JPS6118289A - Reproducing device - Google Patents

Abstract

PURPOSE:To obtain a dubbing signal with which a reproduced color difference line sequential signal is subject to dubbing recording as a high definition picture by providing a dubbing signal output means demodulating a color difference line sequential signal read from a recording medium and outputting it as the dubbing signal. CONSTITUTION:A switch 23 is thrown to the position P in the reproducing mode and a signal on a disc 24 is led to a preamplifier 31 via a head MH, demodulated by demodulation circuits 35, 36 and a luminance signal and a color difference signal are obtained. An output of the circuits 35, 36 is converted into an NTSC signal or an R, G, B signal at an output processing circuit 39 as an interpolating means via a Y process circuit 37 and a C process circuit 38 respectively. When a dubbing switch 40 is thrown to the position of dubbing, the interpolation processing at the circuit 39 is stopped and the luminance signal and the color difference line sequential signal not subject to interpolation are outputted as the dubbing signal from an output terminal D.OUT as a dubbing signal output means.

Description

[Detailed description of the invention] (Technical bone) The present invention relates to a playback device with excellent dubbing characteristics.

(Prior Art) A still image recording system (SV system) has been devised for recording still image signals on a porcelain disk or the like.

For example, in the frequency spectrum shown in Figure 1, the brightness signal is on the high frequency side, and the color signal on the low frequency side is transmitted in the order of color difference fs. In the form of.

Field recording of only one field or frame recording consisting of two expanded fields is performed.

Therefore, in the regenerator, the color signal must be interpolated to convert the color difference sequential signal into a color difference simultaneous signal.

Furthermore, in the case of field recording, it is necessary to convert the signal into a frame signal in order to display interlace on the monitor.

The above-mentioned conversion method is a two-pronged method in which the signals of each horizontal line are averaged and interpolated, which is very effective in improving the resolution on the monitor side.

However, when dubbing, the above-mentioned interpolation means uses the inverse Ks
It degrades greatness. Because standardized Sv
In the system format, the color difference line sequential signal (toY) of the color signal is used.

This is because the phase of R is said to be arbitrary for odd and even fields, and even in the case of nine-field recording, the signal to be recorded can be either an odd field or an even field.

This drawback will be explained using FIG. 2 (1k>, (1)).

1.4 is an O, 5H (H is horizontal period) delay circuit.

SW1 to SW4 are switch circuits, and 2, 5.6 are 1H delay circuits, and these circuits are provided in the output processing circuit of the playback device, which will be described later.

Figure 2 (a) shows the brightness If (Y) signal interpolation circuit Te8W1
, SW2 are switched for each field. −Therefore, in the first field, the input! The signal is output in a jH delayed form. Also, in the next field.

The skew is compensated by the 0.5H delay circuit 1, and the following 11
The input and output signals of the delay circuit 20 are averaged, and as a result, an interpolated signal delayed by 1.5H is output.

Figure 2(b) is a color (Q) signal interpolation circuit, and S
The WS and 0.51 delay circuit 4 are for skew compensation. 11 delay circuits 5, 6 and sw4 are for synchronizing line-sequential color difference signals. In other words, since the input line sequential signal has R-Y and B-Y every 1H,
The other color difference signal that does not exist is made into a simultaneous signal by averaging (interpolating) the OB double signal 211 signal. Therefore, the simultaneous color difference signals are B-Y: (OH+211), IH, (
oH+2H)..., the interpolation signal of one of the color difference signals is always output as a synchronized signal.

Therefore, when dubbing, there is a possibility that the luminance signal will be dubbed with the interpolated signal when reproducing field-recorded information, and the color signal will always be dubbed with the interpolated color difference signal. To repeat, the vertical resolution deteriorates in proportion to the number of dubbings.Such a problem also occurs when interpolation is performed in the horizontal direction, resulting in a deterioration of the horizontal resolution.

(Objective) An object of the present invention is to provide a reproducing device that can eliminate the drawbacks of the prior art described above.

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

(Example) The present invention will be explained below based on examples.

The fifth meat is the first meat of the BT system including the regenerating device of the present invention.
This is a configuration diagram of the embodiment. In the figure, 8 is an input processing system, 9 is a recording processing system, 10 is a first playback processing system, 11 is a second playback processing system, 12 is an output processing system, and 13 is a synchronization system. 14 is a magnetic device system, vl- is a No. 1 input terminal, and vovr is a video signal output terminal as interpolation signal output means.

The input processing system 8 is a 15mm input processing circuit that processes the waveform of the NT80 signal, RoG, B signal, etc. input from the input terminal and converts it into a color difference signal.

That is, the input processing circuit 15 outputs a luminance signal (Y+8) including a synchronization signal (S), and one color difference signal (R-Y), (B-Y).The two angle difference signals are output from the line switch LSWK. It is switched each time and output in line sequence.

