JPH0685587B2 - Playback device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reproducing apparatus having excellent dubbing characteristics.

(Prior Art) A still image recording system (SV system) for recording a still image video signal on a porcelain disc or the like has been conventionally devised.

A magnetic disk, which is an information recording medium of such an SV system, has a frequency spectrum as shown in FIG.
Luminance signals are recorded on the high frequency side and color signals are recorded on the low frequency side in a color-difference line-sequential manner. Field recording of only one field or frame recording consisting of two fields is performed.

Therefore, in the regenerator, the color signals need to be interpolated so as to convert the color difference sequential signals into the color difference simultaneous signals.

Further, in the case of field recording, it is necessary to convert it into a frame signal for interlaced display on the monitor.

As the above-mentioned conversion method, a method of averaging the signals of each horizontal line and interpolating is common, and the resolution is improved on the monitor side, which is very effective.

However, when dubbing, the above-mentioned interpolating means conversely deteriorates the resolution. In the standardized SV system format, it is said that the phase of the color difference line sequential signals (BY, RY) of the color signal is arbitrary between odd and even fields, and when field recording is performed. This is because it is considered that the signal to be recorded may be either an odd field or an even field.

This drawback will be described with reference to FIGS. 2 (a) and 2 (b). 1,
Reference numeral 4 is an O, SH (H is a horizontal period) delay circuit, SW1 to SW4 are switch circuits, and 2,5,6 are 1H delay circuits. These circuits are provided in the output processing circuit of the reproducing apparatus described later. There is.

FIG. 2A shows a luminance (Y) signal interpolating circuit, where SW1 and SW2 are 1
It can be switched for each field. Therefore, in the first field, the input Y signal is output with a delay of 1H. or,
At the next field, skew compensation is performed by the 0.5H delay circuit 1, the input / output signals of the next 1H delay circuit 2 are averaged, and as a result, an interpolation signal delayed by 1.5H is output.

FIG. 2B shows a color (c) signal interpolating circuit, and SW3
The 0.5H delay circuit 4 is for skew compensation. The 1H delay circuits 5 and 6 and SW4 are for synchronizing the line sequential color difference signals. That is, since the input line-sequential signal has RY and BY for every 1H, the other color difference signal that does not exist is made a simultaneous signal by averaging (interpolating) the OH signal and the 2H signal. Therefore, the simultaneous color difference signal is As described above, either one of the color difference signals always outputs the interpolation signal as the synchronization signal. Therefore, during dubbing, the luminance signal may dubb an interpolation signal when reproducing the field-recorded information, and the color signal always dubbs the interpolated color difference signal.

Therefore, if the dubbing is repeated, the vertical resolution becomes worse in proportion to the number of dubbing times. Such a problem also occurs when interpolation is performed in the horizontal direction, which also deteriorates the horizontal resolution.

(Object) The object of the present invention is to provide a reproducing apparatus capable of solving the above-mentioned drawbacks of the prior art.

Another object of the present invention is to provide a reproducing apparatus with less deterioration of resolution.

(Example) Hereinafter, the present invention will be described based on examples.

FIG. 3 is a block diagram of a first embodiment of an SV system including a reproducing apparatus of the present invention, in which 8 is an input processing system, 9 is a recording processing system, 10 is a first reproduction processing system, and 11 is a first processing system. 2, playback processing system, 12
Is an output processing system, 13 is a synchronous system, 14 is a magnetic device system, V _IN is a video signal input terminal, and V _OUT is a video signal output terminal as an interpolation signal output means.

In the input processing system 8, reference numeral 15 is an input processing circuit for waveform-processing the NTSC signal or RGB signal or the like input from the input terminal and converting it into a color difference signal.

That is, the luminance signal (Y + S) including the synchronization signal (S) and the color difference signals (RY) and (BY) output from the input processing circuit 15 are output by the line switch LSW for each horizontal period. It is switched and output line-sequentially.

The luminance signal (Y + S) including the synchronization signal and the color difference line sequential signal are FM-modulated by the modulation circuits 16 and 17 via the switches 42 and 43, respectively, and then the luminance signal (Y + S) is transmitted via the HPF 18 and the color difference. The line-sequential signals are mixed by the mixer circuit 20 via the BPF 19 and input to the recording amplifier 22. At this time, the (RY) signal and the (BY) signal are FM at different carrier frequencies.
Is modulated. In the recording mode, the signal amplified by the recording amplifier is recorded on the disk 24 as a recording medium by the head MH via the switch 23. The disk 24 is driven by a motor 25, and the motor 25 is rotationally controlled at a predetermined speed by a servo control circuit 26. In the recording mode, since the switch 27 is connected to the R side, the synchronizing signal generating circuit 30 is locked through the vertical synchronizing signal separation circuit 28 based on the periodic signal output from the input processing circuit 15 together with the luminance signal. Servo control circuit 26 by synchronizing signal from
Works. A signal from the oscillator 29 is supplied to the synchronization signal generation circuit 30.

