JPH0265581A - Recording/playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention provides a MU S for recording and reproducing band compression signals.
The present invention relates to an EE recording/playback device, and more specifically to a MUSE recording/playback device capable of recording and playing back NTSC video signals.

[Conventional Example] In recent years, various systems have been proposed for high-definition broadcasting using satellite broadcasting, and some are beginning to be realized.

One of them is MUSE (multipile).
5ub-Nyquistsa+wpling enc
This MUSE compresses a high-definition signal into a signal in the approximately 8 MHz band and transmits it. Therefore, M who records high-definition broadcasting
Various manufacturers have proposed various US VTR (VCR) devices.

[Problems to be Solved by the Invention] By the way, conventional VTR (VCR) devices that record and play back television broadcasts and videos adopt, for example, a color under recording method, and divide video signals into Y and C signals. This is one of the causes of deterioration in the characteristics of the C signal because it is separated into two channels and recorded in two channels: the FM frequency-converted Y signal and the frequency-converted C signal. In addition, the video band of the Y signal in the conventional VTR device is 2.7
8) lz (VH5) ~6.2MHz (ED Beta) (
Since the resolution is within about 220 to 500 lines), the band is narrower and the resolution is lower than that of the high-definition MUSE signal. On the other hand, in addition to television broadcasting, there are new media such as teletext broadcasting. This teletext broadcast includes data in the vertical blanking period of the television video signal, so
Conventional VTR (VCR) devices were unable to record and play back such teletext broadcasts.

This invention was made based on the idea that the above-mentioned problems could be solved by making the NTSC signal similar to a band compression signal so that it could be recorded and played back on the MUSE VTR device. In addition, the MU has little deterioration in C signal characteristics and is capable of recording and playing back NTSC television broadcasts and text multiplex broadcasts.
Our objective is to provide an SE recording/playback device.

[Means for solving the fl1 problem] In order to achieve the above object, the present invention provides a MUSE for recording and reproducing a high-definition band compressed signal (MUSE).
In the recording/playback device, the input stage has a MUSEli similar conversion means for converting the NTSC signal into a pseudo signal of the band compression signal, and the output stage has the reproduced pseudo signal.
Providing a MUSE pseudo-inverse conversion means for converting into an SC signal,
It is designed to record and reproduce NTSC signals.

[Function] With the above configuration, the NTSC signal is recorded as a high-definition band compressed signal (MUSE), and is further reproduced by reverse processing of the recording.6 Then, by the recording and reproduction, the NTSC signal becomes the MUSE signal. will have similar abilities. That is, the deterioration of the characteristics of the C signal in the conventional VTR device is reduced, the video band is widened, and the resolution is increased. Furthermore, the above-mentioned NTSC signal is continuous like the band compression signal, and since the signal can contain teletext data included in the conventional vertical blanking period, it is also possible to record and play single teletext. You will be able to do this.

[Example] Embodiments of the present invention will be described below based on the drawings.

As shown in the figure, a MUSE pseudo conversion means 2 is provided on the input (recording signal input) side of the MUSE VTRCVCR device 1 to convert an NTSC signal such as a television video signal into a signal pseudo-band compression signal. On the output (playback signal output) side, a MUSE II pseudo-inverse conversion means 3 for converting the playback signal (recorded band compression pseudo signal) into an NTSC signal is provided. Also, the MUSE compressed pseudo signal of the NTSC signal or the high-definition band compressed signal (MUS
E signal) when recording and playing back.

Field frequency switching means 4 is provided for switching the field frequency between 59.9 Hz and 60 Hz.

Note that the MUSE pseudo conversion means 2. The MUSE pseudo inverse conversion means 3 and the field frequency switching means 4 are M
It may be built into the US E VTR (VCR) device 1, or it may be used as an adapter to
It may also be possible to connect to the TR(VC)l) device 1.

The MUSE pseudo-conversion means 2 includes a pre-filter section 5 for manually converting the NTSC signal to a frequency of 8.1 MHz or less to prevent aliasing, and an NT signal that has passed through the pre-filter section 5.
A sample and hold section 6 samples and holds the SC signal at a sampling frequency of 16.2MHz, and a sample and hold section 6 that samples and holds the SC signal at a sampling frequency of 16.2MHz, and digitally converts the sampled and held NTSC signal (
an A/D converter 7 that converts the 525 scanning lines of a digital NTSC signal into 1125 lines, and an NTSC signal obtained by the scanning line converter 8. and a MUSE pseudo-signal converter 9 which converts the signal into a band-compressed pseudo-signal.

Further, the MUSE pseudo-inverse conversion means 3 is configured to convert the MUSE
In order to perform the process opposite to II-like conversion means 2, M U
The scanning line of the digital NTSC signal obtained by the MUSE pseudo signal converter 10 which converts the reproduced signal from the SEVTR (VCR) device 1 into a digital NTSC signal. 11
a scanning line inverse conversion unit 11 that inversely converts 25 lines into 525 lines;
a D/A converter (8 bits) 12 that converts the NTSC signal converted by the scanning line inverse converter 11 into analog;
The frequency of outputting this analog NTSC signal is approximately 8.1
M) lz low-pass filter (LPF) section 13.

Next, the above configuration (7) MU S E V T R (
(VCR) device operation will be explained.

