JPH01149588A - Video tape recorder incorporated with video camera - Google Patents

Abstract

PURPOSE:To simplify a signal processing circuit part and to decrease power consumption by using the signal processing circuit part in common for the decoding of a carrier chrominance signal component and an encoding concerning a chrominance signal component. CONSTITUTION:A first recording state to record a carrier chrominance signal component C from an external signal input terminal 15 onto a magnetic tape TP and a second recording state to record a color video signal from a digital video camera 11 onto the tape TP are selectively adopted. In the first recording state, the component C from the terminal 15 is sampled by an A/D converter 17 and a digital carrier chrominance signal DC is outputted. The signal DC is decoded by a first signal processing circuit part 30. The circuit part 30 is used as a decoder to the signal DC when a first reproducing state is adopted, used as an encoder to the signal DC when a second reproducing state is adopted, a whole structure is simplified and the power consumption can be lowered.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Embodiment G-1 Configuration and operation (Fig. 1) G- 2 Modification H Effect of the Invention A Industrial Application Field The present invention includes a video camera section and an external signal input section,
The video signal sent out from the video camera section or the video signal supplied to the external signal input section is digitally processed, at least for the color signal component, and recorded on tape. The present invention relates to a video tape recorder integrated with a video camera, which is capable of transmitting a signal including a carrier color signal obtained based on a video camera.

B. Summary of the Invention The present invention comprises a video camera section and an external signal input section to which a video signal from the outside is supplied, and a video signal obtained from the video camera section or a video signal supplied to the external signal input section. In a video tape recorder integrated with a video camera, which performs digital processing on at least color signal components and records them on tape, and is capable of transmitting a signal including a carrier color signal based on a video signal obtained from a video camera section. , the carrier color signal component from the external signal input section is sampled and digitized based on a pulse signal having a predetermined frequency, and the digitized carrier color signal component and the color difference signal component from the video camera section are selected. It functions as a decoder for the selectively supplied and digitized carrier color signal components,
Furthermore, for color difference signal components from the video camera section, a first signal processing circuit section functioning as an encoder and a first signal processing circuit section are provided.
The signal processing circuit section functions as a decoder for the digitized carrier color signal component, and the color difference signal component obtained from the first signal processing circuit section and the color difference signal component from the video camera section are selectively selected. and a second signal processing circuit unit that encodes the supplied color difference signal component using a signal having a preset frequency, and encodes the color difference signal component obtained from the video camera unit or externally. The carrier color signal component from the signal processing section is digitally processed and recorded on tape, and the carrier color signal based on the color difference signal component obtained from the video camera section is sent out from the first signal processing circuit section. By doing so, the entire circuit configuration can be simplified and power consumption can be reduced.

C. Prior Art To reduce the overall size and weight of a video tape recorder (VTR) used to record color video signals on magnetic tape and to reproduce color video signals from the recorded magnetic tape.

2. Description of the Related Art In order to reduce power consumption, improve reliability, etc., various signal processing circuits are generally being digitized. When digitizing the entire signal processing circuit in such a VTR, the main issue is digitizing the circuit section that performs the processing required when recording the color video signal itself onto magnetic tape. Emphasis is placed on digitizing the color signal processing circuit section, which is responsible for processing the color signal components inside.

A VTR not only has the function of recording color video signals on a magnetic tape and reproducing them from the magnetic tape, but also has an integrated video camera as a color video signal source. A camera-integrated VTR has also been proposed. Video camera integrated VTR
has a function of selectively recording on a magnetic tape a color video signal sent out from a video camera and a color video signal supplied through an external signal input terminal;
It is said to have the function of sending out a composite color video signal formed based on the color video signal sent out from the video camera from the signal output terminal, but the entire signal processing circuit has been digitized. Originally,
For example, a configuration as schematically shown in FIG. 2 including a color signal processing circuit section is adopted.

In the schematic configuration of the conventional video camera-integrated VTR shown in FIG. ) color difference signal component D D (RY) and (B-Y) color difference signal component D D
A digital video camera block 1 is provided which is configured to send out a video signal consisting of (B-Y). Then, the digitized (R-Y) color difference signal components D D (R-Y) and (B-Y) color difference signal components D from the digital video camera block 1
D (B-Y) is supplied to the video signal processing circuit block 2, where it is digitally processed to become a low-frequency carrier color signal component, and at the same time, it is output from the terminal lO to the video signal processing circuit block 2. It is combined with the frequency modulated luminance signal component FY formed based on the luminance signal component DDY obtained from the digital video camera block l, which is supplied to the circuit block 2, to form a recording video signal V. Then, the recorded video signal (2) obtained from the video signal processing circuit block 2 is recorded on a magnetic tape in the video signal recording block 9.