After being FM-modulated by the modulation circuit 16.17 through the luminance signal (Y+8) including the synchronization signal and the color difference line sequential signal miner switch 42.45, the luminance signal (Y-)-8) is HPN'
18, and the color difference line sequential signal is mixed in a mixer circuit 20 via BPF1 9 and input to a recording amplifier 22. Note that at this time, the (RY) signal and the (B-Y) signal are FM-modulated at mutually different carrier frequencies. The signal amplified by the recording amplifier is sent to the switch 23 in recording mode.
The disk 2 as a recording medium is loaded by the head MH via the
Recorded in 4. The disk 24 is driven by a motor 25, and the motor 25 is controlled to rotate at a predetermined speed by a servo control circuit 26. In the recording mode, the switch 27 is connected to R@, so the synchronization signal generation circuit 30 is genlocked via the vertical synchronization signal separation circuit 28 based on the synchronization signal output from the input processing circuit 15 together with the luminance signal. , the servo control circuit 26 operates in accordance with the synchronization signal from the circuit 50. Note that the synchronizing signal generating circuit 30 is supplied with a signal from the oscillator 29.

Further, the synchronizing signal generating circuit 50 outputs pulses r and sp1 for regularly changing the switch LsW every 1H.

In the playback mode, the switch 23 is switched to the P side, and the signal on the disk 24 is guided to the preamplifier 51 via the mill.

The output of this amplifier 31 is HPP52. The luminance signals input to the BPFs 3 and 5 and modulated via the 1'1PF 52 are separated, and the color difference signals modulated via the BPF 55 are separated.

Thereafter, the high frequency component of the output of a'pys2 is boosted by the equalizer circuit 34, thereby compensating for the deterioration of the high frequency characteristics in the magnetic device system.

Next, the output of this equalizer circuit 34 and 1301P
The outputs of 55 are demodulated by demodulation circuits 55 and 56, respectively, to obtain a luminance signal and a color difference signal. The outputs of circuits 35 and 56 are respectively! Process circuit 57. After being subjected to various waveform processing in the O process circuit 38, the signal is converted into an NtBO signal or dR, G, B signals, etc. in an output processing circuit 39 serving as an interpolation means. Also, this output processing circuit 39 includes a luminance signal interpolation circuit and a color signal interpolation circuit as shown in FIG. For the 0 system, interpolation is performed to form a color difference simultaneous signal from a color difference line sequential signal. Also, the interpolated NT80 signal or RGB signal etc. from this output processing circuit is sent to the output terminal voTIT. output via Further, in this reproduction mode, the servo control circuit 26 is driven based on the oscillator 29 in synchronization with a synchronization signal generated by the synchronization signal generation circuit 50.

Further, since the switch 27 of the synchronizing signal generating circuit 50 is switched to the P side, the synchronizing signal generating circuit 50 is genlocked to synchronize with the vertical synchronizing signal included in the reproduced signal.

In addition, in this playback mode, the output of the BPF 35 is detected by the detection circuit 4.
1, the (RY) signal and (B-Y) signal are distinguished.

That is, since the carrier frequencies of the (R-ri signal and the (B-Y) signal are different from each other), they are distinguished by detecting the frequency components at each frequency.

This detection output is inverted every 1'F1 such that, for example, a high level py is output during the 5 period when the (RY) signal is superimposed, and a D-4 bell is output during the ■ period when the (B-Y) signal is superimposed. The pulse signal LSP 2 is used as a discrimination signal. (Fig. 5 (h)) When the dubbing switch 40 is switched to the dubbing side, the interpolation process in the output processing circuit 59 is stopped, and the luminance signal and color difference line sequential signal that are not interpolated are passed through the output processing circuit as a dubbing signal. The output terminal I)otrr as part of the dubbing signal output means is outputted. Incidentally, the dubbing signal output means is constituted by the circuits 35 to 39 and I)ovτ.

FIG. 4 is a block diagram of a main part of an example of such an output processing circuit, and in the figure, the same reference numerals as in FIGS. 2(a) and (11) indicate the same elements.

In this embodiment, the pulse V as a discrimination signal inverted every field in synchronization with the vertical synchronization signal as shown in FIG.
, Si2 and the AND gate 41.

Further, a signal from the dubbing switch circuit 40 is input to an AND gate 41.

In addition, the detection circuit 41 outputs 1H (1H) as shown in FIG.
Pulses I and SP2 that are inverted every horizontal period) are supplied to the switch circuit BW4, and this pulse LOP
2 is output together with the dubbing signal from the discrimination signal output terminal L8P20t7T in the output terminal DOUT.

Therefore, dubbing switch time P4! When r40 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 circuit date W1.8W2, EIW5 #
'i Switches for each field.

For example, in the first field, switch circuits sW1 to SW
S is connected to the A side by 1iI+, and the luminance signal is delayed by 1H and output. Further, in this field, the color difference signal is obtained alternately as an original signal and an interpolated signal every 1H.

