JPH02205193A - Recording and reproducing method for television signal - Google Patents

Abstract

PURPOSE:To record and reproduce the television signal of a wide aspect ratio still with the recording system of conventional technique by executing signal processing to separate and restore significant information, which are superimposed by three-dimensional signal processing, before recording. CONSTITUTION:A television signal VS executes processing to separate and restore the superimposed significant information and to separate luminance chrominance signal components in a wide aspect ratio decoder circuit 1 and generates a luminance signal YW and a chrominance signal CW of the wide aspect ratio in a base band region. On the other hand, in a present system YC separation circuit 2, a luminance signal YS and a chrominance signal CS in the base band region are generated. In a select circuit 4, the signal of any one system is selected according to an identification signal CTS and outputted as Y and C. In a process circuit 5, the prescribed signal processing needed for the recording with a color under system is executed to the Y and C signals and a recorded signal VR, to which the identification signal CTS is also added, is generated together and recorded on a tape.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to recording and reproducing television signals, and in particular to recording and reproducing television signals suitable for wide aspect ratio television signals that are compatible with current systems. Regarding playback methods.

[Conventional technology]

Recently, in the field of television, consideration has been given to changing the aspect ratio of the current television system to a wide aspect ratio, which is longer than the aspect ratio of the current television system, in order to provide a more realistic image service. However, even in these wide aspect ratio televisions, it is desired that the transmission system etc. be compatible with the current television system. For this reason,
Various types of wide aspect ratio television signals have been proposed that are compatible with current systems.

In wide aspect ratio television signals that are compatible with these aspects, significant information necessary to realize the wide aspect ratio is often superimposed on the gaps in the signal spectrum of the current television system. Separation of these significant information requires three-dimensional signal processing.

Wide aspect ratio television signals that are compatible with these can be recorded on VTRs, VCRs, etc.

When playing back, significant information is further superimposed on the signal of the current television system, making it susceptible to jitter and the like. In particular, it is expected that the influence will be particularly large in the color under recording method used in home VCRs and the like.

[Problem to be solved by the invention]

If you try to record and playback a wide aspect ratio television signal that is compatible with the current television system mentioned above using the conventional recording system, significant information will be lost in the playback signal due to the effects of 3D signal processing due to the effects of jitter, etc. A problem arises in that signal processing such as separation and restoration becomes difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording and reproducing method that can record and reproduce wide aspect ratio television signals that are compatible with current television systems even with conventional recording systems.

Another object of the present invention is to provide a recording and reproducing method that allows a reproduced wide aspect ratio television signal to be reproduced as a normal wide aspect ratio image even on a television receiver having a current aspect ratio.

Another object of the present invention is to provide a recording and reproducing method capable of recording and reproducing compatible wide aspect ratio television signals in a form that is not affected by jitter.

[Means to solve the problem]

In order to achieve the above objectives, prior to recording, significant information superimposed on wide aspect ratio television signals that are compatible with current television systems is separated and restored using three-dimensional signal processing. By applying the processing, for example, the luminance signal Yw and chrominance signal Cw in the wide aspect ratio baseband region are demodulated, and the demodulated wide aspect ratio luminance signal Yw
.

The color signal Cl is recorded using conventional techniques, such as color under.

Then, the reproduced wide aspect ratio luminance signal Y
If w' and color signal Clight' are reproduced on a wide aspect ratio receiver, the image will be reproduced at the normal wide aspect ratio. In this case, the effects of jitter etc. are the same as when reproducing signals of the current television system, and it is possible to reproduce within a range without any practical problems.

On the other hand, this wide aspect ratio luminance signal Yw'.

If the color signal Cw' is reproduced on a receiver with the current aspect ratio, it will be reproduced as a distorted image with the horizontal direction compressed. Therefore, a wide aspect image that performs vertical compression processing by converting the number of scanning lines etc. T! Even with the JL line aspect ratio machine, image reproduction with a regular wide aspect ratio is realized.

Furthermore, the present invention is realized by digitally recording and reproducing a wide aspect ratio television signal that is compatible with 1 as a form that is not affected by jitter during recording and reproducing.

[Effect]

In the present invention, prior to recording, significant information is separated and restored by three-dimensional signal processing or the like in a jitter-free format, and is converted into a wide aspect ratio television signal in the baseband region. Therefore, even if jitter or the like occurs during the recording or playback process, this effect will only result in temporal fluctuations between the luminance signal and color signal on the reproduced image. .

On the other hand, for a wide aspect ratio television signal on which significant information is still superimposed, the method of separating and recording the luminance signal component and color signal component in a format similar to the current television system does not allow the reproduced signal to Due to the influence of jitter included,
Since it is difficult to separate and restore significant information from the reproduced signal by three-dimensional signal processing, demodulation into a wide aspect ratio baseband signal is impossible.

As described above, according to the present invention, recording.

Even if jitter or the like occurs during the reproduction process, wide aspect ratio television signals can be recorded and reproduced without being affected by this.

