JPS5961380A - Recorder and reproducer - Google Patents

Abstract

PURPOSE:To discriminate the frame and the field recording with a minimum discriminating signal, by recording the 1st or the 2nd discriminating signal attended with the recording of the 1st or the 2nd field at frame recording. CONSTITUTION:An NAND gate 16 outputs ''0'' at the succeeding field of frame recording and a switch 29 is changed over to a head 31. In other cases, the switch 29 is switched to a head 30 side. Further, an analog gate 20 is opened when all circuits 4-7 output ''1'', i.e., an ID switch is applied so as to write an ID signal at the 1st recording at the frame recording and writes the ID signal corresponding to ''1''. Then, an analog gate 21 is opened at the recording of the succeeding field of the frame recording and the ID signal corresponding to ''0'' is written.

Description

[Detailed description of the invention]

The present invention d: relates to a still image recording device and a reproducing device, in particular, recording one field of a television signal per track on a plurality of concentric track carts;
Field recording, in which one field of the 11iTj side is recorded on the l track, and 1 field of the ll1f+i side is recorded on the 2nd track.
In a system that records one frame and can switch frame recording as appropriate, 'I') Automatically distinguishes between field recording and frame recording during playback, and ensures that pairs of fields form a frame during frame playback. The present invention relates to a still image recording device and playback device suitable for full 4M recording. Conventionally, a large number of concentric recording tracks are provided on a magnetic sheet, and a still image recording/reproducing device extracts and records one field of one preview word on the track corresponding to one rotation of the magnetic sheet. It has been known. Such a device records one screen corresponding to one track, so one
It was possible to reproduce any one direction in both directions by placing a -RAD with gaps of 1 and 2 facing an arbitrary track and generating TLF. However, there is a strong demand for higher quality recording, and there is also a strong demand for recording frame images on this device using two tracks set for field recording. In this case, the leading field, ie, the first field, and the trailing field, ie, the second field, of one frame on one side are each recorded on l''1.1 track, that is, divided into two tracks. In the case of the above device, as long as there is at least one track difference between field recording and frame recording, there is no difference in the recording format, so it is possible to arbitrarily change the image recording. It is logical in terms of the system to use V to be used. However, when it comes to playback, when it comes to selecting between field playback and frame playback, it is necessary to select the It is necessary to determine whether the signal recorded in one field is not recorded or if the frame is recorded (M number is recorded.On the other hand, regarding the frame recording signal, frame recording V It is also necessary to identify the pair of fields that correspond to this.
There are many. Platform recording track (C has the following three types. ■) Field recorded track 2) Frame recording ry, 1 field recorded, f
``L/this track 3) The track where the 27th f- field of frame recording is recorded. Therefore, in order to distinguish between these three cases, a minimum of 2 bits of II) (discrimination) signal is required. In other words, for example, if the field/frame ID trust and the preceding field/initiating field 11) signal in the case of frame recording are recorded, the three cases mentioned in (-) can be dealt with during playback. However, the number of ID signals that can be embedded in the video signal is 13.
, is extremely limited, so it is considered that the discrimination of these three "J combinations can be made with 1 bit. For example, if the ID signal for distinguishing between Flareby and frames in frame recording is eliminated, the ID signal will be reduced. However, the following problem occurs. Namely, when frame recording is continued as shown in Figure 1, the first field L1 and the second field cannot be distinguished, so 'Pz
1 The second field of the second frame; g 2 N
There is a possibility that the combination of the first field of the 9th frame will be erroneously reproduced as the 0 and 2 frames. It is an object of the present invention to provide a recording or reproducing apparatus for solving the problems of the prior art, and for this purpose, in the embodiment of the present invention, the first field of E frame recording is A first discrimination signal is attached to distinguish only one from the others, and a second discrimination signal is attached to the others. Therefore, when it is determined that the track that occurs during playback is the first field of frame recording, [, we note that the next track can be regarded as the second field of the frame, and in that case, frame playback is performed. In other cases, playback is performed as field A[2 recording]. The present invention will now be described in detail with reference to Examples. FIG. 2 is a diagram explaining the principle of the embodiment of the present invention, and shows frame recording;! The first discrimination signal (for example, "I J" fY:) is attached only to the A1 field. Also, the same second discrimination signal (it
For example, rOJ is added as a number 7, and they are considered to be the same thing. However, these two types of fields are both field 1.
