JPS61168101A - Recording device - Google Patents

Abstract

PURPOSE:To eliminate unnecessary operation in reproduction and to reproduce sound corresponding to images by recording an information signal for controlling the reproducing operation of a start and an end identification signal and an audio signal in each segment together with the audio signal. CONSTITUTION:When audio signals are recorded in respective divided segments SA-SD of a track by time base compression, the start identification signal SID and end identification signal EID are recorded at heads and tails of the time-base compressed audio signals ASA-ASD. An information signal API for controlling the reproducing operation of the audio signal at a specific time interval is recorded at either of the tail of the signals SID or EID. Consequently, unnecessary reproducing operation is removed and sound corresponding to images is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording device such as a so-called electronic still camera that records still images, and particularly to one that can also record audio corresponding to still images.

[Conventional technology]

, Charge Coupled Device (CCD)
An electronic still camera has been proposed that has an imaging device such as an uploaded device and records arbitrary still images on a magnetic disk (Utility Model Application No. 57-19702).
No. 1, etc.).

That is, in the above-mentioned electronic still camera, one field or one frame of video signals from the imaging device is taken out at the time of any shutter operation, and recorded on a disc-shaped magnetic disk. At this time, one field of signals is recorded as one annular track. Therefore, one frame of signal is recorded on two tracks.

In a reproducing device, a video signal of a recorded still image is formed by repeatedly reproducing one track or two tracks alternately and repeatedly. Then, this video signal is supplied to, for example, a monitor television receiver, and a still image is reproduced on the screen, or is printed by a so-called video printer.

In addition to the above-mentioned electronic still cameras, it has been proposed to also be able to record audio corresponding to still images (for example, Japanese Patent Application Laid-Open No. 58-218004, etc.).
. To record audio, for example, use digital signal processing technology to compress the audio signal's time axis, increase the audio signal's band to the video signal's band, and use the same recording system as the video signal. is possible. When using this method, for example, an audio signal up to 5 kHz can be compressed on the time axis to 1/600 to become a signal with a 3 MHz video band, and 600 of that signal can be compressed in one field period (1/60 seconds).
It is possible to record approximately 10 seconds of audio signals. However, in order to perform the above-mentioned digital signal processing on a 10 second audio signal, an extremely large capacity memory device is required. For this reason, for example, 10 seconds is divided into 4 equal parts, and 2.5
It is preferable to reduce the capacity of the memory device by performing digital signal processing on a second-by-second basis. In this case, a series of audio signals divided into four equal parts and time-base compressed are sequentially and continuously recorded in each segment obtained by dividing one track on the magnetic disk into four equal parts.

[Problem that the invention seeks to solve]

However, when a series of audio signals are continuously recorded in four segments (one track), there are problems as described below. For example, as mentioned above, 1
If a 10 second audio signal can be recorded on a book track, and the audio signal is recorded for only 2 seconds, no signal will be recorded for the remaining 8 seconds. Nevertheless, in order to reproduce a 2 second audio signal, the reproduction operation had to be performed for 10 seconds. Also, since audio signals corresponding to different images cannot be recorded unless the interval is at least 10 seconds,
When performing continuous shooting (so-called continuous shooting), it was not possible to record audio corresponding to each image. Furthermore, in cases where audio signals are recorded across multiple tracks, it is not possible to distinguish between image tracks and audio tracks, and it is not always possible to reproduce audio that corresponds to images. Furthermore, it is limited in terms of functionality regarding audio.

The present invention has been proposed in view of the above-mentioned conventional problems, and aims to prevent wasteful playback operations from being performed during playback, and to play back audio that corresponds to images. The purpose is to

Another object of the present invention is to provide multiple functions regarding audio.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a recording device according to the present invention sequentially records one field of video signal as one track in a concentric manner, in which the above-mentioned track When dividing the audio signal into multiple segments and recording the time-axis compressed audio signal in each of the divided segments, start at the front and rear ends of the time-axis compressed audio signal recorded in each segment. An identification signal and an end identification signal are arranged and recorded, and an information signal for controlling the playback operation of the audio signal is arranged at a predetermined time interval at the rear end of either the start identification signal or the end identification signal. It is characterized by being able to record.