Also, the digitized (R-Y) color difference signal component DD (R-
The color difference signal components D , (RY) color difference signal component D D (RY) and (B-Y) color difference signal component D D
A carrier color signal component C'' is obtained by orthogonal biaxial amplitude modulation according to The composite video signal Vcm is synthesized with the luminance signal component DDY from the digital video camera block 1 supplied through the synthesizer 4, and is outputted to the signal output terminal 6.

Further, in addition to the digital video camera block 1, an external signal input terminal 7 is provided, and a carrier wave frequency f ic of about 3.0 mm is input through this external signal input terminal 7.
The carrier color signal component C, which is 58 MHz, is supplied to a decoder block 8, where it is digitized and subjected to decoding. Then, from the decoder block 8, a (RY) color difference component D based on the carrier color signal component C (R-Y)
and (B-Y) chrominance component D (B-Y) are obtained and supplied to the video signal processing circuit block 2, where they are digitally processed and converted into a low frequency carrier chrominance signal component. and at that time terminal 1o
is supplied to the video signal processing circuit block 2 from the external signal input terminal 7, and is combined with the frequency modulated luminance signal component FY formed based on the luminance signal component corresponding to the carrier color signal component C supplied to the external signal input terminal 7, and then recorded. It is considered to be a video signal ■.

The recorded video signal V obtained from the video signal processing circuit block 2 is recorded on a magnetic tape in the video signal recording block 9.

D. Problems to be Solved by the Invention As described above, when the entire signal processing circuit in a video camera integrated VTR is digitized, it is especially important to digitize the (R- Y) color difference signal component D D (RY) and (B-Y) color difference signal component D D (B-Y), and
The portion including the color signal processing circuit section that handles the carrier color signal component C supplied through the external signal input terminal 7 is a digital
(RY) color difference signal component DD from video camera block 1 (RY) and (B-Y) color difference signal component DD
, (B-Y), an encoder performs encoding to obtain a carrier color signal component C" based on them.
Based on the carrier color signal from block 3 and external signal input terminal 7, < (RY) color difference component D (R
- Y) and (B-Y) color difference component D (B-Y), each of which is equipped with a decoder block 8 that performs decoding to obtain the color difference component D (B-Y), and is relatively complex and large-scale. The problem is that it is easy.

In view of these points, the present invention includes a video camera section and an external signal input section to which a video signal from the outside is supplied, and a digital video signal from the video camera section or the external signal input section. digitally processes at least the color signal of the video signal and records it on tape, and also sends out a signal containing a carrier color signal formed based on the video signal sent out from the video camera section from the signal output terminal. In addition to digitally processing the digitized color difference signal components from the video camera section, the color signal processing circuit section also digitizes the carrier color signal components supplied through the external signal input section and performs digital processing on the output. An object of the present invention is to provide a video camera integrated VTR whose configuration can be effectively simplified and power consumption reduced.

E. Means for Solving the Problems In order to achieve the above-mentioned object, the video camera integrated VTR according to the present invention operates based on a sampling clock signal having a predetermined frequency, and detects luminance signal components and color difference signals. It is equipped with a video camera section that sends out the components, and an external signal input section to which the carrier color signal components are supplied, and the carrier color signal components from the external signal input section are sampled based on a pulse signal having a predetermined frequency. an analog/digital (A/D) converter to which an analog/digital (A/D) converter is applied and digitized; a first signal processing circuit unit to which the output of the A/D converter and the color difference signal component from the video camera unit are selectively supplied; a digital processing section including a signal output section connected to the signal processing circuit section and a second signal processing circuit section disposed on the output side of the first signal processing circuit section; and a recording operation section for recording a recording signal including the output of or a signal obtained based on the output on the tape. Then, the first signal processing circuit unit
It functions as a decoder for the output of the D conversion section and as an encoder for the color difference signal component from the video camera section. The first signal processing circuit section functions as an encoder for the color difference signal components from the camera section and derives the carrier color signal component obtained from the first signal processing circuit section to the outside. ,
With the first signal processing circuit section functioning as a decoder for the output of the A/D conversion section, the color difference signal component obtained from the first signal processing circuit section and the color difference signal component from the video camera section are selected. encoding is performed using a signal having a preset frequency for the supplied color difference signal component.

