The color camera is mainly composed of three parts: a zoom lens, an image pickup device, and a circuit. The camera zoom lens marked "14 × 9", the shortest focal length (9) mm, the longest focal length (126) mm.
1. If the camera color temperature filter is adjusted to the "4800K" position under 4800K lighting conditions, the color temperature of the light entering the spectroscopic system after the color temperature filter is (3200K).
2. The (active) autofocus mode of the camera facilitates the shooting of darker or contrast (very low) scenes; (passive, TTL) autofocusing has the advantages of correct long-distance focusing and no parallax focusing.
3. The lower (minimum) the camera's minimum illuminance, the higher the sensitivity index, indicating that the camera performance is better.
4. The magnetic head of the video recorder is made of (soft magnetic) material, its coercive force (smaller), magnetic tape is made of (hard magnetic) material, its remanence is larger (larger)
5. Recorders that record the luminance signal and the chrominance signal separately on different tracks are called (component recording) type video recorders.
6. In order to solve the problem of low frequency end and broadband recording and playback, the (brightness) signal of the VHS format recorder adopts FM recording mode, and the (chroma) signal adopts down-frequency recording mode.
7. The cassette deck is driven by (the capstan)
8. In order to realize the automatic detection and protection with the first tape end, the U-type video tape and the VHS-type video tape are connected with a lead and a tail (transparent lead tape).
What is the servo reference signal? How is the reference signal of the external reference method generated?
Reference signal: A reference in a servo circuit whose frequency and phase represent the ultimate goal of the servo.
In the external reference mode, a frame pulse separated by an external video signal or a composite sync signal is used as a reference signal.
What problems are easy to edit with a video cassette recorder? Point out the solution.
Form a double recording area on the tape;
A blank area is formed on a tape after editing the exit point;
When changing from the playback mode to the recording mode, the reference amount of the servo system will change, and the servo will be confusing. The edit point signal is discontinuous in phase.
To solve the track problem, a rotary erase head is adopted; to solve the servo problem, a special editing servo method is adopted; to solve the phase problem, field sequence and framing control are performed. 5. 6. What are the requirements of the studio in brief?
Acoustic requirements: built in low-noise areas (such as the building's highest floor or built separately), reverberation time is short (wall ceilings with sound-absorbing materials), and sound insulation measures (acoustic gates, soundproof doors, etc.) are provided.
Space requirements: should be easy to operate, meet acoustic and optical requirements: the area is suitable, and the squareness of the length-width ratio should not be appropriate. Highly suitable for easy arrangement of lamps and heat dissipation.
Optical requirements: lighting fixtures complete, good stability. The color temperature is the same, the illumination is sufficient, the light field is uniform, and it is easy to adjust.
Easy to control observation
What part of the general camera's optical system? What is the role of each part?
Zoom lens: The role is imaging
Color temperature filter: The role is to adjust the color temperature (compensate for changes in spectral characteristics caused by different color temperatures of the light source)
Neutral filter: role is to adjust the amount of light into
Dividing system: The role is to split the light entering the lens into three beams of light: red, green, and blue.
What are the requirements of the studio in brief?
Acoustic requirements: built in low-noise areas (such as the building's highest floor or built separately), reverberation time is short (wall ceilings with sound-absorbing materials), and sound insulation measures (acoustic gates, soundproof doors, etc.) are provided.
Space requirements: should be easy to operate, meet acoustic and optical requirements: the area is suitable, and the squareness of the length-width ratio should not be appropriate. Highly suitable for easy arrangement of lamps and heat dissipation.
Optical requirements: lighting fixtures complete, good stability. The color temperature is the same, the illumination is sufficient, the light field is uniform, and it is easy to adjust. Easy to control observation
What problems are easy to edit with a video cassette recorder? Point out the solution.
Form a double recording area on the tape;
A blank area is formed on a tape after editing the exit point;
When changing from the playback mode to the recording mode, the reference amount of the servo system will change, and the servo will be confusing. The edit point signal is discontinuous in phase.
To solve the track problem, a rotary erase head is adopted; to solve the servo problem, a special editing servo method is adopted; to solve the phase problem, field sequence and framing control are performed.
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