JPH11150739A - Recording and reproducing device with reproducing system converting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost and to improve handleability by providing a first converting means converting a chrominance signal into the chrominance sub-carrier frequency of a PAL system and outputting it at the time of reproducing a magnetic tape recorded with a video signal of an NTSC system. SOLUTION: At a custom coder 71 of the NTSC system with a PAL converting function, a camera part and a VTR part are made in one body to record and reproduce corresponding to an NTSC standard through the use of a magnetic tape 72 for NTSC and to output signals of the system corresponding to an NTSC broadcasting system as output signals. Consequently, normal reproduction is executed by connecting to the television set 73 of the NTSC system but at the time of reproducing by connecting to the television set 74 of the PAL system, reproduction is executed by switching to PAL conversion. This PAL converting function is provided with a mode for converting the chrominance signal of NTSC into the chrominance sub-carrier frequency of the PAL system and a mode for converting the chrominance signal of 4.43 NTSC into the state of the PAL signal by converting a burst phase so as to position a burst signal at 135 deg. and alternating every one horizontal scanning period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus capable of recording / reproducing a video signal and a composite video signal from an image pickup device, and more particularly to a video / tape recorder (hereinafter referred to as a camcorder) and a disk apparatus. The present invention relates to a camera-integrated recording / reproducing apparatus having a system conversion function of converting a color signal into a signal of another broadcast system in a system.

[0002]

2. Description of the Related Art Current television broadcasting systems include the NTSC system employed in North America and Japan, the PAL system employed in Europe, Southeast Asia and the Middle East, and the SECAM system in France. In general, home video tape recorders (hereinafter abbreviated as VTRs) are commercialized as VTRs suitable for the broadcasting system for each region where they are used.

[0003] In Southeast Asia and the Middle and Near East countries, a large number of NTSC soft tapes are flowing in from North America and Japan, and stationary VTRs and the like compatible with both PAL and NTSC broadcasting systems have been commercialized. For example, for the reproduction of NTSC soft tapes with high needs,
Many multi-system VTRs having the function of converting to an AL signal and devising to display an image on a PAL television have been commercialized.

[0004] With regard to such a broadcasting system conversion technology,
Technical Report of the Institute of Television Engineers of Japan Vol.14, NO20, PP.37-42, VI
R'90-17 (April 1990). This prior art includes an encoder including frequency conversion of a color signal and the like;
It has a function of performing conversion of different scanning lines between the SC and PAL, and aims at high conversion performance. And
It states that the goal is not only to prevent performance degradation but also to reduce the cost so that it can be installed in a home VTR. And according to this, NTSC / PAL
Since it is possible to freely convert both broadcast signals, it is easy to communicate between different broadcasting systems such as a wide range of overseas exchanges, and to minimize degradation in performance, improve the quality of converted signals, and this is an extremely effective technology. .

[0005]

However, the above-mentioned prior art also describes an LSI implementation in consideration of application to a home VTR on the premise of cost reduction. It is not clear whether the concept is to be applied to home VTRs with a simple concept. In other words, it does not describe how the method conversion technique is specifically applied to an actual product. Also,
Almost no specific method of modulating a color signal is described.

For example, with the recent internationalization, opportunities to live abroad such as long-term business trips and overseas trips have increased, and home electric appliances for overseas use have been required in many cases.
Specifically, in the case of a stationary VTR, if a VTR that supports multi-broadcasting is purchased for overseas use, there is an advantage in that NTSC soft tapes can be seen in the PAL system area, but the cost is high. There is a problem. Further, in the case of a camcorder, for example, even if a camcorder purchased in the NTSC area is used to shoot in the PAL area, it is impossible to project the image on a local PAL television. Similarly, even if a tape taken with a camcorder purchased within the PAL area is brought back to the NTSC system nation, the captured soft tape is in the PAL broadcast system, so the domestic NTS system
This is inconvenient because it cannot be displayed on a C-type television.
In other words, conventional camcorders have the inconvenience of not being able to easily view the images of family members or important information taken overseas with NTSC camcorders easily. There is an inconvenience that you cannot easily see it when you return home.
By applying the above-described conventional technology to such a camcorder, it is possible to realize both NTSC / PAL conversion. However, the camcorder is 100% converted from the viewpoint of miniaturization, low power consumption, and low cost. Products with functions
There is a problem that the function is too heavy.

Therefore, there is a demand for a low-cost recording / reproducing apparatus of a specific broadcasting system or recording / reproducing system having a reproducing system conversion function capable of easily reproducing data in another system. SUMMARY OF THE INVENTION An object of the present invention is to provide a low-cost and easy-to-use recording / reproducing apparatus with a reproducing method conversion function to meet such needs.

