JPH02193474A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To reproduce an audio signal even if link information is lost by dividing one track into plural sectors, adding a flag and the link information to each sector and executing sound recording. CONSTITUTION:In 2-4 sectors in one track, as the result of an error detection by a CRC code, when there is no error in a control code CTC and the corresponding video track numbers shown by the control code CTC in which there is no error are equal, it is decided that its track is one sound completed by itself. Subsequently, link information shown by a start flag STF and an end flat ENF is disregarded, and reproduction is started from the sector #0. In such a manner, even if there is a defect in a disk area where the flag of an audio track or a control code is recorded, when an audio signal brought to time compression is complete, the reproduction is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc playback device that plays back a disc on which audio signals are recorded as well as still image video signals.

(Summary of the Invention) The present invention provides a disc playback device that plays back a disc on which a time-compressed audio signal is recorded together with a still image video signal, in which the time-compressed audio signal is recorded by dividing one track into a plurality of sectors. At the same time, flags and connection information are added to each sector.
Error detection means for detecting errors in concatenated information added to each sector, means for collating corresponding video tracks from control data added to each sector, and means for detecting sector type from flags inserted in each sector. and using the error detection result information detected by the error detection means, the corresponding video track information matched by the corresponding video track matching means, and the sector type information detected by the sector type detection means. By forming a directory using the information, it is possible to reproduce the audio signal even if there is a defect in the track in which the flag or link information is recorded.

[Conventional technology]

2. Description of the Related Art Electronic still cameras are known in which a camera body and a playback adapter are configured separately.

In such an electronic still camera, a magnetic disk is attached to the camera body, and a still image video signal captured by an image sensor of the camera body is recorded on this magnetic disk.

During playback, the camera body and the playback adapter are connected, and the still image video signal recorded on the magnetic disk of the camera body is played back by the playback circuit provided on the playback adapter side.

Electronic still cameras, such as those shown in Figure 2, are being developed that can record not only still images, but also audio signals related to the still images taken.

Recording of audio signals with an electronic still camera is described, for example, in JP-A-62-99972 and JP-A-62-9507.
As disclosed in Japanese Patent Application No. 9, this is accomplished by collecting an audio signal for a predetermined period of time, compressing the audio signal into a time corresponding to one field, and recording it on one track.

At this time, the audio signal is recorded with one track divided into, for example, four sectors. A series of audio signals may be recorded completely on one track or may be recorded over multiple tracks. A flag and a control code are added to each sector of the audio track. The flag has start, connection, and end information, and part of the control code contains the track number of the corresponding video signal. During playback, information on these flags and control codes is used to play back a series of audio signals.

An error detection code is added to the control code, and this error detection code allows errors in the control code to be detected.

[Problem to be solved by the invention]

In this manner, in an electronic still camera that is capable of recording audio signals, one track is divided into four sectors, and the time-base compressed audio signals are recorded. And each sector of the audio track has a start, concatenation,
A flag with end information and a control code containing the track number of the corresponding video signal are added.

Therefore, in electronic still cameras that can record audio signals, if there is a defect in the audio track on which flags or control codes are recorded, the concatenation information of each sector will be lost. Even if the signal is complete, the audio signal will not be playable.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disc playback device that is capable of playing back audio signals even if the connection information of each sector is lost.

[Means to solve the problem]

The present invention provides a disc playback device that plays a disc on which a time-compressed audio signal is recorded together with a still image video signal, in which the time-compressed audio signal is recorded with one track divided into a plurality of sectors, A flag and connection information are added to each sector; an error detection means for detecting an error in the connection information added to each sector; a means for collating a corresponding video track from the connection information added to each sector; means for detecting a sector type from a flag added to the error detection means, detecting the error detection result information detected by the error detection means, the corresponding video track information collated by the means for collating the corresponding video track, and the sector type. This disc playback device forms a directory using sector type information detected by a means for detecting the sector type information.

[Effect]

In the camera body 1 to which the present invention is applied, time-compressed audio signals are not recorded across multiple tracks. Therefore, if there is no error in the control code CTC as a result of error detection using the CRC code in sectors 2 or more and less than 4 in one track, and the corresponding video track numbers indicated by the control codes CTC without errors are equal. , the track is determined to be one complete sound, and playback is started from sector #0, ignoring the connection information indicated by the start flag STF and end flag ENF.

However, when audio signals are recorded with other electronic still cameras, a series of audio signals may be recorded over multiple tracks, so make sure that the corresponding video track numbers are the same and that there are no errors in the control code. If there are multiple tracks on the same disk that have more than 2 sectors and less than 4 sectors, if there is no error in the control code CTC on these tracks, the start flag ST
Only when there is only one sector of type TYP2 or TYP3 indicated by the sector type F and end flag ENF, the connection information indicated by the start flag STF and end flag ENF of other sectors is ignored, and the connection information of the outer track is ignored. Audio reproduction is performed sequentially starting from the 0th sector.

〔Example〕

An embodiment of the present invention will be described in the following order.

a, Explanation of the external appearance of the camera body, Explanation of the external appearance of the playback adapter C, Configuration of the camera body d, Configuration of the playback adapter e, Explanation of processing in dubbing mode with the camera body alone f, Simultaneous operation with the camera body alone Explanation of processing in recording mode g, Explanation of processing during dubbing when a playback adapter is connected, About audio signal playback h, Audio signal recording format h2. Control code information h3. Creating an index table h4. Processing when there is an error in connection information a. Outline of the external appearance of the electronic still camera body In the electronic still camera to which this invention is applied, it is possible to record audio signals related to the still images taken along with still images. .

FIG. 1 shows an overall camera body 1 to which the present invention is applied. In FIG. 1, an imaging lens, a strobe light emitting window, etc. are arranged on the front side surface IA of the camera body 1, although not shown.