In addition, the above end identification signal and the above voice +lf
It is characterized in that the position of the information signal for controlling the active and active side is variable within one segment.

[For production]

According to the present invention, a start identification signal, an end identification signal,
Since an information signal for controlling the reproduction operation of the audio signal is recorded in each segment together with the audio signal, no wasteful reproduction operation is performed during reproduction, and the audio corresponding to the image can be reproduced.

Furthermore, stereo playback, bilingual playback, etc. can also be performed.

[Embodiment] Hereinafter, an embodiment of the recording apparatus according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a waveform diagram showing the form of a signal related to audio recorded in one segment. This signal is not shown in FIG. 2 and is recorded by the recording apparatus of this embodiment.

In FIG. 2, a video signal is supplied to input terminal 1,
After being made into a predetermined recording signal in the recording circuit 2, it is sent to the FM modulation circuit 5 via a pre-emphasis circuit 3 with non-linear characteristics and a changeover switch 4.

The FM modulation circuit 5 converts the signal into an FM signal, and the magnetic head 6 records the signal on a disk D which is rotated at, for example, 3600 rl1m. - The audio signal is supplied to the input terminal 11 and sent to the A/D (analog/digital) conversion circuit 13 via the encoder 12 for noise reduction.

The signal converted into a digital quantity by this A/D conversion circuit 13 is written into the memory 14. The signal read from the memory 14 is then sent to a D/A (digital/analog) conversion circuit 15 and converted into an analog quantity. At this time,
For example, a sampling signal of an audio signal in a band of 5 kHz is supplied from an oscillator 21 to the A/D conversion circuit 13, and is also supplied to an address counter 22 that drives and controls the memory 14. Further, in this embodiment, a signal having a frequency that is, for example, 640 times the sampling signal is supplied from the oscillator 23 to the D/A conversion circuit 15 and also to the address counter 22. Furthermore, a pulse signal every 1760 seconds related to the rotational phase of the disk by a magnetic piece provided at a predetermined portion of the disk D is detected by the pickup head 24 and supplied to the timing signal generation circuit 25. Based on this, a timing signal generated by the timing signal generation circuit 25 is supplied to the address counter 22. Note that the timing signal from the timing signal generation circuit 25 is also supplied to an identification signal generation circuit 26 and an encoder 33, which will be described later. Further, the timing signal generation circuit 25 is supplied with a shutter button operation signal from a terminal 27, which is generated by operating a shutter button (not shown).

First, the audio signal converted into a digital quantity by the A/D conversion circuit 13 according to the sampling signal from the oscillator 21 is stored in the memory 14 using the sampling signal as a clock.
will be written to. At this time, as shown in FIG.
1 segment) is written to the memory 14. The written signal is then read out from the memory 14 at a speed 640 times faster than writing, as shown in FIG. 3B, in accordance with the signal from the oscillator 23 in this embodiment.

In other words, the audio signal for 2.5 seconds is 1/640 (2,
This means that the time axis has been compressed to 5/6/IO-'3.981 seconds). This time-base compressed audio signal is the first
S corresponds to the audio signal in the figure. Also, at the time of reading, each segment SA, S on disk D, which will be described later.
The respective audio signals ASA, 8SR, ASc, and AsD corresponding to B, Sc, and SD are as shown in FIG.
Based on a pulse signal with a period of 1/6° from the pickup head 24, 174 cycles (1
/240 seconds) at sequentially shifted timings.