F Effect In the video camera integrated VTR according to the present invention configured as described above, regarding the recording of the color signal component in the video signal, the state in which the carrier color signal component supplied through the external signal input section is recorded and the video camera A state in which the color difference signal components from the part are recorded is selectively taken.

In a state in which the carrier color signal component supplied through the external signal input section is recorded, the carrier color signal component from the external signal input section is digitized in the A/D conversion section and then transferred to the first signal processing circuit section. At , decoding is performed on the output of the A/D converter, and a color difference signal component based on the carrier color signal component from the external signal input section is obtained from the first signal processing circuit. Then, in the second signal processing circuit section, encoding using a signal having a preset frequency is performed on the color difference signal component from the first signal processing circuit section, and the color difference signal component from the first signal processing circuit section is encoded using a signal having a preset frequency. For example, a low-frequency carrier color signal component is obtained, which is used as a recording signal and recorded on a tape by a recording operation section.

On the other hand, in a state where the color difference signal component from the video camera section is recorded, the digitized color difference signal component from the video camera section is supplied to the second signal processing circuit section, and the color difference signal component digitized from the video camera section is supplied to the second signal processing circuit section. In this step, the color difference signal component from the video camera section is encoded using a signal having a preset frequency. As a result, the second signal processing circuit section obtains, for example, a low-frequency carrier color signal component based on the color difference signal component from the video camera section, which is recorded on the tape by the recording operation section as a recording signal. Ru. At the same time, the color difference signal components from the video camera section are supplied to the first signal processing circuit section, and the first signal processing circuit section encodes the color difference signal components from the video camera section. As a result, a carrier color signal component based on the color difference signal component from the video camera section is obtained from the first signal processing circuit section, and this carrier color signal component is led out through the signal output section.

By doing this, the decoding of the carrier color signal component from the external signal input section after it has been digitized, and the encoding of the digitized color difference signal component from the video camera section. However, the first signal processing circuit section is commonly used to digitize the carrier color signal component from the external signal input section and perform digital processing on the output, as well as to digitize the color difference signal from the video camera section. The configuration of the digital processing section that performs digital processing on the components is simplified and power consumption is reduced.

G Embodiment G-1 Configuration and Operation (FIG. 1) FIG. 1 schematically shows an example of a video camera integrated VTR according to the present invention.

In the example shown in FIG. 1, a digital video camera 11 is provided, which is configured using, for example, a CCD image sensor and forms a color video signal according to the NTSC system. A pulse signal PC from a pulse generator 13 using a crystal oscillator is supplied to the digital video camera 11 as a sampling clock signal, and the frequency of the pulse signal PC from the pulse generator 13 is, for example, Carrier wave frequency rsc# of a carrier color signal in a color video signal according to the NTSC system 3.
The frequency is selected to be four times 58MHz (4·fsc). Then, from the digital video camera 11 which operates using the pulse signal PC as a sampling clock signal,
A color video signal according to the NTSC system was digitized with a digitized luminance signal component DDY (R-
Y) Color difference signal component DD (17-Y) and (B-Y) Color difference signal component DD (B-Y) are respectively sent out individually.

Further, an external signal input terminal 15 is also provided, and the carrier color signal component C of a color video signal according to the NTSC system is supplied to this external signal input terminal 15.

In this example, the carrier color signal component C supplied through the external signal input terminal 15, together with the corresponding luminance signal component, is connected to the first recording state recorded on the magnetic tape TP and to the digital video camera 11. A second recording state in which a color video signal sent from the magnetic tape TP is recorded on the magnetic tape TP is selectively taken.

When the first recording state is taken, the switches 19 and 21 are controlled by the switch control signal Ss from the terminal 23.
The switches 43 and 45 are activated by the switch control signal Ss from the terminal 47, and the switches 59 and 61 are activated by the switch control signal Ss from the terminal 63, respectively.
The connection state is as shown by the solid line in the figure. Further, the recording/reproducing switches 85 and 87 are controlled in conjunction with each other by the switch control signal St supplied from the terminal 89, so that the movable contact 85q of the recording/reproducing switch 85 is connected to the selection contact 85r, and the recording/reproducing switch 87 is connected to the selection contact 85r. The movable contact 87q is connected to the selection contact 87r. It will be done like this.

