JPS633595A - Color video signal reproducing device - Google Patents

Abstract

PURPOSE:To prevent the degradation in picture quality at the time of dubbing by dubbing component signals without passing color encoders as they are and using an ID signal, which is used for reverse line sequentializing processing in master side, for line sequentializing processing in slave side. CONSTITUTION:The DC level of the pedestal of a line sequential color signal is detected by an ID detecting circuit 19 of an electronic still camera 1 in the master side to generate an ID signal S9 which discriminates the horizontal period where an R-.Y signal or a B Y signal exists, and this signal S9 is supplied to not only a reverse line sequentializing circuit 16 but also a dubbing input terminal 9b of a still cameka 2 in the slave side from a dubbing output terminal 9a. A luminance sig nal S4 generated by an FM demodulating circuit 12, an R-Y signal S7, and a B-Y signal S8 are supplied to a matrix circuit 13 and are subjected to marix processing to supply component signals of R, G, and B three-primary color signals and the horizontal synchronizing signal, which is separated from a luminance signal, to dubbing output terminals 4a-7a.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is a method for line-sequentializing an FM-modulated luminance signal recorded on the same trunk of a magnetic disk, etc., and performing FM modulation at a carrier frequency different from that of the luminance signal. The present invention relates to a color video signal reproducing device that reproduces a color difference signal obtained by using a color video signal.

[4 Summary of the Invention] This invention provides an FM-modulated luminance signal recorded on the same track such as a magnetic disk, and a line-sequentialized color difference signal that is FM-modulated at a carrier frequency different from that of the luminance signal. A color video signal reproducing device that reproduces R, G, and B primary color signals or a luminance signal, a red color difference signal ((RY) signal), and a blue color difference signal ((B -Y) signal] as is, and also detects the DC level of the pedestal of the line-sequential color signal and outputs it as an ID signal that identifies the horizontal period, thereby preventing deterioration of image quality during dubbing. It is designed to prevent this.

[Conventional technology]

In conventional electronic still cameras, for example, CCD
R and G obtained by solid-state imaging devices such as

The B three primary color signals are supplied to the matrix circuit, and the luminance signal and (
The luminance signal is FM-modulated at a predetermined carrier frequency by forming a (R-Y) signal and a (B-Y) signal.
The Y) signal and the (B-Y) signal are line-sequentialized, the line-sequentialized color signal is FM-modulated at a carrier frequency different from that of the luminance signal, and the line-sequential color signal is FM-modulated at a carrier frequency different from that of the luminance signal, and the signal is placed on the same concentric trunk of a recording medium such as a magnetic disk, for example. Color video signals are recorded for each field. In this case, the (RY) signal and (B-Y
) signals are FM modulated with different carrier frequencies.

When reproducing a color video signal recorded in this way, a reproduced RF signal reproduced from a recording medium by a magnetic head is supplied to a no-pass filter and a low-pass filter, and the reproduced F signal is output as an output of a bypass filter.
An M-modulation modulation variation signal is obtained, and an FM modulation line sequential color signal reproduced as an output of a low-pass filter is obtained. FM
The modulated luminance signal is demodulated by the FM demodulation circuit, and the luminance signal is supplied to the color encoder, and the FM modulated line-sequential color signal is demodulated by the FM demodulation circuit, and the line-sequentialed color signal is supplied to the reverse line-sequentialization circuit. .

In the reverse line sequentialization circuit, the (R-Y) signals present in the 2n horizontal periods and (2n+2) horizontal periods of the line sequential color signal are added together to make 2, so that the (R-Y) signals that are missing in the (2n+1) horizontal periods are Y) signal in the (2n + 2) horizontal period by adding the (B-Y) signals existing in the (2n + 1) horizontal period and (2n + 3) horizontal period to 2. Missing (B-Y
) signal, a line-sequential color signal delayed by one horizontal period, a (R-Y)′ signal and (
By selectively outputting the B-Y)' signal at the timing of the horizontal synchronization signal, the (R-Y) signal and the (B-Y) signal are obtained. After controlling the level so that the (RY) signal and the (B -Y) signal are at the same DC level,
A (RY) signal and a (B-Y) signal are supplied to the color encoder.