A vinyl finder 2 is located on the rear side IB of the camera body 1.
, a built-in microphone 3, and an external microphone jack 4 are provided. Further, a connector 5 for connecting a playback adapter is provided on the rear side IB of the camera body 1.

A disk insertion slot 6 is provided at the center of the rear side of the camera body 1. A magnetic disk cassette 7 (FIG. 2) is inserted into this disk insertion slot 6.

Still images and audio signals related thereto are recorded on a magnetic disk 41 housed in the magnetic disk cassette 7. The magnetic disk cassette 7 can be ejected by an eject switch 8.

A cover 9 is provided to cover the upper IC of the camera body 1.

A battery storage recess is formed at a position corresponding to this cover 9, and a charging pack or a dry battery is stored in this battery storage recess.

A liquid crystal display 10 is disposed near the disk insertion slot 6. Various operation setting states are displayed on this liquid crystal display 10. For example, when performing dubbing, the number of seconds remaining for sound recording is displayed.

Also, if you want to interrupt sound collection and delete the audio, press "E".
is displayed. Furthermore, a warning is displayed on the liquid crystal display 10 indicating that the number of remaining tracks is decreasing.

The camera body 1 is provided with various switches.

These switches will be explained.

11 is a recording/playback mode changeover switch. The recording/reproducing mode changeover switch 11 is a three-position slide switch. This recording/reproduction mode changeover switch 11 allows setting of three audio recording modes: "no sound", "dubbing", and "simultaneous recording".

When using the camera body 1 alone, if you set the recording/playback mode selector switch 11 to the "dubbing" position, by operating the dubbing switch 12 (described later),
It becomes possible to post-record audio signals related to photographed still images. The possible time for audio input during dubbing is, for example, 9.6 seconds. If the recording/playback mode selector switch 11 is set to the "simultaneous recording" position, audio input will be possible for, say, 9.6 seconds from the time still image shooting ends, and the audio signals input during this time will be It is recorded in conjunction with the still image taken.

Note that in the "no sound" position, only still image shooting is performed.

When the camera body 1 and playback adapter 21 (Fig. 3) are connected and used, the recording/playback mode selector switch 11 is set to "
Only when set to the "dubbing" position or the "simultaneous recording" position, the related audio signals can be dubbing while viewing the playback screen. When the camera body 1 and playback adapter 21 are connected and used, the operation when the recording/playback mode selector switch 11 is set to the "dubbing" position and the operation when it is set to the "simultaneous recording" position are different. It's the same.

12 is a dubbing switch. When the dubbing switch 12 is operated to input audio to the built-in microphone 3 or an external microphone attached to the external microphone jack 4, audio signals can be recorded. As the dubbing switch 12, in order to prevent erroneous operation, a switch that enters the dubbing state when the protrusion 12A is pushed and slid is used. Further, since a switch like this does not move unless it is pressed, there is no noise from the switch operation.

Reference numeral 13 denotes a bushing switch which functions as an audio repeat switch during reproduction and as a half-release state setting switch during recording. That is,
When the button switch 13 is pressed during playback, the audio signal is repeatedly played back. Button switch 1 when recording
When 3 is pressed, power is supplied to the imaging section and the recording section, the disk starts rotating, and the camera is set to a shooting standby state.

14 is a mode switch. This mode switch 14
is a four-position rotary switch, and this mode switch 14 allows setting of four modes: "Lock", "Single Shooting", "Continuous Shooting", and "High Speed Continuous Shooting". In single-shot mode, one image is photographed each time a release button 18 (described later) is pressed. In the quick shooting mode, continuous shooting is performed while the release button 18 is pressed. However, when the recording/playback mode selector switch 11 is set to the "simultaneous recording" position, the mode switch 14 is set to "continuous recording".
Even if you set the camera to this position, single shot will be taken.

15 is a self-timer switch. With this self-timer switch 15 pressed in, release button 1
By pressing 8, timer photography is performed.

16 is a buzzer on/off switch. When the buzzer is set to the on state, various warnings and, for example, the start time and end time of sound collection during dubbing can be known from the buzzer sound.

17 is a blank search mode setting switch. When the blank search mode is set, the next photographed signal can be recorded on an empty track on the magnetic disk 41.

18 is a release button. The release button 18 is
It can be pushed in two stages. When the release button 18 is pressed lightly, power is supplied to the imaging section and the recording section, the rotation of the disk is started, and the shooting standby state is set. When the release button 18 is fully pressed, the still image captured by the imaging element at this time is recorded. Further, the release button 18 functions as a frame advance switch during playback.

This camera body 1 alone can record still images and audio signals related thereto. When performing playback, connect the playback adapter 21 (described later) to the camera body 1.
need to be connected to.

b. Outline of external appearance of regeneration adapter FIG. 3 shows the regeneration adapter 21 as a whole. This playback adapter 21 is used by being connected to the camera body 1 when playing back still images taken with the camera body 1.

In FIG. 3, the upper surface 21A of the regeneration adapter 21 has a storage opening 2 for storing the charging pack 23 or dry batteries.
2 is formed. A cover 24 is slidably attached to the upper part of the reproduction adapter 21 so as to cover the storage recess 22.

Connecting cable 25 from side 21B of playback adapter 21
When reproducing still images taken with the camera body 1 using the reproduction adapter 21 from which the connector 26 is attached to the tip of the connection cable 25, the connector 26 engages with the connector 5 of the camera body 1. be done.

An output terminal 27 is provided on the side surface 21C of the playback adapter 21. This output terminal 27 is connected to an input terminal of a monitor receiver. Also, the side 2 of the playback adapter 21
A DC input terminal 28 is provided at 1C. A plug 30 of an AC adapter 29 is connected to this DC input terminal 28 .

