JPH0657060B2 - After-recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The following description will be given.

A Industrial field of use B Outline of the invention C Conventional technology D Problems to be solved by the invention E Means for solving problems (Fig. 1) F Action G Example (Figs. 1 to 3) ) H Effect of the Invention A Field of Industrial Application The present invention relates to a video floppy after-recording apparatus.

B Summary of the Invention The present invention later records an audio signal on a video floppy that has already been shot. That is, in an after-recording device capable of post-recording (after-recording), an information signal indicating a correspondence relationship between a track on which a video signal is recorded and a track of an audio signal recorded by the after-recording is automatically formed. The data is recorded at a predetermined position by the user to improve the operability of the user.

C Conventional Technology In an electronic still camera, a video floppy is used as a recording medium, but in the case of field recording, a video signal of one field of a subject is recorded on the video floppy as one annular magnetic track, In the case of frame recording, one frame of video signal forms one annular magnetic track for each field period.
Moreover, it is recorded as two adjacent magnetic tracks.

Then, in such a camera, it is considered that the audio signal is recorded on a track different from that of the video signal when the recording switch is further pressed.

In this case, the audio signal has a time axis length of, for example, 1/64.
The track is used in 1/4 units while being recorded with 0 times compression. That is, one track is divided into four sectors, an audio signal of about 2.4 seconds is time-axis compressed and recorded in one sector, and a required number of sectors are used. For example, when recording 14 seconds of voice, it is 14 seconds / 2.4 seconds 5.8, so 6 sectors (1.
5 tracks) are used.

FIG. 4A shows a track TRCK of a video floppy when an audio signal is recorded, which is linearly developed. The track TRCK is divided into the four sectors SCTR as described above by the five space sections SPC1 to SPC5. Then, the signal Ss of the sector SCTR is, as shown in FIG. 9B, the start flag SFLG and the control code CTLC.
And audio data DATA and end flag EFLG in order.

In this case, the flags SFLG and EFLG indicate the presence / absence of audio data DATA, whether the audio data DATA is connected to another track TRCK or sector SCTR, etc., depending on the polarity (vertical direction in the drawing). Further, as shown in FIG. 7C, the control code CTLC is a 1-bit start bit STRT in the 62.6 μs period.
And an 8-bit control word CWRD as one set,
It is a binary code that has 12 sets. The start bit STRT is an inversion of the leading bit (LSB) of the subsequent word CWRD, and the word CWRD has the following meanings and data if W0 to W11 are sequentially set.

Word W0: has a predetermined bit pattern for synchronization.

Word W1: Track on which the code CTLC is recorded
Enter the TRCK number.

Word W2: Recorded sector of a series of audio signals
Among the SCTRs, the number of the track TRCK having the first suctor SCTR is shown.

Word W3: Same as word W2, but next sector SC
The number of the track TRCK having TR is shown.

Word W4: Indicates the number of the track TRCK in which the video signal corresponding to the recorded audio signal (audio data DATA) is recorded.

Word W5: (Unused) Word W6: Data for Specifying Playback Mode, etc. Words W7 to W9: Date of recording of the track,
Month, year Word W10, W11: CRC code for words W0 to W9 Furthermore, the audio data DATA has a period of 3755 μs, and is an analog signal obtained by compressing approximately 2.4 seconds of the original audio signal by 1/640 times. Is. Therefore, if the upper limit of the band of the original audio signal is 5 kHz, the maximum frequency of the data DATA is 3.2 MHz (= 5 kHz × 640 times), which is almost equal to the band of the video signal.

Then, in the sector SCTR, the above signals SFLG, CTLC,
DATA, in which the signal S _s with EFLG are recorded in the state of the FM signal S, as shown in FIG. B, frequency ₁
(= 6 MHz) as a reference, the flag SFLG, _{EFLG: 1} + 50kHz or ₁ -50KHz control codes _{CTLC "0": 1 "1} ": 1 -1MHz audio data _DATA: there is a ₁ ± 1.5 MHz.

When a video signal is recorded, the luminance signal in the video signal is converted into an FM signal and recorded, but the frequency
₁ is a frequency corresponding to the pedestal level when converting the luminance signal into the FM signal. Further, the FM signal based on this luminance signal is also called the FM signal Sf for convenience.

D Problem to be Solved by the Invention By the way, as described above, when simultaneously recording an audio signal while recording a video signal at the time of shooting, the video signal and the audio signal correspond to each other. The number of the track on which the video signal is recorded can be recorded on a part of the track on which the audio signal is recorded, as described above. Therefore, when the playback is performed later, the audio corresponding to the playback screen is recorded. The signals can be played back simultaneously.