In addition, since digital recording methods do not, in principle, generate jitter, it is possible to separate and restore significant information using three-dimensional signal processing even for playback signals of compatible wide aspect ratio television signals. It becomes possible. Therefore, it is possible to reproduce an original wide aspect ratio image in the baseband region from this reproduced signal.

【Example〕

An embodiment of the present invention will be described below with reference to FIG. 1. This embodiment is a case in which the present invention is applied to a color under recording method used in 1M home-use VCRs and the like. Figure (a) shows the recording section.

(b) shows an example of the configuration of the playback section.

The television signal Vs is subjected to demodulation operations in the wide aspect ratio decoder circuit 1 as a wide aspect ratio television signal having 1 compatibility, that is, separation and restoration of superimposed significant information, and
Separating the luminance one color signal component is performed to generate a wide aspect ratio luminance signal Yw and color signal Cw in the baseband region.

On the other hand, the current system YC separation circuit 2 regards the television signal Vs as a television signal of the current ``N'rSC system, and generates a luminance signal Ys in the baseband region and a color signal Cm. Further, in the system discrimination circuit 3, from the television signal Vs, for example, by an identification signal, 1j
It is determined whether it is an A line N'rsc signal or a compatible wide aspect ratio television signal, and an identification signal CTS is generated.

The selection circuit 4 selects one of the signals in accordance with the identification signal CTS. In other words, if CTS shows the current system, if it shows a wide aspect ratio television signal that is compatible with system 2 of Ys and Cs, then Yw and Cs.
The signals of the w system are selected as output signals as Y and C, respectively.

In the process circuit 5, the Y and C signals are subjected to predetermined signal processing necessary for recording in the color under method, and at the same time, the recording signal
8 and record it on tape.

On the other hand, from the reproduction signal Vp reproduced from the tape.

The decoding circuit 6 reproduces the original luminance signal Y', color signal C', and m-separate signal CTS.

In the horizontal compression circuit 7, when the current aspect ratio signal is displayed on a wide aspect ratio receiver, it can be reproduced without distortion while maintaining the aspect ratio in the dot area shown in FIG. 2(a). Performs horizontal compression processing,
Further, in the shaded areas where there is no image information, signals Ysw and Cs are generated by processing such as inserting specific signals such as black and gray.

On the other hand, in the vertical compression circuit 8, when a signal with a wide aspect ratio is displayed on a receiver with a current aspect ratio, the signal can be reproduced without distortion while preserving the wide aspect ratio in the dot area shown in FIG. 2(b). As shown in FIG.
Generate Cws.

The selection circuit 9 outputs a sequence of Y sw and Csw when the identification signal CTS is a current system, and a sequence of y' and c' when CTS is a wide aspect ratio signal, as an output signal Y'w, Selectively output as Cw.

On the other hand, the 1 selection circuit 10 selects and outputs as output signals Ys and Cs the series of y' and c' when CTS is the current system, and the series of Yws and Cws when CTS is a wide aspect ratio signal. do.

According to this embodiment, it is possible to realize a recording and reproducing apparatus capable of recording and reproducing both the current system and a wide aspect ratio television signal compatible with the current system.

FIG. 3 shows one color signal C' showing an embodiment of the horizontal compression circuit.
The synchronous detection circuit 13 performs a synchronous detection operation using a single color subcarrier fsc, for example, for color difference signal processing.

Demodulates to Q. The luminance signal delayed and adjusted by the delay circuit 12 is then written to the memory circuit 14 using the write clock few.Meanwhile, reading from the memory circuit 14 is performed using the fcn clock, and the 0 color difference signal that performs horizontal compression processing is modulated. A circuit 15 performs orthogonal modulation using fsc to generate a color signal Cα. Then, the selection circuit 16 selectively controls the horizontally compressed signal series Yα, Cα and the specific signals YCT, COT to generate desired signal series of Ya and Cs. In addition, Fig. 3 (b
) shows the signals of each part.

For example, if the wide aspect ratio is 9:16,
The relationship between the frequencies of the write clock jaw and read clock fcR of the memory circuit is fcR=fcw.

FIG. 4 shows an embodiment of the vertical compression circuit. For example, I, Q
, and the luminance signal delayed and adjusted by the delay circuit 17 is sent to the scan conversion circuit 18 to generate a vertically compressed signal for each scanning line.6 For example, in the case of a wide aspect ratio of 9:16, ), adjacent four scanning line information N, N+1 . N+2. From N+3, adjacent 3
Book scanning line information N', N' +1. Generate N'+2. Therefore, 1, for example, N' is the scanning line information of N, N'+1
is the interpolation of scan line information of N+1 and N+2, and N'+2 is N+
By interpolating the scanning information of 2 and N+3, N',
N'+1. Generate information for N'+2 scan lines.

These newly generated scanning line information are written to the time axis conversion circuit 19, and a read signal whose time axis has been converted is extracted from a predetermined position as shown in FIG. 2(b). And color difference signal ■.