Further, the synchronizing signal generating circuit 30 outputs a pulse LSP1 for constantly changing the switch LSW every 1H.

In playback mode, switch 23 is switched to P side,
The signal on 24 is conducted to the preamplifier 31 via the head MH.

The output of this amplifier 31 is input to HPF32 and BPF33 respectively, and HPF
The luminance signal modulated via 32 is separated, and the color difference signal modulated via BPF 33 is separated.

After that, the equalizer circuit 34 raises the high frequency component of the output of the HPF 32, and the deterioration of the high frequency characteristic in the magnetic device system is compensated.

Next, the output of the equalizer circuit 34 and the output of the BOF 33 are demodulated in the demodulation circuits 35 and 36, respectively, and a luminance signal and a color difference signal are obtained. The outputs of the circuits 35 and 36 are subjected to various kinds of waveform processing in the Y process circuit 37 and the C process circuit 38, respectively, and then converted into NtSC signals or R, G, B signals and the like in an output processing circuit 39 as an interpolating means. Also, this output processing circuit 39
A luminance signal interpolating circuit and a color signal interpolating circuit as shown in FIG. 4 which will be described later are included therein, and when dubbing is not performed, interpolation for forming a frame signal from a field signal is performed for the Y system, and C With respect to the system, interpolation for forming a color difference simultaneous signal is performed from the color difference line sequential signal.
Also, the interpolated NTSC signal or RG from this output processing circuit
The B signal and the like are output via the output terminal V _OUT . In this reproduction mode, the servo control circuit 26 is driven by the oscillator 29 in synchronization with the sync signal generated by the sync signal generation circuit 30.

Further, since the switch 27 of the synchronizing signal generating circuit 30 is switched to the P side, a genlock is provided so as to synchronize with the vertical synchronizing signal contained in the reproduced signal.

In this reproduction mode, the output of the BPF 33 is guided to the detection circuit 41 to discriminate between the (RY) signal and the (BY) signal.

That is, since the carrier frequencies of the (RY) signal and the (BY) signal are different from each other, the two are distinguished by detecting the frequency component at each frequency.

This detection output is inverted every 1H such that, for example, a high level is output in the H period in which the (RY) signal is superimposed and a DV bell is output in the H period in which the (BY) signal is superimposed. It becomes the pulse signal LSP2 as a signal. (FIG. 5 (h)) Further, when the dubbing switch 40 is switched to the dubbing side, the interpolation processing in the output processing circuit 39 is stopped, and the luminance signal and the color difference line sequential signal which are not interpolated are converted into a dubbing signal via the output processing circuit. It is output from the output terminal D _OUT as a part of the dubbing signal output means. Circuits 35-39 and D
_The dubbing signal output means is composed of _{OUT and the} like.

FIG. 4 is a block diagram of an essential part of an example of such an output processing circuit, in which the same reference numerals as those in FIGS. 2A and 2B indicate the same elements.

In this embodiment, a pulse V as a discrimination signal inverted every 1 field is supplied to the switches SW1 and SW3 and the AND gate 41 in synchronization with the vertical synchronizing signal as shown in FIG. ing.

Also, the signal from the dubbing switch circuit 40 is AND gate 41.
Are typing in.

Further, the from the detection circuit 41 is a pulse LSP2 that is inverted every 1H, as of FIG. 5 (b) (horizontal period) are supplied to the switching circuit SW4, the pulse LSP2 is output in D _OUT with dubbing signal It is output from the discrimination signal output terminal LSP2 OUT of. Therefore, when the dubbing switch circuit 40 is not on the dubbing side, a high level signal is output from the circuit 40 and the gate 41 is open.

In this case, the switch circuits SW1, SW2, SW3 are switched for each field.

For example, in the first field, the switch circuits SW1 to SW3 are A
, And the luminance signal is delayed by 1H and output.
Further, in this field, the color difference signal is obtained alternately with the original signal and the interpolation signal every 1H.

In the second field, the switch circuits SW1 to SW3 are connected to the B side, and the luminance signal is delayed by 0.5H for skew compensation, and vertical interpolation is performed by the original signal and the signal delayed by 1H.

In addition, skew compensation is also performed on the color difference signals.

When the dubbing switch circuit 40 is connected to the dubbing side, a low level signal is output and the AND gate 41 is closed.

Therefore, since the switch SW2 is opened, the same field signal is output from the dubbing signal output terminal D _{OUT in} both the first and second fields.

Further, since the color difference line sequential signal always leads the output of the 1H delay circuit 5 before the interpolation processing to the terminal D _OUT , the delayed original signal is output.

Further, in this embodiment, since the pulse LSP2 is output from the output terminal D _{OUT, the} color difference line sequential signal (RY),
The (BY) discrimination can be easily performed on the dubbing device side.