However, when recording only the video signal and recording the audio signal with sound effects after shooting, that is, when performing post-recording, the user must input the track number of the video signal. , The operation is complicated.

The present invention is intended to solve such a problem.

E Means for Solving the Problems Therefore, in the present invention, while reproducing the video signal from the video floppy, the audio signal is written in the memory, and the audio signal on the memory is recorded in the video floppy. The video signal reproduced immediately before the recording is regarded as the video signal corresponding to the audio signal to be recorded, and the track number of the video signal is recorded together with the audio signal.

The track of the F-action video signal and the track of the audio signal by post-recording are automatically associated with each other, and the user does not need to be aware of the track number.

G Embodiment In FIG. 1, (1) shows a video floppy, and in this example, as shown in FIG. 2, the floppy disk (1) has a video signal recorded in frame recording on tracks 1 to 20. It is assumed that V _{1 to} V ₁₀ are recorded and nothing is recorded on the 21st track and thereafter. The video signal V ₁
~ V ₁₀ is a standard format signal, ie
An addition signal S of an FM signal Sf that is FM-modulated by the luminance signal Sy and an FM signal Sc that is distributed on the lower frequency side of the signal Sf and that has red and blue color difference signals line-sequentially.
m (V _{1 to} V ₁₀ ).

A pair of magnetic heads (2A) and (2B) are provided for such a floppy (1). In this case, for example, when the head (2A) contacts the first track TRCK, the head (2B) contacts the second track TRCK, so that the heads (2A) and (2B) are adjacent to each other. The positional relationship is selected so as to contact the two tracks TRCK simultaneously and in-line. At this time, the heads (2A) and (2B) are coupled to the motor (3) so that the track position can be arbitrarily changed by the rotation of the motor (3). Although not shown, the magnetic sheet contained in the floppy disk (1) is rotated at a field frequency by a spindle motor.

Furthermore, (4) shows the system controller that controls the overall operation of this device, and (5) shows its operation keys.
(4) is composed of a microcomputer, and various control signals are formed in the syscon (4) according to the operation mode and supplied to respective circuits.

Further, (10) shows an audio signal recording system, and (30) shows a video signal reproducing system.

Then, after-recording is performed according to the timing chart as shown in FIG. 3 in response to the user's key operation.

That is, as shown in FIG. 4A, when the floppy (1) is set in the device at an arbitrary time t ₁ , this is detected by the sensor (6) and the detection output is supplied to the syscon (4). Then, the motor (3) is controlled by the syscon (4),
As shown in FIG. 7B, the head (2A) seeks from the first track TRCK to the 50th track TRCK one track at a time in the period t _{1 to} t ₂ , and at this time,
Playback is performed for each track TRCK, it is checked whether or not a signal is recorded (the check method will be described later), and the directory indicating whether or not the signal is recorded on each track TRCK and the directory are RAM of Syscon (4). Formed within. In this case, it is written in the directory that the video signal Sm (V _{1 to} V ₁₀ ) is recorded up to the twentieth track TRCK. Further, as shown in FIG. 3C, muting is applied to the reproduction system of the video signal Sm during this period t _{1 to} t ₂ .

Then, when the check of the track TRCK and the creation of the directory are completed at the time point t ₂ , as shown in FIG. 3B,
The motor (4) is controlled by the system controller (4) and the head (2A),
(2B) is the first and second track positions,
The video signal Sm (V ₁ ) is repeatedly reproduced from these tracks TRCK. Then, the reproduction signal Sm of the head (2A)
Is the contact P on the playback side of the recording / playback switch circuit (21)
And further supplied to the head changeover switch circuit (32) through the reproduction amplifier (31A), and the reproduction signal Sm of the head (2B) is also supplied through the reproduction amplifier (31B) to the switch circuit.
Supplied to (32). Then, the switch circuit (32) is alternately switched every field period by the control signal from the syscon (4), and the frames recorded on the first and second tracks TRCK from the switch circuit (32). The still video signal V ₁ (Sm) is repeatedly taken out at the frame period.

Then, this signal Sm is supplied to the bandpass filter (33) to extract the FM signal Sf, and this signal Sf is
The luminance signal Sy of the frame still is demodulated by being supplied to the FM demodulation circuit (35) through the limiter (34).
Is supplied to the adder circuit (37).

