JPS6272285A - Reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce an audio signal by constituting that addresses of a memory are formed in a ring so as to use a recording and reproducing device for a still picture. CONSTITUTION:Audio tracks A1, A2 are provided in accompanyment with a video track V and the signal on the audio tracks A1, A2 is reproduced while the video track V is subjected to repetitive reproduction of still picture. An end detection signal of a signal period of the audio tracks is fed to a system control circuit 55 and then a magnetic head 31 is moved to a video track V. Then the head is moved to the next audio track by a signal from a comparator circuit 60 and restores again to the video track V by an end detection signal during the audio track signal period. Thus, the signal on the audio tacks A1, A2 is reproduced with time axis expansion while the signal on the video track V is subjected to still picture reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to recording and reproducing audio signals using a recording and reproducing device for various still images of a so-called electronic still camera device.

[Summary of the invention]

The present invention provides an apparatus for reproducing a signal by expanding the time axis,
By configuring the memory address in a gold ring shape,
This ensures that continuity of reproduction signals between tracks is maintained.

[Conventional technology]

An electronic still camera device that has an imaging device such as a CCD and records the signal of one arbitrary field or one frame on a magnetic disk has been proposed (Utility Model Application No. 57-1999).
No. 197,021, etc.).

In other words, in such a device, one field or one frame of the video signal from the imaging device is gated and extracted at the time of arbitrary shutter operation, and one field of this signal becomes one annular track. recorded on a magnetic disk. Note that one frame of signal is recorded using two tracks. Therefore, in this device, a video signal of a still image can be formed by repeatedly reproducing one track or two tracks alternately.

It has been proposed to provide such devices with the additional possibility of recording audio signals. for that? For example, one possible method is to use digital signal processing technology to compress the audio signal's time axis, raise the frequency band of the audio signal to the band of the video signal, and record it using the same recording system as the video signal. In this case K, for example, by compressing the time axis by 600 times the audio signal i up to 5 kHz, it becomes 3 MHz.
can be converted into a video band signal. In this case, the entire audio signal for about 10 seconds, which is 600 times as long, can be recorded in one field period (1/60 second).

That is, FIG. 4 shows a block diagram of an example of such a recording device. In this diagram, the video signal is input to the input terminal (1).
is supplied to the recording circuit (2) and set to a predetermined recording bias,
It is supplied to the FM modulation circuit (5) through a pre-emphasis circuit (3) with non-linear characteristics and a changeover switch (4).
The signal is recorded as an FM signal on the disk D by the magnetic head (6).

In addition, the audio signal is supplied to the input terminal αυ, and passes through the noise reduction encoder circuit (2) to the AD conversion circuit (
2). This digitally converted signal is supplied to the memory device α4. Further, a sampling signal of an audio signal in a band of 5 kHz is generated by an oscillator, and this signal is supplied to an address counter (a) K that drives an AD conversion circuit (to) and a memory device α4.

Furthermore, the oscillation frequency is 600 times that of the above-mentioned oscillator ◇,
An oscillator (1) is provided, and a signal from this oscillator (2) is supplied to an address counter (2).

Further, a magnetic piece provided at a predetermined portion of the disk D is detected by a pick amplifier head (Incorporated), and a detection signal related to the rotational phase of the disk D is supplied to the memory controller (1). For example, immediately after this detection signal, the signal written in the memory device α→ is read out 600 times faster.

This read signal is supplied to the DA conversion circuit (g). A signal from an oscillator is also supplied to the converter circuit a. This analog-converted signal is then supplied to an FM modulation circuit (5)K through a pre-emphasis circuit αQ with linear characteristics and a changeover switch (4), where it is converted into an FM signal and recorded on a disk D by a magnetic head (6)K. be done.

In this way, the audio signal can be compressed on the time axis and recorded on the disc D using the video signal recording system.

However, in such a device, the above-mentioned 10 seconds may not be long enough for the audio signal to be recorded. Therefore, in that case, it is accepted as a standard to use a plurality of tracks on the disk D and to sequentially record all signals on them.

However, when reproducing an audio signal from a disc D recorded in this way, a conventional device equipped with only one element with a capacity equivalent to one track as a memory for time axis expansion cannot reproduce the - track. There is a gap time after the time axis expansion readout until the writing of the next track is completed and the continuous recording starts, and no reproduced audio signal can be obtained during this time.

Therefore, the reproduced sound becomes temporarily silent, and such silence during reproduction is extremely inconvenient for the reproduction apparatus.