Under such circumstances, the carrier color signal component C from the external signal input terminal 15 is supplied to the A/D converter 17. The A/D converter 17 is supplied with the pulse signal PC from the pulse generator 13 as a sampling pulse signal, and
The A/D converter 17 performs sampling based on the pulse signal PC for the carrier color signal component C, and the A/D converter 17 converts the carrier color signal component C to its carrier frequency f.
A digital carrier color signal DC, which is obtained by being digitized by sampling at a frequency (4·r sc) four times that of sc, is sent out.

The digital carrier color signal DC is directly supplied to the selection contacts 25a and 27a of the switches 25 and 27 via the switches 19 and 21, and the polarity reversing unit 2
9 and 31 to select contacts 25c and 27c of switches 25 and 27, respectively. The control ends of the switches 25 and 27 each have a frequency of 4 f sc /4 = f sc by dividing the pulse signal PC from the pulse generator 13 by 1/N, specifically, by 174. A sine wave signal CN and a cosine wave signal CN are generated from the 1/N frequency divider 33 that forms a sine wave signal CN and a cosine wave signal CN.
A wave signal CN2 is respectively supplied. These switches 25 and 27, polarity reversing sections 29 and 31, and 1/N frequency dividing section 33 constitute a first signal processing circuit section 30 that functions as a decoder for the digital carrier color signal DC.

In the first signal processing circuit section 30, the switch 2
5 has a selection contact 25b which is an empty contact between selection contacts 25a and 25c, and the movable contact 25
d, the sine wave signal CN from the 1/N frequency divider 33 takes a level at the positive peak and its vicinity, at the selection contact 25a, the sine wave signal CN takes a level at the zero level and its vicinity. It is assumed that the sine wave signal CN is connected to the selection contact 25b during the period, and to the selection contact 25c during the period in which the sine wave signal CN is at the negative peak and its vicinity. Thereby, the movable contact 2 of the switch 25
5d, with a period of l/(4·fsc) synchronized with the digital carrier color signal DC and the sine wave signal CN,
A decoded signal is obtained by sequentially and repeatedly multiplying by +1.0 and -1, and this signal is, for example, the (RY) color difference component D (RY)'. Further, the switch 27 has a selection contact 27b which is an empty contact between the selection contacts 27a and 27c, and the movable contact 27d is connected to the
The cosine signal CN! is applied to the selection contact 27a during the period in which the s-wave signal CN pressure side peak and its neighboring level are taken.
is at the selection contact 27b during the period when the cosine wave signal CN is at the zero level or a level near it, and at the selection contact 27b during the period when the cosine wave signal CN is at the negative peak or a level near it.
7c, respectively.

As a result, the movable contact 27d of the switch 27 repeatedly multiplies the digital carrier color signal DC by +1, 0 and -1 in sequence with a period of 1/(4·fsc) synchronized with the cosine wave signals C and Nt. For example, (B-
Y) color difference component D (B-Y)'.

The sine wave signal C sent out from the above-mentioned 1/N frequency dividing section 33
N and the cosine wave signal CNt have a frequency rsc, but are in an asynchronous relationship with the carrier wave signal of the carrier color signal component C supplied to the external signal input terminal 15. For this reason, the movable contact 25d of the switch 25 has (R-Y
) chrominance component D (RY)'', and.

The (B-Y) color difference component D (B-Y)' obtained at the movable contact 27d of the switch 27 is the carrier color signal component C, respectively.
The (RY) color difference signal component and the (B-Y) color difference signal component forming the (R-Y) color difference signal component D (R-Y)', and (B
-Y) The phase error accompanying each color difference component D (B-Y)" is arranged on the output side of the switches 25 and 27, and
RY) color difference component D (RY)'' and (B-Y) color difference component D (B-Y)' are connected to switches 43 and 4, respectively.
The signal is corrected in an automatic phase control (APC) loop unit 50 supplied through the 5-channel.