Moreover, in the second field, switch circuits SW1 to SWX
is connected to the B side, the luminance signal is delayed by 0.5H and skew compensated, and vertical interpolation is performed using the original signal and the signal delayed by 1H.

Also, skew compensation is criticized for color difference signals.

Furthermore, 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 7 Therefore, the switch SW2 is opened, so that the same fifted signal is sent to the dubbing signal output terminal DOU for both the first and second fields.
T) will be output.

Further, since the color difference line sequential signal always leads the output of the 1R delay circuit 5 before being interpolated to the terminal DOTFT, the delayed original signal is output.

In addition, in this embodiment, the pulse LOP 2 is output from the output terminal DO1T.
Since it is output in T direction, the color difference line sequential signal (
R-Y) and (B-Y) can be easily distinguished on the dubbing device side.

Further, this dubbing signal can be inputted from the dubbing signal input terminal DIM on the recording device side through switches 42 to 44.
is switched to the D side during dubbing recording.1 circuit 16, 17
For each external signal for dubbing! A color difference line sequential signal CD for D dubbing is input.

Further, the pulse LAP 2 switches the carrier frequency in the modulation circuit 17 according to (R-r) and (B Y).

In this embodiment, a special dubbing signal output terminal ootn
' is provided, but the video signal output terminal VOUT may also be used.

In the present embodiment, the recording device is constituted by the input terminal vIN input system input system recording processing system 9, the dubbing signal input terminal Dxl, the amplifier 22, the magnetic device system 14, the synchronization system 15, etc.
Magnetic device system 14, synchronization system 13, amplifier 51. a first reproduction processing system 10, a second reproduction processing system 11, an output processing system 12,
Video signal output terminal votr'r dubbing signal output terminal DO
The regeneration cap is made up of TJT and the like.

Also, magnetic device system 14. The synchronizing system 13 is shared by the recording device and the reproducing device), and all the circuits shown in FIG. 6 are housed in the same housing. Of course, there is no difference between the recording device and the reproducing device as they are separate entities.

As described above, according to this embodiment, there is a dubbing signal output means for demodulating the reproduced color difference line f@ order signal and outputting it as a dubbing signal, and a discrimination signal output means for forming and outputting a discrimination signal corresponding to each color difference signal. Therefore, when dubbing the demodulated nine-color-difference line-order input signal, each color-difference signal in the line-order can be distinguished and recorded, and when the color-difference signals are replaced by dubbing, the color-difference signal after interpolation can be dubbed and recorded. I want to do something.

Figure 6 is a diagram showing a second embodiment of the present invention, and this embodiment is an example of a playback device that can perform high-quality dubbing even when using signals after interpolation for luminance signals, etc. be.

In other words, since the discrimination signal ID for discriminating between a vertically interpolated field and a field that outputs the original signal as is is output together with the dubbing video signal, vertical interpolation is not performed in the video signal output from the playback device. It is now possible to dub and record only the signal.

In FIG. II6, the same reference numerals as in FIGS. 1 to 5 indicate the same elements.

This is a tortoise formed by ANDing the discrimination signal τD #iK in FIG. 5(0), the signal V in FIG. 5(&), and the signal I and 8P2 in FIG. 5(1)). This tD is DOU
The signal is outputted from the terminal FOUT which serves as a discrimination signal output means within τ.

Further, during dubbing, this discrimination signal XD is input to the modulation circuit 16 via the switch 44, so that modulation is performed only while the distortion envelope is at a high level.

Therefore, the vertically interpolated signal is not recorded.

In addition, the ID signal is KV and LSP 2 to reduce the number of terminals.
However, if the number of terminals can be increased, each signal may be output from separate terminals (effect). As explained above, according to the present invention, the reproduced color difference line sequential signal can be correctly raised It is possible to obtain a playback device that outputs a dubbing signal for dubbing and recording as a quality image.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the recording state of signals on a recording medium, and Fig. 2 (%) l (1)) respectively! Signal correction circuit diagram, O signal correction circuit diagram, Fig. 3 is a diagram of the first embodiment of the present invention, Fig. 4 is an example of the main part configuration of the output processing circuit, Fig. 5 is a waveform diagram of various discrimination signals, FIG. 6 is a diagram showing a second embodiment of the present invention. 24...Disc DOU as a recording medium...Dubbing signal output terminal 55.56...Demodulation circuit 37.58...Process circuit 39...Output processing circuit as interpolation means 55-59
I, SF3 evt"D',, discrimination signal 118P2O, which constitutes a dubbing signal output means (DOUT, etc.)
UT, IDoυ! ...Output terminal R-Y 8-Y as discrimination signal output means

Claims (1)

[Scope of Claims] Tabbing signal output means for demodulating a modulated color difference line sequential signal read from a recording medium and outputting it as a dubbing signal; and discrimination signal output means for forming and outputting a discrimination signal corresponding to each color difference signal. A playback device having: