JPH0965365A - Video signal reproducing device and video signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously confirm all of component signals even with a single system in the video signal reproducing device and the video signal recording and reproducing device which reproduce the signals obtained by recording component video signals in the TCI (color line-sequential time-compressed integration) system. SOLUTION: The signal recorded on a magnetic tape 12 is taken out by a reproducing head 13 and is amplified by a reproduced amplifier 14 and is demodulated by an FM demodulator 15 and is converted into a digital signal by an A/D converter 16. The time base, line positions, and the number of lines are controlled without separation of Y signal data and PB and PR signal data based on the timing signal from a timing generation circuit 18 by a signal processing circuit 17, and the signal is converted into an analog signal by a D/A converter 19 and is added to the synchronizing signal generated by a synchronizing signal generation circuit 20 by a synchronizing signal addition circuit 21, and the addition result is outputted from a signal output terminal 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal reproducing apparatus and a video signal recording / reproducing apparatus, and is particularly suitable for reproducing a signal in which a component video signal is recorded using a color line sequential time division multiplexing system. Is.

[0002]

2. Description of the Related Art In recent years, when transmitting a wideband component signal such as a high-definition signal or recording on a VTR or the like, various signal band compression methods are used to improve recording efficiency. Speaking of NTSC, it is a composite signal, but since there is no composite signal in the high-definition system, MUSE developed mainly for NHK.
The scheme is used. However, this method answers the needs for consumer use and is not necessarily suitable for the needs for business. As an alternative signal compression method, a luminance signal (hereinafter referred to as Y signal) and a color signal (hereinafter P _B , P It is well known that the color line sequential time division multiplex method using the visual difference from the _R signal) is used.

A conventional video signal recording / reproducing apparatus will be described below with reference to the drawings. FIG. 3 is a block diagram of a conventional video signal recording / reproducing apparatus. In FIG.
23 is a Y signal input terminal, 24 is a P _B signal input terminal, 25
Is a P _R signal input terminal, 26 is a Y signal A / D converter, 2
7 is an A / D converter for P _B signals, 28 is an A / D converter for P _R signals, and 29 is a color line sequential time division multiplexing (hereinafter referred to as TCI).
Encoder, 30 is D / A converter, 31 is FM modulator,
32 is a recording amplifier, 33 is a recording head, 34 is a magnetic tape, 35 is a reproducing head, 36 is a reproducing amplifier, and 37 is an FM.
Demodulator, 38 A / D converter, 39 Y signal timing generation circuit, 40 Y signal TCI decoder, 41 P
_B , P _R signal timing generation circuit, 42 P _B , P _R signal TCI decoder, 43 Y signal D / A converter, 44
Is a P _B signal D / A converter, 45 is a P _R signal D / A converter, 46 is a Y signal output terminal, 47 is a P _B signal output terminal,
Reference numeral 48 is a P _R signal output terminal.

FIG. 4 is a signal diagram for explaining the operation of the TCI encoder 29. FIG. 4A is a TCI encoder 2
9 is Y signal data, (b) is P _B signal data input to the TCI encoder 29, (c) is P _R signal data input to the TCI encoder 29, and (d) is T
This is encoded data output from the CI encoder 29.

Video signal recording / reproducing configured as described above
The operation of the device will be described below. Y signal
The Y signal input to the input terminal 23 is the A / D converter for the Y signal.
It is converted into a digital signal by the converter 26 and P_BSignal input terminal
P entered in 24_BThe signal is P_BSignal A / D converter 2
Converted to digital signal at 7, P_RTo the signal input terminal 25
Input P_RSignal is P_RThe A / D converter for signal 28
It is converted to a Tal signal. Each digital signal is TCI
In the encoder 29, as shown in (b) and (c) of FIG.
P _B, P_REach signal is thinned out line by line, (d) in the figure.
As shown in, after changing the time axis,
Digital TC that forms one line in combination with the digital signal
Encoded into I signal and analog in D / A converter 30
After being converted to a signal, the FM modulator 31 converts the TCI signal to F
After M modulation and current amplification in the recording amplifier 32,
It is recorded on the magnetic tape 34 via the code 33. Magnetic tape
The signal recorded in the loop 34 is taken out by the reproducing head 35.
After being amplified by the reproduction amplifier 36, the FM demodulator 37
Demodulated and converted to a digital signal by the A / D converter 38
You. The Y signal data is transmitted to the Y signal by the Y signal TCI decoder 40.
Based on the timing signal from the signal timing generation circuit 39
Then, the time axis is decoded and the Y signal D / A converter 4
Converted to analog signal at 3 and output from Y signal output terminal 46
Is forced. P of TCI digital signal_B, P_RSignal data
Is P_B, P_RP by signal TCI decoder 42_B, P_Rsignal
Based on the timing signal from the timing generation circuit 41 for
The time axis etc. is decoded and the
After interpolating the signal, P_BSignal data is P_BD / for signal
Converted to an analog signal by the A converter 44, P_BSignal output end
Output from child 47, P_RSignal data is P_RD / A for signal
Converted to an analog signal by converter 45 P _RSignal output terminal
It is output from 48.

