JP3508267B2 - Camera integrated VTR - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a camera-related integrated VT R of the crystal oscillator and the crystal oscillator used in the video processing unit was set to cover a single crystal oscillator used in the camera processing unit.

[0002]

2. Description of the Related Art Generally, a camera-integrated VTR is provided with a camera processing unit for performing an image pickup process and a video processing unit for performing a video process on an image picked up by the camera unit. Further, conventionally, the camera processing section and the video processing section are each provided with an independent crystal oscillator, and the camera signal processing performed in the camera processing section and the video signal processing performed in the video processing section are performed. Respectively, each signal processing is performed based on a unique subcarrier frequency fsc that is not managed at all. Therefore, in the related art, in the video processing unit, the phase matching process is performed by the automatic phase adjusting device (APC) at the time of the video signal processing even during the image pickup by the camera, thereby ensuring the consistency between the both processing units. It was designed to be kept.

[0003]

However, in the above-mentioned conventional camera-integrated VTR, it is necessary to provide the camera processing section and the video processing section with their own crystal oscillators. However, there is a problem that the cost and the space factor increase. Further, in the video processing unit, an automatic phase adjustment device (AP
Since the phase matching process according to C) has to be performed, there is a problem that the automatic phase adjuster (APC) becomes a noise source and the S / N ratio of signal processing deteriorates.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to reduce the number of parts of the crystal oscillator by integrating the crystal oscillator used in the camera processing unit and the video processing unit. It is to provide a camera-integrated VT R which is adapted Figure is a reduction in cost as possible reduced to one.

[0005]

In order to achieve the above object, a camera-integrated VTR according to the present invention is a camera-integrated VTR having an image pickup processing function and a video processing function, and is based on a subcarrier frequency fsc. Generates oscillation frequency
A crystal oscillator that an oscillation generated by the crystal oscillator
A clock generator for forming a reference clock based on the frequency, the formed by the clock generator reference clock
The camera signal is processed based on the
Clock signal of subcarrier frequency fsc formed from lock
Signal output from the camera processing unit
Based on the clock of the input subcarrier frequency fsc.
Video processing unit for processing a video signal, and the camera processing unit
Based on the clock of the subcarrier frequency fsc output from
FM modulation for audio to modulate audio signal
It is characterized in further comprising a circuit.

Further, the camera-integrated VT R, the subcarrier frequency fsc, wherein the camera unit and that is phase-locked to both at the same phase of the video processing section.

[0007]

The crystal oscillator of the clock generator outputs an oscillation frequency that is eight times the subcarrier frequency fsc, and the clock generator outputs a reference clock based on the oscillation frequency of the crystal oscillator. Then, in the camera processing unit, signal processing is performed based on the clock from the clock generation unit, and the subcarrier frequency fsc is output. further,
In the video processing unit, signal processing is performed using the subcarrier frequency fsc output from the camera processing unit.

Therefore, in the camera processing unit and the video processing unit, signal processing is performed based on the clock output from the clock generation unit, so that a crystal oscillator for camera signal processing and a crystal oscillator for video signal processing are provided. It becomes possible to unify, and only one crystal oscillator is required, and the cost can be reduced. Further, the clock and the sub-carrier frequency fs are generated based on a frequency that is eight times the sub-carrier frequency fsc oscillated from the crystal oscillator of the clock generator.
Since c is formed, the clock used in the camera processing unit and the phase of the subcarrier frequency fsc used in the video processing unit are fixed and phase locked, and the automatic phase as the video processing unit is used during the camera recording. Adjusting device (A
Since the processing by the PC) is unnecessary, and as a result, the processing by the automatic phase adjuster (APC) is not required,
The S / N ratio is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a schematic block diagram illustrating the clock system of the camera-integrated VT R of this embodiment, reference numeral 1 denotes a clock system circuit of the camera-integrated VT R, 3 is the camera unit clock signal generator (TG ), 5 indicates a camera processing unit (CAMERA CORE), and 7 indicates a video processing unit (VIDEO).

The clock generator 3 is provided with a crystal oscillator 9, and the oscillation frequency of the crystal oscillator 9 is 28 MH.
z, that is, an oscillation frequency set to 8 times the subcarrier frequency fsc is used. In the clock generator 3, the oscillation frequency of the crystal oscillator 9 (8 × fsc)
Based on the sampling clock for the CCD (MC
K), reference clock (CL) for CRT, clock (XRS) and pulse (VSHP) for sample and hold
Is output. As the reference clock, in the case of the NTSC system, horizontal synchronization has a frequency of 910 fH, and P
In the case of the AL method, the horizontal synchronization has a frequency of 908 fH.

The sampling clock (MCK) is
The reference clock (CL) is a clock having a constant frequency regardless of the resolution of the CCD, and the frequency is 8 × fsc. The clock (XRS) and the pulse (VSHP) are the clock and the pulse used to determine the sampling timing at the sample hold in the sample hold (S / H) described later.

The clock (XRS) and the pulse (V
SHP) is input to the sample hold circuit (S / H) 11, and the sample hold circuit 11 samples and holds the video signal transferred from each cell of the CCD sensor, and the sampled and held signal is the A / D converter 13. At, the video signal is quantized and digitized and input to the camera processing unit 5. The sampling clock (MC
K) is input to the camera processing unit 5, the auto focus detection circuit (AFD) 15 and the A / D converter 13 and is used in the auto focus detection circuit 15 to sample the signal from the light receiving element array.
It is also used in the / D converter 13 for digital conversion. The autofocus detection circuit 15 detects whether the subject captured by the camera is in focus by the focus lens, and is composed of a light receiving element.