Reference numeral 31 represents a playback button for playing back still images one frame at a time. 32 is a continuous playback button for continuously playing still images, for example every 5 seconds; 33 is a stop button; 34
is a reverse button, 35 is a forward button, 36 is an erase button for erasing still images one frame at a time,
37 is an auto erase button for erasing all signals on the magnetic disk. Note that the cover 24 of the reproduction adapter 21 is normally in a closed state, and the charging pack 23 and the operation buttons 31 to 37 are not exposed to the outside.

C. Composition of the camera body FIG. 4 shows the configuration of the camera body 1.

In FIG. 4, 41 is a magnetic disk.

This magnetic disk 41 is housed in a magnetic disk cassette 7, as shown in FIG. The magnetic disk 41 is rotated by a spindle motor 42. The rotation of the spindle motor 42 is controlled by the system controller 48.
It is controlled by a spindle servo circuit 43 under the control of.

44 is a magnetic head, and the magnetic head 44 performs recording/reproduction on the magnetic disk 41.

The position of the magnetic head 44 is controlled by a tracking servo circuit 45 under the control of a system controller 48 .

A key switch 47 is connected to the system controller 4. The key switch 47 is composed of various switches on the camera body 1.

Further, a liquid crystal display 10 is connected to the system controller 48 . Various setting states are displayed on this liquid crystal display 10. A buzzer 46 is connected to the system controller 48. If necessary, this buzzer 46
is sounded.

By operating the key switch 47, still images and audio signals can be recorded.

switch circuit 61, switch circuit 63, switch circuit 6
4 is switched between when recording a video signal and when recording an audio signal. When recording video signals, the switch circuit 6
1. The switch circuit 63 and the switch circuit 64 are each a
can be switched to the side.

When recording an audio signal, the switch circuit 61, the switch circuit 63, and the switch circuit 64 are each switched to the b side.

Further, the switch circuit 66 is switched between recording and reproduction. When recording a video signal or an audio signal, the switch circuit 66 is switched to the a side.

First, the case of recording a still image video signal will be explained. Note that at this time, the switch circuit 61 and the switch circuit 63 are each switched to the a side, and the switch circuit 66 is switched to the a side. In Figure 4, CCD
A subject image is formed on an image sensor 49 such as a MOS or a MOS via a lens 50 and an iris ring 51. Image sensor 4
9 is supplied to a line sequential processing circuit 54 via an amplifier 52 and a process circuit 53.

The opening and closing of the iris ring 51 is controlled by the output of the iris drive circuit 55. Iris control circuit 55 is controlled based on instructions from system controller 48.

This performs iris control. Further, the image sensor 49 is driven by the output of the drive circuit 56. The drive circuit 56 is controlled based on commands from the system controller 48.

A line sequential circuit 54 converts the luminance signals Y, ! from the component color video signals to the luminance signals Y, ! : Forms line sequential color difference signals (R-y) and (B-Y). A signal captured by the image sensor 49 and passed through an amplifier 52 and a process circuit 53 is converted into a luminance signal Y and line sequential color difference signals (R-Y) and (B-Y) in a line sequential circuit 54. Ru.

The line sequential color difference signals (R-y) and (B-Y) from the line sequential circuit 54 are sent to F via a pre-emphasis circuit 57.
The signal is supplied to the M modulation circuit 58. The FM modulation circuit 58 performs FM modulation on the line sequential color difference signals (R-Y) and (B-Y). The output of the FM modulation circuit 58 is supplied to one input terminal of the addition circuit 59.

The luminance signal Y from the line sequential circuit 54 is sent to the FM modulation circuit 6 via a pre-emphasis circuit 60 and a switch circuit 61.
2. The FM modulation circuit 62 converts the luminance signal Y to FM.
Modulated. The output of the FM modulation circuit 62 is connected to the switch circuit 6
3 to the other input terminal of the adder circuit 59.

The adder circuit 59 adds the FM output from the FM modulation circuit 58.
Modulated line sequential color difference signals (R-Y) and (B-Y)
and the FM-modulated luminance signal Y output from the FM modulation circuit 62 are frequency division multiplexed.

The output of the adder circuit 59 is sent to the switch circuit 64 and the recording amplifier 6.
5. The signal is supplied to the magnetic head 44 via the switch circuit 66. A video signal is recorded on the track of the magnetic disk 41 by the magnetic head 44 .

69 is a strobe discharge tube. A discharge circuit 70 is connected to the strobe discharge tube 69 . When photographing using a strobe, a tube 69 is used to emit the strobe. The strobe discharge tube 69 is controlled by the system controller 48.
This is done based on control signals from.

71 is a diode for photometric detection. diode 71
The current flowing through is detected by the detection circuit 72, and the detection output is supplied to the system controller 48.

Next, the case of recording an audio signal will be explained.

When recording audio signals, the switch circuit 61
, switch circuit 63, and switch circuit 64 are switched to the b side.

Audio input can be performed using the built-in microphone 3 as well as from an external microphone 83 connected to the external microphone jack 4. When using the built-in microphone 3, the switch 81 is switched to the a side. When using the external microphone 83, the switch 81 is switched to the b side. This switch 81
The switching state of is detected by the switch detection means 82,
This detection signal is supplied to the system controller 48.

Built-in microphone 3 or external microphone jack 4
An audio signal from an external microphone 83 connected to is supplied to an amplifier 84 via a switch 81. The output of the amplifier 84 is band-limited via a bypass filter 85 and a low-pass filter 86, and is then passed through a compressor 87 for noise removal. Then, it is digitized by an A/D converter 88.

