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AC-3 Status Feedback
The SSD-66 (5.1) is unique among AC-3 processors. Not only can it read information from an
AC-3 data bit stream to self adjust its output, but it can also display information coming off the
AC-3 source material. This includes full feedback of AC-3 status. To read the information
coming into the SSD-66 (5.1) from an AC-3 source material:
Step 1 Make certain that an AC-3 source is in play. When using the RFD-1 RF Demodula-
tor, make certain that the green LED "Lock" indicator is "on".
Step 2 Press the INPUT SELECT button until you are on an AC-3 Input Label.
Step 3 Press the pause button on your laser disc or other AC-3 source component.
Step 4 Repeatedly press the SETUP MODE button until the display reads "AC-3 STA-
TUS". These words will display for only a brief moment and then the display will
change to read "AC-3 DST=#", where the "#" will range from "0-5". "0" refers to no
errors detected. "1" informs you that the last output block was repeated. "2" in-
forms you that since the input status was non-"0" the output was muted. All these
functions indicate the decoders status. This is true since the AC-3 source is in
pause.
Step 5 Press play on your laser disc or other AC-3 source component.
Step 6 Press the SETUP MODE button again. The display reads "AC-3 STATUS" fol-
lowed by "AC-3 DST=0" inferring that no errors are detected.
Step 7 Press the VOL UP button and the display will read "AC-3 IST=0" which refers to
AC-3 frame information. "0" refers to no errors, "1" indicates an invalid frame sync,
"2" indicates an invalid sample rate, and "3" indicates an invalid data rate.
Step 8 Press the VOL UP button and the display will read "SR = ## KHZ", where the "##"
refers to the sample rate in KHz which would normally be 48KHz, 44.1KHz, or
32KHz.
Step 9 Press the VOL UP button and the display will read "IDR=### KB/S", the "###"
refers to the Input Data Rate. The range for the Input Data Rate is from 32, 40, 48,
56, 64, 80, 86, 112, 128, 160, 192, 224, 256, 320, 384, 448, 512, 576, and 640 Kilo-
Bytes per second. For normal laser discs, the Input Data Rate is going to be 384
KB/s.
Step 10 Press the VOL UP button and the display will read "DW = YES" or "DW = NO". This
refers to Extra Word Packed which will most likely be used for future AC-3 material
sampled only at the 44.1KHz data rate.
Step 11 Press the VOL UP button and the display will read "LFE CHAN = YES" or "LFE
CHAN = NO", which refers to the source material containing the Low Frequency
Effects channel. This is the ".1" in the phrase "5.1". When the display reads "LFE
CHAN = NO", you will need to gather bass information from the other audio chan-
nels which is normally the way the SSD-66 (5.1) is set.
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