[0008]

According to the present invention, in order to achieve the above object, in the case of an NTSC system recording / reproducing apparatus, when reproducing a magnetic tape on which an NTSC signal is recorded, a color signal is converted to a PAL system color signal. Subcarrier frequency (4.43361875MHz)
And a conversion means for converting and outputting the converted data. That is, the number of scanning lines remains 525 in the NTSC system, and the field frequency remains 60 Hz. Thus, the PAL system television having a field frequency of 50 Hz and the number of scanning lines of 625 has a reduced screen size, but can reproduce colors equivalent to those of the NTSC system. Further, since the number of scanning lines and the field frequency are not converted, the apparatus can be made small, lightweight, and inexpensive. In particular, the drive mechanism (mechanism) and control system of the VTR unit are 1
By keeping the system as it is and having only the processing part of the video signal having the system conversion function, it is possible to reduce the cost.

In addition to the above, it is preferable to provide second conversion means for inverting and outputting the color signal converted by the conversion means around the BY axis every horizontal scanning period. According to this, it is possible to reproduce beautiful colors equivalent to those of the NTSC system at a low price without increasing the size of the apparatus.

[0010] As a result, for example, after shooting with a NTSC-dedicated camcorder, the output can be connected to a PAL system television and a beautiful colored image can be viewed. Can be realized simply. It is also possible to provide a very convenient NTSC camcorder that can be used both in Japan and overseas at a low price.

Of course, even in the case of a PAL type camcorder, a recording / reproducing apparatus with a reproducing method conversion function with low cost and ease of use can be realized by similar means.

Further, the video signal processing portion of the VTR section is constituted by digital signal processing means, and a modulation carrier generating means capable of simultaneously converting a reproduced color signal into a 4.43 NTSC or PAL signal when encoding the reproduced color signal into the NTSC system. By using an oscillator, it can be realized with one crystal oscillator, and the system conversion function can be realized with almost no increase in cost. Therefore, it is possible to provide a low cost camcorder that can freely record and reproduce abroad (within the PAL area) even though it is an NTSC camcorder.

In a camera-integrated recording / reproducing apparatus using a disk (hereinafter referred to as a disk movie),
By arranging an encoder capable of modulating both NTSC and PAL at the output side of the MPEG decoder, it is possible to compose a movie that can be used in either NTSC or PAL, just like the camcorder. The encoder can be basically realized by the same technology as the camcorder.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 show a first embodiment to which the present invention is applied. This embodiment is a camcorder of the NTSC system to which a function of converting a reproduction system of the PAL system is added. FIG. 1 shows a signal processing circuit of the camcorder according to the characteristic portion, and FIG. 2 shows a concept of the embodiment. FIG.
As shown in (1), the camera unit and the VTR unit are integrated in the NTSC camcorder 71 with the PAL conversion function. The drive mechanism of the camcorder 71 and its control system are as follows:
There is no difference from the conventional NTSC camcorder dedicated to NTSC, with a field frequency of 60 Hz and the number of scanning lines is 5
There are 25. Then, using the NTSC magnetic tape 72, recording and reproduction according to the NTSC standard are performed, and a signal in a format conforming to the NTSC broadcasting system is output as an output signal. Therefore, normal reproduction is performed by connecting to the NTSC television 73, and when performing reproduction by connecting to the PAL television 74, switching to PAL conversion is performed.

The PAL conversion function of the present embodiment has the following two modes. In addition, only the following 4.41 NTSC mode (1) may be provided. (1) A mode for converting an NTSC color signal into a PAL color subcarrier frequency (4.43361875 MHz) (hereinafter 4.43)
(Referred to as NTSC mode) (2) The color signal of 4.43 NTSC color signal is converted by changing the burst phase so that the burst signal is at a position of 135 degrees and alternated every horizontal scanning period (1H). Is converted into a PAL signal state (hereinafter referred to as a PAL60 mode). Here, to alternate the color signal every one horizontal scanning period (1H) means that the RY component changes the BY axis every 1H. Invert to the center.

In order to keep the price at a minimum, the number of scanning lines is kept at 525 in the NTSC system, and the field frequency is kept at 60 Hz. Therefore, when projected on a television set having a field frequency of 50 Hz and a number of scanning lines of 625 in the PAL system, the screen appears to be in a contracted state, but a beautiful color equivalent to NTSC can be reproduced. If there is a camcorder that has such a conversion function of 4.43 NTSC or PAL60 on the playback side, people living in Japan or North America may stay in PAL countries such as Europe, Southeast Asia and the Middle East for a long time, When staying in the country, you will be able to watch videos shot with movies used in Japan on the local TV. Therefore, one camcorder
If you buy one, there is no problem no matter where you live, it is very economical to use for a camcorder and it is very convenient.

Next, means for specifically realizing the concept shown in FIG. 2 will be described with reference to FIG. FIG. 1 shows a signal processing circuit of the camcorder 71. Here, particularly, a configuration in a case where the signal processing is performed by a digital signal processing method is shown.

First, the camera recording mode will be described. The video signal output from the image sensor 29 is digitized by the A / D converter 30 and processed by the camera signal processing circuit 31. Thereby, the luminance signal (Y) and the color signal processing (C) of the video signal are output from the camera signal processing circuit 31. The luminance signal (Y) is processed by the luminance signal processing circuit 32 and converted into an FM modulated wave,
The signal is converted into an analog signal by the A converter 15 and sent to the adder 28. On the other hand, the color signal (C) is input to the multipliers 10 and 11 via the switch circuit 6. The color signal output from the camera signal processing circuit 31, that is, the multipliers 10, 1
1 is a chrominance subcarrier (frequency fsc:
In the NTSC broadcasting standard, a signal modulated at 455 fh / 2, fh is a horizontal scanning frequency (hereinafter, referred to as a modulated color signal).
It is. Then, two frequency signals output from the fsc carrier generation circuit 23 and having different phases by 90 degrees are input to the multipliers 10 and 11 via the switch circuits 8 and 9.
Therefore, in the multipliers 10 and 11, the modulated chrominance signal and the fsc carrier signal are multiplied, and the chrominance signal (RY,
BY) are obtained. These two color difference signals are processed by the RY signal processing circuit 12 and the BY signal processing circuit 13, respectively, and then input to the burst phase conversion circuit 14.

The burst phase conversion circuit 14 is a function required when converting to the PAL system and reproducing the data.
At the time of recording, the color difference signal passes through the burst phase conversion circuit 14 through. Next, in the multipliers 16 and 17, the low-frequency color subcarrier frequency (hereinafter, this frequency is referred to as flsc).
Converted to a band. That is, the flsc carrier generation circuit 7
The flsc carrier generated in is switched circuit 18,
The signal is input to multipliers 16 and 17 via 19 and is multiplied by the color difference signal output from the burst phase conversion circuit 14 to perform low-frequency conversion. The output signals of the multipliers 16 and 17 that have been subjected to low-frequency conversion are added by an adder 20 and converted into low-frequency converted color signals recorded on a magnetic tape. The output of the adder 20 is D / A after unnecessary components are removed by a low-pass filter 26.
The signal is converted into an analog signal by the converter 27 and sent to the adder 28. Then, in the adder 20, the D / A converter 1
5 and is sent to the magnetic heads 2 and 3 of the rotating drum 1 for recording on a magnetic tape.

Here, the switch circuits 6, 8, 9, 18,
Numerals 19 are switched to the "R" side at the time of recording and switched to the "P" side at the time of reproduction by a switching command (not shown). In addition, a reproduction / recording mode switching control signal is input from a terminal 35, and an NTSC / PAL conversion mode (hereinafter, NP
A conversion signal is input from the terminal 22 to the binary state (H / H) every horizontal scanning cycle (1H).
L) is input. Also, terminal 37
The oscillation frequency of the fsc carrier generation circuit 23 is
A command signal for selecting one of 3.579545 Mhz and 4.43361875 Mhz is input. From the terminal 38, a burst period “
A burst gate signal which becomes H "is input. These will be described in detail with reference to FIGS.

Next, the reproduction mode will be described. The video signal reproduced by the magnetic heads 2 and 3 on the rotating drum 1 is sufficiently amplified by a reproducing head preamplifier 4 and then
The digital signal is converted by the A / D converter 5. The luminance signal of the digitally converted video signal is reproduced and processed by a luminance signal processing circuit 32, converted to an analog signal by a D / A converter 36, and sent to an adder 33. The low-frequency conversion color signal is supplied to the multipliers 10 and 11 via the switch circuit 6.
Is multiplied by the flsc carrier signal input through the switch circuits 8 and 9 to be demodulated (decoded) into a color difference signal. The color difference signals output from the multipliers 10 and 11 are respectively supplied to the RY signal processing circuit 12.
Are processed by the BY signal processing circuit 13. The output signals of the RY signal processing circuit 12 and the BY signal processing circuit 13 are input to the burst phase conversion circuit 14, and when the control signal from the terminal 21 is "H", that is, when the PAL conversion command is issued, the burst signal is output. Is subjected to PAL conversion. If this control signal is "L", it is a command not to perform PAL conversion, so the burst phase conversion circuit 14 passes the input color difference signal as it is.

The output of the burst phase conversion circuit 14 is converted into an fsc band by the fsc carrier signal input through the switch circuits 18 and 19 in the multipliers 16 and 17 and then added by the adder 20 to be modulated. It is converted (encoded) into a color signal. Modulated color signal is BPF
After removing unnecessary components at 24, the signal is converted to an analog signal at a D / A converter 25 and added to a luminance signal at an adder 33, thereby obtaining a composite video signal at a terminal 3.
4 is output.

Next, the details of the fsc carrier generation circuit 23 in FIG. 1 will be described with reference to FIGS. FIG.
Shows a specific configuration of the fsc carrier generation circuit 23. Basically, the generation circuit of fsc is ROM (Read_On
ly_Memory). The ROM contains
For example, data for one cycle of a sine wave is stored.
In the figure, a ROM 56 is a carrier generator for the BY signal and a ROM 57 is a carrier generator for the RY signal. An integration circuit including an adder 54 and a flip-flop (FF) 55 is provided at a stage preceding the ROMs 56 and 57. This integration circuit sets the value input to the adder 54 as an initial value, and as a result, the output is fed back via the FF 55. As a result, the initial value is integrated and increased twice, three times, and so on. The sine wave is output from the ROMs 56 and 57 by using the integrated output as a read address of the ROMs 56 and 57. The initial value of the adder 54 is K1 or K2 set in the initial value setting units 51 and 52.
Is selected by the multiplexer 53 and supplied. The multiplexer 53 is connected to the terminal 3
7, one of K1 and K2 is selected. The switching signal input to the terminal 37 is, as described above, the fsc carrier generation circuit 23.
発 振 Mhz or 4.43 MMhz is selected as the oscillation frequency. In the mode of 4.43 NTSC / PAL60, an “H” signal for selecting 4.43 MMhz is input and the NTSC system is used. If it remains, "L" is input.

Next, a method for reading the ROMs 56 and 57 will be described with reference to FIG. In an NTSC camcorder, for example, the input address of the ROM is 10 bits, the phase of the sine wave of fsc is divided into 1024, and the amplitude value data of the sine wave corresponding to each phase divided into areas from address 0 to 1023. Is stored. Then, the initial value set in the integrator, that is, the initial input of the adder 54 is 25
6, the ROM addresses are X1 = 0, X2 = 256, X3 = 512, and X4 =, as shown in FIG.
, 768,... And the data Y1, Y2, Y3, Y4,. If the sampling frequency at this time is 4 fsc (four times fsc), the initial value is 256 and four cycles of f
An sc signal will be generated.

When the reproduction is performed with the color subcarrier frequency of the NTSC system unchanged, the initial value setting unit 51 sets K1 =
256 may be set. FIG. 4B shows NTSC (3.
58Mhz) to 4.43NTSC or PAL60
This shows how to read from the ROM when converting to. In this case, K2 値 317 (25
6 × 4.43361875 ÷ 3.579545), the R
OM addresses are X1 = 0, X2 = 317, X3 = 63
, X4 = 951,..., And the data Y1, Y2, Y3, Y4,. Thus, oscillation at a frequency of 4.43361875 MHz is possible. Switching between the initial value setting units 51 and 52 is performed by the multiplexer 53 according to the switching signal input to the terminal 37 as described above.

By the way, in the color difference signal of the PAL system, the RY axis is inverted every horizontal scanning period. Therefore, NTSC
When converting from the PAL60 system to the PAL60 system, it is necessary to invert the polarity of the converted carrier signal with respect to the RY signal.
Therefore, in the example of FIG. 3, the output of the POM 57 for generating the RY carrier signal is branched and inverted through the coefficient unit 58 in which “−1” is set. The output and the output are alternately switched and output to the terminal 61. The switching of the multiplexer 59 is performed by the output signal of the AND gate 65. That is, a PAL conversion command that becomes “H” in the PAL conversion mode described with reference to FIG. 1 is input to one input terminal 21 of the AND gate 65, and H / L is input to the other input terminal 22 every 1H. In the PAL mode, a signal whose H / L changes every 1H is output from the AND gate 65, so that the output signal of the ROM 57 and the signal inverted by the coefficient unit 59 are alternately changed every 1H. Is output from the multiplexer 59. That is, the conversion carrier that alternates every 1H is output to the terminal 61. The above is the method of generating the conversion carrier when converting from NTSC to PAL60.
By changing the set values of K1 and K2 of 1, 52, P
It is also possible to convert from the AL mode to the NTSC mode.

Next, the operation of the burst phase conversion circuit 14 of FIG. 1 will be described with reference to FIGS. FIG.
It shows a vector waveform of a color signal, and shows a process of converting an NTSC signal into a PAL signal. FIG. 7A shows a color signal of the NTSC system, which includes a burst signal 91 and a color signal 92. In the figure, the horizontal axis is B-
The Y axis and the vertical axis indicate the RY axis. In contrast, generally P
The AL signal is, as shown in FIG.
The polarity of the R-Y axis of the color signals 4, 95 and the color signals 98, 99 is inverted every 1H. In particular, the burst signals 94 and 95 are inverted at positions of 135 degrees and 225 degrees, that is, every 1H with respect to the BY axis. Therefore, P
In the case of performing the AL conversion, as shown in FIG. 3B, the burst signal 91 shown in FIG. 3A is advanced by 45 degrees and converted into a 135-degree burst signal 93. When the burst signal 93 is generated, the color difference signals 96 (BY signals) and 97
(RY signals) are generated and realized by synthesizing them. Further, as shown in FIG. 3C, PAL conversion is enabled by alternating every 1H.