A sampling clock having a frequency fs is supplied to the A/D converter 88 from a write clock generation circuit 89. Further, a clock from a write clock generation circuit 89 is supplied to an address counter 91.

Address counter 91 is controlled by the output of system controller 48. During writing, the address from the address counter 91 is sent to the write clock generation circuit 8.
9 with a frequency fs.

The audio signal digitized by the A/D converter 88 is written into the RAM 90 according to the write address from the address counter 91.

During reading, the address from address counter 91 is advanced by a clock with a frequency of 640 fs output from read clock generating circuit 92. According to the read address output from address counter 91, the audio signal stored in RAM 90 is read out.

The output of the RAM 90 is returned to an analog signal by a D/A converter 93. The D/A converter 93 is supplied with a clock having a frequency of 64 fs from the read clock generation circuit 92.

In this way, the input audio signal is digitized with the sampling clock of frequency f''s and written into the RAM 90, and the digital audio signal stored in the RAM 90 is read out with the clock of frequency 640 fs.

As a result, the audio signal is time-axis compressed to 1/640.

The output of the D/A converter 93 is supplied to an adder circuit 94. The flag and control code generating circuit 95 generates a flag and a control code indicating linkage information in the adder circuit 94 at a predetermined timing. This flag and control code are added to a predetermined position of the time-base compressed audio signal.

The output of the adder circuit 94 is supplied to the FM modulation circuit 62 via the pre-emphasis circuit 96 and the switch circuit 61.

The output of the FM modulation circuit 62 is supplied to the magnetic head 44 via a switch circuit 63, a switch circuit 64, a recording amplifier 65, and a switch circuit 66. By the magnetic head 44,
This time-base compressed audio signal is transferred to the magnetic disk 4.
1 is recorded.

The system controller 48 of the camera body 1 and the system controller 101 (FIG. 5) of the playback adapter 21 are bidirectionally connected via an interface 97 and an interface 102.

In addition, the output terminal 68 is the input terminal 1 of the playback adapter 21.
11.

Next, the time of reproduction will be explained. During reproduction, the switch circuit 66 is switched to the b side. And magnetic herad 4
The reproduced signal No. 4 is outputted from an output terminal 68 via a switch circuit 66 and an amplifier 67.

Further, the output of the amplifier 67 is supplied to a signal detection circuit 98. Although playback operations cannot be performed with this camera body 1 alone,
Whether a signal is recorded on a track of the magnetic disk 41 can be detected from the output of the signal detection circuit 98. The detection signal of this signal detection circuit 98 is supplied to the system controller 48.

d. Configuration of playback adapter FIG. 5 shows the configuration of the playback adapter 21.

In FIG. 5, the input terminal 111 is connected to the output terminal 68 of the camera body 1. In FIG. In addition, the system controller
101 is bidirectionally connected to the system controller 48 of the camera body 1 via the interface 102 and the interface 97. Further, a key switch 103 consisting of various operation switches provided on the playback adapter 21 is connected to the system controller 101 .

The output from the output terminal 68 of the camera body 1 is input from the input terminal 111 of the playback adapter 21.

The switch circuit 113, the switch circuit 120, and the switch circuit 122 are switched between when reproducing a video signal and when reproducing an audio signal. When reproducing a video signal, the switch circuit 113, the switch circuit 120, the switch circuit 122
are switched to the a side, respectively 6. During audio signal playback, the switch circuit 113, the switch circuit 120,
The switch circuits 122 are respectively switched to the b side.

First, the video signal reproduction will be explained. When reproducing a video signal, the switch circuit 113, the switch circuit 120, and the switch circuit 122 are switched to the a side. Input terminal 1
A video signal reproduced from the magnetic disk 41 of the camera body 1 is supplied to 11 . This video signal is a signal obtained by frequency division multiplexing an FM-modulated luminance signal Y and FM-modulated line-sequential color difference signals (R-y) and (B-Y).

A video signal from an input terminal 111 is supplied to a bandpass filter 114 and a bandpass filter 119 via an amplifier 112 and a switch circuit 113.

The band-pass filter 114 extracts the FMS-tuned line sequential color difference signals (RY) and (B-Y). The output of this bandpass filter 114 is supplied to an FM demodulation circuit 116. The FM demodulation circuit 116 demodulates the line sequential color difference signals (R-Y) and (B-Y). FM
The output of the demodulation circuit 116 is supplied to the video signal processing circuit 11B via a de-emphasis circuit 117.

The bandpass filter 119 extracts the FMilned luminance signal Y. The output of the bandpass filter 119 is supplied to the FM demodulation circuit 121 via the switch circuit 120. The FM demodulation circuit 121 demodulates the luminance signal Y. The output of the FM demodulation circuit 121 is sent to the switch circuit 12
2. The signal is supplied to the video signal processing circuit 118 via the de-emphasis circuit 123.

The video signal processing circuit 118 processes a line sequential color difference signal (R-
Y) and (B-Y), and the component signal Y
and (RY), (BY).

The output of video signal processing circuit 118 is provided to NTSC encoder 124. The NTSC encoder 124 converts the component signals Y and (RY), (B-Y) to N
A TSC-based composite color video signal is formed. This NTSC composite color video signal is output from the output terminal 125.

Next, the time of audio signal reproduction will be explained.

When reproducing an audio signal, the switch circuit 113, the switch circuit 120, and the switch circuit 122 are each switched to the b side.

A playback audio signal that has been time-base compressed and FM modulated is supplied to an input terminal 111 . This reproduced audio signal is supplied to an FM demodulation circuit 121 via an amplifier 112, a switch circuit 113, and a switch circuit 120. FM
The demodulation circuit 121 performs FM demodulation on the audio signal from the input terminal 111.