The audio signal read from the memory 14 is converted into an analog -9-^ quantity by the D'/A conversion circuit 15 and supplied to the mixing circuit 16, as described above. Further, the mixing circuit 16 is supplied with a start identification signal SID and an end identification signal EID generated by an identification signal generation circuit 26 based on a timing signal from a timing signal generation circuit 25. Further, the mixing circuit 16 is supplied with an information signal API via an encoder 33 for controlling the reproduction operation of the audio signal generated by the information signal generation circuit 32 based on the control signal from the system controller 31. be done. Then, each signal is mixed in the mixing circuit 16 to form a signal as shown in FIG. FIG. 1 shows a signal for one segment of time ts.2, a start identification signal SID is placed at the front end of a time-base compressed audio signal As, and an end identification signal EID is placed at the rear end. , an information signal API for controlling the reproduction operation of the audio signal is placed at the rear end of the end identification signal EID at a predetermined time interval. Also, the time 1. of the audio signal As. If the time is shorter than the predetermined time (2,5/640 seconds), the positions of the end identification signal EID and the information signal API are shifted to the left in the figure accordingly, and the information signal API is The subsequent time t2 is made longer. That is, time 1 of the audio signal As
．． and the time t2 after the information signal A lJ l are made equal.

Here, each identification @ @ S ID , E ID
has a shape that can be distinguished from the audio signal As. for example,
A pulse can be distinguished if it has a longer pulse width W than the pulse corresponding to the lowest frequency of the time-base compressed audio signal As. For example, as shown in the figure, the start identification signal SID has positive polarity and its falling edge is used as a reference, and the end identification signal EID has negative polarity and its rising edge is used as a reference.

Further, the information signal API is composed of, for example, 64 hits, and is composed of data such as a trunk address, a continuous voice start address, a continuous voice succeeding address, a corresponding image address, a time compression rate mode, and a segment usage state. The track address data represents the absolute address of the track where the signal is recorded. The data at the continuous audio start address indicates the start track address when a continuous series of audio is recorded across multiple tracks, and the data at the continuous audio subsequent address similarly indicates the track address to be played next. It represents. The corresponding image address data represents the track address where the image signal corresponding to the recorded audio signal is recorded, and the time compression rate mode data represents the compression rate of the recorded audio signal (e.g. 1.
/ 640.

1/1280, etc.). The segment usage status data is the usage status of each segment divided into four equal parts (
For example, it represents stereo mode, bilingual mode, etc.). In addition, each segment S within one track
The same information signal API is recorded in A, Sn, Sc, and 8n.

The signal from the mixing circuit 16 is sent to the FM modulation circuit 5 via a pre-emphasis circuit 17 with linear characteristics and a changeover switch 4. The FM modulation circuit 5 converts the signal into an FM signal, and the magnetic head 6 records the signal on the disk D. At this time, each audio signal ASA, As B, A for 2.5 seconds
s c , As o, identification signals SID and EID added to each, and information signal API are shown in FIGS. 5 and 6.
As schematically shown in the figure, one track on the disk D is divided into four equal segments, and the data is recorded in each of the segments SA, SB, Sc, and Sn, respectively.

Next, the playback device will be explained. FIG. 7 is a block diagram showing a reproducing apparatus in this embodiment.

In FIG. 7, a signal reproduced from a disk D by a magnetic head 41 is supplied to an FM demodulation circuit . When the magnetic head 41 is scanning a trunk on which a video signal is recorded, the demodulated signal is taken out as a video signal from an output terminal 45 via a de-emphasis circuit 43 and a reproducing circuit 44 with non-linear characteristics.

When the magnetic head 41 is scanning a track on which an audio signal is recorded, the demodulated signal is supplied to an A/D conversion circuit 52 via a de-emphasis circuit 51 with linear characteristics, and an identification signal is detected. The signal is supplied to a circuit 61 and an information signal detection circuit 62. The start identification signal 8ID and end identification signal EID detected by the identification signal detection circuit 61 are sent to the timing signal generation circuit 63.

The end identification signal EID is also sent to the information signal detection circuit 62, and an information signal API is also sent to the information signal detection circuit 62 to control the reproduction operation of the audio signal detected by the information signal detection circuit 62 at a timing based on the end identification signal EID. The signal is sent to the timing signal generation circuit 63. Also, information signal API
is also supplied to a system controller 64, which controls the entire device.