In the APC loop section 50, the (RY) color difference component D (RY)' obtained at the movable contact 25d of the switch 25 and passed through the switch 43, and the color difference component D (RY)' obtained at the movable contact 27d of the switch 27 and passed through the switch 45. Through (B-Y)
The color difference component D (B-Y)' is multiplied by correction signals E and E2 sent from a voltage controlled oscillator (VCO) 53 in multipliers 49 and 51, respectively. The correction (R-
Y) The color difference component D (R-Y) and the corrected (Ili-Y) color difference component D (B-Y) obtained from the multiplication unit 51 are supplied to the comb-shaped filter 57 to remove the luminance signal component contained in each. will be held. obtained from the comb filter 57,
Corrected (RY) color difference component D from which the luminance signal component has been removed
(RY) and correction (B-Y) color difference component D (B-Y)
is supplied to the error detection unit 55, and in the error detection unit 55, the correction (R4) color difference component D (R-Y) and the correction (B-Y
) Color Difference Component D(B-Y) The level of the (RY) axis component of the color burst signal included in D is detected, and a control signal PE is generated according to the detected level. Then, the control signal PE obtained from the error detection section 55 is supplied to the VCO 53, and the frequencies of the correction signals E1 and R2 sent out from the VCO 53 are controlled according to the control signal PE. Correction (
The phase of the corrected (B-Y) color difference component D (B-Y) obtained from the multiplication section 51 is controlled, and as a result, the phase of the correction (B-Y) color difference component D (B-Y) obtained from the multiplication section 51 is controlled, and as a result, the phase of the correction (B-Y) color difference component D (B-Y) obtained from the multiplication section 51 is Correction (R-Y) Color difference component D (R-Y) and correction (R-Y)
B-Y) Color Difference Component D The level of the (R-Y) axis component of the color burst signal included in (B-Y) is made zero. That is, the correction (R-Y) color difference component D (R-Y) and the correction (It
-Y) Color difference component D (B-Y) has no phase error with respect to the (R-Y) color difference signal component and (B-Y) color difference signal component forming the carrier color signal component C. It is made so that it becomes.

In this way, the phase correction is performed by the APC loop section 5o, and the luminance signal component is removed by the comb filter 57.
) Color difference component D (R-Y) and (B-Y) Color difference component D
(B-Y) are supplied through switches 59 and 61 to multiplication units 65 and 67 in the second signal processing circuit unit 70 forming an encoder, respectively.

In the second signal processing circuit section 70 forming the encoder, a VCO 69 performs frequency control based on a control signal Sc from an automatic frequency control circuit section (AFC circuit section) 73 to which a horizontal synchronizing signal Sh is supplied through a terminal 71. , each having a predetermined frequency, e.g. approximately 743k
A pair of reference signals S1 and S2, which have Hz and have a phase difference of 90 degrees, are input to the multiplier 65.
and 67, respectively. Then, in the multiplier 65, the (RY) color difference component D(R
-Y) and the reference signal S are multiplied by (R-Y
) chrominance component D (RY) is encoded, and from the multiplier 65, (RY) chrominance component D (
A low-frequency carrier component L D (RY) based on the comb filter 57 is obtained, and in the multiplier 67, the (B-Y) color difference component D (B-Y) from the comb filter 57 and the reference signal St (B-Y) color difference component D (B-
Y) is encoded, and the multiplier 67
From (B-Y), a low-frequency carrier component L D (B-Y) based on the color difference component D (B-Y) is obtained.

Low-frequency carrier components L D (RY) and L D (B-Y) obtained from the multipliers 65 and 67 in this way, respectively.
are mutually added to form a low frequency carrier color signal component LD in the combining section 75, and then digital/analog (D/A
) is supplied to the converter 77, converted into an analog signal from the D/A converter 77, and has a carrier frequency of approximately 743k, for example.
A low frequency carrier color signal LC is derived. This low frequency carrier color signal LC is amplified by a recording amplifying section 79 and then passed through a recording amplifying section 83 to a synthesizing section 81.
The recording video signal V is frequency-multiplexed with the luminance signal FY, which is a frequency-modulated luminance signal component supplied to the recording video signal V. Then, the recording video signal V is transmitted to the selection contact 85r and the movable contact 85q of the recording/playback switch 85, and the selection contact 87r and the movable contact 87 of the recording/playback switch 87.
q to each of the rotating magnetic heads 91 and 93, and under the condition that the rotating magnetic heads 91 and 93 alternately contact the magnetic tape TP with a slight overlap, a large number of inclined tracks are formed on the magnetic tape TP. recorded with.