First, assuming that the signal recorded on the MUSE VTR device is an NTSC system such as a television video signal, the field frequency switching means 4 is switched to the NTSC side. The switching operation is performed in conjunction with the NTSC recording operation of the MUSE VTR device 1, for example. Also, MUS
When the EVTR device 1 is operated for normal MUSE recording, the field frequency switching means 4 is switched to the MUSE side.

Then, the NTSC data input to the MUSEI-like conversion means 2
The signal is sampled at a sampling frequency of 16.2 Nl (z), which is the same as the band compression signal, and converted to an 8-bit digital signal.This digital NTSC signal has 525 scanning lines, so it conforms to the MUSE signal standard. The input NTSC signal is converted into 1125 scanning lines and converted into a band-compressed pseudo signal.That is, the input NTSC signal is made into a signal similar to the band-compressed signal, and is made recordable by the MUSE VTR device 1. In addition, the band compression pseudo signal includes an NTSC signal (video signal, etc.) in the portion corresponding to the control signal, etc. of the band compression signal (MUSE signal), and is added to the audio signal multiplexed during the vertical blanking period. Teletext data can be placed in the corresponding part.

The band compression pseudo signal obtained in this way is as follows.

Recorded in the MUSE VTR device 1.1. ::(7)MUS
When the EVTR device 1 is operated for reproduction, the field frequency switching means 4 is switched to the NTSC side in the same manner as described above.

Then, the recorded band compression pseudo signal (reproduction signal) is output from the output of the MtJSEVTR device 1. Then, the band-compressed pseudo signal is a digital NT
The signal is returned to an SC signal, resulting in 525 scanning lines, and further converted to an analog signal.

In this way, the video band of the reproduced NTSC signal can be as wide as about 8.1 MHz, so according to the present invention, it is possible to increase the resolution to about 650 lines.

Further, it is possible to reduce the deterioration of the characteristics of the C signal due to the one-sided color under method.

Furthermore, with conventional VTR devices, data included in the vertical blanking period of a television video signal, such as in teletext broadcasting, cannot be played back.However, with the high-definition VTR device of the present invention, Since the band compressed signals to be recorded and played back are continuous, the above-mentioned teletext broadcasting etc. can be converted into band compressed pseudo signals and recorded, and can also be played back.

[Effects of the Invention] As explained above, according to the MUSE VTR device of the present invention, the input stage is provided with a MUSE pseudo conversion means for converting the N5TC signal into a band compression pseudo signal, and the output stage converts the band compression pseudo signal into an NTSC signal. Since it is equipped with a MUSEli-like conversion means for converting into signals, it is possible to record and play back NTSC video signals, and the signal band is approximately 8.1
It can be used in a wide range of MHz and can be expected to increase resolution.

Further, according to the present invention, unlike the color under one-sided system, the Y signal and C signal separated from the input NTSC signal are included in the band compression signal and the pseudo signal, so that it is possible to reduce the characteristic deterioration of the C signal. can.

Furthermore, according to the present invention, since a human-powered NTSC signal is converted into a signal that simulates a band compression signal, it is possible to convert a teletext signal in which data is included in the vertical blanking period of a television video signal, such as in teletext broadcasting. It is possible to record and reproduce broadcasts, etc., and also to record and reproduce more signals (including their data), which has the effect of further expanding the range of use.

[Brief explanation of the drawing]

The drawing is a schematic circuit block diagram of a MUSE VTR device showing an embodiment of the present invention. In the figure, 1 is a MUSE VTR (VCR) device, 2 is a MUSE pseudo-conversion means, 3 is a MUSE pseudo-inverse conversion means, 4 is a field frequency switching means, 5 is a pre-filter section, and 6 is a sample-hold section. , 7 is an A/D converter, 8 is a scanning line converter, 9 is a MUSE pseudo signal converter, 1
0 is MUSE* similar signal inverse conversion section, 11 is scanning line inverse conversion section, 12 is D/A conversion section, 13 is low pass filter (LPF)
Department. patent

Claims (2)

[Claims] (1) M for recording and reproducing high-definition band compression signals
In the USE recording/playback device, an input stage is provided with a MUSE pseudo conversion means for converting the NTSC signal into a pseudo signal of the band compression signal, and an output stage is provided with a MUSE pseudo inverse conversion means for converting the reproduced pseudo signal into an NTSC signal. 1. A high-definition band compressed signal (MUSE) recording/playback device, characterized in that it is configured to record and play back NTSC signals. (2) The MUSE pseudo-conversion means includes a pre-filter section with a frequency of 8.1 MHz or less that inputs the NTSC signal, and a sample-hold section that samples and holds the NTSC signal that has passed through the pre-filter section at a sampling frequency of 16.2 MHz. , an A/D converter that converts the sampled and held NTSC signal into digital, and a scanning line 5 of the NTSC signal converted into digital.
Consisting of a scanning line conversion unit that converts 25 lines into 1125 lines, and a MUSE pseudo signal conversion unit that converts the digital NTSC signal converted by the scanning line conversion unit into a signal that simulates the band compression signal, The MUSE pseudo-inverse converter includes a MUSE pseudo-signal inverse converter that converts the reproduced pseudo-signal into a digital NTSC signal, and a scanning line 1125 of the digital NTSC signal obtained by the MUSE pseudo-signal inverse converter. A scanning line inverse converter that converts a book into 525 lines, a D/A converter that converts the digital NTSC signal obtained by this scanning line inverse converter into an analog one, and a low-level converter that outputs this analog NTSC signal. The high-definition band compressed signal (MUSE) according to claim (1), comprising a bandpass filter section.
Recording/playback device.