Q is orthogonally modulated by fsc in a modulation circuit, and as a result, Ya and Ca become vertically compressed desired signals. Then, the selection circuit 16 performs selection switching between the specific signal and the specific signal, thereby generating a signal series of Yes and Cws.

FIG. 5 shows another embodiment of the present invention. This embodiment shows an example of the configuration of a digital recording system, in which (a) shows a recording section and (b) shows a reproducing section. For input signal Vs, j
In the 111 degree chrominance pre-circuit 20, in the current system, the luminance signal component Yw and the chrominance signal component CW are converted into the luminance signal component Yw and the chrominance signal component CW. It is separated into a luminance component Yw and a color component Cw using the same method as above. Therefore, significant information is included in Yw or Cw. The data compression circuit 21 processes these signals.

For example, data is compressed by operations such as subsampling or orthogonal transformation, an error correction code is added by the encoding circuit 22, and the data is converted into a signal format suitable for digital recording and recorded. At this time, the system discrimination circuit 3 also records a CTS signal that identifies whether the signal to be recorded is the current system or a wide aspect ratio television signal.

On the other hand, the reproduced signal undergoes correction operations such as code errors that occur during reproduction in the decoder circuit 23, and signal processing such as interpolation and inverse orthogonal transformation is performed in the process circuit 24 to restore the original Yw and Cw signal sequence. do. Then, in the wide aspect ratio data circuit 25, demodulation operations such as significant information separation and restoration are performed from the Yw and Cw signal sequences, and the wide aspect ratio luminance signal y 豐t , CWI in the baseband region is obtained. Demodulate. Then, the vertical compression circuit 8 and the horizontal compression' circuit 7 each generate a signal which has been compressed as shown in FIG.
The selection circuits 9 and 10 select a desired signal sequence using the CTS signal.

Next, FIG. 6 shows another embodiment using the digital recording method. This configuration is the same as that shown in FIG. 3 above, except for the difference in the recording method, so the explanation of the operation will be omitted. .

(Effects of the Invention) According to the present invention, it is possible to provide a recording and reproducing device capable of recording and reproducing both the current system and wide aspect ratio television signals that are compatible with the current system. , compatibility with recording and playback systems is also possible,
The benefits of using VCH for home use are extremely large.

In this embodiment, the input signal is a composite signal similar to the current system, and the output signal is a luminance signal Y and two color signals C.

However, it is clear that the present invention is also applicable to separate input signals such as Y and C signals. Furthermore, a luminance signal Y is provided as an output signal.

It is also clear that C could be recombined or encoded to provide a composite form of current NTSC or compatible wide aspect ratio television signals.

In addition, although the wide aspect ratio was explained using 9:16 as an example, it is also possible to use a wide aspect ratio different from this.
It is also clear that the present invention is applicable.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a recording and reproducing circuit according to an embodiment of the present invention using an analog recording method, Fig. 2 is a functional explanatory diagram of horizontal compression and vertical compression, and Fig. 3 is a block diagram of the horizontal compression circuit and its various parts. signal waveform diagram. FIG. 4 is a circuit diagram of an embodiment of a vertical compression circuit and an explanatory diagram of scan conversion; FIG. 6 is a block diagram of a recording and reproducing circuit according to an embodiment of the present invention using a digital recording method. DESCRIPTION OF SYMBOLS 1... Wide aspect ratio decoder circuit, 2... Current system YC separation circuit, 3... System discrimination circuit, 4...
Selection circuit, 5... Process circuit, 6... Decode circuit, 7... Horizontal compression circuit, 8... Vertical compression circuit, 9
, 10... selection circuit, 11.12... delay circuit, 1
3... Periodic detection circuit, 14... Memory circuit, 15.
... Modulation circuit, 16... Selection circuit, 17... Delay circuit, 18... Scan conversion circuit, 19... Time axis conversion circuit, 20... Luminance color separation circuit, 21... Data Compression circuit, 22... Encoding circuit, 23... Decoder circuit, 24... Process circuit, 25... Wide aspect ratio decoder circuit, 26... Delay circuit. 1st (21 (α)) 3rd figure (α) 111 mouth ~ 乎, IolF word--1-1ne + period section 4th figure (α) ?1 completed Sveft xtj:%i re-perforation main cabinet

Claims (1)

[Claims] 1. Separating and demodulating significant information superimposed on a wide aspect ratio television signal that has an aspect ratio different from that of the current system and is compatible with the current system,
A method for recording and reproducing a television signal, characterized by recording a baseband region wide aspect ratio original luminance signal and a signal sequence converted into a color signal. 2. Horizontal compression for current television signals;
It has a vertical compression signal processing function for wide aspect ratio television signals, and can receive television signals of the current method and wide aspect ratio as described above with both current aspect ratio and wide aspect ratio receivers. A method for recording and reproducing television signals according to claim 1, characterized in that: 3. The method for recording and reproducing television signals according to claim 1, wherein the recording method is a digital recording method.