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oleg1000 ( Слушатель ) |
| 31 авг 2010 в 23:14 |
Цитата: Лунный Гоблин
Эта таблица 1-5 о CTV формате, обратите внимание там 29.97 частота кадров NTSC и сравните с частотой у камеры.
А вот в следующей таблице 1-6 указан видеосигнал с самой камеры, там ~200 TVL.
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Ответы (2) |
Цитата: oleg1000 от 31.08.2010 23:14:01
Посмотрите на 11 страницу упомянутого документа.
CTV - Color Television Camera
Теперь название таблицы 1-5 на 43 странице этого документа
CTV scan rates and tolerances
Так что все цифры, заявленные в таблице, относятся к синхрогенератору этой камеры.
Почти 30 (дробное число у меня округлено) кадров в секунду и , соответственно, почти 60 полей в секунду, при почти 15734 строках (горизонтальной развёртки) в секунду.
Чем вам не понравилось разрешение 80% min @200 TV lines (2.5MHz) ?
Цитата
RCA J-Series Ground-Commanded Television Assembly (GCTA)
* Usage: Apollo 15, Apollo 16 and Apollo 17
* Resolution: ~ 200 lines
* Frame rate: 60 frame/s BW / 20 frame/s color (color filters alternated between each field)
* Color: Field-sequential color system camera
* Spectral response: 350–700 nm
* Gamma: 1.0
* Sensitivity: > 32 dB signal to noise ratio
* Dynamic range: > 32:1
* Sensor: Silicon Intensifier Target (SIT) Tube
* Optics: 6x zoom, f/2.2 to f/22
* Automatic light control (ALC): average or peak scene luminance
Because of the failure of the camera on Apollo 12, a new contract was awarded to the RCA Astro division in Hightstown, NJ. The RCA system was a new, more sensitive and durable TV camera tube. The design team was headed by Robert G. Horner. The team used newly developed SIT, and the improved images were obvious to the public.
The system was composed of the Color Television Camera (CTV) and the Television Control Unit (TCU). These were connected to the Lunar Communications Relay Unit (LCRU) when mounted on the Lunar Roving Vehicle (LRV).
Цитата
The RCA Ground Controlled Television Assembly (GCTA) was used on the last three missions of Apollo 15, 16 and 17. It was mainly mounted on the Lunar Rover and remotely controlled via commands sent from Houston. Thus people were able to watch the lunar launch of the LM at the end of the lunar EVAs.
Camera Specifications:
# Frame rate: 60 frame/s BW / 20 frame/s color (color filters alternated between each field)
# Color: Field-sequential color system
# Spectral response: 350–700 nm
# Sensor: Silicon Intensifier Target (SIT) Tube
# Optics: 6x zoom, f/2.2 to f/22
# Automatic light control (ALC): average or peak scene luminance
Цитата: Лунный Гоблин от 01.09.2010 01:05:46
Цитата: http://en.wikipedia.….28GCTA.29
RCA J-Series Ground-Commanded Television Assembly (GCTA)
* Usage: Apollo 15, Apollo 16 and Apollo 17
* Resolution: ~ 200 lines
* Frame rate: 60 frame/s BW / 20 frame/s color (color filters alternated between each field)
* Color: Field-sequential color system camera
* Spectral response: 350–700 nm
* Gamma: 1.0
* Sensitivity: > 32 dB signal to noise ratio
* Dynamic range: > 32:1
* Sensor: Silicon Intensifier Target (SIT) Tube
* Optics: 6x zoom, f/2.2 to f/22
* Automatic light control (ALC): average or peak scene luminance