FIG. 6 shows a specific circuit of the burst phase conversion processing of FIG. 5 (b). The RY signal is input to the terminal 100, and the BY signal is input to the terminal 101. As shown in FIG. 5A, in the case of the NTSC signal, the burst signal 91 has a signal only on the BY axis (180 degrees). Therefore, the RY component 97 converts the burst signal 91 before conversion into the coefficient −
The BY component 96 multiplies the burst signal 91 before conversion by the coefficient K set in the coefficient unit 103 by K3 (= −√2 / 2).
It is generated by multiplying by 3 (= √2 / 2). Then, they are connected to the terminals 108 and 109 via the switch circuits 104 and 105.
Are output as an RY signal and a BY signal. The vector waveform of the signal thus obtained is shown in FIG.
It is as shown in (b). Switch circuits 104, 10
5 are switched by the AND gate 106, respectively. The AND gate 106 is connected to the terminals 21 and 3 shown in FIG.
Control signals are input from 5, 38. Therefore,
When the reproduction / recording switching signal at the terminal 21 is in the reproduction mode, the PAL conversion command at the terminal 35 is “H”, and when the burst gate signal at the terminal 38 is “H”, AND
“H” is output from the gate 106. As a result, the switch circuits 104 and 105 are switched to the burst “B” side. When the output of the AND gate 106 is "L", the switch circuits 104 and 105 are switched to the through "T" side.

Next, the alternation processing for each 1H will be described. The signal shown in FIG. 5B can be converted into a PAL signal as shown in FIG. 5C by inverting the RY axis component every 1H. In order to invert the RY axis component every 1H, as described above with reference to FIG. A converted carrier for the signal is output, and the signal after the burst phase conversion shown in FIG.
That is, it can be realized by multiplying the output of the burst phase conversion circuit 14.

As described above, according to the first embodiment, in the NTSC camcorder,
Since it has an unprecedented function of converting only the color signal of the reproduction signal into a 4.43 NTSC or PAL signal, the output of the camcorder is dedicated to NTSC.
Even if it is connected to an AL-type television, it is possible to provide a very economical and easy-to-use camcorder that can view beautiful colored images and can be used in Japan as well as overseas. Therefore, if you have a camcorder purchased in the country where you live mainly (the first broadcast area), you can take a picture taken overseas (second broadcast area) where you are staying on a long-term business trip or traveling. It is possible to use it anywhere regardless of where you can enjoy soft tapes taken abroad, even if you bring it domestically, even if you bring it domestically.

Further, according to the first embodiment, only the video signal processing portion of the VTR section is provided with the conversion function of the reproduction system while the mechanical system of the camcorder and its control system correspond to one system. Therefore, cost reduction can be realized.

Further, since the video signal processing portion is constituted by digital signal processing and the carrier generation circuit capable of simultaneously converting the reproduced color signal into the NTSC or 4.43 NTSC signal when encoding the NTSC signal is constituted by the digital oscillator. , The oscillator can be realized by one crystal oscillator,
It is possible to realize a camcorder with a reproduction method conversion function that can freely record and reproduce abroad (within the PAL area) even though it is an NTSC-compatible camcorder with almost no increase in cost.

In the first embodiment, an example has been described in which a PAL system playback system converter function is added to an NTSC system camcorder.
Even when the reproduction system converter function of the system is added, a low-cost and easy-to-use product can be realized using exactly the same technology.

Here, the characteristic part of the process of performing the NTSC conversion of the PAL color signal will be described with reference to FIGS. FIG. 7 is a vector waveform diagram showing the conversion process. As shown in FIG. 7A, the PAL color signal alternating every 1H is stopped, as shown in FIG. 7B, and the burst signal is delayed by 45 degrees as shown in FIG. The burst signal 138 is converted to the position of.

FIG. 8 shows a specific example of the burst phase conversion circuit 14 in the conversion process from the PAL mode to the NTSC mode. “0” is set in the coefficient unit 112, and K4 is set in the coefficient unit 113. Then, by switching the switch circuits 114 and 115, it is selected whether to output the PAL color signal as it is to the terminals 118 and 119 or to perform NTSC conversion and output. This switch circuit 114,
Switching of 115 is performed by an AND gate 116. That is, as in the case of FIG. 6, the control signal is input to the AND gate 116 from the terminals 121, 122, and 123, and the reproduction / recording switching signal of the terminal 121 is in the reproduction mode, and When the NTSC conversion command is “H” and the burst gate signal at the terminal 123 is “H”, “H” is output from the AND gate 116.

With this configuration, when the switch circuits 114 and 115 are switched to the burst “B” side, the RY signal input from the terminal 110 is replaced by the switch circuit 114 with a constant zero. , Terminal 111
The BY signal input from is multiplied by K4 (= √2) set in the coefficient unit 113 by the switch circuit 115 and output from the terminals 118 and 119, respectively. As a result, the input color signal of the PAL system is converted to the NT signal shown in FIG.
It is converted into an SC color signal.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. FIG. 9 shows the concept of the present embodiment, which is a product concept in which a PAL playback conversion function is added to a camcorder with an NTSC liquid crystal display. In the figure, reference numeral 71 denotes a magnetic tape, reference numeral 86 denotes a camcorder, and reference numeral 87 denotes a magnetic tape.
Is a camera part, reference numeral 88 is a liquid crystal display, reference numeral 73
And 74 indicate a television. Recently, the ratio of camcorders with a liquid crystal monitor has been increasing from the viewpoint of ease of use. In addition to outputting to the televisions 73 and 74, a video signal and a reproduction signal from the camera are output to a liquid crystal display incorporated in the main body.

