- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
121
Parameters for setting VCA characteristics for mechanical iris control
The voltage to be output to VCA is set through the following parameters.
The characteristics set through the following parameters are output through EVR1 (IRISVCNT). (See
“Example VCA settings (control range: -12dB to 0dB)”.)
Table 10.6-12 Parameters for setting VCA characteristics for mechanical iris control
Parameter
Description
Settings range
VCAM12(CAT14_Byte21)
EVR value when mechanical iris backlight
compensation is -12dB
0[h]-FF[h]
VCAM6(CAT14_Byte22)
EVR value when mechanical iris backlight
compensation is -6dB
0[h]-FF[h]
VCA0(CAT14_Byte23)
EVR value when mechanical iris backlight
compensation is 0dB
0[h]-FF[h]
VCAP6(CAT14_Byte24)
EVR value when mechanical iris backlight
compensation is 6dB
0[h]-FF[h]
VCAP12(CAT14_Byte25)
EVR value when mechanical iris backlight
compensation is 12dB
0[h]-FF[h]
Fig 10.6-4 Example VCA settings (control range: -12dB to 0dB)
* Note
is an example in which a Rohm BA7655AF is used as the VCA, and a control range of -12dB to
0dB is used when there is backlight. The maximum value is 0dB, with VCA0=VCAP6=VCAP12.
Sony has only evaluated controls (with backlight) in the range of VCA -12dB to 0dB.
VCAM12
VCAM6
VCAP12
VCA0
VCAP6
Parameters for setting VCA characteristics
VCA output gain and
-12dB
0dB
6dB
-6dB
12dB