Vela 2000-0600, Инструкция по установке и эксплуатации

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60 CineCast HD Version 2.6 Installation and User Manual
DECODER Command (45h)
passes a 12-bit signed (two’s complement) value of the gain for both the primary
and secondary outputs. 32-bits of data are used to pass the gain parameter.
• Byte 4 & 5 — Primary Audio Gain
• Byte 6 & 7 — Secondary Audio Gain
Any gain value requested which is outside the valid range will be limited to
0dB to -128dB. Default power-up gain is 0dB, which provides unity gain from
Vela encoders through the CineCast HD decoder.
Bits 8 and 9 of the command determine the analog headroom of 18dB or 20dB.
This only effects the analog outputs and does not affect the digital/embedded
audio. Default is 18dB headroom, matching Vela audio/video encoders.
000C Slow Motion: This commands slows the playback rate. A three-bit field
(bits 8-10 of the command) determines playback speed.
Examples of Actual Gain Parameters
Actual Gain
Gain Parameter
(Gain x 16)
0.0dB 0x000
-2.5dB 0xfd8
-12dB 0xf40
-128dB 0x800
Command Bits Function Name Comments
Bit 8 Primary Headroom 0 = 18dB Headroom
1 = 20dB Headroom
Bit 9 Secondary Headroom 0 = 18dB Headroom
1 = 20dB Headroom
Bits 10–8 Playback Speed
000b Normal rate (each frame is displayed once)
001b Slower rate (each frame is displayed twice)