The output of the FM demodulation circuit 121 is supplied to a de-emphasis circuit 131 via a switch circuit 122. The output of the de-emphasis circuit 131 is supplied to the A/D converter 134 via the low-pass filter 132, and
The flag and control code are detected by a flag and control code detection circuit 133. This detection output is supplied to the system controller 101.

The A/D converter 134 is supplied with a clock having a frequency of 640 fs from the write clock generation circuit 135. The A/D converter 134 samples the time-base compressed audio signal using a clock having a frequency of 640 fS.

Also, the frequency 6 from the write clock generation circuit 135
A 40 fs clock is supplied to the address counter 137. During writing, the address output from the address counter 137 is advanced by this clock with a frequency of 640 fs. This write address is supplied to RAM 136.

The output of the A/D converter 134 is supplied to the RAM 136, and the audio signal from the A/D converter 134 is written into the RAM 136.

During reading, a clock with a frequency fs from the read clock generation circuit 138 is supplied to the address counter 137, and the address output from the address counter 137 is advanced by the clock with a frequency fs. By the address from this address counter 137, the RAM 13
The audio signal stored in 6 is read out.

The output of RAM 136 is supplied to D/A converter 139. The D/A converter 139 is supplied with a clock of frequency fs from the read clock generation circuit 138. The output of the RAM 136 is converted back to an analog signal by a D/A converter 139.

In this way, the playback audio signal that has been time-axis compressed to 1/640 is stored in the RAM 13 using a clock with a frequency of 640 fs.
6 and read with a clock of frequency fs, the time axis is returned to its original state.

The output of the D/A converter 139 is passed through the low-pass filter 140.
, are taken out from the output terminal 142 via the expander 141.

When reproducing an audio signal using this reproduction adapter 21, information about what kind of signal is recorded on which track is required. Index table 14
3, information such as what kind of signal is recorded on which track is recorded. Further, in order to create such an index table, a flag and control code detection circuit 133 and a vertical synchronization detection circuit 144 are provided.

e. Explanation of the processing when the camera body 1 is in the dubbing mode by itself Figure 6 shows the processing when the recording/playback mode changeover switch 11 of the camera body 1 is set to "dubbing" and the dubbing process is performed by the camera body 1 alone. Explain with reference to the flowchart.

When the single-shot mode is set by the mode switch 14, one still image is taken each time the release button 18 is pressed. The video signal of this still image is recorded on an annular track of the magnetic disk 41. When the recording/reproducing mode changeover switch 11 is set to "dubbing", an empty track for audio is prepared on the outer circumferential side of the video signal recording track. If the history of the recording state of the magnetic disk 41 is remembered, an audio signal related to a photographed still image can be post-recorded on this empty track for audio. The sound collection time during dubbing was 9.6 seconds.

Furthermore, when the quick-shooting mode is set, still images are continuously taken while the release button 18 is held down. The video signal of this still image is recorded on an annular track of the magnetic disk 41. When the recording/reproducing mode changeover switch 11 is set to "dubbing", one track on the outer periphery of the video track first recorded during quick shooting is prepared as an empty track for audio. On this empty track for audio, it is possible to post-record an audio signal related to the first still image taken during quick shooting. The sound collection time during dubbing was 9.6 seconds.

That is, in FIG. 6, it is determined in step 151 whether the release button 18 has been pressed. If the release button 18 has been pressed, it is determined whether the single shooting mode is selected (step 152). In the single shooting mode, one track is left open on the outer circumferential side, and a video signal is recorded on the track of the magnetic disk 41 after shooting (step 153).

When the release button 18 is pressed, in the snapshot mode, first, one track on the outer periphery is cleared (step 154).
), and the video signal is recorded on the next track (step 15).
5) Then, it is determined whether the release button 18 is pressed (step 156), and the release button 1 is pressed.
If 8 remains pressed, the process returns to step 155, and the video signal of the next still image is continuously recorded on the next track.

As a result, as shown in FIG. 7A, in the single shooting mode, the recording track of the still image video signal is reduced to VI1%.
Empty track A for audio on the outer circumference of Its...
ll, Alg, . . . are provided, respectively.

In addition, in the case of snapshot mode, as shown in Figure 7B,
An empty track A z 1 for audio is provided on the outer circumference, and a recording track V! of continuously shot still image video signals is provided on the inner circumference. 1% VRl, vzs... are provided.

In FIG. 6, it is determined whether the dubbing switch 12 is pressed (step 157), and if the dubbing switch 12 is pressed, a buzzer is sounded for 0.4 seconds to notify the start of sound collection (step 158). Wait 0.4 seconds after the dubbing switch 12 is pressed and released (step 159), and the sound collection time T7 is initialized to 0 (step 160), and then 0.4 seconds after the dubbing switch 12 is pressed and released. Sound collection starts after a second (step 161).

It is determined whether or not the dubbing switch 12 is pressed during sound collection (step 162), and if the dubbing switch 12 is not pressed during sound collection, the release button 18 is pressed during sound collection.
It is determined whether the is pressed halfway (step 163
), if the release button 18 is not pressed halfway during sound collection, it is determined whether 9.6 seconds have elapsed for the sound collection time T7 (step 164).

When the sound collection time T7 has reached 9.6 seconds, a buzzer sounds (step 165L), informing that the sound collection time has ended. Then, it is determined whether the mode is single shooting mode or continuous shooting mode (step 166). In the single-shot mode, the collected audio signal is recorded in an empty track provided on the outer periphery of the recording track for the still image video signal (step 1).
67). In the snapshot mode, the collected audio signal is recorded in an empty track provided on the outer periphery of the recording track of the first still image video signal during the snapshot (step 16B).

Recording may fail while collecting sound. In this case,
The dubbing switch 12 is pressed during sound recording, or
The release button 18 is pressed halfway during sound collection.