The reference clock (CL) is input to a driver circuit (FOCUS PRE DRIVER) 17 of a pulse motor for driving a focus lens of a video camera and an angular velocity A / D converter 19. In the pulse motor driver circuit 17, the reference clock (CL) is used as a clock for the motor drive pulse, and in the angular velocity A / D converter 19, the sampling signal from the angle sensor for detecting the direction of the camera shake is digital. Used as a clock for conversion. Further, the reference clock (CL) is used for various signal processing in the camera processing section.

From the camera processing unit 5, the sampling clock (DICK) is used as an image stabilization circuit (Z-VIST).
A) 21 and camera noise reduction circuit (CAM
ERA CNR) 23. The sampling clock (DICK) is configured as a clock having the same frequency as the sampling clock (MCK) and a different phase, and is used to perform correction due to camera shake in the camera shake prevention circuit 21 and the camera noise reduction circuit 23.
Used to reduce camera noise.

Further, in the camera processing section 5, the subcarrier frequency f based on the reference clock (CL).
sc is formed, and the FM modulation circuit (AF
M) 25 and the video processing unit 7. In the audio FM modulation circuit 25, based on the subcarrier frequency fsc input from the camera processing unit 5, 1.5 MHz / 1.7 MHz for stereo audio carrier.
Is modulated to the signal. In the video processing unit 7, the sub-carrier frequency f input from the camera processing unit 5
Various signal processes are performed based on sc.

[0016] In such a camera-integrated VT R, subcarrier frequency fs from the crystal oscillator 9 of the clock generator 3
An oscillation frequency that is eight times as high as c is output, and the clock generating unit 3 outputs a reference clock based on the oscillation frequency of the crystal oscillator 9. Further, the camera processing unit 5 performs signal processing based on the clock from the clock generation unit 3 and outputs the subcarrier frequency fsc. further,
In the video processing unit 7, signal processing is performed using the subcarrier frequency fsc output from the camera processing unit 5.

Therefore, in the camera processing unit 5 and the video processing unit 7, signal processing is performed based on the clock output from the clock generation unit 3, so that the crystal oscillator 9 for camera signal processing and the video signal processing are performed. Crystal oscillator 9
It becomes possible to unify the above, and only one crystal oscillator 9 is required, and the cost can be reduced. Further, since the clock and the sub-carrier frequency fsc are formed based on a frequency that is eight times the sub-carrier frequency fsc of the crystal oscillator 9 of the clock generator 3, the clock used in the camera processor 5 and the video processor 7 are used. The phase of the subcarrier frequency fsc to be generated is fixed and locked, and the processing by the automatic phase adjusting device (APC) as the video processing unit 7 is not necessary at the time of camera recording, and as a result,
The S / N ratio is improved because no processing by an automatic phase adjuster (APC) is required.

[0018]

As described above, the camera according to the present invention
According to the integrated VTR, the oscillator generated by the crystal oscillator is
The camera signal based on the reference clock based on the vibration frequency
A camera processing unit for processing is provided.
A clock of a subcarrier frequency fsc formed from a reference clock.
FM signal for video processing section and audio
And output to. With this configuration, the bidet
In the processing section, the crystal oscillator output from the camera processing section
Sub clock formed from the reference clock based on the oscillation frequency
Video signal is generated based on the clock of carrier frequency fsc
Can be processed. Along with this, F for audio
Crystal oscillator output from the camera processor in the M modulation circuit
Formed from a reference clock based on the oscillation frequency by
Audio based on the clock of subcarrier frequency fsc
The signal can be modulated. Therefore, the crystal oscillator for camera signal processing and the crystal oscillator for video signal processing can be integrated, and only one crystal oscillator is required.
Ru it is possible to reduce the cost.

[Brief description of drawings]

[1] relates to an embodiment of the present invention, a camera-integrated VT R
3 is a schematic block diagram showing the clock signal system of FIG.

[Explanation of symbols]

3 clock generator 5 Camera processing unit 7 Video processing unit 9 Crystal oscillator fsc subcarrier frequency

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-5-344512 (JP, A) JP-A-7-264465 (JP, A) JP-A-62-242485 (JP, A) JP-A-64- 65990 (JP, A) JP-A-5-41852 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 H04N 5/225

Claims (2)

(57) [Claims] 1. A camera-integrated VTR having an image pickup processing function and a video processing function , comprising a water crystal oscillator for generating an oscillation frequency based on a subcarrier frequency fsc, and the crystal oscillator. Based on the generated oscillation frequency
A clock generator for forming a reference clock, the reference clock based on which is formed by the clock generator
The camera signal is processed based on the
To generate a clock signal with a subcarrier frequency fsc
The camera processing unit that outputs the subcarrier frequency fsc output from the camera processing unit
Processing that processes the video signal based on the clock of the
Section and the subcarrier frequency fsc output from the camera processing section
Audio that modulates an audio signal based on
Camera integrated VT R, characterized in that it comprises an FM modulation circuit for I o. 2. The camera-integrated type V according to claim 1, wherein the sub-carrier frequency fsc is phase locked to the same phase in both the camera processing unit and the video processing unit.
T R.