JPH075738Y2 - TV integrated video tape recorder - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a signal processing circuit of a television integrated video tape recorder (hereinafter referred to as a television integrated VTR), and particularly to a signal by a comb-shaped filter of a luminance signal and a color signal. It provides an improvement in the processing circuitry.

[Prior Art] FIG. 2 is a block diagram of a signal processing circuit of, for example, a conventional TV-integrated VTR. A video signal input terminal, (5) a tuner, (37) a switch for switching between a composite color video signal output from the tuner (5) and a composite color video signal input from the composite color video signal input terminal (2), (9) is a comb-shaped filter for separating the composite color video signal output from the switch (37) into a luminance signal and a color signal, (10) is a luminance signal recording system circuit, and (11) is a color signal recording system circuit. , (12) is a mixer for mixing a luminance signal and a chrominance signal, (13) is a recording amplifier, (14) is a video head, (15) is a magnetic tape, (1)
6) is a video head, (17) is a reproduction amplifier, (18) is a luminance signal reproduction system circuit, (20) is a high-pass filter that filters luminance signal components from a frequency-multiplexed video signal,
(21) is a dropout compensator, (22) is a limiter,
(23) is an FM demodulator, (24) is a de-emphasis, (25)
Is a low-pass filter, (19) is a color signal reproduction circuit,
(26) is a low-pass filter that filters color signal components from the frequency-multiplexed video signal, (27) is an auto chroma controller (ACC), (28) is a frequency converter, (29)
Is a burst down circuit that corrects the burst amplitude, (39)
Is a comb filter for removing crosstalk components mixed in the reproduced color signal, (30) is a bandpass filter, (4)
1) is a mixer for mixing the reproduction luminance signal and the reproduction color signal,
(38) is a switch for selecting the composite color video signal output from the switch (37) and the reproduced composite color video signal output from the mixer (41), and (40) is a composite output from the switch (38). Comb filter for separating color video signal into luminance signal and color signal, (31) Comb filter (4
(32), (33), (34) are low-pass filters, and (3)
5) is a matrix circuit, and (36) is a cathode ray tube.

[Problems to be solved by the device]

Since the conventional TV-integrated VTR is configured as described above, it is necessary to prepare a plurality of comb-shaped filters in order to separate the reproduced composite color video signals once mixed in the built-in VTR. Originally, it was thought that the circuit configuration would be simple, including the sharing of a tuner because the TV and VTR were integrated, but there was no choice but to use a plurality of comb-shaped filters despite the large volume. There is a problem that the circuit configuration of the comb filter cannot be simplified. In addition, since the comb filter has a drawback of deteriorating the diagonal resolution, although it is better not to let the luminance signal whose resolution deterioration has a great influence on the image quality pass through the comb filter, the reproduction luminance signal is also conventionally used. Since it passes through the shape filter, there is a problem that the deterioration of the diagonal resolution is caused and the image quality is greatly affected.

The present invention has been made to solve the above problems, and it is possible to separate a composite color video signal into a luminance signal and a color signal by using only one comb-type filter in the whole TV integrated VTR. At the same time, the objective is to obtain a TV-integrated VTR that eliminates noise components such as crosstalk of color signals when inputting separate luminance signals and color signals, and does not cause deterioration of the diagonal resolution of the luminance signals.

[Means for Solving the Problems]

The television integrated VTR according to the present invention has a television receiver and a video tape recorder provided in the same chassis,
A first switch configured to output an input video signal from the outside and a playback video signal of a built-in video tape recorder to a built-in television receiver, and selecting at least the input video signal and a playback signal of the built-in video tape recorder. And a composite color video signal is selected as the input video signal by the first switching means, the composite color video signal is separated into a luminance signal and a color signal, and the first video signal is input by the first switching means. As a case, when a signal in which the luminance signal and the color signal are input separately is selected, the noise component of the color signal is reduced, and when the reproduction signal of the built-in video tape recorder is selected by the first switching means, A comb filter for reducing the noise component of the color signal in the reproduced signal, a video signal other than that input to the first switching means, and the comb filter Therefore, the separated luminance signal is switched in association with the first switching means to switch between the luminance signal processing circuit of the built-in video tape recorder and the second switching means for inputting to the luminance signal processing circuit of the television receiver. Be prepared.

[Action]

The TV-integrated VTR in this invention has various types of functions such as when a composite color video signal is input from the outside, when a luminance signal and a color signal are input separately, and when a playback signal from the built-in VTR is input. By switching and outputting the video signal by the first and second switching means, the input part of the luminance signal of the built-in VTR part, the input to the color signal recording system processing circuit and the video signal input to the matrix processing circuit of the television part , A comb filter applied to separate the luminance and chrominance signals of TV broadcast signals, and a VTR.
It is possible to use a comb filter that is applied to the separation of the video signal that is input to the YC signal processing system during recording. Further, when the luminance signal and the color signal are input separately, the comb filter can reduce the noise of the color signal.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, (1) is a television broadcast signal input terminal input from a receiving antenna, (5) is a tuner, (2) is a composite color video signal input terminal, and (3) is a color signal input terminal.
(4) is a luminance signal input terminal, (7) and (8) are switches, (9) is a comb filter, (11) is a color signal recording system circuit, (10) is a luminance signal recording system circuit, and (12) is Mixer for mixing luminance and chrominance signals, (13) recording amplifier, (14)
Is a video head, (15) is a magnetic tape, (16) is a video head, (17) is a reproduction amplifier, (18) is a luminance signal reproduction system circuit, (19) is a color signal reproduction system circuit, and (20) is a frequency. A high-pass filter that filters the luminance signal component from the multiplexed video signal, (21) is a dropout compensator, and (23) is
FM demodulator, (24) de-emphasis, (25) low-pass filter, (26) low-pass filter for filtering color signal components from frequency-multiplexed video signals, (27) auto-chroma for maintaining constant gain Controller (ACC),
(28) is a frequency converter, (29) is a burst down circuit for returning the gain of only burst to the level before recording, (30) is a bandpass filter, (31) is a demodulator for demodulating a color signal into a color difference signal, (32), (33) and (34) are low pass filters, (35) is a matrix circuit, and (36) is a cathode ray tube.

