JP3049835B2 - Video signal recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-definition video signal recording / reproducing apparatus capable of recording / reproducing a high-definition video signal.

[0002]

2. Description of the Related Art In recent years, various systems have been proposed for hi-vision broadcasting using satellite broadcasting, and some of them have begun to be realized. One of them is MUSE (multiple sub-nyq
The MUSE method is a method of compressing a Hi-Vision signal into a signal of about 8 MHz band and transmitting the compressed signal.

[0003]

By the way, if a plurality of signal formats exist as described above, a recording / reproducing apparatus (hereinafter, referred to as a VTR) will be described.
Must also be prepared for each. That is, in a high-definition signal VTR, a MUSE signal or N
TSC signal cannot be recorded / reproduced, MUSE signal VT
R cannot record / reproduce high-vision signals or NTSC signals. Furthermore, VSCs for NTSC signals that are currently widely used
Similarly, TR records / records Hi-Vision signals and MUSE signals.
It cannot be played. Therefore, a dedicated VTR is required for each signal format, which is inconvenient.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a video signal recording / reproducing apparatus capable of recording / reproducing a Hi-Vision signal. Converts to a multiplexed pseudo high definition video signal and sends it to the recording / playback processing unit as a recording signal
Pseudo HDTV signal conversion means that can be supplied
Provided further output stage, a pseudo HD signal supplied reproduced by the recording and reproduction processing unit, movies NTSC four systems
Pseudo high-definition that can be converted to an image signal and output
Signal inversion means for converting four NTSC video signals
The video signal recording / reproducing apparatus is configured so that recording / reproducing can be performed simultaneously .

[0005]

[Function] One frame of a high-definition signal is composed of data of 2200 dots in a horizontal direction for each of 1125 scanning lines (line frequency: 33750 Hz, sampling frequency: 74.25M).
Hz).

On the other hand, NTSC signals are converted to 4f _SC (14.32 MHz).
1 frame when sampled and digitized by
Each of the 25 scanning lines is formed of 910 dot data (line frequency: 15.7343 kHz) in the horizontal direction. Therefore, it is possible to record four NTSC signals (one frame each) corresponding to one frame of the HDTV signal.

[0007] One frame of the MUSE signal is 112
Each of the five scanning lines is formed of data of 480 dots in the horizontal direction (line frequency: 33750 Hz, sampling frequency 16.2 MHz). Here, this 480
Even in consideration of the fact that all dots become effective pixels, it is possible to record two MUSE signals (one frame each) corresponding to one frame of a high-definition signal.

[0008]

FIG. 1 shows an embodiment of a video signal recording / reproducing apparatus according to the present invention. Reference numeral 1 denotes a recording / reproducing processing section as a high-definition VTR, and an input terminal for recording a high-definition signal. A high-definition signal input through a switch circuit 3 controlled to a contact a from 2 is subjected to predetermined processing such as recording signal processing and FM modulation, and is wound around a head drum equipped with a magnetic head and travels. When a high-definition signal is recorded on a magnetic tape to be reproduced, the reproduction signal obtained from the magnetic head is subjected to predetermined reproduction processing such as reproduction frequency compensation, FM demodulation, and TBC processing, and is connected to a contact as a high-vision signal. It outputs a playback Hi-Vision signal from an output terminal 5 via a controlled switch circuit 4. According to the present invention, the signal recording method in the recording / reproducing processing unit 1 is as follows.
It does not matter whether it is analog or digital.

On the other hand, an NTSC / MUSE input / output unit 10 surrounded by a dashed line is connected to the b contacts of the switch circuits 3 and 4.
The system NTSC signal is converted into a pseudo Hi-Vision signal and supplied to the recording / reproducing processing unit 1 to perform a recording operation, and the pseudo Hi-Vision signal, which is the reproduction signal, is inversely converted into four NTSC signals. It is something that can be output.

Further, when two MUSE signals are input, they are converted into pseudo Hi-Vision signals and recorded / recorded.
The recording operation is performed by supplying the reproduced signal to the reproduction processing unit 1, and the pseudo high definition signal, which is the reproduction signal, is inversely converted into two MUSE signals and output.

11A, 11B, 11C and 11D are A,
Input terminals for composite NTSC signals of B, C, and D systems, each of which can receive composite NTSC signals from various video sources such as a VTR, a tuner, and a video disk.

Reference numerals 12A, 12B, 12C, and 12D denote pre-filters, which function as band-limiting filters for preventing aliasing distortion when digitally converting an NTSC signal. 13A, 13B, 13C and 13D respectively convert the NTSC signals input through the pre-filters 12A, 12B, 12C and 12D into 4f _SC1 , 4f _SC2 ,
This is an A / D converter that samples with the 4f _SC3 and 4f _SC4 sampling clocks and converts it into a digital signal.
Incidentally, A / D converter 13C, prefilter 12C for 13D, the output of the 12D is inputted through a contact point of the switching circuit S _1, S _2.

11E and 11F are MUSE of A and B two systems.
These are signal input terminals, and can be supplied from various video sources such as VTRs, tuners, and video disks, similarly to NTSC signals. 12E and 12F are pre-filters for the input MUSE signal.

MUs of the A system from input terminals 11E and 11F
When the SE signal and the MUSE signal of the B system are input, the switching circuits S ₁ and S ₂ are respectively controlled to be switched to the b contacts, whereby the pre-filters 12E, 1
Each MUSE signal output from the 2F is an A / D converter 13
C, 13D. At this time, the A / D converter 13
A signal of 16.2 MHz is supplied to C and 13D as a sampling clock, and sampling and A / D conversion operations are performed.

Reference numerals 14A, 14B, 14C, and 14D denote memory units, which are converted into digital signals by the A / D converters 13A, 13B, 13C, and 13D when an NTSC signal is input (scanning line 1). 910 samples of NTSC data per line) and write clocks W _CK1 , W
Write and read clocks R _CK1 , R _CK2 , R _CK3 , R _CK4 (= _CK 4) at the timing of _{CK 2} , W _CK3 , W _CK4 (= 4f _SC )
74.25MHz).

The memory units 14A, 14B, 1
The read clocks R _CK1 , R _CK2 , R _CK3 , and R _{CK4 of} 74.25 MHz for controlling the read operations of 4C and 14D are supplied such that the read timings are shifted from each other.
The four NTSC signals are multiplexed in a time-division manner and supplied to the contact b of the switch circuit 3 as a pseudo HD signal.

When the MUSE signal is input,
Write clock W supplied to memory units 14C and 14D
_CK3 and W _CK4 are supplied as signals of 16.2 MHz, that is, the outputs converted into digital signals by the A / D converters 13C and 13D (MUSE data of 480 samples per scanning line) are written into the write clock W _CK3 , W _CK4 (= 1
6.2MHz) write and read clock R
Reading is performed at the timing of _CK3 and _RCK4 (= 74.25 MHz).

The read clocks R _CK3 , R _{CK of} 74.25 MHz for controlling the read operation of the memory units 14C, 14D
By supplying _{CK4 so} that the read timings are shifted from each other, the MUSE signals of the two systems are multiplexed in a time-division manner and supplied to the contact b of the switch circuit 3 as a pseudo HD signal.

On the other hand, through the contact b of the switch circuit 4,
The reproduction signal from the recording / reproduction processing unit 1 is transmitted to the memory unit 21A,
21B, 21C, and 21D. Playback signal is 4
If the NTSC signal of the system which is a reproduction signal for the signals recorded is converted into a pseudo HD signal, the memory unit 21A, 21B, 21C, the write clock W _CK5 respect 21D are respectively inputted signal, W _CK6 , W _CK7 ,
Write at the timing of W _CK8 (= 74.254MHz),
Read clock _{R CK5, R CK6, R CK7} , R CK8 (= 4f
Data is read at the timing of _SC ).

The memory units 21A, 21B, 21
The data read from C and 21D is a D / A converter 22
A, 22B, 22C, and 22D convert the analog signals into analog signals.
Composite NT via A, 23B, 23C, 23D
Output terminals 24A, 24B, 24C, 24 as SC signals
D.

When the reproduced signal is a signal obtained by converting a two-system MUSE signal into a pseudo Hi-Vision signal and recording it, the memory units 21C and 21D write the input signals respectively. Clock W _CK7 ,
Write at the timing of W _CK8 (= 74.254MHz),
Read clocks R _CK7 , R _{CK 8} whose frequency is 16.2 MHz
The data is read based on.

The data read from the memory units 21C and 21D are converted into analog signals by D / A converters 22C and 22D, and the analog signal output is output as reproduced MUSE signals via post filters 23E and 23F. It is supplied to terminals 24E and 24F.