In step 162, it is determined whether the dubbing switch 12 has been pressed during sound collection. Further, in step 163, it is determined whether the release button 18 is pressed halfway. If the dubbing switch 12 is pressed during sound collection or the release button 18 is pressed halfway during sound collection, it is determined whether the mode is single shooting mode or continuous shooting mode (step 169).

In the single-shot mode, the signals of the outer tracks of the recording track of the still image video signal are erased (step 170).
.

If it is the quick-shot mode, the signals of the outer tracks of the recording track of the first still image video signal during quick-shot are erased (step 171).

A photo opportunity may occur while recording sound.

In this case, the release button 18 is fully pressed. When the release button 18 is fully pressed, still images and shadows are prioritized over sound collection. This allows you to take pictures without missing a photo opportunity.

That is, in step 172, it is determined whether the release button 18 has been fully pressed.

If the release button 18 is fully pressed, one track on the outer periphery is left open for audio, and a still video signal is recorded (step 173).

f. Description of processing in simultaneous recording mode when the camera body 1 is alone FIG. 8 shows the processing when the camera body 1 is set to the "simultaneous recording" mode by itself. "Simultaneous recording"
The mode is set by the recording/reproducing mode changeover switch 11. In the "simultaneous recording" mode, each time the release switch 18 is pressed and a still picture is taken one by one, the video signal of this still picture is recorded on the annular track of the magnetic disk. At this time, an empty track is provided on the outer peripheral side of the video signal recording track. At the same time, when a still image is taken, a state is set in which an audio signal can be input. The input audio signal is then recorded in association with the photographed still image. The sound collection time when the audio signal is input is 9.6 seconds.

That is, in FIG. 8, it is determined whether the release button 18 has been pressed (step 2.1). If the release button 18 is pressed, one track on the outer periphery is left open for audio and a video signal is recorded. (Step 20
2).

Then, a buzzer sounds for 0.4 seconds (step 203).
The rotation of the L disk is stopped (step 204), 0
．． After waiting 4 seconds (step 205), the sound collection time T7 is set to O (step 206).

The reason why sound collection is started after waiting 0.4 seconds is to allow sound collection to be performed after the rotation of the disk has completely stopped. If the disk is rotating during sound collection, noise generated by the rotation of the disk may be mixed in.

When the sound collection time T7 is set to 0, sound collection is performed (step 207).

It is determined whether the dubbing switch 12 was pressed during sound collection (step 20B). If the dubbing switch 12 was not pressed during sound collection, it is determined whether the release button 18 was pressed halfway (step 20B). 209).

During sound recording, the dubbing switch 12 and release button 18 are pressed.
If has not been pressed, it is determined whether the sound collection time Tfi has reached 9.6 seconds (step 210).

When the sound collection time T7 reaches 9.6 seconds, a buzzer sounds for 0.4 seconds (step 211), and the disk is rotated (step 212). Then, the input audio signal is recorded in an empty track on the outer periphery of the still image video signal recording track (step 213).

Recording may fail while collecting sound. In this case,
The dubbing switch 12 is pressed during sound recording, or
The release button 18 is pressed halfway during sound collection.

In step 208, it is determined whether the dubbing switch 12 has been pressed during sound collection. Further, in step 209, it is determined whether the release button 18 is pressed halfway. If the dubbing switch 12 is pressed during sound collection or the release button 18 is pressed halfway during sound collection, the signals of the outer tracks of the recording track of the still image video signal are erased (step 214 ).

A photo opportunity may occur while recording sound. In this case, the release button 18 is fully pressed. When the release button 18 is fully pressed, still image shooting is prioritized over sound collection. That is, if the release button 18 is fully pressed in step 215, one track on the outer periphery is made available for audio, and a still image video signal is recorded (step 216).

g. Description of processing during dubbing when playback adapter is connected FIG. 9 shows the processing when performing dubbing with the camera body 1 and playback adapter 21 connected.

When the camera body 1 and the playback adapter 21 are connected and the dubbing switch 12 is pressed, dubbing can be performed.

When the camera body 1 and the playback adapter 21 are connected, the recording/playback mode selector switch 11 is set to "dubbing" or "dubbing".
Dubbing can only be performed if the mode is set to ``Simultaneous Recording'' and you are using manual frame-by-frame forwarding during playback. When connecting the external microphone 83 to the external microphone jack 4 and collecting sound using this external microphone 83,
It is possible to collect sound while the screen is playing.

When collecting sound using the built-in microphone 3, the rotation of the disk is stopped and the playback screen is muted. This is to prevent the rotation sound of the disk from being mixed in as noise when the built-in microphone 3 is used.

In FIG. 9, it is determined whether or not the post-recording button 12 has been pressed (step 301).

At this time, it is determined whether the recording/playback mode selector switch 11 is set to "dubbing" or "simultaneous recording" (step 302), it is determined whether playback is in progress (step 303), and whether manual frame advance is selected or not is determined (step 302). It is determined whether or not (step 304).

If the recording/playback mode selector switch 11 is set to "dubbing" or "simultaneous recording" and the dubbing switch 12 is pressed while playback is in progress and manual frame advance is selected, the 0
．． A buzzer sounds for 4 seconds (step 305) to notify that sound collection will start.

At this time, if there is a reproduced sound (step 306), it is immediately muted (step 307). Then, it is determined whether the external microphone 83 is connected to the external microphone jack 4 (step 308).

If an external microphone 83 is connected to the external microphone jack 4, this external microphone 83 will
Sound recording is performed.

In other words, if the external microphone 83 is connected to the external microphone jack 4, wait 0°4 seconds (
Step 309), the sound collection time T7 is set to 0 (Step 310). And external microphone jack 4
Sound is collected by the external microphone 83 connected to the external microphone 83 (step 311).

