Sony HDCAM HDW-F900R Maintenance Manual page 80

Audio DSP Operation Processing
. DIGITAL AGC Processing
Three to five types of characteristics can be selected from
the menu depending on the headroom.
* MAINTENANCE menu AUDIO-2 page "AU AGC
SPEC ": _6dB/_9dB/_12dB/_15dB/_17dB
_6dB: Linear operation until approx. _8dBFS. Approx.
_6dBFS at Max.
_9dB: Linear operation until approx. _11dBFS. Approx.
_9dBFS at Max.
_12dB: Linear operation until approx. _14dBFS. Approx.
_12dBFS at Max.
_15dB: Linear operation until approx. _17dBFS. Approx.
_15dBFS at Max.
_17dB: Linear operation until approx. _20dBFS. Approx.
_17dBFS at Max.
0
AGC max. -6dBFS (CLIP 0dBFS)
-4
-8
AGC max.-9dBFS (CLIP 0dBFS)
-12
-16
-20
AGC max. -12dBFS (CLIP -2dBFS)
-24
AGC max. -15dBFS (CLIP -5dBFS)
-28
-1 4
LINE INPUT LEVEL [dBu]
Fig.3 AGC features (Headroom 20dB)
. DIGITAL INPUT LIMITER characteristics (only during
manual control)
Turn the LIMITER ON/OFF from the menu. Three to five
types of characteristics can be selected from the menu
depending on the headroom.
* MAINTENANCE menu AUDIO-2 page "AU LIMITER
MODE": OFF/_6dB/_9dB/_12dB/_15dB/_17dB
OFF: LIMITER OFF
_6dB: Linear operation until approx. _8dBFS. Approx.
_6dBFS at Max.
_9dB: Linear operation until approx. _11dBFS. Approx.
_9dBFS at Max.
_12dB: Linear operation until approx. _14dBFS. Approx.
_12dBFS at Max.
_15dB: Linear operation until approx. _17dBFS. Approx.
_15dBFS at Max.
1-70
HEADROOM 20dB
AGC OFF
AGC max. -17dBFS (CLIP -7dBFS)
9 14 19 24
_17dB: Linear operation until approx. _20dBFS. Approx.
_17dBFS at Max.
. DIGITAL OUTPUT LIMITER characteristics
Performs LIMITER processing on the EE and PB output
signal. Turn the LIMITER ON/OFF from the menu.
* MAINTENANCE menu AUDIO-2 page "AU OUT
LIMITER": ON/OFF
Linear until approx. _13dBFS. Approx. _11dBFS
ON:
at Max.
OFF: LIMITER OFF
. Gain control during manual control
The A/D converted volume value is converted into a DSP
multiplication value at FP CPU (IC816) and handed over
to DSP. The maximum variable for volume is approx.
+12dB. (_∞ to +12 dB)
. Recording error correction
For error correction on the A/D converter for audio, the
multiplication value is corrected in the range +0 to _2dB.
Adjustment is carried out from the menu with the standard
signal level applied. (fully automatic)
. Playback error correction
For error correction on the D/A converter for audio, the
multiplication value is corrected in the range +0 to _2dB.
During adjustment, internal SG is used as the standard
signal, and the inside panel for each LEVEL volume is
turned and fine-tuned. (semi-automatic)
. LPF
Runs automatically during front microphone selection.
. Internal SG
Generates a _20dBFS (1kHz) fixed level signal and later
adjusts the gain depending on the SG level settings in the
menu.
. EMPHASIS, DE-EMPHASIS
Performs recording EMPHASIS processing depending on the
menu settings. Also performs playback DE-EMPHASIS
processing.
. Headroom level switch
Performs headroom level switch during recording and
playback depending on the menu settings.
. Delay processing
Performs delay processing to match the VIDEO and
AUDIO phases of each CH.
HDW-F900R/V1 (E)