[0023] 31 is a clock generator, each supplied to the respective circuit portions clock (4f _SC1 ~4f _SC8, 16.2MHz
). Reference numeral 32 denotes a control signal generator,
Write clocks W _{CK1 to} W _CK8 and read clocks R _{CK1 to} R _CK supplied to the memory units 14A to 14D and 21A to 21D.
_CK8 is generated.
The field frequency is set to 59.9 Hz when recording / reproducing a pseudo Hi-Vision signal converted from the TSC signal and when recording / reproducing a Hi-Vision signal converted from the input terminal 2 or the MUSE signal. 60
Generates a control signal to control switching in Hz.

In this embodiment, the NTSC / MUS
Since the E input / output unit 10 is configured, the recording / reproducing operation of the four NTSC signals can be performed simultaneously by the recording / reproducing processing unit 1 compatible with the HDTV system, and the two MUSE signals can be simultaneously transmitted to the HDTV system. The corresponding recording / reproducing processing unit 1 can perform the recording / reproducing operation. The operation of the NTSC / MUSE input / output unit 10 will be described below with reference to FIGS.

First, the operation when four NTSC signals are input will be described with reference to FIGS. Input terminals 11A, 11
As shown in FIGS. 2A to 2D, when NTSC signals of four systems A, B, C, and D are input from B, 11C, and 11D, A / D converters 13A and 13A, respectively, as described above.
B, 13C, and 13D are converted into digital signals.
As shown in (e) to (h), the frequency is 4f _SC (= 14.32M
Hz) The write clocks W _{CK 1} , W _CK2 , W _CK3 , and W _CK4 are used to write the data into the memory units 14A, 14B, 14C, and 14D. The n-th field of the A-system NTSC signal is represented by Fn _(A) , and the n-th field of the B-system NTSC signal is represented by Fn.
_(B) . Similarly, Fn _(C) ,
Fn _(D) .

Then, 7 for the memory units 14A and 14C
4.25 MHz read clocks R _CK1 and R _{CK 3} and memory unit 1
The read clocks R _CK2 and R _CK4 for 4B and 14D are supplied alternately in a time-division manner on a field basis as shown in FIGS. 2 (i) to (l). In this case, digital video signals of the A and C systems and digital video signals of the B and D systems at a rate of 74.25 MHz are supplied alternately for each field. That is, (Fn _(A) , Fn _(C) ), (Fn _(B) ,
Fn _(D) ), (Fn + 1 _(A) , Fn + 1 _(C) ), (Fn + 1 _(B) , Fn +
1 _(D) ).

Here, the A system and the C system, and the B system and the D system
The systems are distinguished by being read in a time-division manner on a horizontal line basis. FIG. 3 shows the memory unit 14 in the period T _{1 of} FIG.
A shows processing in line units during a period in which data is read from A and 14C. The nth horizontal line of the NTSC signal of the A system is indicated as Ln _(A) , and the same applies to the B to D systems as Ln _(B) , Ln _(C) , and Ln _(D) .

The read clock R memory unit 14B as can be seen from FIG. 2 in this period T _1, relative to 14D
_CK2 and _RCK4 are not supplied, and FIG.
As can be understood from the above, only the read clocks R _CK1 and R _CK3 are alternately supplied to the memories 14A and 14C in the line cycle, and therefore Ln _(A) , Ln _(C) , Ln + 1 _(A) and Ln + 1 _(C)
... The reading operation is performed in the order of. Therefore, as shown in FIG. 3 (m), the A / NTSC signal and the C / NTSC signal are alternately supplied to the recording / reproducing processing unit 1 on a line basis.

On the other hand, for example, period T ₂ in FIG. 2, namely in the period in which the memory portion 14B when viewed in units of fields, the data from the 14D being read, the processing of the line unit is illustrated in FIG. That read clock R _CK1, R _CK3 is not supplied to the memory section 14A, 14C As can be seen from FIG. 2 in this period T _2,
As understood from FIGS. 4 (i) to (l), the memories 14B,
For 14D, only the read clocks R _CK2 and R _CK4 are alternately supplied in the line cycle, and therefore Ln _(B) , Ln _(D) , Ln
The reading operation is performed in the order of n + 1 _(B) , Ln + 1 _(D) ... For this reason, the recording / playback processing unit 1 is
As shown in (m), the NTSC signal of the B system and the NTSC signal of the D system are alternately supplied in line units.

The signals read from these memory sections 14A to 14D are supplied as pseudo high definition signals to the recording / reproduction processing section 1 through the contact b of the switch circuit 3 as recording signals. R _{CK1 to} R
_As the supply timing of _CK4 is set as described above, this pseudo high definition signal becomes as shown in FIG.
Four NTSC signals, that is, NTSC signals for four frames are formed so as to correspond to one frame of the Hi-Vision signal. Therefore, the magnetic tape has four different NT systems in the recording area for one frame of the Hi-Vision signal.
The SC signal can be recorded one frame at a time, and the NTSC signal is recorded using a magnetic tape very efficiently in a high definition VTR.