The features of this device are to output the reproduced video signal to the built-in TV receiver side as it is, and to eliminate noise components such as crosstalk. A comb filter as a crosstalk canceller and a filter for separating luminance signal and color signal. It is that the comb-shaped filter is also used.

Next, the operation will be described. The switch (7) selects either the luminance signal input from the luminance signal input terminal (4), the luminance signal reproduced in the VTR or the luminance signal output from the comb filter (9), and the luminance of the VTR is selected. A switch for outputting to the signal recording system circuit (10) and the low pass filter (32) of the TV. This switch (8) is a television broadcast signal input from the receiving antenna via the tuner (5) and a composite color video signal. A switch for selecting and outputting either a composite color video signal input from an input terminal (2), a color signal input from a color signal input terminal (3), or a color signal reproduced by a VTR. Further, the switching operation of the switch (7) and the switch (8) are interlocked. Switch (7) is low pass filter (2
5) and low-pass filter (32) and luminance signal recording system (1
0) and the switch (8) connects the bandpass filter (30) and the comb filter (9). At this time, since only the color signal component is input to the comb-shaped filter (9), it works to remove noise components such as crosstalk components. Further, when the luminance signal and the color signal are separately input from the outside, the switch (7) connects the luminance signal input terminal (4) to the low pass filter (32) and the luminance signal recording system circuit, and the switch (8) is the color signal. The signal input terminal (3) and the comb filter (9) are connected. At this time, the comb filter functions to remove the noise component as described above. Also, when a composite color video signal is input by the TV radio receiver, or
When a composite color video signal is input by the television radio wave receiver, the switch (7), the comb filter (9), the luminance signal recording system (10) and the low-pass filter (32) are connected, and the switch (8) is the tuner (5) or The composite color video signal input terminal (2) and the comb filter (9) are connected. At this time, the comb filter serves to separate the composite color video signal into a luminance signal and a color signal.

In addition to reducing the number of comb filters by configuring the TV-integrated VTR as described above, deterioration of the diagonal resolution of the luminance signal when the playback signal of the built-in VTR is displayed on the built-in TV receiver. There is an effect of disappearing.

That is, since the reproduction luminance signal and the reproduction chrominance signal are mixed once as in the conventional case and the luminance signal and the chrominance signal are separated again by the comb filter of the built-in television receiver, the diagonal resolution of the comb filter is reduced. Although it was a factor that caused deterioration, with the above configuration, the reproduction luminance signal does not pass through the comb filter in the entire VTR with integrated TV, and the reproduction color signal has the crosstalk component as in the past. It will pass through a comb filter for removal. Therefore, the deterioration of diagonal resolution as in the conventional case is eliminated.

[Effect of device]

As described above, according to the present invention, the crosstalk canceller which outputs the signal to the signal processing system of the built-in television receiver without mixing the reproduced luminance signal and the reproduced color signal in the built-in VTR and uses only for the color signal. By switching the comb-shaped filter as a display and the comb-shaped filter as a filter for separating the composite color video signal into a luminance signal and a color signal, 1
Since it is realized by two comb filters, the deterioration of the diagonal resolution of the luminance signal can be reduced, the image quality is improved, and the circuit configuration is simplified, so that the cost can be reduced.

In addition, the first and second switching means are provided, and by interlocking and switching according to various input video signals to output, a luminance signal and color signal recording system processing circuit of the VTR section and a matrix processing circuit of the television section. The signal input part to can be made common, and the comb-shaped filter separates the luminance signal and the color signal,
The color signal can be shared for noise reduction, and further, the simplification of the signal path has the effect of suppressing attenuation of the video signal.

[Brief description of drawings]

FIG. 1 is a block diagram of a signal processing circuit of a television integrated VTR according to an embodiment of the present invention, and FIG. 2 is a block diagram of a signal processing circuit of a conventional television integrated VTR. In the figure, (3) is a color signal input terminal, (4) is a luminance signal input terminal, (7) and (8) are switches, and (9) is a comb filter. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A television set in which a television receiver and a video tape recorder are provided in the same chassis, and an input video signal from the outside and a playback video signal of the built-in video tape recorder are output to the built-in television receiver. In the integrated video tape recorder, first switching means for selecting at least an input video signal and a reproduction signal of a built-in video tape recorder, and a composite color video signal is selected as an input video signal by the first switching means. If the composite color video signal is separated into a luminance signal and a color signal, and a signal in which the luminance signal and the color signal are separately input is selected as the input video signal by the first switching means, the color signal is Noise component is reduced, and when the reproduction signal of the built-in video tape recorder is selected by the first switching means, the reproduction signal A comb filter for reducing the noise component of the color signal, a video signal other than the one input to the first switching means, and a luminance signal separated by the comb filter, interlocked with the first switching means. A television-integrated video tape recorder, comprising: a luminance signal processing circuit of the built-in video tape recorder and a second switching means for inputting to the luminance signal processing circuit of the television receiver.