In the color encoder, (RY) (No. 8 and (B-Y
) signal is subjected to orthogonal two-phase modulation and superimposed on the luminance signal to form a composite NTSC color video signal, which is supplied to the output terminal and transmitted to a monitor connected to the output terminal.

In addition, when dubbing the composite NTSC color video signal obtained from the output terminal of the conventional electronic still camera described above to another electronic still camera, the color of the electronic still camera on the mask side as described above is In the encoder, (RY) signal and (B-
Y) signal is orthogonally two-phase modulated and superimposed on the luminance signal,
The signal is transmitted as a TSC color video signal to the input terminal of the slave electronic still camera via the output terminal. The decoder of the electronic still camera on the slave side demodulates the composite color video signal, separates it into a luminance signal, a (RY) signal and a (B-Y) signal, and then
FM by converting (B-Y) signal and (R-Y) signal into line sequential
At the same time, the luminance signal is FM-modulated and recorded.

[Problem that the invention seeks to solve]

However, when dubbing as described above, color encoding processing is performed on the master side and decoding processing is performed on the slave side, so there is a drawback that the image quality deteriorates due to these unnecessary processes, and the slave side Depending on the timing of line sequentialization in , the (RY)' signal and (B-Y)' signal formed by averaging the (RY) signal and (B-Y) signal during one horizontal period before and after.
In some cases, only signals are extracted and recorded during line sequentialization, which may significantly deteriorate image quality.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a color video signal reproducing device that can prevent deterioration of image quality during dubbing.

[Means for solving problems]

The present invention provides a color video signal to which a reproduced signal consisting of an FM-modulated luminance signal and a line-sequential signal of an FM-modulated first color difference signal and second color difference signal having mutually different carrier frequencies is supplied. In the playback device, FM
an FM demodulation circuit 12 that performs FM demodulation on a modulated luminance signal and generates a luminance signal; and an FM demodulation circuit 12 that performs FM demodulation on the FM modulated first color difference signal and second color difference signal and generates a line sequential color signal. a demodulation circuit 15; and an ID signal forming circuit 19 for identifying the horizontal period corresponding to the first color difference signal and the second color difference signal, respectively, by detecting a change in the DC level of the line 1 sequential color signal. , a synchronization circuit 16 that synchronizes the line-sequential color signals using the ID signal, and an output terminal 4a for dubbing from which the luminance signal and the synchronized color difference signal or the three primary color signals and the ID signal are derived. ~7a, 9a
1. A color video signal reproducing device characterized by comprising:

[Effect]

In the ID detection circuit 19, the DC level of the pedestal of the line-sequential color signal is output +i, and an ID ( i number S9 is formed, and this ID signal S9 is supplied to the reverse line sequentialization circuit 16 and also supplied to the output terminal 9a for dubbing.
The luminance signal S formed in the FM demodulation circuit 12 is
4 is supplied, and at the same time, I
A (RY) signal S7 and a (B-Y) signal S8 formed by synchronization based on the D signal S9 are supplied. In the matrix circuit 13, the luminance signal S4. The reproduced (RY) signal S7 and the (B-Y) signal S8 are matrix-processed to form component signals of RlG and B primary color signals, and R and G are output to the output terminals 4a to 6a for dubbing, respectively.

Each of the three primary color signals B is supplied, and at the same time, a horizontal synchronized signal separated from the luminance signal S4 in the matrix circuit 13 is supplied to the output terminal 7a for dubbing.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.This invention is applied to a reproduction system of an electronic still camera, etc. Fig. 1 shows an embodiment of the present invention. In Fig. 1, the electronic still camera designated by 1 is the master side, and the electronic still camera designated by 2 is the slave side.The electronic still cameras 1 and 2 are, for example, Although not shown, the device includes a recording medium such as a magnetic disk, and color video signals are recorded on the same track of the magnetic disk.