In such a camcorder with a liquid crystal monitor,
In the case where the same reproduction system conversion function as that of the embodiment shown in FIG. 1 is provided, consideration must be given to the liquid crystal display 88. That is, the liquid crystal display 88 is made of NTSC / P / C from the viewpoints of miniaturization, cost reduction, and power saving of the camcorder.
It is difficult to correspond to both signal forms of AL. In general, in the case of the NTSC model, the liquid crystal monitor corresponds to only the NTSC signal. Therefore, when a color signal is converted from the NTSC system to the 4.43 NTSC system or the PAL60 system, not only does the conversion circuit become complicated, but it is difficult to synchronize the signals, and the color is disturbed. In order to avoid this, in the present embodiment, the color signal output to the liquid crystal display 88 is easily dealt with by muting at the time of conversion of the reproduction method.

FIG. 10 shows a signal processing portion of the camcorder with a liquid crystal display according to the present embodiment. Basically, the same components as those in the embodiment of FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. In the figure, D
The luminance signal from the A / A converter 36 and the color signal via the D / A converter 25 and the mute circuit 120 are added to an adder 121.
And an output terminal 122 dedicated to the liquid crystal display.
Is output to During normal reproduction, the mute circuit 120
Does not operate, and a video signal with a color signal is output to the terminal 122. In contrast, 4.43 NTSC or PA
In the case of the reproduction in the L60 system, the output of only the color signal is stopped by the mute circuit 120, the signal output to the terminal 122 is only the luminance signal, and a black and white image is projected on the liquid crystal display.

As described above, 4.43 NTSC and PAL6
The 0 reproduction is a function for displaying an image on a local television, and is a process for a liquid crystal display that needs to avoid malfunction such as color fluttering. The control of the mute circuit 120 is controlled by 4.43N input from the terminal 21.
This is performed by a signal that becomes “H” at the time of TSC or PAL60.

(Third Embodiment) FIGS. 11 and 12 show a third embodiment of the present invention. FIG. 11 shows the concept of the present embodiment, in which an NTSC / PAL playback conversion function is added to an NTSC disc movie 83. In the figure, reference numeral 81 denotes a disk, reference numeral 83 denotes a disk movie, reference numeral 7
Numerals 3 and 74 each indicate a television. At present, even in the case of a disk movie using a recording medium as a recording medium which is being considered for commercialization, a function of converting a reproduction output into a plurality of broadcasting systems (NTSC, PAL, etc.) is provided similarly to the camcorder shown in FIG. For example, in an NTSC-type disc movie, it is possible to display an image on a PAL-type television in addition to the NTSC. Therefore, for example, if you buy one disc movie that has the conversion function of 4.43 NTSC or PAL60 on the playback side, you can live without any trouble in any country, you can use it very economically for disc movie, Because of its height, it is more convenient than a camcorder.

FIG. 12 is a functional block diagram of an example that embodies the concept of FIG.
(Digital Video Disc) standard RAM (Random Access Me
(Mory), which shows a specific example of a system configuration of a disk movie using a recording medium capable of recording and reproduction. Here, the disc movie based on the NTSC system is P
The description will be made assuming that the reproduction system converter function of the AL system is added.

In the figure, at the time of recording, an analog video signal output from the image pickup device 162 is converted to an A / D converter 16.
3 and converted into a digital signal.
4, demodulated to baseband by the NTSC decoder 155, and MPEG (Moving Picture Experts Gr.
oup) After being compressed by the encoder 153, the DVD recording signal processing 152, the recording amplifier 151, the switch circuit 16
9 and is transmitted to the pickup 150 and recorded on the disk.

At the time of reproduction, the video signal reproduced by the pickup 150 is sufficiently amplified by the preamplifier 161 via the switch circuit 169, and then the DVD reproduction signal processing 16
2, the MPEG decoder 159 decompresses and converts it into a baseband signal. This baseband signal is demodulated into an NTSC signal by an NTSC encoder 158, converted to an analog signal by a D / A converter 168, and output to an output terminal 156. Here, the carrier generation circuit 154 generates and outputs a converted carrier to the NTSC encoder 155, and is similar to the fsc carrier generation circuit 23 described with reference to FIGS. The signals input to the terminals 165, 166 and 167 are the 4.43 NTSC conversion control signal and the PAL signal, respectively.
60 conversion control signal and alternation control signal.

As described above, even in a disc movie, NTSC, 4.43 NTSC and P
By providing a reproduction method conversion circuit compatible with AL60, a disc movie that can be used anywhere in the world can be realized with one set, like a camcorder.

As a recording medium used for a disc movie, not only a DVD-RAM but also a recording medium such as an MO or a hard disk can be similarly realized, and is within the scope of the present invention. Also, in the description of the present embodiment, the description has been given with respect to the camcorder and the disc movie of the NTSC system. it is obvious.