Further, in the conventional video signal reproducing apparatus (apparatus other than the elements 23 to 33 in FIG. 3),
A reproduction operation similar to the above-described operation is performed.

[0007]

However, in the above conventional video signal reproducing apparatus and video signal recording / reproducing apparatus,
Since the TCI decoder circuit is complicated and large in size, it is difficult to reduce the cost and space, and the output signal remains as a component. Therefore, all signals can be checked at the same time on a monochrome monitor (such as a camera viewfinder). There was a problem to say. Also, when confirming all the HDTV component signals using an NTSC monitor, if the number of scanning lines is converted for each of the Y, P _B , and P _R signals, and they are not encoded into a composite signal, all the signals will be recorded in a single system. At the same time, there was a problem that it could not be confirmed.

The present invention solves the above problems and is a compact, inexpensive and single system in a video signal reproducing apparatus and a video signal recording / reproducing apparatus for reproducing a signal in which a component video signal is recorded by using the TCI system. However, it is an object of the present invention to provide a video signal reproducing apparatus and a video signal recording / reproducing apparatus which can simultaneously confirm all component signals and can easily confirm all high-definition component signals on an NTSC monitor.

[0009]

In order to achieve the above object, the present invention has a horizontal frequency conversion means for converting a TCI signal into an arbitrary frequency during reproduction and a number of scanning lines of the TCI signal into an arbitrary number. The scanning line number converting means and the synchronizing signal adding means for adding an arbitrary synchronizing signal are provided.

[0010]

The present invention has the above-mentioned structure and has a TCI during reproduction.
By performing the signal processing without changing the signal configuration, a complicated TCI decoding circuit is not used, so that it is possible to confirm all the component signals at the same time in a small size, at a low cost, and in a single system. Therefore, it is not necessary to encode the composite signal to check the color signal, and all the HDTV component signals can be easily checked on the NTSC monitor.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a video signal recording / reproducing apparatus according to an embodiment of the present invention. In Figure 1, 1 is Y signal input terminal, 2 is P _B signal input terminal, 3 P _R signal input terminal, 4 is Y signal A / D converter, 5 P _B
A / D converter for signal, 6 is A / D converter for P _R signal, 7
Is a color line sequential time division multiplexing (hereinafter referred to as TCI) encoder, 8 is a D / A converter, 9 is an FM modulator, 10 is a recording amplifier, 11 is a recording head, 12 is a magnetic tape, 13 is a reproducing head, 14 Is a reproduction amplifier, 15 is an FM demodulator, and 16
Is an A / D converter, 17 is a signal processing circuit, 18 is a timing generation circuit, 19 is a D / A converter, 20 is a synchronization signal generation circuit, 21 is a synchronization signal addition circuit, and 22 is a signal output terminal.

The operation of the video signal recording / reproducing apparatus of this embodiment constructed as described above will be described below. Y signal inputted to the Y signal input terminal 1 is the Y signal A / D converter 4 is converted into a digital signal, P _B signal input terminal 2 P _B signal input to the P _B signal A / D converter 5 and converted into a digital signal, P _R signal input P _R signal input to the terminal 3 is converted to a digital signal by P _R signal a / D converter 6, each of the digital signal TCI encoder 7 Then, the P _B and P _R signals are thinned out for each line,
After the time axis is changed, it is encoded into a digital TCI signal which is combined with the time axis changed Y signal to form one line, is converted into an analog signal by the D / A converter 8, and is then converted by the FM modulator 9 into the TCI signal. After FM modulation and current amplification by the recording amplifier 10, recording is performed on the magnetic tape 12 via the recording head 11. The signal recorded on the magnetic tape 12 is taken out by the reproducing head 13, amplified by the reproducing amplifier 14, demodulated by the FM demodulating circuit 15, converted into a digital signal by the A / D converter 16, and is then processed by the signal processing circuit 17. Based on the timing signal from the timing generation circuit 18, the time axis is controlled in a state where Y signal data and P _B and P _R signal data are not separated,
When converting to a C signal, the number of scanning lines is also controlled and converted to an analog signal by the D / A converter 19, and the synchronization signal adding circuit 1
If the sync signal generator circuit 20 converts the high-definition sync signal to the high-definition sync signal in NT, NT
The SC sync signal is generated, added, and output from the signal output terminal 22.