For example, R, G obtained by a solid-state image sensor such as a CCD
, B primary color signals are supplied to a matrix circuit, and are converted into component signals of a luminance signal, a (RY) signal, and a (B-Y) signal. As shown in FIG. 5, the luminance signal is FM-modulated so as to have a predetermined frequency range (6°0 to 7.5M1(z). Also, the (RY) signal and (B-
Y) The signal is line-sequentialized. For example, the (RY) signal existing in the 2nn hydrosphere period is extracted, and (2n+1
) The (B-Y) signals present in the horizontal period are extracted, and these (R-Y) and (B-Y) signals are made into line-sequential color signals. This line-sequential color signal is FM-modulated in a frequency range different from that of the luminance signal, as shown in FIG. In this case, the center frequency of the (RY) signal section is 1.2M
Hz, and the center frequency of the (B-Y) signal section is 1.3M)Iz.

An FM-modulated luminance signal and an FM-modulated line-sequential color signal are recorded on the same concentric track of a magnetic disk, for example, one field at a time.

A color video signal recorded on a magnetic disk is reproduced by a magnetic head, and a reproduced RF signal is supplied to an input terminal indicated by 3 in FIG. A reproduced RF signal is supplied to a bypass filter 11 and a low-pass filter 14 via an input terminal 3.

In the bypass filter 11, the reproduced FM modulated luminance signal S2 is separated, and the low-pass filter 14
At , the reproduced FM modulation line sequential color signal S3 is separated.

The FM modulated brightness signal S2 obtained as the output of the bypass filter 11 is supplied to the FM demodulation circuit 12, where it is FM demodulated to become a brightness signal S4, and this brightness signal S4 is sent to the multi-IJ circuit. 13 and also to the synchronization separation circuit 18. In the synchronization separation circuit 18, the horizontal synchronization signal in the luminance signal S4 is separated, and the timing signal S6 is generated based on the horizontal synchronization signal.
is formed. This timing signal S6 is supplied to the ID detection circuit 19.

In addition, the FM obtained as the output of the low-pass filter 14
The modulated line sequential color signal S3 is supplied to the FM demodulation circuit 15, where it is FM demodulated to become a line sequential color signal S5, and this line sequential color signal S5 is sent to the reverse line sequentialization circuit 16. At the same time, it is also supplied to the ID detection circuit 19.

In the ID detection circuit 19, the line sequential color signal S5 from the FM demodulation circuit 15 is sampled and held using the timing signal S6 from the synchronization separation circuit 18, and the DC level of the pedestal of the line sequential color signal is detected. D of this pedestal
The C level detection output identifies the horizontal period in which the (R-Y) signal exists and the horizontal period in which the (B-Y) signal exists.
The D signal S9 is used as the ID signal S9, and the ID signal S9 is sent to the reverse line sequentialization circuit 16.
It is also supplied to the output terminal 9a for dubbing.

The reverse line sequentialization circuit 16 is constituted by a synchronization circuit, a level shift circuit, etc., and synchronizes the line sequential color signals based on the ID signal S9 to generate (RY) signals S7 and (R-Y) signals S7 and (R-Y).
B-Y) forms the signal S8. For example, FIG. 2 shows a specific configuration of the synchronization circuit in the reverse line sequentialization circuit 16.

A line sequential color signal S5 as shown in FIG. 3A, for example, is supplied from the FM demodulation circuit 15 to a terminal indicated by 41 in FIG. At this time, the synchronization separation circuit 18 separates the horizontal synchronization signal from the luminance signal S4 to form the timing shown in the third circle F (No. 3 S6). The timing signal S6 is supplied to the ID detection circuit 19, and the timing In the section where the signal S6 is at a high level, the sequential color signal S5 is sampled and held as shown in the line shown in FIG. S9 is formed. The ID signal S9 shown in this third circle F is supplied to the terminal shown at 42 in FIG.