Further, the signal Sm from the switch circuit (32) is supplied to the low-pass filter (41) to extract the FM signal Sc, and this signal Sc is supplied to the FM demodulation circuit (43) through the limiter (42) to generate red and blue signals. The line-sequential signal of the color difference signal is demodulated, this signal is supplied to the modulation circuit (44) and is converted from the line-sequential signal to a simultaneous signal, and is also converted to the carrier color signal in the MTSC system, and this signal is added The signal is supplied to (37) and added to the luminance signal Sy.
The composite video signal Sv of the system is taken out. Then, this signal Sv is supplied to the amplifier (38), and the muting of the amplifier (38) is turned off by the muting signal MUTE from the syscon (4), and the signal Sv is taken out to the terminal (39). , To the monitor receiver (71). Therefore, as shown in FIG. 3C, after the time t ₂ , the video signal V ₁ (Sm) recorded on the first and second tracks TRCK is displayed on the receiver (71) as a frame still screen. Is played.

Therefore, pressing the dubbing key of the operation keys (5) at any time t _3, which is detected the after-recording mode by system controller (4). In this dubbing mode, the audio signal Sa from the microphone (11) is passed through the terminal (12) and the amplifier (13) to the low-pass filter (14).
To the time axis compression circuit (16) through the recording noise reduction circuit (15). The compression circuit (16) includes, for example, an A / D converter and a signal S.
a pair of memory having one track of a capacity (9.6 sec), respectively, D / A converter is composed of a signal Sa the time t ₂ as shown in FIG. 3 D since the digital signal The data is sequentially written into the memory.

In this case, when the period of the signal Sa is 9.6 seconds (one track) or more, the signals are alternately and continuously written to the pair of memories every 9.6 seconds, and a predetermined memory is written from the unwritten memory. At the timing, reading is performed at 640 times the speed of writing.

Then, in this case, from the time t ₃ 9.6 seconds at any time t ₄ within (one track), release the dubbing key of the key (5), the writing into the memory is terminated, also, The muting is applied to the amplifier (38) from the time t ₄ by the signal MUTE, and the head is driven by the motor (3).
(2A) seeks to the 21st track TRCK, at time t
_When the seek is finished in ₅ , the digital signal written from the memory of the compression circuit (16) in the periods t ₃ to t ₄ is changed to the period t _3.
5 ~t ₆ to read at 640 times the speed at the time of writing, the analog signal is taken out this read signal is supplied to the D / A converter. Therefore, the period t _{3 to} t
The audio signal Sa of ₄ is 1/64 in the compression circuit (16).
0 times is time-base-compressed is taken out as a signal DATA in the period t ₅ ~t _6.

Then, this signal DATA is supplied to the adder circuit (17), and at the same time, predetermined data is supplied from the syscon (4) to the formation circuit (61) to form the signals SFLG, CTLC, EFLG described in FIG. , These signals are supplied to the adder circuit (17),
From (17), signals SFLG, CTLG, DATA, EFL are shown in Fig. 4.
The signal Ss with G is taken out. In this case, as described with reference to FIG. 4, the flags SFLG, EFLG and the control code CTLC are recorded as the audio signal S.
a, and that the still reproduced video signal is the video signal V of the first and second tracks.
_The content indicates that the value is ₁ .

Then, this signal Ss is supplied to the FM modulation circuit (18) to be an FM signal Sf, and this signal Sf is sent to the head (2A) through the recording amplifier (19) and the recording side contact R of the switch circuit (21). Supplied. Therefore, the period t _{5 to} t ₆
Signal DATA in the period t _{5 to} t _{6 in} the state of the FM signal S _f.
The 21st track TRCK (track A in FIG. 2)
It will be recorded in ₁ ).

Then, when the recording is completed at time t ₆ , the motor (3)
The heads (2A) and (2B) are sought by, and contact the next third and fourth tracks TRCK at time t ₇ , and thereafter, the third and fourth tracks are performed in the same manner as at time t _{2 and} thereafter. The frame still reproduction is performed in contact with the signal V ₂ of the track TRCK.

And in the present case, the third and fourth tracks
It is assumed that after-recording is performed for 9.6 seconds or more, for example, 14 seconds (1.5 tracks) on the TRCK video signal V ₂ .

Then, similarly to the time point t ₃ or later by pressing the post-recording key at time t _8, the memory to the signal Sa of the compression circuit from the time t ₈ (16) is gradually written sequentially digitized.