[0047]

As described above, according to the present invention,
A low-cost and easy-to-use reproduction signal processing device with a reproduction system conversion function, and a recording / reproducing device and a camera-integrated recording / reproducing device having the same can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a signal processing system of a camcorder with a reproduction format conversion function according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the concept of the camcorder according to the embodiment shown in FIG. 1;

FIG. 3 is a diagram illustrating an example of an fsc carrier generation circuit according to the embodiment of FIG. 1;

FIG. 4 is a schematic diagram illustrating an operation of the fsc carrier generation circuit of FIG. 3;

FIG. 5 is a vector waveform diagram showing a process of converting an NTSC color signal into a PAL color signal.

FIG. 6 is a diagram illustrating an example of a burst phase conversion circuit according to the embodiment of FIG. 1;

FIG. 7 is a vector waveform diagram showing a process of converting a PAL color signal into an NTSC color signal.

8 is a diagram illustrating an example of a burst phase conversion circuit that converts a PAL color signal into an NTSC color signal in FIG. 7;

FIG. 9 is a diagram for explaining the concept of a playback system conversion function in a camcorder with a liquid crystal display according to a second embodiment of the present invention.

FIG. 10 is a configuration diagram of a signal processing system of the camcorder according to the embodiment of FIG. 9;

FIG. 11 is a diagram illustrating the concept of a disc movie with a playback format conversion function according to a third embodiment of the present invention.

12 is a configuration diagram of a signal processing system for a disc movie according to the embodiment of FIG. 11;

[Explanation of symbols]

72,86 camcorder with conversion function, 14 burst phase conversion circuit, 23,154 fsc carrier generation circuit, 29,162 image sensor, 31,164 camera signal processing circuit, 56,57 ROM, 102,103,113 coefficient unit, 88 liquid crystal display, 120 mute circuit, 83 disk movie, 152 DVD recording signal processing circuit, 160 DVD reproduction signal processing circuit, 153 MPEG encoder, 159 MPEG decoder, 155 NTSC / 4.43 NTSC / PAL60 encoder, 158 NTSC decoder.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Nishijima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the multimedia system development headquarters of Hitachi, Ltd. 292 Hitachi Image Information System Co., Ltd. (72) Inventor Eiji Moro 1410 Inada, Hitachinaka-shi, Ibaraki Pref. Video Information Media Division, Hitachi, Ltd. (72) Inventor Hideo Kaniya, Totsuka-ku, Yokohama, Kanagawa 292 Yoshida-cho Hitachi, Ltd. Video Information Media Division

Claims (16)