The line sequential color signal S5 (shown in FIG. 3A) is supplied to the adder circuit 45 via the terminal 41, and the IH delay circuit 4
3. The line sequential color signal S5 (shown in the third circle F) delayed by one horizontal period in the IH delay circuit 43 is supplied to the other input terminal 47b of the switch circuit 47 and one input terminal 48a of the switch circuit 48. With,
The signal is supplied to the IH delay circuit 44. The line sequential color signal S5 further delayed by one horizontal period in the IH delay circuit 44 is supplied to the adder circuit 45.

In the adder circuit 45, the current line sequential color signal and the line sequential color signal two horizontal periods ago are added, and the addition output of the adder circuit 45 is supplied to the averaging circuit 46. In the averaging circuit 46, the addition output from the adding circuit 45 is averaged as 1/, for example, and the output of the averaging circuit 46 is supplied to one input terminal 47a of the switch circuit 47, and is supplied to the other input terminal 48b of.

The switch circuit 47 and the switch circuit 48 are controlled by an ID signal S9 (shown in the third circle F) supplied via the terminal 42. For example, when the ID signal S9 is set to high level, one input terminal 47 of the switch circuit 47
The output of the averaging circuit 46 supplied to
The output of the IH delay circuit 43 supplied to a is selected and output. Further, when the ID signal S9 is set to a low level, the output of the IH delay circuit 43 supplied to the other input terminal 47b of the switch circuit 47 is selected and output, and the other input terminal of the switch circuit 48 is selected and output. The output of the averaging circuit 46 supplied to the terminal 48b is selected and output.

Therefore, the (B-Y) signal is output from the terminal 49 derived from the output terminal of the switch circuit 47, and the (B-Y) signal is output in (2n+1) horizontal periods as shown in the third diagram. and (2n+1) horizontal periods and (2
n+3) Pseudo (B-Y) formed by adding CB-Y) signals present in the horizontal period to 2
' signal is output. Further, the (RY) signal is output from the terminal 50 derived from the output terminal of the switch circuit 48, and as shown in FIG. 3C, (
The (RY) signal is output and the (RY) signal is present in the 2n horizontal period and (2n+2) horizontal period in the (2n'-, 1) horizontal period in which the (RY) signal is missing. The pseudo (
RY)' signal is output.

The (B-Y) signal and the (R-Y) signal are level-shifted so that the pedestal DC level of the (B-Y) signal obtained at the terminal 49 and the (R-Y) signal obtained at the terminal 50 match. Ru. As one output of the reverse line sequentialization circuit 16 (R
-Y) The signal S7 is supplied to the matrix circuit 13 and also to the color encoder 17. Further, as the other output of the reverse line sequentialization circuit 16, the (B-Y) signal S8 is supplied to the matrix circuit 13 and also to the color encoder 17.

After separating the horizontal synchronization signal from the luminance signal S4 in the matrix circuit 13, the luminance signal S4. (RY) signal S7 and (B-Y) signal S8 are matrix-processed, and R
, G, and B are component signals of the three primary color signals. The R color signal from the matrix circuit 13 is supplied to the output terminal 4a for dubbing, and the G color signal is supplied to the output terminal 5 for dubbing.
a, and the B color signal is supplied to an output terminal 6a for dubbing. Further, the horizontal line 1 signal separated in the matrix circuit 13 is supplied to the output terminal 8.

Further, in the color encoder 17, the (RY) signal S7 and the (B-Y) signal S8 are subjected to orthogonal two-phase modulation and superimposed on the luminance signal S4.
The component signals of the signal S7 and the (B-Y) signal S8 are made into a composite signal of the NTSC system, and are supplied to the output terminal 8. For example, a monitor is connected to the output terminal 8, and a composite color dawn image signal is transmitted to the monitor via the output terminal 8.