On the other hand, when the second recording state is taken, switch 1
9 and 21 are activated by the switch control signal Ss from the terminal 23, the switches 43 and 45 are activated by the switch control signal Ss from the terminal 47, and the switches 59 and 61 are activated by the switch control signal Ss from the terminal 47.
are brought into a connected state as shown by broken lines in FIG. 1, respectively, by the switch control signal Ss from the terminal 63. Further, the recording/playback switches 85 and 87 are interlocked and controlled by the switch control signal St supplied from the terminal 89, as in the case described above, so that the record/playback switch 85 and 87 are
The movable contact 85q of the recording/reproducing switch 87 is connected to the selection contact 85r, and the movable contact 87q of the recording/reproduction switch 87 is connected to the selection contact 87r.

Under such circumstances, the (RY) color difference signal component D D (RY
) and CB-Y) color difference signal component D D (B-Y) is
The signals are supplied through switches 59 and 61, respectively, to multipliers 65 and 67 in a second signal processing circuit 70 forming an encoder.

In the second signal processing circuit section 70 forming the encoder, in the same manner as in the case where the above-mentioned first recording state is taken, in the multiplication section 65, the digital video camera 1
The (RY) color difference signal component DD (RY) from 1 is multiplied by the reference signal S1 from the VCO 69, and encoding is performed for the (RY) color difference signal component DD (RY). From the multiplier 65, the low frequency carrier component L based on the (RY) color difference signal component D D (RY)
D (RY) is obtained, and in the multiplier 67, (7) (B-Y
) The color difference signal component D D (B-Y) is multiplied by the reference signal St from the VCO 69 (t+-y) to encode the color difference (K component D D (B-Y)), and from the multiplier 67 , (B-Y) Low frequency carrier component LD (B-Y) based on color difference signal component D D (B-Y)
Y) is obtained.

In this way, from the multipliers 65 and 67, the (RY) color difference signal component DD (RY) and (B-Y) color difference signal component DD(
The low-frequency carrier component L D (R
-Y) and L D (B-Y) are added together in the combining section 75 to form the low-frequency carrier color signal component LD, and then
It is supplied to the D/A converter 77, and from the D/A converter 77,
It is an analog signal, and the carrier frequency is approximately 74, for example.
A low frequency carrier color signal LC of 3 kHz is derived. This low frequency carrier color signal LC is amplified by a recording amplifying section 79 and then sent to a synthesizing section 81 based on a luminance signal component DDY from the digital video camera 11, which is supplied to the synthesizing section 81 through a recording amplifying section 83. The recorded video signal V is frequency-multiplexed with the luminance signal FY obtained as a frequency-modulated luminance signal component. Then, the recording video signal (2) is transmitted to the rotating magnetic heads 91 and 93, respectively, through the selection contact 85r and movable contact 85q of the recording/playback switch 85, and the selection contact 87r and movable contact 87q of the recording/playback switch 87. The magnetic tape TP is supplied with a large number of inclined tracks and recorded on the magnetic tape TP.

In addition to this, the (R-Y) color difference signal component D D (R
-Y) and (B-Y) color difference signal component D D (B-Y)
are supplied to the APC loop unit 50 through switches 43 and 54, respectively.

(R-Y) color difference signal component D D supplied to the APC loop section 50 (R-Y) and (B-Y) color difference signal component D
For D (B-Y), the (R-Y) color difference component D (R-Y) under the above-mentioned first recording state is
Similarly to the case of "and (B-Y) color difference component D (B-Y)", the multiplier 49 applies the correction signal E from C053 to (R-Y) color difference signal component D D (R-Y). , and phase correction is performed in the multiplier 51 by multiplying the (B-Y) color difference signal component D D (B-Y) by the correction signal Et from the VCO 53 . In this way, the (R-Y) color difference signal components D D (R-Y) and (R-Y) whose phase has been corrected by the APC loop unit 50
B-Y) The color difference component D D (B4) is supplied to the first signal processing circuit section 30 through the switches 19 and 21.