[Claims] 1. A helical scan type NTSC recording / reproducing apparatus for recording a FM-modulated luminance signal and a low-frequency converted color signal on a magnetic tape or reproducing from a magnetic tape using a magnetic head mounted on a rotating drum. In, NT
When reproducing a magnetic tape on which an SC video signal is recorded,
A recording / reproducing apparatus with a reproducing method conversion function, comprising a first conversion means for converting a color signal into a color subcarrier frequency of a PAL system and outputting the converted signal. 2. The color signal converted by the first conversion means,
A recording / reproducing apparatus with a reproducing method conversion function, comprising a second conversion means for inverting and outputting about the BY axis every horizontal scanning cycle. 3. A camera unit having an image sensor, and a recording / reproducing unit for recording a video signal imaged by the camera unit on a magnetic tape or reproducing from a magnetic tape, wherein the recording / reproducing unit is A helical scan type NTSC system that generates an FM-modulated luminance signal and a low-frequency-converted color signal from a video signal and records the data on a magnetic tape or reproduces data from the magnetic tape using a magnetic head mounted on a rotating drum. In a camera-integrated recording / reproducing apparatus, when reproducing a magnetic tape on which an NTSC video signal is recorded, color signals are converted to PAL signals.
1. A camera-integrated recording / reproducing apparatus with a reproducing method conversion function, comprising a first conversion means for converting a color subcarrier frequency into a color subcarrier frequency for output. 4. A color signal converted by the first conversion means,
A recording / reproducing apparatus with a built-in camera having a reproducing method conversion function, comprising a second conversion means for inverting and outputting about the BY axis every horizontal scanning cycle. 5. A liquid crystal display for displaying a video signal reproduced on the recording / reproducing section, and a mute means for stopping output of a color signal output from the first or second conversion means to the liquid crystal display. The camera-integrated recording / reproducing apparatus with a reproducing method conversion function according to claim 4 or 5, wherein the recording / reproducing apparatus with a reproducing method conversion function is provided. 6. A helical scan type PAL recording / reproducing apparatus for recording a FM-modulated luminance signal and a low-frequency converted color signal on a magnetic tape or reproducing from a magnetic tape using a magnetic head mounted on a rotating drum. In, PAL
Recording / reproducing apparatus having a reproducing system conversion function, comprising: a first conversion unit for converting a color signal into a color subcarrier frequency of an NTSC system and outputting the color signal when reproducing a magnetic tape on which a video signal of a system is recorded. . 7. A third conversion means for stopping the alternation (inverting a color signal for inverting around the B-Y axis) for each horizontal scanning cycle output from the first conversion means and outputting the third conversion means. A recording / reproducing apparatus having a reproducing method conversion function. 8. A camera unit having an image sensor, and a recording / reproducing unit for recording a video signal imaged by the camera unit on a magnetic tape or reproducing from a magnetic tape, wherein the recording / reproducing unit is A helical scan type PAL system that generates a FM-modulated luminance signal and a low-frequency converted color signal from a video signal and records the data on a magnetic tape or reproduces data from the magnetic tape using a magnetic head mounted on a rotating drum. In a camera-integrated recording / reproducing apparatus, first reproducing means for converting a color signal into a color subcarrier frequency of an NTSC system and outputting the color signal when reproducing a magnetic tape on which a PAL video signal is recorded is provided. A camera-integrated recording / playback device with a playback format conversion function. 9. The color signal converted by the first conversion means,
A camera-integrated recording / reproducing apparatus with a reproducing method conversion function, comprising a third conversion means for stopping and outputting an inversion operation of a color signal which is inverted about the B-Y axis every horizontal scanning cycle. 10. A mute means having a liquid crystal display for displaying a video signal reproduced by said recording / reproducing unit, and stopping output of a color signal output from said first or third conversion means to said liquid crystal display. The recording / reproducing apparatus with a built-in camera having a reproducing method conversion function according to claim 8, wherein the recording / reproducing apparatus is provided. 11. An A / D converter for converting a video signal reproduced from a magnetic tape into a digital signal,
A low-band carrier generating means for generating two low-band chrominance sub-carriers different from each other by 0 °, and a low-band chrominance sub-carrier output from the low-band carrier generating means into a reproduced chrominance signal output from the A / D conversion means A decoder for generating two chrominance signals by multiplication, a modulation carrier generating means for generating two chrominance subcarriers having phases differing by 90 °, and outputting two chrominance subcarriers output from the modulation carrier generation means from the decoder Encoder for generating a modulated color signal by multiplying each of the two color difference signals to be obtained, adding means for adding the two modulated color signals output from the encoder, and converting the output of the adding means to an analog signal to display In a reproduction signal processing device having a D / A conversion means for outputting to a connection terminal, the modulation carrier generation means comprises an NTSC system and a PA
A reproduction signal processing apparatus for generating two types of color subcarrier frequencies of the L system and outputting one of the color subcarrier frequencies to the encoder in accordance with an externally applied command. 12. A burst phase of an equation difference signal input to the encoder is set to N by an externally applied command.
12. The reproduction signal processing apparatus according to claim 11, further comprising a burst phase conversion unit for changing the transmission direction between the TSC system and the PAL system. 13. The ROM according to claim 13, wherein said modulated carrier generating means stores sine wave amplitude data using an address as a phase.
And an integrating means for integrating the preset initial value in accordance with a clock signal to generate the address, wherein two initial values are set in correspondence with the NTSC system and the PAL system. 2. The method according to claim 1, wherein the initial value is switched and used according to a command given from outside.
13. The reproduction signal processing device according to 1 or 12. 14. The burst phase conversion means according to claim 11, wherein
When converting and reproducing the C-system video signal to the PAL system, the chrominance signal RY signal and the BY signal in the burst period are each multiplied by -√2 / 2 (= -0.707) times the BY signal. And √2 / 2 (= 0.7
07) Replace with doubled signal and convert PAL video signal to NTS
In the case of reproducing by converting into the C system, the chrominance signal RY signal and the BY signal in the burst period are replaced with a signal of 零 2 (= 1.411) times the zero signal and the BY signal, respectively. The reproduction signal processing device according to claim 12 or 13, wherein 15. A camera unit having an image sensor, a drive mechanism for rotating a disk, means for compressing and expanding signals from the camera, an encoder for modulating a signal expanded during reproduction into a PAL signal, and a pickup. And a signal processing means for recording and reproducing data on and from a disk through a PAL system, wherein the encoder converts a color signal reproduced from a disk on which a PAL signal is recorded into a color subcarrier frequency of an NTSC system. (3.579545 Mhz), a reproduction system comprising: a first conversion unit for converting the color signal converted by the first conversion unit; and a second conversion unit for stopping alternation of the color signal converted by the first conversion unit every horizontal scanning period. Recording / playback device with conversion function. 16. A camera unit having an image sensor, a drive mechanism for rotating a disk, means for compressing and expanding signals from the camera, an encoder for modulating a signal expanded during reproduction into a PAL signal, and a pickup. A PAL-type disc-type recording / reproducing apparatus having a signal processing means for recording / reproducing on / from a disc via a liquid crystal display, and wherein the encoder reproduces a color signal reproduced from the disc on which a PAL-type video signal is recorded. A first conversion means for converting the color subcarrier frequency (3.579545 Mhz) of the NTSC system, and a third conversion mode for stopping the alternation of the color signal converted by the first conversion means every horizontal scanning cycle. A recording / reproducing apparatus with a reproducing method conversion function, comprising: