JPS63255871A - Voice recording method in image recording device - Google Patents

Abstract

PURPOSE:To improve the using efficiency of a recording medium by taking priority over the recording of a video signal more than the recording of a voice signal. CONSTITUTION:When the recording timing of the video signal occurs earlier when a voice signal over the recordable voice signal time to the track of a recording medium 10 is fetched into a memory 36 for compressing the time of the voice signal, the recording of the video signal is executed in priority to the recording of the voice signal, and when the voice signal of a prescribed quantity is fetched into the memory 36, the voice signal of the memory 36 is recorded to the recording medium 10. Thus, many voice signals can be efficiently recorded to a recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio recording method in an image recording device.

[Conventional technology]

Conventionally, in an image recording device that records one field's worth of video signals on each track provided concentrically on a magnetic sheet, time compression is required when audio signals related to the video signal are recorded on the same magnetic sheet. The corresponding video signal track number (address) and time axis compression ratio are added to the recorded audio signal and recorded on a track different from the recording trunk of the video signal. During reproduction, these additional data are used to expand the time of the audio signal and reproduce the corresponding video signal.

The time compression of audio signals is 320 times, 640 times, and 1°2.
Three types of 80 times are usually used, and the actual time of recorded and reproduced audio signals is set to be approximately 5 seconds, 10 seconds, and 20 seconds, respectively.

[Problem to be solved by the invention] Although it is possible to record voice signals for about 5 to 20 seconds on a single track, conventional devices record images at a rate of, for example, one image every 0.5 seconds. (
In other words, in the case of continuous recording at a rate of 2 frames per second), 0.0.
An audio signal equivalent to 5 seconds is recorded on one tracker in accordance with the recording of the video signal. That is, although there is a voice signal recording capacity of about 5 to 20 seconds, only about 1/10 of it is used, which is extremely uneconomical.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an audio recording method that more efficiently utilizes tracks for recording audio signals.

[Means for solving problems]

An audio recording method in an image recording device according to the present invention is a method for recording audio related to a recorded image on a recording medium in an image recording device that records a video signal on a recording medium having a plurality of concentric tracks. Therefore, the audio signal for the audio signal time that can be recorded on the track of the recording medium is captured into the audio signal time compression memory earlier than the audio signal is captured into the audio signal time compression memory. The present invention is characterized in that the video signal is recorded in the memory, and the audio signal in the memory is recorded on the recording medium at the time when a predetermined amount j of audio signals are taken into the memory.

[Effect]

As described above, by prioritizing recording of video signals over recording of audio signals, more audio signals can be recorded on one track, and the efficiency of use of the recording medium is greatly improved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic block diagram of an image recording apparatus to which the method of the present invention is applied, and FIGS. 2, 3, and 4 show flow charts of its control program.

In FIG. 1, reference numeral 10 denotes a magnetic sheet having 50 concentric tracks, each of which can record one field's worth of video signals or a predetermined amount of audio signals. In this embodiment, the first track is at the outermost circumference and the fiftieth track is at the innermost circumference. 12 is magnetic sheet 1
A DC motor 14 rotates the motor 12, and a servo circuit 14 controls the rotation of the motor 12. 16 is a PC coil that detects the rotational phase of the magnetic sheet 10; 17 is a sync separation circuit that separates a sync signal from the input video signal; and the servo circuit 14 receives pulse signals from the PG coil 16 and sync separation circuit 17 The magnetic sheet 10 is controlled to a desired rotational state by the synchronization signal. A magnetic head 18 magnetically records signals on the tracks of the magnetic sheet 10 or reproduces signals recorded on the magnetic sheet 10. 20 is a magnetic head 18
a moving mechanism for moving the magnetic sheet in the radial direction of the magnetic sheet 10;
2 is a drive circuit that drives the moving mechanism 20.

In the illustrated embodiment, the magnetic head 18 is used both for recording and reproducing video signals and recording and reproducing audio signals, 24 is a switch for switching between recording and reproduction, and 26 is a switch for recording audio signals and recording video signals. This is a switch for switching between switch 2
4 is connected to the contact 24a side during reproduction, and connected to the contact 24b side during recording. The switch 26 is connected to the contact 26a side when recording a video signal, and connected to the contact 26b side when recording an audio signal.