Furthermore, in such a playback, if a video signal track is provided and the audio signal is played back while displaying a still image from this video track, the video track is read out after time axis expansion reading of the - audio track. The time it takes for the fake head to access the next audio track by playing back the audio track is added to the above-mentioned free time, resulting in more silent time. Note that even if the display of a still image is slightly interrupted, there is no peak.

On the other hand, it is conceivable to provide two or more memories and use them alternately to perform the full time axis expansion, but providing two or more memories would complicate the circuit configuration, and switching between memories etc. control will also become difficult.

[Problem that the invention seeks to solve]

Conventional devices were constructed as described above. For this reason, when reproducing an audio signal spanning multiple tracks, there is a problem in that the silent period is lost.

[Means for solving problems]

The present invention provides a memory (c) for time-axis expansion of the audio signal when the audio signal is time-axis expanded and reproduced from a medium in which the audio signal is time-axis compressed and recorded on a plurality of tracks. capacity for one of the above trucks (
EFFF) is slightly &te more ((FFFF')), and the address (counter wheel (b)) of the memory is configured in a circular manner, and all of the arbitrary tracks are traced with a single head (3), The first signal extracted by this trace is written in the memory, the written signal is expanded on the time axis and read out, and this readout is performed starting from the end (EFFF) of the write range of the first signal. Before quantitative determination (go
Based on this detection, the first head traces the entire next track, and the second signal extracted by this tracing is placed at the end of the first signal in the memory. This is a playback device in which data is subsequently written (FOOO) according to the addresses configured in a ring shape.

[Effect]

According to this, by configuring the address of the memory in the form of a ring, it is possible to maintain the continuity of the reproduced signal even when reproducing across a plurality of tracks.

〔Example〕

In FIG. 1, a good signal reproduced from a disk D by a magnetic head 0] is supplied to an F'M demodulation circuit 0.

When the demodulated signal is a video signal, this signal passes through a non-linear de-emphasis circuit (to), a reproduction circuit (b), and a muting circuit (to) to the output terminal (
It is taken out at

Further, when the demodulated signal is an audio signal, this signal is supplied to the AD conversion circuit (9) through a de-emphasis circuit ←1)k having a linear characteristic. This rZotal-converted signal is supplied to the Me% IJ device (6). Further, an excavator Gv having the same frequency as the above-mentioned oscillator is provided, and a signal from this excavator 6 is supplied to an AD conversion circuit (6) and an address counter 6 that controls writing in the memory device (b). Ru. Further, there is provided an excavator Q having nine frequencies equal to the above-mentioned oscillator (c), and a signal from this oscillator Q is supplied to an address counter (b) which controls all reading of the memory device Sakaki.

This read signal is supplied to the DA conversion circuit.

A signal from an oscillator Q is supplied to this conversion circuit.

Is this analog converted signal a noise reduction decoder circuit (g)? is taken out to the output terminal (c).

Further, a reproduction signal from the magnetic head 01 is supplied to a system control circuit (7). This control [1
For example, dragging control of the magnetic head 01) is performed using the magnetic head 2 as a trowel. Further, a signal indicating that the video track has been tracked from the control circuit (2) is supplied to the muting circuit (to), and muting is canceled during this time.

Further, a signal from a pickup head branch similar to the above-mentioned head (2) is supplied to the memory controller 67)K.

Additionally, a signal from the control circuitry indicating that the audio track has been tracked is provided to the controller assistant. Then, after tracking to the audio track, a signal period from the first detection signal to the next detection signal is detected, this signal is supplied to the address counter, and writing into the memory is performed during this period.

Furthermore, the end of the signal period is detected by the controller,
This signal is supplied to the latch circuit, and the address of the counter at that time is latched.

This launched value is supplied to the arithmetic circuit (A), a predetermined value is subtracted therefrom, and this subtracted value is supplied to the comparator circuit (2). The comparison circuit compares the address with the read address from the counter, and when they match, a signal is supplied to the system control circuit.

Also, the value latched by the launch circuit member is supplied to the precent section of the counter. Further counter 6 proverbs (goods)
is constituted by a ring counter that returns to the value corresponding to the first address after the value corresponding to the final address of the memory (6) and continues counting.

In this device, the capacity of memory m is made slightly larger than the data amount of one track's worth of audio signals.

In other words, for example, data for one track is stored in the memory [000
0], ~(EFFF') + (27') As shown in FIG. Provided for.

Note that []8 indicates a hexadecimal value. Furthermore, the terminal address [EFFF] is followed by the first address [0000], so that the address is arranged in a ring shape.