Next, the detailed structure of the actually reproduced signal on the monitor will be described with reference to FIG. FIG. 2A shows a display on the entire monitor.
P _B is on the left side of the screen (front on the signal),
The P _R signal is alternately displayed in the horizontally compressed state, the Y signal in the horizontally compressed state is displayed on the right side thereof, and the component signal is simultaneously displayed on the monochrome screen.

FIG. 2B is an enlarged view of a part of the first field of FIG. The P _B and P _R signal lines are alternately displayed and the Y signal lines are sequentially displayed by the color line sequential time division multiplexing process. Next, details of the operations of the signal processing circuit 17 to the synchronous addition circuit 22 will be described with reference to FIG.

5D to 5E are high-definition T
It shows a time axis process for converting a CI signal into a high-definition signal. A time axis compression process is performed to insert the ternary synchronization signal. 5D to 5F show the time axis and scanning line processing for converting the HDTV TCI signal into the NTSC signal. Scan line 1125
In order to reduce the number of lines from the number of lines to 525, the scanning line is thinned out, and the time axis expansion process is performed in order to match the time axes of one line.

As described above, according to the video signal reproducing apparatus of this embodiment, when the TCI signal is recorded and reproduced, the component axis is controlled by controlling the time axis and the number of lines without changing the structure of the TCI signal. Simultaneous display using a single system, NT for all high definition component signals
The effect is that it can be displayed on the SC monitor. Although FM signal recording / reproducing is described in the above embodiments, it can be used for digital signal recording / reproducing.

Although the video signal recording / reproducing apparatus has been described in the above embodiments, the same effect can be obtained in the video signal reproducing apparatus (apparatus other than the components 1 to 11 in FIG. 1). It is self-explanatory.

[0018]

As is apparent from the above description, according to the video signal reproducing apparatus and the video signal recording / reproducing apparatus of the present invention, when the video signal is converted into the TCI signal and the recorded recording medium is reproduced, the TCI signal is reproduced. To an arbitrary vertical frequency signal and an arbitrary horizontal frequency signal, and a means for converting the scanning line of the TCI signal into an arbitrary position and an arbitrary number.
By having a sync signal adding means for adding arbitrary sync signals, it is possible to check all component signals at the same time with a single system, which is small, inexpensive, and can easily check all HDTV component signals on an NTSC monitor. Becomes

[Brief description of drawings]

FIG. 1 is a block diagram of a video signal recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a display state of the output signal of FIG. 1 on a monitor.

FIG. 3 is a block diagram of a conventional video signal recording / reproducing apparatus.

FIG. 4 is a signal diagram showing the operation of the TCI encoder.

FIG. 5 is an operation explanatory diagram of digital signal processing of the reproduction system of the video signal recording / reproducing apparatus in the embodiment of the present invention.

[Explanation of symbols]

1 Y signal input terminal 2 P _B signal input terminal 3 P _R signal input terminal 4 for Y signal A / D converter 5 P _B signal A / D converter 6 P _R signal A / D converter 7 color line sequential Time division multiplex encoder 8 D / A converter 9 FM modulator 10 Recording amplifier 11 Recording head 12 Magnetic tape 13 Reproducing head 14 Reproducing amplifier 15 FM demodulator 16 A / D converter 17 Signal processing circuit 18 Timing generation circuit 19 D / A converter 20 synchronization signal generation circuit 21 synchronization signal addition circuit 22 signal output terminal

Claims (2)

[Claims] 1. A video signal reproducing apparatus for converting a video signal into a color line sequential time division multiplex signal and reproducing the recorded recording medium, wherein the horizontal frequency of the color line sequential time division multiplex signal is set to an arbitrary frequency during reproduction. Horizontal frequency conversion means for converting to
A video signal reproducing apparatus having a scanning line number converting means for converting the number of scanning lines of the color line sequential time division multiplexed signal into an arbitrary number and a synchronizing signal adding means for adding an arbitrary synchronizing signal. 2. A video signal recording / reproducing apparatus for converting a video signal into a color-line-sequential time-division multiplexed signal, recording and reproducing the same, and converting the horizontal frequency of the color-line-sequential time-division multiplexed signal into an arbitrary frequency during reproduction. Video signal recording / reproducing having horizontal frequency converting means, scanning line number converting means for converting the number of scanning lines of the color line sequential time division multiplexed signal into an arbitrary number, and synchronizing signal adding means for adding an arbitrary synchronizing signal apparatus.