During dubbing, the dubbing output terminals 4a to 7a, 9a of the electronic still camera l, which is the master side,
Dubbing input terminals 4b to 7b and 9b of the electronic still camera 2 on the slave side are connected. The R color signal from the output terminal 4a on the master side is supplied to the matrix circuit 21 via the input terminal 4b on the slave side, and the G color signal from the output terminal 5a on the master side is supplied to the matrix circuit 21 via the input terminal 5b on the slave side. The B color signal from the output terminal 6a on the master side is supplied to the matrix circuit 21 via the input terminal 6b on the slave side. Further, the horizontal synchronization signal from the output terminal 7a on the master side is supplied to the matrix circuit 21 via the input terminal 7b on the slave side, and the ID signal S from the output terminal 9a on the master side is supplied to the matrix circuit 21 via the input terminal 7b on the slave side.
9 is connected to the line sequential circuit 2 via the input terminal 9b on the slave side.
5.

In the matrix circuit 21, the R, G, and B three primary color signals are subjected to matrix processing, and the luminance signal S4° (R-Y) signal S
7 and (BY) signal S8. A horizontal synchronizing signal is added to the brightness signal S4, and the brightness signal S4 is supplied to the FM modulation circuit 23 and the color encoder 22. Also, (RY) signal S7
and (B-Y) signal S8 are supplied to the color encoder 22 and also to the line sequentialization circuit 25.

In the FM modulation circuit 23, the luminance signal S4 is FM-modulated within a predetermined frequency range (6.0 to 7.5 MHz) to form an FM-modulated luminance signal S2. The FM modulated luminance signal S2 formed in the FM modulation circuit 23 is supplied to the addition circuit 27.

In the color encoder 22, (RY) (No. 8 S7
and (B-Y) signal S8 are subjected to orthogonal two-phase modulation and superimposed on the luminance signal S4 to form a composite color video signal. The output of color encoder 22 is taken out from output terminal 28.

Also, in the line sequential circuit 25, the (RY) signal S7
and (B-Y) signal S8 is the ID detection circuit 1 on the master side.
The color signals 85 are line-sequentialized based on the ID signal S9 formed at step 9, and a line-sequentialized color signal 85 is provided. In other words, Figure 3G
As shown in , the (RY)' signal that is pseudo-formed by the (RY) signals of one horizontal period before and after is not extracted, and the (B-Y) signal of one horizontal period before and after is not extracted. ) signal is not extracted, and the same signal as the line sequential color signal S5 on the master side is formed in the line sequential circuit 25 and output.

The line sequential color signal S formed in the line sequential circuit 25
5 is supplied to the FM modulation circuit 26. FM modulation circuit 26
In , the line sequential color signal S5 is FM modulated in a frequency range different from that of the luminance signal S4, and the center frequency of the section where the (RY) signal exists is set to 1.2 MHz, and (
The center frequency of the section where the B-Y) signal exists is 1.3 old 1z. F formed in the FM modulation circuit 26
The M modulation line sequential color signal S3 is supplied to the adder circuit 27.

In the adder circuit 27, the FM modulated luminance signal S2 and the FM modulated line sequential color signal S3 are added and mixed to produce an RF multiplied signal. The output of the adder circuit 27 is the output terminal 29
taken out from and turned into magnetism.

The data is supplied to a magnetic disk drive system, and is recorded one field at a time on concentric tracks of a magnetic disk, and dubbing is performed.

FIG. 4 shows another embodiment of the present invention, in which R, G
, B primary color signals are not configured to be output in the form of component signals, but the luminance signal, (RY) signal and (B-Y
) The component signal of the signal is output as it is, and the other parts are the same as the one embodiment,
The same reference numerals are given.

A brightness signal S4 formed in the FM demodulation circuit 12 is supplied to the output terminal 4a. Further, the (RY) signal S7 formed in the reverse line sequentialization circuit 16 is supplied to the output terminal 5a, and the (B-Y) signal S8 is supplied to the output terminal 63.
ζ is supplied. Note that the ID signal S9 formed in the ID detection circuit 19 is supplied to the output terminal 9a as in the first embodiment.