Therefore, in this device, during the signal period detected by the controller (B), the signal from the first audio track, for example, is stored in the memory (G) from [0000''1□ to [:EFFF].
It is written to the address of H, and the next address of this end [”
FOOO% is latched into the latch circuit. As a result, the arithmetic circuit (to) outputs, for example, (Eooo 几).

On the other hand, the signal whose time axis has been expanded is address [:0OOO).

This is followed by number 5. And this read address is [E
OOO] □The comparison circuit... detects this, and this signal is supplied to the system control circuit (to).
Next head 0] so that the second audio track is played
) is moved. Please note that the address [Eooo))1~[E
The time required to read FFF:lH is equivalent to the time required to move the head 0υ.

Furthermore, when this second audio track is tracked and a signal period signal is output from the controller (b),
This signal is written to the memory (to), but at this time, [FOOO] has been reset in the address counter, so the signal is [F'0OO)□~[:DFF'F]
.

is written to the address of The next address (gooO)□ at this end is latched by the latch circuit.

Furthermore, the arithmetic circuit (to) outputs (DOOO).

This operation is repeated to sequentially reproduce signals from multiple audio tracks. And from the counter (goods)
By continuously generating addresses from 0000]1 to [FFFF]H in a ring shape, written signals are successively read from the memory (G).

In this way, the entire time axis of the signal recorded on the disk D can be expanded and reproduced, and at this time, there is no silence in the reproduced sound due to idle time such as head movement, and a continuous reproduced audio signal can be obtained. I can do it.

Furthermore, the above-mentioned apparatus includes an audio track A1 . A2 is provided, and it can also be used when all the signals of the audio tracks A, , A2 are played back while the video track Vf is repeatedly playing still images.

That is, in the above explanation of the operation, the end detection signal of the signal period of the audio track is detected by the system control circuit.
head 0]) is thereby moved to video track V. Then, it is moved to the next audio track by the signal from the comparison circuit (2), and returned to the Eikou track (2) again by the end detection signal of the signal period of this audio track.

In this way, while still images are being played back from the signal of the video track ■, the signal of the audio track A1. The A2 signal can be reproduced with the time axis expanded, and in this case, according to the above-mentioned device, the reproduced sound will not be interrupted even when the head moves. Note that since the video is a still image display, there is little problem even if some interruption occurs.

[Ei gA ladle effect]

According to K, by configuring the memory addresses in a ring-like manner, continuity of the reproduced signal can be maintained even when reproducing across a plurality of tracks.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of the present invention, and FIGS. 2 to 4 are diagrams for explaining the present invention. 0]) is a magnetic head, (6) is an AD conversion circuit, (6) is a memory device, ■ is a l) A conversion circuit, ■ is an output terminal, glue Q is an oscillator, 6 sand is an address counter, time is the system control circuit, and A71 is the memory controller. The iron is a launch circuit, 6O is an arithmetic circuit, and one wheel is a comparison circuit.

Claims (1)

[Claims] 1. When the audio signal is time-axis compressed and recorded on a plurality of tracks from a medium, the audio signal is time-axis expanded and reproduced. The capacity of the memory is made slightly larger than the amount of data for one of the above-mentioned tracks, and the addresses of the above-mentioned memory are configured in a ring shape, and any of the above-mentioned tracks is traced with a single head, and by this tracing, The extracted first signal is written in the memory, the written signal is expanded on the time axis and read out, and the readout is a predetermined amount before the end of the writing range of the first signal. This detection causes the single head to trace the next track, and the second signal extracted by this tracing is transferred to the ring after the end of the first signal in the memory. A playback device that writes according to addresses configured as follows. 2. A video signal for a predetermined period is recorded on a predetermined track, and an audio signal is time-axis compressed and the video signal is repeatedly reproduced from a medium recorded on a plurality of tracks, and the audio signal is time-axis expanded. When playing the audio signal, the capacity of the memory for time axis expansion of the audio signal is made slightly larger than the amount of data for one track of the audio signal, and the addresses of the memory are arranged in a ring shape. , trace any track of the audio signal with a single head, write the first signal extracted by this tracing into the memory, and then trace the track of the video signal with the single head. In addition to the above-described repeated tracing, the signal written in the memory is read out with the time axis expanded, and it is detected that this readout is a predetermined amount before the end of the writing range of the first signal; The detection causes the single head to trace the next track of the audio signal, and the second signal extracted by this tracing is placed in the ring shape after the end of the first signal in the memory. A playback device that writes according to configured addresses, and then repeatedly traces the track of the video signal using the single head.