1) Since it is sufficient as long as the ID signal is generated, one bit of ID signal is enough to deal with the three cases. Figures 3 to 5 are diagrams for explaining the method of recording such II) signals. FIG. 5 is a diagram showing an ID signal for use by a customer without showing an example of a method for representing 0. In Figure 3, 1 is the spectrum of the luminance signal, the spectrum of the two-digit color difference signal, and 3 is the spectrum of I I) (i), where the luminance signal is frequency modulated at a relatively high frequency fY, and the color difference signal is The signal is frequency modulated at a relatively low frequency f.I, , 1) The signal is, for example, 13 fH (fH is a horizontal frequency) and the luminance signal is recorded at a level of, for example, -35 (IB). Also, 'l' and '0' of the ID signal
are respectively expressed as sine waves inverted q-h as shown in FIG. Also, such I I) signal t/, J-4I
I (f- (one horizontal period)] bit is formed. As shown in Figure 5, ] field 14: 26'
Since it consists of 2.511, there are 262 and i in H.
1) Shinshu can be overlapped, but about 301-f for cutting is not good [31 +-1 to 35 in this example because bamboo etc. can easily enter]
Hk Jll and make the determination. In addition, 361-1 to 64
1 up to 14 is used as an address for recording the track number, for example. FIG. 6 is a diagram showing an example of the configuration of a recording circuit for recording an ID signal as described in FIGS. 2 to 5. In the figure, 4 is a field circuit that outputs "1" when it is the leading field and "O" when it is the succeeding field in one frame recording session, and 5 is "1" when it is in frame recording mode and outputs "0" when it is in field recording mode. This is a mode indicating circuit that outputs ゞ°0゛', and the output is switched by an external switch. 6
is an address circuit of the present invention.
``Level level output is output. 8-]1&:1:
ANI) Gate, 12~1.4 Li inverter, 1
5 is OFL gate, 16 is N A N f) gate, 1
In synchronization with the ``Horizontal Open Hano'' image issue, a Pa 1 as shown in Figure 4 was launched.
1 representing ``, outputting D signal 11) Hakuso output circuit, 18baya υ'': 4 songs in synchronization with horizontal rotation 1 υ] signal! 4 Outputs a stone signal representing 0 as shown in Figure 4.
) is a signal output circuit. 19 is a synchronous separation circuit,
For example, the synchronization signal is separated from the N i'SC input signal. 20.21 is an analog gate, 22.23tit addition delay. 24 is a decoder N 'II' SC
It is a modulator that performs several modulations, 27 recording amplifiers, 28 O
N-01", 1" switch, 29 is a changeover switch,
30, 31 (r and 31 respectively are recording heads and switch 29
The signals are selectively allocated by 32 is a head switching circuit that forms a switching signal for this switch 29. 3.3 turns on the switch 28 in response to the recording instruction signal.
01=' The recording signal for Ia is a generating circuit. Also, i,
I TJ 〆Place the head ゛30゜31゛゛゛゛゜゜゜゜゜゜゜゜゜゜゜゜
head unit 1t u y, shifting head
This is an access circuit. Like this (NANI because I have this composition) Goo 1.
16, when "0" is output from circuit 4 and "1" is output from circuit 5, "0" is output only in the trailing field of frame recording.
” is output, and at this time, the switch is made to the head position 31. Note that in other cases, the switch 29 is always on the a side and supplies a signal to the head 30. Further, it is assumed that the head 30.3J is driven by a head access circuit so that the pitch (V) is constant and the heads are always shifted at the same time, and that the fixed head 30 is in a position leading in the shifting direction. The r analog gate 20 is configured so that the circuits 4 to 7
When J is output, first 11) the switch is turned on, r ]) reaches the position where the signal is seen, and when nL M of the first field during frame recording, ≠ only opens, corresponding to "l". I do ]') Incorporate faith. Father, circuit 5 outputs "0" and AND gate 8 outputs "1.
”, 1. '+1, when recording a field, and when circuit 4 is "0", circuit 5 outputs "1", and AND gate 8 outputs "1", that is, when recording the subsequent field of frame recording, analog Circuit 2J opens and records the IIJ signal corresponding to "0". Also, analog gate 2'C) 2-Our company is -1
, the horizontal 1i1i of the opened rear rod (by the J1 signal, the umbilical cord moving circuit 118 is activated and shifts the head unit 1-1.0 by the meter track, and the next track is modulated by the head 30 wavenumbers, and the color difference signal is, for example, 1. .2 Mllz modulated by l cutting wave number, (ID - about 200 Kl - IZ (7) I
l) The signal is added and recorded via an amplifier. In addition, the synchronous separation circuit +9 & input NTSC signal to water/do. The vertical synchronization signal is separated and the timing of circuits 4 and 6 is controlled. In addition, when the recording signal generation circuit 33 is given the recording command A, -1 power (0) and performs frame recording, the switch 28 is turned ON for a period of 2 fields to guide the recording 46 lines to the head. , the recording instruction signal is given 711, and when performing fee/band recording, the switch 28 is turned off only during the l field period.
Turn on and guide the recording signal to the head. FIG. 7 is a diagram showing an example of a playback device according to the present invention.
35 is a reproducing head, 36 is a switch circuit, 37 is a head switching circuit for forming a drive signal for switching the switch circuit 36, and 39 is). 40 is a no-i pass filter for extracting the luminance signal, 41 is a band pass filter for extracting the color difference signal, and 42 is a band pass filter for extracting the HIi) signal. Teal. 43υJ−,
l 3 I) signal of ff+ and the same frequency θσ) signal in positive phase (13fH) and negative phase (,1,3fix), 18 blocks j
Oscillation Hi, 44 & Yono(nd)x Fill 4
2, the phase ratio of this signal and the output of the oscillator 43 is