It is determined whether the dubbing switch 12 is pressed during sound collection (step 312L).
If 2 is not pressed, it is determined whether 9.6 seconds have passed for the sound collection time T7 (step 313).

When the sound collection time Tfl has elapsed for 9.6 seconds, a buzzer sounds for 0.4 seconds (step 314), and the video is muted (step 315).

Then, it is determined whether there is an audio track corresponding to the video (step 316), and if there is an audio track corresponding to the video, the audio signal collected on the track corresponding to the video is recorded (step 317). ). Once the audio signal is recorded, the original video is returned to and the still image is played back (step 318).

If there is no audio track corresponding to the video, it is determined whether there is an empty track on the outer periphery of the video signal recording track (step 319).

If there is an empty track on the outer periphery of the video track, the audio signal collected in the empty track on the outer periphery of the video track is recorded (step 320). Once the audio signal has been recorded, the process proceeds to step 318, where the original video is returned and the still image is played back.

If it is determined in step 319 that there is no free track on the outer circumference of the video track, the audio signal collected is recorded on the free track on the inner circumference of the video track (step 321). Once the audio signal has been recorded, the process proceeds to step 318, where the original video is returned and the still image is played back.

In this way, when it is determined in step 308 that the external microphone 83 is connected, sound is collected without stopping the rotation of the disk. Therefore, it is possible to collect sound while viewing the playback screen.

When it is determined in step 30B that the external microphone 83 is not connected, the video is immediately muted (step 322) and the rotation of the disk is stopped (step 323).

Then, after waiting 0.4 seconds (step 324), the sound collection start time T7 is initialized (step 325).
．． 4 seconds corresponds to the time until the rotation of the disk completely stops.

After the sound collection time T7 is initialized, sound collection is started (step 326).

It is determined whether the dubbing switch 12 was pressed during sound recording (step 327), and if the dubbing switch 12 was not pressed during sound recording, it is determined whether the sound recording time T, 1 has elapsed for 9.6 seconds. be judged (Ste. 328).

When the sound collection time Tfi has elapsed for 9.6 seconds, a buzzer sounds for 0.4 seconds (step 329), the rotation of the disk is started (step 330), and the process proceeds to step 316.

In this way, when it is determined in step 308 that the external microphone 83 is not connected, and when the built-in microphone 3 is used to collect sound, the rotation of the disk is stopped at step 323 before sound collection, and the sound collection is completed. Later step 330
The disc starts rotating, and stops while recording sound.

This can prevent noise from being mixed in due to the rotational sound of the disk during sound collection.

There are times when recording fails while collecting sound. In this case, the dubbing switch 12 is pressed during sound collection.

If it is determined in step 312 or step 327 that the dubbing switch 12 has been pressed during sound recording, it is determined whether there is an audio track corresponding to the video (
Step 331). If there is an audio track corresponding to the video, the audio signal recorded on this audio track is erased (step 332).

h, audio signal recording format h1. Regarding reproduction of audio signals, FIG. 10 shows the recording format of audio signals recorded on the magnetic disk 7. As shown in FIG.

When recording a time-compressed audio signal, one track consists of four sectors #0, as shown in Figure 10.
It is divided into ~#3.

As shown in FIG. 11, each sector #0 to #3 records a time-axis compressed audio signal TCA, as well as a start flag STF and a control code CT.
D. End flag EDF is added. Note that the time-base compressed audio signal TCA includes an overlap portion OL. In this overlap part OL,
The same audio signal is recorded as the last audio signal of the previous sector in the continuous sequence.

There are four types of sectors: TYPI to TYP4. Types TYPI and TYP2 are those in which the sector is used and is at the beginning or middle of a continuous sequence. The type TYP1 is the beginning or middle of the continuous sequence within the track, and the type TYP2 is the end of the continuous sequence within the track. TYP3 indicates that the track is being used and is the last of the continuous sequence.

Type TYP4 is not used for recording audio signals.

That is, in the type TYPI, an audio signal is recorded in that sector, and a consecutive sequence of signals is recorded in the same track.

In type TYP2, an audio signal is recorded in that sector, and a sequence of signals following this is recorded in the first sector #0 of another track.

For type TYP3, it is the last of the continuous sequence.

In type TYP4, no audio signal is recorded.

These types TYPI to TYP4 have a start flag STF and an end flag ENF, as shown in FIG.
Classified by.

That is, in type TYPI, the start flag STF
is set to high level, and the end flag E NF is set to low level.

In type TYP2, the start flag STF is at a high level and the end flag ENF is at a low level.

In type TYP3, the start flag STF is at a high level and the end flag ENF is at a high level.

In type TYP4, the start flag STF is set to low level and the end flag ENF is set to high level.

h2. Control code information Next, the control code CTD will be explained.

The control code CTD is as shown in FIG.
It consists of 108 bits. These 108 bits are 9 data words W1 to W9 (8 bits per data word).
, a 16-bit (equivalent to 2 data words) CRC code WIO1Wll, an 8-bit (equivalent to 1 data word) synchronization code WO, and a 12-bit start bit (each 8
(one bit is assigned to each bit).

These data words W1 to W9 contain the track number, the track number of the sector in which the beginning of the continuous sequence is recorded, the track number of the sector in which the next signal of the continuous sequence is recorded, and the recording track of the corresponding video signal. It is used to record information such as track number, playback mode, time compression ratio, option code, date, etc.