28 is a video signal processing circuit that performs signal processing such as FM modulation for recording on a video signal input (for example, from an image sensor). 32 is a microphone; 34 is an A/D converter that converts the audio signal from the microphone 32 into a digital signal; 36 is an audio memory for temporarily storing and time-compressing the digital audio signal; 38 is a D/A converter; Reference numeral 40 denotes an audio signal processing circuit that performs signal processing for recording and adds information such as the time compression rate of the audio signal and the track number on which the corresponding video signal is recorded. The output of the audio signal processing circuit 40 and the output of the video signal processing circuit 28 are applied to the magnetic head 18 via the switch 26, the recording amplifier 30, and the switch 24.

In the illustrated apparatus, whether or not each track of the magnetic disk 10 has been recorded is checked at the time of initial operation, and the reproduction amplifier 42, envelope detector 44, and comparison circuit 46 are circuits that perform this check. That is, the output of the envelope detector 44 is the comparison value V? ) I, the track has been recorded, and the comparison circuit 46 outputs a signal to that effect.

48 is a CPU that controls the overall operation of the illustrated device;
For example, it consists of a microcomputer, a ROM that stores its operating program, a RAM that stores control variables, and the like. Specifically, the CPU 42 controls the conversion speed of the A/D converter 34, the successive output (R) and writing (W) of the audio signal memory 36.
, and supplies the audio signal processing circuit 40 with information on the time compression rate and the recording track number of the corresponding video signal. As will be described later, the CPU 48 also receives the output of the comparison circuit 46 and reads the recorded flag of the RAM 48A.
The results are stored in the table and the drive circuit 22 is instructed to move the head.

50 is a switch for instructing recording standby operation, 52 is a recording switch for instructing recording operation, 54 is a continuous shooting setting switch for instructing continuous recording of video signals, and 56 is an audio recording mode switch for instructing audio recording. , CPU4
8 executes control operations according to these switch states, as will be described later.

Next, the operation of the illustrated device will be explained. When the magnetic sheet 1O is loaded and the power is turned on, the CPU 48 starts up and executes the initial setting operation shown in FIG. That is, by turning on the power or replacing the magnetic sheet 10 (s2-1), the CPU 48 causes the magnetic head 18 to access the last track (50th rack). During this initial setting operation, the switch 24 is connected to the contact 24a side, and the CPU 48 determines from the output of the comparison circuit 46 whether or not the track being accessed has been recorded (S2-3). If recorded, RA in CPO48
Set the recorded flag of M48A, and clear the recorded flag if it is not recorded. This is repeated until the first track is reached (S2-6.7).

By the initial setting operation shown in FIG. 2, information about which tracks of the loaded magnetic sheet 10 are unrecorded is transferred to
Stored in M48A's flag table.

After the initial settings according to the flow shown in FIG. 2, recording of video signals or recording of video signals and audio signals is performed depending on the states or switching operations of the recording standby switch 50, recording switch 52, and audio recording mode switch 56. conduct. FIG. 3 shows the flow chart. In addition, in FIG. 3, it is assumed that the corresponding audio signal is recorded in the next track of the video signal recording trunk. Further, N indicates the number of the track that the head 18 attempts to access or is accessing.

When the closing (on) of the recording standby switch 50 is sensed (S3-1), the CPU 48 sequentially increments N from 1 to 50, and refers to the flag table to select the unrecorded track with the lowest track number. The head 18 is positioned at (S3-2.4.5). If there are no unrecorded tracks, recording is impossible and ends. In this case, an LED may be turned on or a buzzer may be emitted to notify the operator that there are no unrecorded tracks on the magnetic sheet 10. When an unrecorded track is discovered (S
3-3), check the audio recording mode switch 56 (S3
-6), if it is on, it is checked whether the next (N+1)th track is also unrecorded (S3-7). That is, when audio signals are also recorded, two consecutive tracks need to be unrecorded. If the (N+1)th rack has been recorded, increase N. S3-4), consecutive 2
You will find a place where two tracks are unrecorded. If the (N+1)th track is unrecorded, the CPU starts importing the audio signal into the memory 36 (S3-8).
48 causes the drive circuit 22 to access the head 18 to the Nth track (S3-9).If the audio recording mode switch 56 is off (S3-6), recording of the audio signal is not necessary, so the head 18 is accessed to the Nth track (S3-9). (N+1)) The head 18 is made to access the Nth trunk regardless of whether or not the rack is unrecorded (S3-9).

After 53-9, the recording switch 52 is checked, and if it is on, the video signal is recorded on the Nth track (53-11), and if it is off, the process returns to 53-1 and the above routine is repeated. S
In step 3-11, a video signal is recorded as follows. That is, the switch 26 is connected to the contact 26a side, and the switch 26 is connected to the contact 26a side.
4 is connected to the contact 24b side only during the recording period, and the output signal of the video signal processing circuit 28 is applied to the head 18. In the illustrated embodiment, in order to record one field of video signals on one track, the magnetic sheet 10 is rotated at 3,600 revolutions/second, and the switch 24 is held at the contact 24 for 1760 seconds.
Connect to side b. After this recording, the head 18 is moved inward by one track (N=N+1).

In step 53-12 following S3-11, it is checked whether or not the mode is set to measure the time taken into the audio memory 36.
If it is not in that mode, the recordable time T of the audio signal
Set the timer T/2, which is half of This is because the stored signal in the memory 36 is written in one track of the magnetic sheet 10 in 1760 seconds after T/2 hours have elapsed, thereby recording the audio before and after the video signal is recorded in the same time ratio. S3-12.13 then S
Proceeding to 3-14, a routine (S
3-15 and subsequent steps), or the routine proceeds to a routine for recording video and audio signals (S3-19 and subsequent steps).

In S3-15, the continuous shooting setting switch 54 is checked, and if it is off, the process ends, and if it is on, it is checked by the flag table whether or not the Nth track is unrecorded (S3-16). No. N
If the track is unrecorded, wait for the time that defines the continuous shooting interval (O0゛5 seconds in the illustrated example) (S3-17)
, then if the record switch 5'' is off, it ends,
If it is on, the process returns to S3-11 and video signal recording is executed. This continuous recording continues as long as switch 52 is on, until a recorded track is accessed or the last trunk (track 50) is reached.

In the routine that also records audio signals, in S3-19, it is checked whether the timer for measuring the input into the audio memory 36 has elapsed the set time, and if the time has elapsed, the contents of the memory 36 are read out. recorded on the magnetic sheet 18, and
is incremented and sets time T in the timer (S3
-20). The audio recording operation is performed by reading out the stored signal in the memory 36, setting the switch 24 to the contact 24b side, and switching the switch 2 to the contact 24b side.
6 to the contact 26b side. At this time, the audio signal processing circuit 40 adds the trunk number and audio compression rate of the video signal whose recording has started to the audio signal from the D/A converter 38. If the time has not elapsed in S3-19, and after S3-20, it is checked whether the (N+1)th track inside the currently accessed Nth track is unrecorded (S3-21).

If the data has been recorded, the process advances to S3-22; if the data has not been recorded, the process advances to S3-23.

In S3-22, it is checked whether recording of the audio signal has ended or not, and if it has not ended, the process returns to S3-19, and if it has ended, time measurement in the audio memory 36 is stopped and the operation ends. (S3-24), In S3-23, it is checked whether the continuous shooting switch 54 is on or off, and if it is not continuous shooting, S3
-22, and if continuous shooting, the process advances to S3-25.

In S3-25, it is checked whether or not the continuous shooting interval time (0.5 seconds) has elapsed, and if it has not elapsed, 33-25 is checked.
Return to step 19, and if the time has elapsed, check the recording switch 52 for recording the next video signal (S3-26);
33-11 if the switch 52 is on in S3-26
The process returns to step 33-22 to record the video signal, and if it is off, there is no need to record the video signal, so the process proceeds to step 33-22 for audio signal recording processing.

To summarize the above, if the audio recording mode is not set, only the video signal is recorded.

If the continuous shooting (continuous recording) mode is not set, recording ends with one field of video signal, but when the quick shooting mode is set, the record switch 50
is on and the video signal is recorded at every predetermined recording interval until the recorded trunk is reached.