[0 with a phase comparator. ID in output
The presence or absence of the signal is determined by rolr1. 1 in J”4 fins, 0.
At the output (r, l The positive phase and negative phase of the D signal phase are rlJ, respectively.
, rOJ. Note that 38 is a logic circuit that controls switching of the head switching circuit 37 in accordance with the input signal "1" or "0". 45 is a demodulator for demodulating the signal passed through the i-pass filter 40, and 46 is a demodulator for demodulating the signal passed through the filter 41. Each demodulated signal is converted into, for example, an NTSC signal in an encoder 50. 47 is a synchronization signal separation circuit that separates horizontal and vertical synchronization signals from the luminance signal. 4
81 is a horizontal synchronization circuit; 49N is an address circuit that counts horizontal and vertical synchronization signals and specifies a horizontal scanning line address at which an ID signal is to be recorded; The circuit t-1 outputs the [l-1 signal at a predetermined address position. 51 is an inverter, 52 is an AN I) gate, I-I U is a head unit, and LIA is a head access circuit. Since it is configured as shown in the figure, the output signal from the head 34 and the row 35 is amplified by the amplifier 39, and the luminance)-M signal v, which is filtered by the filter 40, is demodulated. Input field to rear encoder 50 7S1
゜Also, the filtered color difference signal is sent to the filter 41, which is decoded and inputted to the encoder i° 50 to form a multiplexed N i'' SC signal.On the other hand, the synchronous signal is separated from the luminance signal I) Address circuit 4
9, and "1" is output from the circuit 49 at a predetermined II) signal address. On the other hand, the inner water synchronization signal of the output of the 1st heat 47 for the same ↓υ is formed in the horizontal synchronization circuit, and the horizontal synchronization signal t
The signal is supplied to the address circuit 49 and also to the oscillator 43 to synchronize the oscillation phase with the horizontal synchronization circuit signal. Further, the output of the synchronous separation circuit is supplied to the logic circuit 38,
Adjust the head switching timing. Further, the phase of the signal filtered by the filter 42 is compared with the output of the second type L1 of the Shinzuki generator, and when the presence of the Il) signal is detected, the output is 0+[ rOJ signal is output)1. Also, existence I-
When there is no signal, a "1-" signal is output. Also, if there are 11 signals, if the phase is IE phase, "1" will be output to output 02, and if the phase is reversed, "0" will be output to output O3. When a positive-phase iI) signal is detected at a predetermined II) address, rlJ is output from the AND gate 52, and "()" is output in all other cases. In addition, ■I) If there is no signal, r to the d:A terminal
lJ is output. In addition, since the output υ of the AND gate 52 is fully supplied to the logic circuit, the output of the gate 52 becomes rlJ, that is, when the preceding field of frame recording is reached, all 34 heads are switched with the 0-order horizontal parallel signal F. castle/!
FIG. 88 shows a second embodiment of the present invention, in which the ID signal is superimposed as a double pulse within the vertical blanking period. In the figure, reference numeral 53 denotes an ID signal generator which generates a high level signal, which will be described later, in the case of a preceding field during frame recording. Also, when the horizontal synchronization signal reaches a predetermined address within the vertical blanking period, this high level signal is output and Y (brightness)
is added to the signal. 57 is an adder for that purpose. 54
1:'1: Frequency modulator for luminance signal, 55 is frequency l for color difference signal (1, modulator, 56 is recording amplifier, 5
8 is an adder, 59 is a recording/reproducing switching circuit, 60 is a head switching circuit, 6 ], ]&:J-, recording medium 30.31 is a recording/reproducing head, 62 is a preamplifier, 63 is a high pass
The filter 64C is a low pass filter, 65 is a demodulation circuit for the brightness signal, 66 is a demodulation circuit for the color difference signal, and 67 is an ID signal detection circuit. Also, FIGS. 9(a) and 9(b) are diagrams showing signal waveforms when II) (No. 4 is superimposed on the vertical plunging period and when it is not, respectively. The present invention will be described in detail based on the following.As mentioned above, in synchronization with the recording of the preceding field during frame recording, the ITJ signal generator generates the signal in FIG.