On the other hand, the operation when the thus recorded pseudo Hi-Vision signal (= 4 NTSC signals) is reproduced by the recording / reproducing processing section 1 is shown in FIGS. In this case, when the reproduction signal from the recording / reproduction processing unit 1 is viewed on a field basis, as shown in FIG.
And D system in the order of the fields and supplied to the memory units 21A, 21B, 21C and 21D. Then, the write clocks W _CK5 , W _{CK of} frequency 74.25 MHz for controlling the write operation of the memory units 21A, 21B, 21C, 21D
_CK6, W _CK7, W _CK8 is supplied to the time division manner alternately at predetermined timings as shown in FIGS 6 (b) ~ (e) , that is, the reproduction signal A, B, C, D in each system Select and write.

Of course, the operation of selecting and writing the A system and the C system in the memory units 21A and 21C, and the operation of selecting and writing the B system and the D system in the memory units 21B and 21D are shown in FIGS. Is achieved by alternately supplying the write clocks _WCK in line units as shown in FIG.

That is, for example, during the period T ₃ in FIG. 6, Ln _(A) , Ln _(C) , Ln + 1 _(A) ,
The reproduction signals are supplied in the order of Ln + 1 _(C) ..., And in accordance with this, the write clock W _CK5 and the write clock W _{CK7 as} shown in FIGS. Are alternately supplied to the memory units 21A and 21C, so that only the reproduction signal of the A system is written in the memory unit 21A, and the C signal is stored in the memory unit 21C.
Only the reproduction signal of the system is written.

Further, in the example period T ₄ in FIG. 6, as shown in FIG. _{8 (a) Ln (B)} , Ln (D), Ln + 1 (B),
The reproduction signals are supplied in the order of Ln + 1 _(D) ..., And in accordance with this, the write clock W _CK6 and the write clock W _{CK8 as} shown in FIGS. Are alternately supplied to the memory units 21B and 21D, so that only the B-system reproduced signal is written into the memory unit 21B, and the D signal is written into the memory unit 21D.
Only the reproduction signal of the system is written.

The data written based on the write clocks W _{CK5 to} W _CK8 are read clocks R _CK5 and R _CK5 of the frequency 4f _SC for controlling the read operation, respectively.
_CK6, R _CK7, R _CK8 memory portion 21A at the timing shown in FIG. 6 (f) ~ (i) , 21B, 21C, which are read out is supplied to 21D, D / A converters 22A, 22B, 2
2C and 22D are analog signals.
As shown in (j) to (m), NTSCs of the A system to the D system
The video signals are supplied to the output terminals 24A to 24D.

As described above, in the video signal recording / reproducing apparatus of this embodiment, the NTSC / MUSE input / output unit 10 multiplexes the four NTSC signals in a time-division manner to generate a pseudo Hi-Vision signal. In a VTR, NTSC signals can be recorded on four channels simultaneously, and when recording NTSC signals, the recording area of a magnetic tape as a recording medium is very effectively used.

Next, the operation when two MUSE signals are input will be described with reference to FIGS. Input terminals 11E, 1
As shown in FIGS. 9 (a) and 9 (b), when the MUSE signals of the A and B systems are input from 1F, the signals are converted into digital signals by the A / D converters 13C and 13D, respectively, as described above. c) As shown in (d), the write clocks W _CK3 and W _CK4 having a frequency of 16.2 MHz enable the memory units 14C and 14
Written to 14D.

Then, 7 for the memory units 14C and 14D
The read clocks R _CK3 and R _{CK 4} of 4.25 MHz are shown in FIG.
As shown in (f), when viewed in field units, they are supplied simultaneously, and at this timing, digital video signals of the A and B systems at a rate of 74.25 MHz are output to the recording / reproduction processing unit 1. . Note that A is the same as in FIG.
The nth field of the MUSE signal of the system is represented by Fn _(A) , and the nth field of the MUSE signal of the B system is represented by Fn _(B) .

Here, the MUSE signal of the A system and the MUSE signal of the B system are distinguished from each other by being read in a time-division manner in units of horizontal lines. Figure 10 shows example T ₅ period in FIG. 9, i.e. memory section 14C as viewed in a field unit, the processing units of lines in the period in which the read operation is being performed the data 14D. A, B
Similarly, Ln _(A) , L
Shown as n _(B) .