Further, this dubbing signal can be inputted from the dubbing signal input terminal D _IN on the recording apparatus side.

Switches 42 to 44 are switched to the D side during dubbing recording.
A luminance signal YD for dubbing and a color difference line sequential signal CD for dubbing are input to the circuits 16 and 17, respectively.

Further, the pulse LSP2 switches the carrier frequency in the modulation circuit 17 according to (RY) or (BY).

Although the special dubbing signal output terminal D _OUT is provided in the present embodiment, the video signal output terminal V _OUT may also be used.

In this embodiment, the input terminal V _IN input processing system 8, the recording processing system 9, the dubbing signal input terminal D _IN , the amplifier 22, the magnetic system 1
4, the recording system is composed of the synchronization system 13, etc., and the magnetic system 1
4, a synchronization system 13, an amplifier 31, a first reproduction processing system 10, a second reproduction processing system 11, an output processing system 12, a video signal output terminal V _OUT dubbing signal output terminal D _OUT, etc., constitutes a reproducing apparatus. There is.

The magnetic device system 14 and the synchronizing system 13 are shared by the recording device and the reproducing device, and the circuits shown in FIG. 3 are all housed in the same housing. Of course, the recording device and the reproducing device may be separate bodies.

As described above, according to the present embodiment, a dubbing signal output unit that demodulates the reproduced color difference line sequential signal and outputs it as a dubbing signal, and a discrimination signal output unit that forms and outputs a discrimination signal corresponding to each color difference signal are provided. Therefore, when dubbing demodulated chrominance line-sequential signals, each line-sequential chrominance signal can be distinguished and dubbed for recording. There is nothing to do.

Next, FIG. 6 is a diagram showing a second embodiment of the present invention. This embodiment is an example of a reproducing apparatus capable of high-quality dubbing even using a signal after interpolation of a luminance signal or the like. is there.

That is, since the discrimination signal _ID for discriminating between the field for vertical interpolation and the field for directly outputting the original signal is output together with the dubbing video signal, the vertical interpolation of the video signal output from the reproducing apparatus is performed. It is possible to record only the signals that are not recorded.

In FIG. 6, the same reference numerals as in FIGS. 1 to 5 indicate the same elements.

The discrimination signal _{ID in} FIG. 5 (c) is formed by ANDing the signal V in FIG. 5 (a) and the signal LSP2 in FIG. 5 (b). This I _D is output from the terminal I _DOUT as a discrimination signal output means in D _OUT .

Further, this discrimination signal I _D is input to the modulation circuit 16 via the switch 44 at the time of dubbing so that the modulation is performed only while the envelope of I _D is at the high level.

Therefore, the vertically interpolated signal is not recorded.

The I _D signal is ANDed with V and LSP2 to reduce the number of terminals.
Although signals are used, if the number of terminals can be increased, each may be output from a different terminal.

(Effect) As described above, according to the present invention, a color image signal composed of a line-sequential color information signal and a luminance information signal in which color information signals indicating different types are sequentially displayed in each horizontal synchronization period is recorded. It is possible to obtain a reproducing device which reproduces the color image signal from a recording medium that has been recorded and outputs a dubbing signal for dubbing recording as a correct and high-quality color image signal.

[Brief description of drawings]

FIG. 1 is a diagram showing a signal recording state on a recording medium, FIGS. 2 (a) and 2 (b) are Y signal correction circuit diagrams, c signal correction circuit diagrams, and FIG. 3 is a first embodiment of the present invention. An example diagram, FIG. 4 is a diagram showing a configuration example of a main part of an output processing circuit, FIG. 5 is a waveform diagram of various discrimination signals, and FIG. 6 is a second example of the present invention. 24 …… Disk as recording medium D _OUT …… Dubbing signal output terminal 35,36 …… Multitone circuit 37,38 …… Process circuit 39 …… Output processing circuit as interpolation means 35 to 39 and D _OUT
DSP signal output means is composed of etc. LSP2, V, I _D …… Discrimination signal LSP2OUT, I _DOUT …… Output terminal as discrimination signal output means

Continuation of front page (56) Reference JP-A-58-33387 (JP, A) JP-A-56-153896 (JP, A) JP-A-58-88988 (JP, A) JP-A-58-39186 (JP , A)

Claims (1)

[Claims] 1. A color medium is recorded from a recording medium on which a color image signal composed of a line-sequential color information signal and a luminance information signal, in which color information signals indicating different types are sequentially displayed in each horizontal synchronization period, are recorded. A device for reproducing an image signal, which reproduces a color image signal recorded on the recording medium and outputs a luminance information signal and a line-sequential color information signal, and a luminance outputted from the reproducing unit. The information signal and the line-sequential color information signal are output to an external device, and the line-sequential color information signal output from the reproducing means outputs a determination signal corresponding to the type of the color information signal shown in each horizontal synchronization period. A reproducing device having a dubbing output terminal for outputting to the device.