The audio signal converted into a digital quantity by the A/D conversion circuit 52 is written into the memory 53. Then, the signal read from the memory 53 is sent to a D/8 conversion circuit 54 and converted into an analog quantity. Here, a signal having a frequency equal to that of the oscillator 23 described above is transmitted from the oscillator 65 to the D/D conversion circuit 5.
2 and is also supplied to an address counter 66 that drives and controls the memory 53. Further, a signal having a frequency equal to that of the oscillator 21 described above, that is, a signal having a frequency of 1/640 of the signal output from the oscillator 65 is supplied from the oscillator 67 to the D/A conversion circuit 54, and the address counter 66. Furthermore, 17 from the pickup head 68
A timing signal based on a pulse signal having a period of 60 seconds is generated by a timing signal generation circuit 63 and supplied to the address counter 66.

That is, for example, when a falling edge of the start identification signal SID is detected, as shown in FIG. Writing continues in response to signals from.

Then, when the rising edge of the end identification signal EID is detected, writing is stopped. Reading is performed at the writing speed of 17640 in accordance with the signal from the oscillator 67. In other words, the operation is completely opposite to that during recording.
This means that the audio signal has been expanded 640 times in the time axis direction and returned to its original length.

Note that the address of the memory 53 is returned in response to the end identification signal EID. By repeating this operation for each segment, the portion of the audio signal As of each segment is continuously written into the memory 53.

Furthermore, if the audio signal between each segment is recorded with an overlap, when returning the address of the memory 53, the address of 14+α (overlap portion) is returned. This makes it possible to prevent discontinuities from occurring due to jitter components and the like.

The signal from the D/A conversion circuit 54 is taken out as a continuous audio signal from an output terminal 56 via a decoder 55 for noise reduction.

The identification signal detection circuit 61 in this reproducing apparatus may have a structure different from that shown in FIG. 8, for example.

That is, the signal from the de-emphasis circuit 51 (the ninth
A) is supplied via an input terminal 71 to a differentiating circuit 72 for detecting a falling edge, a differentiating circuit 73 for detecting a rising edge, and a low-pass filter 74. A signal as shown is extracted.

The signals extracted by the low-pass filter 74 (D in FIG. 9) are supplied to comparison circuits 75 and 76 having detection levels indicated by ia and b, respectively.
Signals as shown in Figures E and F are extracted.

These signals are respectively supplied to AND circuits 77 and 78, and the signals from differentiating circuits 72 and 73 are supplied to the AND circuits 77 and 78.
are supplied to circuits 77 and 78, respectively. And AND
The start identification signal 5ID (falling edge) is detected by the circuit 77, and an output signal as shown in FIG. 9G is obtained at the output terminal 79. Further, the end identification signal BID (rising edge) is detected by the AND circuit 78, and an output signal as shown in FIG. 9H is obtained at the output terminal 80.

As mentioned above, the information signal API for controlling the playback operation of the audio signal includes the track address, the continuous audio start address,
It consists of data such as the continuous audio succeeding address, the corresponding image address, time compression rate mode, and usage status of the segment. By recording this information signal API in each segment together with the audio signal, the following information is generated. Effects can be obtained.

For example, even if an audio signal is recorded across multiple tracks, it is possible to distinguish between an image track and an audio track during playback, and it is possible to playback audio corresponding to a ≠1 image. - For example, as shown in FIG. 10, when a video signal is recorded on track T1 and the corresponding audio signal is recorded on tracks T2 to T4, each track (4 segments) is recorded as an information signal API. In addition to the track addresses "2 to 4" and the corresponding image address "1", data such as a continuous audio start address and a continuous audio succeeding address may be recorded simultaneously. Truck T2
The consecutive audio start addresses of ~T4 are all "2".

Regarding the continuous audio subsequent address, track T2 is "3",
Track T8 is "4" and track T4 is "0", for example.
It is. As a result, during reproduction, the magnetic head 41 is sequentially sent to tracks T2-Ta-T4. In addition,
By setting the continuous audio succeeding address of track T4 to 12'', it is also possible to endlessly reproduce the audio signals recorded on tracks T2 to T4. Furthermore, when an audio signal is recorded on only one track, endless reproduction can be performed by setting the address of that track as the subsequent address of continuous audio.