During dubbing, the dubbing input terminals 4a to 6a, 9a of the electronic still camera l, which is the master side, and the dubbing input terminals 4b to 6b, 9b of the electronic still camera 2, which is the slave side, are connected. The luminance signal S4 from the output terminal 4a on the master side is supplied to the FM modulation circuit 23 via the input terminal 4b on the slave side, and is also supplied to the color encoder 22. Further, the (RY) signal S7 from the output terminal 5a on the master side is supplied to the color encoder 22 via the input terminal 5b on the slave side, and is also supplied to the line sequentialization circuit 25. A (B-Y) signal S8 from the output terminal 6a on the master side is supplied to the color encoder 22 via the input terminal 6b on the slave side, and is also supplied to the line sequentialization circuit 25.

The signals supplied to each circuit are processed in the same manner as in one embodiment, and a (R-Y)' signal that is pseudo-formed by (R-Y) signals of one horizontal period before and after is extracted. In addition, the (B-Y)' signal that is pseudo-formed by the (B-Y) signals of one horizontal period before and after is not extracted.
A signal identical to the line-sequential color signal S5 on the master side is formed, and dubbing is performed.

Note that the present invention can also be applied to the case of reproducing a PAL color video signal.

〔Effect of the invention〕

In this invention, the DC level of the pedestal of the line-sequential color signal is detected in the ID detection circuit to identify the horizontal period in which the -(RY) signal exists and the horizontal period in which the (B-Y) signal exists. An ID signal is formed and is supplied to a reverse line serialization circuit and to an output terminal for dubbing.

Further, the matrix circuit is supplied with the luminance signal formed in the FM demodulation circuit, and is synchronized with the (RY) signal formed by being synchronized based on the ID signal in the reverse line sequentialization circuit. (B-Y) signal is supplied. In the matrix circuit, the luminance signal, (RY
) signal and (B-Y) signal are matrix-processed and R,
These are component signals of the G and B three primary color signals, and the R, G and B three primary color signals are supplied to each output terminal for dubbing, and the horizontal synchronization signal separated from the luminance signal in the matrix circuit is used as the component signal for dubbing. Supplied to the output terminal.

Therefore, according to the present invention, dubbing can be performed in the state of the component signal without going through a color encoder, and the ID signal used for reverse line sequential processing on the master side can be transferred to the slave side. It can be used for line sequential processing on the master side, and a signal matching the line sequential color signal formed on the master side can be formed and recorded, and dubbing can be performed without deterioration of image quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of an example of a synchronization circuit of a reverse line sequentialization circuit in an embodiment of the invention, and FIG. 3 is a block diagram of an embodiment of the invention. FIG. 4 is a block diagram of another embodiment of the present invention, and FIG. 5 is a route diagram used to explain recording signals in one embodiment of the present invention. Explanation of main symbols in the drawings 3: Input terminal, 12.157 FM demodulation circuit, 19:
ID detection circuit, 16: Reverse line sequentialization circuit, 43-7a
, 9a: Output terminal for dubbing. Agent Patent Attorney Tadashi Sugiura Is it true that Ikoiro No. 41's Dominikaguchi Diagram 2 is Shichishu? Bekunomatahe 7 tram 6k I Figure 5

Claims (1)

[Claims] A color device that is supplied with a reproduced signal consisting of an FM-modulated luminance signal and a line-sequentialized signal of an FM-modulated first color difference signal and second color difference signal having mutually different carrier frequencies. An FM demodulation circuit that performs FM demodulation on the FM modulated luminance signal and generates a luminance signal; and FM demodulates the FM modulated first color difference signal and second color difference signal in a video signal reproducing device; An FM demodulation circuit that generates a line-sequential color signal, and detecting a change in the DC level of the line-sequential color signal, determines the horizontal period corresponding to the first color difference signal and the second color difference signal, respectively. a circuit for forming an ID signal for identification; a synchronization circuit for synchronizing the line sequential color signals using the ID signal; and the luminance signal, the synchronized color difference signal or the three primary color signals, and the ID signal. 1. A color video signal reproducing device, comprising: a signal output terminal for dubbing, and an output terminal for dubbing from which the signal is derived.