply audio corresponding to the reproduced image. 11? n device.

[Prior Art] A two-track audio tape is used as a configuration for controlling an image playback device that plays back still images recorded on a recording medium such as a still video floppy, and one track receives a playback control signal. A known configuration is known in which one track is recorded with one track, and the other track records audio and other audio signals corresponding to the reproduced image. FIG. 3 shows its configuration block diagram.

In Figure 3, 10 is a still video floppy;
12 is an image reproducing device for reproducing still images recorded on the floppy disk 10, and 14 is a video monitor device. The still video floppy 10 has 50 tracks, and each track can record one field of still image video signals.

A recording format is adopted in which the luminance signal is FM-modulated, the color difference signals R-Y and B-Y are line-sequentially FM-modulated, and they are frequency-multiplexed. 16 is a two-track audio cassette tape, 18 is an audio playback device that plays back the audio signals recorded on the audio cassette tape 16 and the control signals of the image playback device 12, 20 is an audio amplifier, and 22 is a speaker. It is.

Audio signals are recorded on one track of the audio cassette tape 16, and control signals for the image reproducing device 12 are recorded on the other track.

The control signal reproduced by the audio reproduction device 18 is supplied to the image reproduction device 12 via a control line 24. FIG. 4 shows the recording state of the tape 16. That is, 30 is a first track, 32 is a second track, and in the first track 30, a control signal 34 designating the track of the floppy 10 to be played back by the image playback device 12 is provided at various places (of course, depending on the playback timing). In the second track 32, an audio signal of an audio program corresponding to the image reproduction program is recorded.

The operation shown in FIG. 3 will be explained. First, the image reproducing device 12 is powered on and the floppy disk 10 is loaded.

In response to loading of the floppy 10, the image reproducing device 12 reproduces the first image, and the reproduced image is displayed on the video monitor device 1.
4 is displayed. When the audio playback device 18 is powered on and the cassette tape 16 is loaded, playback of the tape 16 is automatically started, and the playback audio signal from the second track is applied to the subwoofer via the amplifier 20, and the first The track playback control signal is supplied to the image playback device 12 via the transfer line 24, and controls image playback by the image playback device 12. In this way, the floppy tape 16 is synchronized with the audio signal recorded on the audio cassette tape 16.
0 recorded image is played back.

[Problems to be Solved by the Invention] However, in the configuration of the conventional example described above, one of the two tracks of the audio cassette tape 16 is dedicated to the control signal 34 for image reproduction. The problem is that it cannot support stereo programs that are widely used. Moreover, the recording time of the control signal 34 for an audio program is generally very short, and therefore most of the first track 30 is a wasted portion where nothing is recorded.

Therefore, an object of the present invention is to provide an image reproduction control device that can also support stereo programs.

[Means for Solving the Problems] An image playback control device according to the present invention includes at least two tracks, and the first track records a first audio program and an image playback control signal in a time-sharing manner. There is a second
The second audio program is recorded on the track of the audio recording medium, and the reproduced image reproduction control signal is applied to the image reproduction apparatus, thereby controlling the reproduction operation of the image reproduction apparatus. An image reproduction control device comprising: a first reproduction means for reproducing the first track of the audio recording medium; a second reproduction means for reproducing the second track; The present invention is characterized in that it includes means for detecting an image reproduction control signal from the reproduction signal of the first reproduction means and replacing the reproduction signal of the first reproduction means with the reproduction signal of the second reproduction means.

[Function] By time-divisionally recording the image playback control signal and the audio program, the audio recording medium can be used effectively, and since the recording time of the image playback control signal is short, the first track is used for most of the time. You can enjoy stereo playback of the first audio program of the track and the second audio program of the second track.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the present invention. 4
0 is a magnetic tape stored in an audio cassette, with two tracks 70 and 72 as shown in Figure 2.
A first audio program 74 and a control signal 76 are time-divisionally recorded on a first track 70, and a second track 70 is equipped with a
2, a second audio program 78 is recorded. 4
2 is a magnetic head for reproducing the first track 70, and 44 is a magnetic head for reproducing the second track 72. The preamp demodulation circuits 45 and 46 amplify and demodulate the reproduced signals from the magnetic heads 42 and 44, and the output of the preamp demodulation circuit 45 is applied to the A/D converter 48 and the control signal detection circuit 50, and the output of the preamp demodulation circuit 45 is applied to the A/D converter 48 and control signal detection circuit 50. The output is applied to an A/D converter 52.

The signal digitized by the A/D converter 48 is stored in the memory 5.
4, read out after a predetermined time, and converted back into an analog signal by the D/A converter 60. Similarly, A/
The digital output of D converter 52 is written to memory 58, read out after a predetermined time, and converted back to an analog signal by D/A converter 62. A/D converters 48, 52,
The memories 54 and 58 and the D/A converters 60 and 62 function as delay circuits for timing adjustment with the time required for the detection operation in the control signal detection circuit 50.

The control signal detection circuit 50 detects the control signal 76 recorded on the first track 70, and the switch control circuit 56 switches the switch 64 according to the detection signal from the control signal detection circuit 50. The output of the D/A converter 60 is connected to the a contact of the switch 64, and the output of the D/A converter 62 is connected to the b contact of the switch 64.
The output of connects. The switch 64 is normally connected to the a contact side, and the reproduced audio signal of the audio program 74 of the first track 70 is supplied to the output terminal 66.

When the control signal detection circuit 50 detects the control signal 76, for a period that covers the recording period of the control signal 76,
The switch control circuit 56 connects the switch 64 to the b contact side. On the other hand, the output terminal 68 is always connected to the second track 7.
A reproduction signal of the audio program 78 of No. 2 is supplied.

The reproduced signals at the output terminals 66 and 68 are amplified by an amplifier and applied to the speaker.

To summarize the above, a stereo playback output consisting of the audio program 74.78 is normally obtained from the output terminals 66, 68, and during the period when the control signal 76 is recorded on the first track 70, the output terminals 66, 68 A reproduction signal of the same audio program 78 is output from. Since the recording period of the control signal 76 is extremely short, stereo sound can be enjoyed most of the time.

In the above embodiment, the A/D converters 48, 52, the memory 54
．． 58 and D/A converters 60 and 62 to adjust the timing of the operations in the control signal detection circuit 50 and the switch control circuit 56. Of course, analog delay means can also be used to adjust the timing of the operations in the control signal detection circuit 50 and switch control circuit 56. Timing adjustments may also be made. Further, although the signal switching is performed at the final output stage, it may be performed at other locations, for example, in the digital signal system.

Note that the image reproducing apparatus targeted by the present invention includes those employing various shapes and recording forms such as magnetic disks, magnetic tapes, optical disks, and magneto-optical disks as recording media.

[Effects of the Invention] As can be easily understood from the above explanation, according to the present invention, the audio program and the control signal are time-divisionally recorded on the same track of the magnetic tape on which the audio signal is recorded. The recording area can be used effectively. Furthermore, since the recording period of the control signal is short, you can enjoy stereo playback audio.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention, FIG. 2 is a recording pattern diagram of a magnetic tape, and FIG. 3 is a configuration block diagram of a conventional image playback control system using a combination of an image playback device and an audio playback device. , FIG. 4 is a recording pattern diagram of the magnetic tape of FIG. 3. 40: Magnetic tape 42.44: Magnetic head 45.4
6: Preamplifier demodulation circuit 50: Control signal detection circuit 5
6: Switch control circuit 64: Switch 66, 68:
Output terminal 70: 1st track 72: 2nd track
74: Audio program 76 2 control signal 78: Audio program Figure 7

Claims (1)

[Claims] It has at least two tracks, the first track records a first audio program and an image playback control signal in a time-sharing manner, and the second track records a second audio program. An image playback control device that controls the playback operation of an image playback device by playing back an audio recording medium and applying a played image playback control signal to the image playback device, the audio recording medium a first reproducing means for reproducing the first track; a second reproducing means for reproducing the second track; detecting an image reproduction control signal from the reproduction signal of the first track; An image reproduction control device comprising: means for replacing the reproduction signal by the reproduction means with the reproduction signal by the second reproduction means.