The first signal processing circuit section 30 processes (RY) color difference signal component D D (R-Y) and (B-Y) color difference signal component D D
For (B-Y), it functions as an encoder, and the (R-Y) color difference signal component D D (R-Y) and (B-'Y) color difference signal component DD ( B-Y) are supplied directly to the selection contacts 25a and 27a of the switches 25 and 27, respectively, and are supplied to the selection contacts 25c and 27c of the switches 25 and 27 through the polarity inverters 29 and 31, respectively. When the switches 25 and 27 are supplied with the sine wave signal CN
and cos wave signal CN.

It is activated according to the As a result, the movable contact 25d of the switch 25 receives the (RY) color difference signal component D D
1/(4
・The carrier color signal component DC (R-Y
), and the movable contact 27d of the switch 27 has the (B-Y) color difference signal component D D (B-
1/(4-fsc
) with a period of +1. A carrier color signal component DC(B-Y) with a carrier frequency of fsc, which is an encoded signal obtained by sequentially and repeatedly multiplying O and -1, is obtained.

In this way, the carrier color signal component D C (RY) and the carrier color signal component D C (B-Y) obtained at the movable contact 25 d of the switch 25 and the movable contact 27 d of the switch 27, respectively
) are combined in the combining section 35 , and the carrier color signal DDC is obtained from the combining section 35 and further supplied to another combining section 37 . The combining unit 37 receives the luminance signal component D sent from the digital video camera 11 through the terminal 39.
DY is also supplied, and a composite video signal Vcp is obtained by combining the carrier color signal DDC and the luminance signal component DDY from the combining section 37, which is output to the video signal output terminal 41.
is derived.

Note that when the video camera integrated VTR of this example enters the playback state, the record/playback switches 85 and 87 are pressed.
are controlled in conjunction with the switch control signal St supplied from the terminal 89, so that the movable contact 85q of the recording/playback switch 85 is connected to the selection contact 85p, and the movable contact 87q of the recording/playback switch 87 is connected to the selection contact 87p. Made to be connected. Then, while the rotating magnetic heads 91 and 93 alternately scan the inclined tracks formed on the magnetic tape TP with some overlap, the rotating magnetic heads 91 and 93 scan the reproduced video from the magnetic tape TP. Signals are obtained alternately and are supplied to reproduction amplification sections 95 and 97 through recording/reproduction switches 85 and 87 for subsequent reproduction processing.

As described above, the (R-Y) color difference signal component DD (RY) and (B-Y) color difference signal component DD (B-Y) sent out from the digital video camera 11 and the external signal input The carrier color signal component C supplied from the terminal 15 is
It is selectively digitally processed into a low-frequency carrier color signal LC, which is further frequency-multiplexed with a frequency-modulated luminance signal component FY, and is recorded on a magnetic tape TP and sent out from a digital video camera 11 (R -Y) A carrier color signal DDC is formed based on the color difference signal component D D (R-Y) and (B-Y) color difference signal component D D (B-Y), and the luminance transmitted from the digital video camera 11. A composite video signal Vcp formed by combining the signal component DDY is obtained at the video signal output terminal 41. In the above configuration, the first signal processing circuit section 30 is used as a decoder for the digital carrier color signal DC when the first reproduction state is taken, and when the second reproduction state is taken. (R-Y) color difference signal component D D (R-Y
) and (B-Y) color difference signal components D D (B-Y). Therefore, the entire configuration is simplified and power consumption is reduced.

G-2 Modified Example The above example handles color video signals in accordance with the NTSC system, but the video camera integrated VTR according to the present invention may also handle color video signals in accordance with the PAL system. be.

For example, when the above example is modified to handle a color video signal according to the PAL system, the pulse generator 1
The pulse signal PC from 3 has its frequency equal to the carrier frequency f of the carrier color signal of the color video signal according to the PAL system.
scp″=, 3 times 4.43MHz (3・f 5cp
), and the 1/N frequency dividing section 33 is
The pulse signal PC from the pulse generator 13 is frequency-divided by 1/3 to form a sine wave signal CN + and a cosine wave signal CN, each having a frequency of 3·f scp/3=fscp.