), the I-I) signal is output for 4 I-1 minutes, superimposed on the vertical blanking period at the front end of the Y signal, then modulated, added to the modulated color difference signal, and amplified. recorded. In other cases, that is, when the trailing field is recorded during frame recording or when field recording is performed, the Il) signal is not generated and the Y signal is not generated, as shown in FIG. 9(I)). The signal is directly modulated, added to the modulated color difference signal, and recorded on the recording medium 6I by the head 30 or 31 after being amplified by 1t. The switching circuit 59 is switched to the a side during recording and to the b side during playback. Further, head replacement using the circuit 60 may be performed as in the embodiment shown in FIG. When the circuit 59 is switched to the playback side, the playback signal obtained from the head 30 or 31 is amplified by the amplifier 62, and the low-frequency component that passes through the low-pass filter is demodulated to become a color difference signal. The high frequency component passed through the pass filter is demodulated and becomes a Y signal. Further, the pulse signal included in this Y signal is detected by the detection circuit 67, and when the IJ) pulse is at a high level, the preceding field of frame recording is detected, and the frame is reproduced by a control circuit (not shown). It is done. Also, field reproduction is performed only when the level is low. Here, frame playback means that after one field is played back, the next trunk is also played back, and field playback means that once one field is played back, no other track is played back. As explained above, according to the present invention, it is possible to distinguish between a RU-1Z Rd record and a field record with the minimum amount of information. 2) A trailing field of frame recording will not be mistaken as a leading field. 3) Since there is little ID information, there is little influence on the video signal. 4) Reproduce the second field of frame recording as field recording. Therefore, if a recording medium with a mixture of frame recording and field recording is used with a reproducing machine capable of only field reproducing or in a field reproducing state. When applied to a playback device, field recorded (g @
It is possible to reproduce the field as it is, and for a frame-recorded signal, only the succeeding field can be reproduced. This has many effects such as easily preventing errors in reproducing both the preceding and following fields of the same frame during field reproduction.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the prior art, FIG. 2 is a diagram explaining the recording or reproducing apparatus 1 of the present invention, and FIG. 3 is an example of the frequency allocation of TI) Old Gin. Figure 4 is 1. A diagram explaining an example of the first place of the D signal,
5 is a diagram for explaining the 11) signal frequency, FIG. 6 is a diagram showing an example of a recording device according to the present invention, and FIG. 7 is a diagram showing an example of a reproducing device according to the present invention. (- is a diagram showing another example of the ID signal. tr, ~tr, ... track, I I) ... rlJ
ID signal corresponding to the signal, I l)...ID signal corresponding to the "0" signal.

Claims (2)

[Claims] (1) In a recording device capable of frame i self-recording and field recording, the first discrimination signal is recorded along with the recording of the first field during frame 1 recording. A recording device configured to record a 2G20 discrimination signal along with the second field recording and field recording. (2) 1st field h<'jF when recording 7L'-m
When the first '11] Betsushin bow recorded along with the recording of the first field ac] is detected, the track where the first field shinbo was recorded and the adjacent track are reproduced, and the first field at the time of frame recording is 2-field signal recording or t, the second recorded along with the recording of the field signal during 1-field recording.
A reproducing apparatus configured to reproduce only the second field signal or a track on which the field signal is recorded when a discrimination signal is detected.