The read clock R with respect to the memory section 14C, 14D as can be seen from FIG. 9 in this T ₅ period
_{Although CK3} and _RCK4 are supplied at the same time, FIG.
As understood in (f), the read clocks R _CK3 and R _CK3
CK4 is supplied alternately in a two-line cycle, so in this case, Ln _(A) , Ln _(B) , Ln + 1 _(B) , Ln + 1 _(A) , Ln + 2 _(A) ,.
Are performed in this order. Therefore, as shown in FIG. 10 (g), the MUSE signal of the A system and the MUSE signal of the B system are alternately supplied to the recording / reproduction processing unit 1 every two lines.

The signals read from the memory sections 14C and 14D are supplied as pseudo high definition signals to the recording / reproduction processing section 1 through the contact b of the switch circuit 3 as recording signals. Clock R _CK3 ,
By _setting the supply timing of R _CK4 as described above, this pseudo high definition signal becomes a two-system MUSE signal, that is, a two-frame MUS signal, as shown in FIG.
The E signal is formed so as to correspond to one frame of the HDTV signal.

Accordingly, the high-definition signal 1 is recorded on the magnetic tape.
Two different MUSE signals can be recorded in the recording area for one frame at a time, one frame at a time. This also makes it possible to use the magnetic tape efficiently in a high definition VTR. Note that the read clocks R _CK3 , R _CK
When the supply of _CK4 is controlled, the first field of the A system is sequentially arranged in two rows in line units as shown in an enlarged view in FIG. 12, so that one field of the MUSE signal corresponds to the horizontal direction. 960 dots, 112 in the scanning line direction
This corresponds to a 領域 recording area.

On the other hand, the operation when the thus recorded pseudo Hi-Vision signal (= two MUSE signals) is reproduced by the recording / reproduction processing section 1 is shown in FIGS.
In this case, when the reproduction signal from the recording / reproduction processing unit 1 is viewed in field units, the A system and the B system are simultaneously output as shown in FIG. 13A, and are supplied to the memory units 21C and 21D. , 21D, write clocks W _CK7 , W _CK8 having a frequency of 74.25 MHz are supplied as shown in FIGS. 13B and 13C to write the reproduced signal.

[0044] Here, selection of the A system and the B system to be written memory unit 21C, in 21D, the write clock W _CK to alternately line by line as shown in FIG. 14 is achieved by supplying. That is, in the example T ₆ period in FIG. 13, as shown in FIG. _{14 (a) Ln (A)} , Ln (B), Ln +
Playback signals are supplied in the order of 1 _(B) , Ln + 1 _(A) ...
At the same time, the write clock W _CK7 and the write clock W _CK8 are alternately changed as shown in FIGS.
1C and 21D, only the reproduction signal of the A system is written in the memory unit 21C, and the memory unit 21D
Only the reproduction signal of the B system is written in.

The data written on the basis of the write clocks W _CK7 and W _CK8 are read clocks R _CK7 and R CK of frequencies 16 and 2 MHz for controlling the read operation, respectively.
_CK8 is supplied to and read from the memory units 21C and 21D at the timings shown in FIGS. 13D and 13E, converted into analog signals by the D / A converters 22C and 22D, and supplied to the post filters 23E and 23F. , Respectively, as shown in FIG.
As shown in (g), the MUSE video signals of the A system and the B system are supplied to the output terminals 24E and 24F.

As described above, in the video signal recording / reproducing apparatus of the present embodiment, the NTSC / MUSE input / output section 10 multiplexes two MUSE signals in a time-division manner to generate a pseudo Hi-Vision signal. In the VTR, the MUSE signal can be simultaneously recorded and reproduced on two channels, and when recording the MUSE signal, the recording area of the magnetic tape as a recording medium can be effectively used.

When recording / reproducing the four NTSC signals and the two MUSE signals as described above, the memory units 14A to 14D and 21A to 21D for multiplexing the signals of each system in a time-division manner. The timing control of the write clock and the read clock supplied to 21D is not limited to the above example, but may be various. And, of course, the form of the pseudo Hi-Vision signal shown in FIG. 5 or FIG. 11 changes depending on the timing setting of the read clock of the memory units 14A to 14D.