That is, in FIG. 13, WO is the synchronization code, Wl is the track number, W2 is the track number of the sector where the beginning of the continuous sequence is recorded, and W3 is the track number of the sector where the next signal of the continuous sequence is recorded. , W4 is the track number of the recording track of the corresponding video signal, W5 is unused, W6 is the playback mode, time compression ratio, option code, Wl is the day, W8 is the month, W
O is the year, and WIO and Wll are the CRC codes.

h3. Creation of Index Table In order to reproduce the magnetic disk 41 on which audio signals are recorded together with still image video signals in such a format, it is first necessary to create an index table. The creation of this index table will be explained.

When the camera body 1 and the playback adapter 21 are connected, an index table is created under the following conditions.

- Condition 1: When the magnetic disk cassette 7 is attached to the camera body 1 and a battery is stored in only one of the camera body 1 and the playback adapter 21 for the first time.

Condition 2: When at least one of the camera body 1 and playback adapter 21 is loaded with a battery, and the magnetic disk cassette 7 is attached to the camera body 1.

Condition 3: When at least one of the camera body 1 and the playback adapter 21 is loaded with a battery, and the camera body 1 with the magnetic disk cassette 7 attached is connected to the playback adapter 21.

Creation of the index table 143 is performed in the following procedure.

First, each track is reproduced, and it is determined whether the reproduced signal is an audio signal or a video signal. Then, from that information, it is determined that there is one or more sectors in which audio exists in the specified track, the start flag STF and end flag ENF are not illegal, there is no error as a result of the CRC code, and the track number Wt of the control code CTC. is correct and a signal is recorded in the corresponding video track W4, then this track is determined to be an audio track for the time being.

Then, the own track number obtained from Wl of the control code CTC, W6 of the control code CTC
The time axis compression rate obtained from the control code CTC
The sequence start audio track obtained from W2 of the control code CTC and the corresponding video track obtained from W4 of the control code CTC are recorded.

If these conditions are not met, the track is considered an empty track if it seems to be an audio signal, and the other track is used as a video track.

A table as shown in FIG. 14 is created from the results of these processes. Then, this table is rearranged in order of video track number, and an index table as shown in FIG. 15 is created. Audio signals are played back based on this index table.

h4. If there is a defect in the disk area where the audio track's start flag STF, end flag ENF, or control code CTC is recorded, in process 22 when there is an error in the connection information, the information obtained from the start flag STF and end flag ENF is detected. Since the concatenation information of each sector and the corresponding video track number obtained from the control code CTC are lost, even if the time-compressed audio signal is complete, it cannot be played back.

Therefore, the following processing is performed.

In other words, if there is no error in the control code CTC as a result of error detection using the CRC code in sectors 2 or more and less than 4 in one track, and if the corresponding video track numbers indicated by the control codes CTC without errors are equal. , the track is determined to be one complete sound, and playback is started from sector #0, ignoring the connection information indicated by the start flag STF and end flag ENF. In the electronic still camera to which this invention is applied, as mentioned above, the sound collection time is 9.6
This is because the audio signal is not recorded over multiple tracks.

However, when audio signals are recorded with another electronic chill camera, a series of audio signals may be recorded over multiple tracks. Therefore, if there are multiple tracks on the same disk that have the same corresponding video track number and have between 2 and 4 sectors with no error in the control code, it is assumed that there are no errors in the control code CTC on these tracks. start flag S
Only when there is only one sector of type TYP2 or TYP3 indicated by the TF and end flag ENF, the connection information indicated by the start flag STF and end flag ENF of other sectors is ignored, and the connection information of the outer track is ignored. Audio reproduction is performed sequentially starting from the 0th sector.

Note that the results of such processing are stored in an index table, and the index table is successively corrected if no errors are detected during actual reproduction.

〔Effect of the invention〕

According to this invention, as a result of error detection using a CRC code in 2 or more and less than 4 sectors in one track,
If there is no error in the control code CTC, and if the corresponding video track numbers indicated by the control code CTC without an error are equal, it is determined that that track is a single completed sound, and the start flag S is
Reproduction is started from sector #O, ignoring the connection information indicated by TF and end flag ENF. This results in
Even if there is a defect in the disc area where the audio track flag or control code is recorded, playback is possible as long as the time-compressed audio signal is intact.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an example of a camera body, Figure 2 is a perspective view of an example of a magnetic disk cassette, Figure 3 is a perspective view of an example of a playback adapter, and Figure 4 is a block diagram showing the configuration of an example of the camera body. 5 is a block diagram showing the configuration of a playback adapter, and FIG. 6 is a flowchart used to explain post-recording processing. FIG. 7 is a route diagram used to explain an embodiment of the present invention. 8 and 9 are flowcharts used to explain the post-recording process, and FIGS. 10 to 13 are route maps used to explain the recording format of audio signals. FIGS. 14 and 15 are route maps used to explain the creation of the index table. Explanation of main symbols in the drawings 1: Camera body, 3: Built-in microphone, 21: Playback adapter, 41: Magnetic disk, 48, 101 system controller, 49: Image pickup device. 143: Index table. Agent Patent Attorney Tadashi Sugiura Oblique view of the camera body Figure 1 Figure 2 Raised hand to do post-recording video recording mode 88 Figure 1 A Picture recording recording video recording mode Kizugin Figure 7 B Figure 10 Figure 11 Figure 13 Sector type Figure 12 Index table Figure 15

Claims (1)

[Claims] In a disc playback device that plays back a disc on which a time-compressed audio signal is recorded together with a still image video signal, the time-compressed audio signal is recorded with one track divided into a plurality of sectors. At the same time, a flag and connection information are added to each sector, and an error detection means detects an error in the connection information added to each sector, and a corresponding video track is collated from the connection information added to each sector. and means for detecting a sector type from a flag added to each sector, and a means for detecting a sector type from a flag added to each sector, and a correspondence between the error detection result information detected by the error detection means and the corresponding video track. A disc playback device that forms a directory using video track information and sector type information detected by the sector type detecting means.