If the audio recording mode is set, the following will occur depending on whether or not the continuous shooting mode is set. That is, when not in continuous shooting mode, in addition to recording the video signal, audio signals before and after the video signal are recorded in tracks adjacent to the video signal recording track for each half of the recordable time of the audio signal. On the other hand, in continuous shooting mode, similarly, the audio signals before and after the first video signal are recorded are 1/1/2 of the recordable time.
However, if the continuous recording interval time is shorter than 1/2 of the available audio recording time, priority is given to continuous recording of the video signal, and recording starts when the audio capture time has elapsed for a predetermined time. Record audio.

Further, even when giving priority to continuous video recording, if the track on which audio is to be recorded has already been recorded, continuous video recording is terminated, so there is no possibility that audio recording will not be performed.

Furthermore, after the audio recording is finished in S3-20 in FIG. 3, the recordable audio time T is set in the timer that measures the time taken to capture the audio into the audio memory 36, so in the case of continuous video recording. (In the above embodiment, the audio is recorded on the adjacent track of the video signal recording trunk.) However, the video signal may be recorded on the innermost track of the magnetic sheet 10 in order from the outermost track, and the audio signal may be recorded on the outermost track in order from the innermost track. If you are recording only the video signal, or if you are also recording the audio signal and want to play back only the video signal,
This has the advantage that the video signal can be played back by a playback device that does not have an audio signal playback function. Figure 4 shows a flowchart for this purpose.A variable M is provided to specify the trunk for recording the audio signal, and a check is made to ensure that the audio signal recording trunk and the video signal recording trunk do not overlap. Except for this point, the basic operation is the same as in the case of FIG. Specifically, parts 54-1 to 54-10 are added or changed.

Further, in the above description, field recording using one track for recording a video signal was taken as an example, but the present invention can also be applied to frame recording and cases where field recording and frame recording are mixed. It goes without saying that the track on which the audio signal is recorded may be any unrecorded trunk.

Furthermore, although the device shown in FIG. 1 uses a single head 18 to record the video signal and audio signal, separate heads may be used, and using separate heads would be better in terms of device cost. Although it is somewhat disadvantageous, it is advantageous in terms of head access time.

In the illustrated embodiment, the recording timing of the audio signal is determined by a timer that measures the acquisition time of the audio signal, but when it is detected that the audio memory 36 is filled with audio data,
Audio recording may be performed in response to the detection signal. However, in this case, instead of setting T/2 to the timer in S3-13, 1/2 of the audio memory 36 is cleared, and S3
-20 will clear all of the memory 36 instead of setting the timer to T.

〔Effect of the invention〕

As can be easily understood from the above explanation, according to the present invention, more audio signals can be efficiently recorded on a recording medium.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of an image recording apparatus to which the present invention is applied, and FIGS. 2, 3, and 4 are flow charts of its operation. 10...Magnetic sheet 12...DC motor 14
−・−・Servo circuit 16・−PG coil 17・・−
Synchronous separation circuit 18--Magnetic head 20--Movement mechanism 22--Drive circuit 24.26--Switch 28
−・−Video signal processing circuit 3〇−Recording amplifier 32・−
Microphone 34-・-A/D converter 36-・・
-Memory 38--・D/A converter 40--・-・
Audio signal processing circuit 42-- Reproduction amplifier 44-
Envelope detector 46-・Comparison circuit 48-・CPU
50-Recording standby switch 52-...Recording switch 54...Continuous shooting setting switch 56...
・Audio recording mode switch Fig. 1 Fig. 2

Claims (1)

[Claims] A method for recording audio related to a recorded image on the recording medium in an image recording device that records a video signal on a recording medium having a plurality of concentric tracks, the method comprising: recording the audio related to the recorded image on the recording medium; If the recording timing of the video signal occurs earlier than the audio signal over the recordable audio signal time is captured on the track of the medium,
An image recording device characterized in that recording video signals is given priority to recording audio signals, and when a predetermined amount of audio signals are captured in the memory, the audio signals in the memory are recorded on the recording medium. Audio recording method.