The NTSC / MUSE input / output unit 1
0 is built in the video signal recording / reproducing apparatus and configured as an input stage and an output stage of the recording / reproducing processing unit 1. For example, the NTSC / MUSE input / output unit 10
It is anticipated by the present invention that the high-definition VTR having the reproduction processing unit 1 is configured separately from the high-definition VTR as an adapter for recording an MTSC signal or a MUSE signal.

Also, in the above embodiment, NTS within four systems
The C signal or the MUSE signal within two systems can be simultaneously recorded / reproduced. However, the write / read control of the memory section and the internal processing (switching of the field frequency) of the recording / reproduction processing section 1 are taken into consideration. One MUSE and two N
It is conceivable to simultaneously record / reproduce the TSC signal.

[0050]

As described above, the video signal recording / reproducing apparatus according to the present invention comprises four systems of N in a high definition VTR.
A pseudo Hi-Vision signal converting means for converting a TSC video signal into a pseudo Hi-Vision signal multiplexed in a time-division manner and supplying it as a recording signal, and converting a pseudo Hi-Vision reproduction signal reproduced by a recording / reproducing processing unit into four NTSC video signals
By providing a pseudo HD signal inverse converting means capable of and outputs simultaneously the NTSC signal of 4 strains
In addition to the effect that recording / reproducing can be performed, four NTS systems are provided in the recording area for one frame of the Hi-Vision signal.
C signal can be recorded for each frame.
When recording SC signals, the recording area of the recording medium is very
There is an effect that it can be used effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram in a field unit of an operation of generating a pseudo Hi-Vision signal from four NTSC signals according to the present embodiment.

FIG. 3 is an explanatory diagram of an operation of generating a pseudo Hi-Vision signal from four NTSC signals in a line unit according to the embodiment;

FIG. 4 is an explanatory diagram of a line-by-line operation of a pseudo HD signal generation operation from four NTSC signals according to the embodiment;

FIG. 5 is an explanatory diagram of a recording area of a pseudo Hi-Vision signal from four NTSC signals according to the present embodiment.

FIG. 6 is an explanatory diagram in a field unit of an operation of generating four NTSC signals from a pseudo MUSE reproduction signal according to the present embodiment.

FIG. 7 is an explanatory diagram in line units of an operation of generating four NTSC signals from a pseudo MUSE reproduction signal according to the present embodiment.

FIG. 8 is an explanatory diagram in a line unit of an operation of generating four NTSC signals from a pseudo MUSE reproduction signal according to the present embodiment.

FIG. 9 is an explanatory diagram in a field unit of an operation of generating a pseudo Hi-Vision signal from two MUSE signals in the present embodiment.

FIG. 10 is an explanatory diagram for each line of an operation of generating a pseudo high definition signal from two MUSE signals according to the present embodiment.

FIG. 11 is an explanatory diagram of a recording area of a pseudo Hi-Vision signal from two MUSE signals of the present embodiment.

FIG. 12 is an explanatory diagram of a recording area of a pseudo Hi-Vision signal from two MUSE signals of the present embodiment.

FIG. 13 is an explanatory diagram in a field unit of an operation of generating two systems of MUSE signals from a pseudo MUSE reproduction signal according to the present embodiment.

FIG. 14 is an explanatory diagram in line units of an operation of generating two systems of MUSE signals from a pseudo MUSE reproduction signal according to the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Recording / playback processing part 1 2 Hi-vision input terminal 3, 4 Switch circuit 5 Hi-vision output terminal 11A, 11B, 11C, 11D NTSC signal input terminal 11E, 11F MUSE input terminal 12A, 12B, 12C, 12D, 12E, 12F Pre-filter 13A, 13B, 13C, 13D A / D converter 14A, 14B, 14C, 14D, 21A, 21B, 2
1C, 21D memory unit 22A, 22B, 22C, 22D D / A converter 23A, 23B, 23C, 23D, 23E, 23F Post filter 24A, 24B, 24C, 24D NTSC signal output terminal 24E, 24F MUSE signal output terminal

Claims (1)

(57) [Claims] 1. A video signal recording / reproducing apparatus capable of recording / reproducing a Hi-Vision signal, comprising: a recording / reproducing processor for converting an NTSC video signal of four systems into a pseudo Hi-Vision signal multiplexed in a time division manner at an input stage; Can be supplied as a recording signal to the recording / reproduction processing unit.
A pseudo Hi-Vision signal conversion means is provided, and a pseudo Hi-Vision signal reproduced and supplied by a recording / reproducing processing unit is converted into a four-system NTSC video signal at an output stage.
Pseudo HD signal inverse conversion that can be output
Means for recording and reproducing four NTSC video signals simultaneously .