Furthermore, even when continuous shooting is performed, audio signals corresponding to each image can be recorded and played back. In this case, for example, as shown in FIG. 11, the audio signals A-8A and 1y8B corresponding to the image are recorded up to the middle of segments t and sA and segment SB, and the remaining segments I and Sc and Sn are It is considered a dummy segment. In segment SH, immediately after the audio signal NSB is interrupted,
An end identification signal EID and information signals A and PI are recorded. In this case, data such as track address, corresponding image address, continuous audio start address, continuous audio succeeding address, etc. are recorded in each segment SA-8D as the information signal API.
Of course, it will be done. During reproduction, the magnetic head 41 is moved when the end identification signal EID and information signal API of the segment SB are detected, and the track corresponding to the next image is reproduced. Such a signal recording state is applied not only to continuous shooting but also to cases where the audio corresponding to one image is as short as 10 seconds or less in normal shooting.

This eliminates the need for unnecessary playback operations.

Furthermore, among the four segments of one track, for example, segments SA and Sc are set to the right 1) channel, segment S.
It is also possible to record and play back in stereo with B and Sn as the left (L) channel, and segments SA and Sc can be recorded and played back in stereo.
Japanese, segment SB.

It is also possible to perform so-called bilingual recording and playback by setting S11 to English. It is also possible to record and reproduce four channels by using each of the segments SA to SD independently. In this case, the data on the usage state of the segment, which is one of the information signal APIs, may be different from that in the case where continuous audio is recorded in each segment.

Furthermore, the compression rate of the audio signal may be doubled, for example, to 1/1.
280, and the recordable time on one track can be set to 20 seconds. In this case, data in time compression rate mode, which is one of the information signal APIs, is
It may be different from the case of 640.

〔Effect of the invention〕

According to the recording device of the present invention, the start identification signal, the end identification signal, and the information signal for controlling the playback operation of the audio signal are recorded in each segment on the disk together with the time-axis compressed audio signal. Therefore, even if the audio signal recorded on one track is shorter than the predetermined time, no wasteful playback operation is performed. Furthermore, even when audio is recorded across multiple tracks or when continuous shooting is performed, audio corresponding to images can be played back. Furthermore, it is extremely versatile, allowing stereo playback, bilingual playback, etc.

[Brief explanation of drawings]

FIG. 1 shows a signal 21- related to audio recorded in one segment in an embodiment of the recording apparatus according to the present invention. FIG. 2 is a block diagram showing the recording device of the above embodiment, FIG. 3 is a time chart 1 showing the compression state of the audio signal, and FIG. 4 is a waveform diagram showing the audio signal written in the memory. FIG. 5 is a plan view of the disk showing each segment into which one track is divided into four equal parts, FIG. 6 is a plan view of the disk schematically showing the signals recorded in each segment, FIG. 7 is a block diagram showing the reproduction device in the above embodiment, FIG. 8 is a block diagram showing an example of the identification signal detection circuit in the reproduction device, and FIG. 9 is the operation of the identification signal detection circuit shown in FIG. 8. Figure 10 is a plan view of a disc showing an example of the case where audio signals are recorded across multiple tracks, and Figure 11 is a time chart for explaining how audio signals are recorded on one track on the disc in the case of continuous shooting. FIG. 3 is a plan view of a disk schematically showing signals generated by the disc. SA, SB, 5C2SD...Segment As・
......Audio signal SID......Start identification signal = 22-

Claims (2)

[Claims] (1) In a recording device that sequentially records one field of video signal as one track concentrically, the track is divided into a plurality of segments, and the audio signal is time-axis compressed in each segment. When recording, a start identification signal and an end identification signal are arranged and recorded at the front and rear ends of the time-axis compressed audio signal recorded in each segment, and either the start identification signal or the end identification signal is recorded. 1. A recording device characterized in that an information signal for controlling a reproduction operation of an audio signal is arranged and recorded at a predetermined time interval on one rear end. (2) The recording device according to claim 1, wherein the position of the end identification signal and the information signal for controlling the reproduction operation of the audio signal is variable within one segment.