In such a case, for example, when the first recording state is taken, the (RY) color difference component D (RY)' obtained at the movable contact 25d of the switch 25 and the movable switch 27 The (B-Y) color difference component D (B-Y)' obtained at the contact point 27d is the (R-Y) color difference signal component and (B- Y) Approximately 330k for color difference signal components
with a frequency offset of Hz, such that (R
-Y) chrominance component D (RY)', and (B-Y)
Approximately 330 yen associated with each of the color difference components D (B-Y)'
The kHz frequency offset is corrected in the APC loop unit 50. Then, the error detection section 55 in the APC loop section 50 detects the correction (RY) obtained from the multiplication sections 49 and 51 and passed through the comb filter 57.
Color difference component D (R-Y) and correction (B-Y) Color difference component D
The color burst signal included in (B-Y) is made to correspond to the corrected (R-Y) color difference component D (R-Y).
degree and correction (B-Y) color difference component D (B-Y)
The signal obtained by shifting the phase by +45 degrees corresponding to (
The level of the (RY) axis component is detected and a control signal PE is generated according to the detected level.

Furthermore, the VCO 6 forming the second signal processing circuit section 70
9 is assumed to send out a pair of reference signals Sl and S2, each having a frequency of approximately 732 kHz and having a phase difference of 90 degrees between them.

The modified example configured in this way that handles color video signals according to the PAL system is similar to the example described above with reference to the drawings, which handles color video signals according to the NTSC system. This will provide you with the desired effects.

Further, in the above example, the second signal processing circuit section 70
The low frequency carrier color signal component LD obtained from the video signal component LD is converted into an analog signal by the D/A converter 77 and recorded on the magnetic tape TP by the rotating magnetic heads 91 and 93. In the camera-integrated VTR, the low-frequency carrier color signal component LD obtained from the second signal processing circuit section 70 is transferred to the magnetic tape by rotating magnetic heads 91 and 93 as a digital signal without being converted into an analog signal. It may also be recorded in the TP.

Effects of the Invention H As is clear from the above explanation, the video camera integrated VTR according to the present invention can at least convert the digitized video signal from the video camera section or the video signal supplied to the external signal input section into The color signal is digitally processed and recorded on tape, and when the signal containing the carrier color signal, which is formed based on the video signal sent from the video camera section, is sent out from the signal output terminal, an external signal input is required. A predetermined signal processing circuit unit is commonly used for decoding of the carrier color signal component from the video camera unit after it has been digitized and encoding of the color difference signal component of the video signal from the video camera unit. It will be carried out,
The carrier color signal supplied through the external signal input section is digitized and the output is digitally processed.
The configuration of the color signal processing circuit unit that performs digital processing on the digitized color difference signal components from the video camera unit can be effectively simplified and power consumption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing an example of a video camera integrated VTR according to the present invention, and FIG. 2 is a block diagram schematically showing a conventional video camera integrated VTR proposed. In the figure, 11 is a digital video camera, 13 is a pulse generation section, 15 is an external signal input terminal, 17 is an A/D conversion section, 30 is a first signal processing circuit section, 33 is a 1/N frequency division section,
35, 37.75 and 81 are combining sections, 41 is a signal output terminal, 49, 51.65 and 67 are multiplication sections, and 50 is an APC
The loop portions 53 and 69 are (1) C0170 is a second signal processing circuit portion, 91 and 93 are rotating magnetic heads, and TP is a magnetic tape.

Claims (1)

[Scope of Claims] A video camera section that operates based on a sampling clock signal having a predetermined frequency and sends out a luminance signal component and a color difference signal component; an external signal input section to which a carrier color signal component is supplied; , an analog/digital converter that samples and digitizes the carrier color signal component from the external signal input section based on a pulse signal having a predetermined frequency; and an output of the analog/digital converter and the video camera section. , and functions as a decoder for the output of the analog/digital conversion section, and functions as an encoder for the color difference signal component from the video camera section. a carrier color signal obtained from the first signal processing circuit section when the first signal processing circuit section functions as an encoder for the color difference signal component from the video camera section; a signal output section that derives the component to the outside; and a color difference obtained from the first signal processing circuit section when the first signal processing circuit section functions as a decoder for the output of the analog/digital conversion section. a second signal processing circuit unit to which the signal component and the color difference signal component from the video camera unit are selectively supplied, and performs encoding of the supplied color difference signal component using a signal having a preset frequency; and a recording operation section for recording onto a tape a recording signal that includes the output of the second signal processing circuit section or a signal obtained based on the output, and a video tape integrated with a video camera. recorder.