When the time t ₈ 9.6 seconds becomes a predetermined short time before the time t ₉ to elapse, with muting is applied to the amplifier (38) by the signal MUTE, by a motor (3) Head (2A) is next audio It seeks to the 22nd track TRCK which becomes a track. And from time t ₈
At time t ₁₀ after 9.6 seconds, the signal DATA which is time-axis compressed 1/640 times is taken out from the compression circuit (16) as at time t _{5 and} thereafter, and this signal DATA is the third signal DATA. position and the 4 th track TRCK code indicating, for example, be an audio signal of CTLC and flag SFLG, EFLG is that the appended with the signal Ss, further head in the period t ₁₀ ~t ₁₁ is converted to the FM signal Sf ( 2A) is recorded on the 22nd track TRCK (the upper one of the tracks A ₂ in FIG. ₂ ). Note that during the period t _{10 to} t ₁₁ , writing is also performed to the other memory as described above.

When the recording of the audio signal Sa on the 22nd track TRCK is completed at time t ₁₁ , the heads (2A) and (2B) are driven by the motor (3) to the original third and fourth tracks TRCK. When it is sought to, and returns to the third and fourth tracks TRCK at time t ₁₂ , the video signal V ₂ is reproduced again from the third and fourth tracks TRCK by frame still reproduction. Then, the operation after the time point t ₁₂ is
This is the same as after time t ₃ , and when the after-recording key is released at time t ₁₃ , the 23rd track TRCK (the track A in FIG. 2 is followed by the remaining audio signal Sa during the period t _{14 to} t ₁₅₎ .
The lower one of ₂ ) is recorded with a control code CTLC or the like. Then, from the time t ₁₆ , the signal V ₃ of the fifth and sixth tracks TRCK is reproduced by frame still, and thereafter, the video signals of the 19th and 20th tracks TRCK are similarly similarly operated according to the operation of the after-recording key. After-recording is performed up to V ₁₀ .

In addition, the FM signal S by the video signal Sv is added to the track TRCK.
When f is recorded, the demodulation output of the demodulation circuit (35) is a luminance signal Sy having a horizontal synchronizing pulse, and when the FM signal Sf of the audio signal Sa is recorded, the demodulation circuit (35). The demodulated output of is the signal Ss, has flags SFLG, EFLG and code CTLC, and when nothing is recorded, the demodulated output becomes limiter noise.

Therefore, during the period t ₁ ~t _2, presence or absence of the demodulated output is supplied to the discrimination circuit (62) for example the horizontal sync pulse of the demodulation circuit (35), the flag SFLG, EFLG and code each track from the presence or absence of CTLC TRCK Recording signal, track TRCK and sector
The usage status of the SCTR and the like are discriminated and supplied to the syscon (4) to form the above-mentioned directory.

Thus, according to the present invention, when post-recording is performed, the screen being played back at that time is considered to correspond to the sound of the post-recording, and the track on which the screen is recorded is recorded.
Audio track whose TRCK number is used for post-recording
It is automatically recorded in TRCK and the screen and sound are associated with each other. Therefore, the user only has to perform post-recording, does not require any special operation or procedure, and can be easily post-recorded by a person who has little knowledge of this kind of equipment. Moreover, in that case, since the post-recording can be performed while the screen is reproduced, it is easy to use and the appropriate post-recording matching the screen can be performed.

In the above description, if a recording system for the video signal Sv and a reproducing system for the audio signal Sa are added, a deck type recording / reproducing machine can be obtained.

H Effect of the Invention According to the present invention, when dubbing is performed, it is considered that the screen being played at that time corresponds to the sound of the dubbing. The number of the track TRCK recording the screen is automatically recorded on the audio track TRCK used for post-recording, and the screen and the sound are associated with each other. Therefore, the user only has to perform post-recording, does not require any special operation or procedure, and can be easily post-recorded by a person who has little knowledge of this kind of equipment. Moreover, in that case, since the post-recording can be performed while the screen is reproduced, it is easy to use and the appropriate post-recording matching the screen can be performed.

[Brief description of drawings]

FIG. 1 is a system diagram of an example of the present invention, and FIGS. 2 to 4 are diagrams for explaining the same. (1) is a video floppy, (10) is an audio signal recording system, and (30) is a video signal reproducing system.

Claims (1)

[Claims] 1. A reproduction system for reproducing a video signal recorded on a video floppy, a recording system for recording an audio signal on the video floppy, and an operation key for instructing after-recording. When the video signal is reproduced from a predetermined track of the video floppy by the system, when the operation key is operated, the recording system records an audio signal on another track of the video floppy, and An after-recording device in which a code indicating a track that is reproducing the video signal is integrated with an audio signal to be recorded and recorded in the video floppy.