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Acoustical Parameters (cont.) - PCM Scale Settings
As introduced on page 36, the term PCM (Pulse Code Modulation) typically refers to the
digital stereo audio channels (PCM Stereo) on laser discs and CDs. The term PCM Scale
refers to the relative volume level based on a scale from 0-255. The standard PCM Scale
setting is "127". This represents the highest volume level which can be set using the PCM
Scale as a volume contour control. Thus using "127" as the high point, volume will decrease
as you either lower or increase the PCM Scale from the center "high point" value of 127.
Please note, that when using the PCM Scale as a volume control, the reduction of volume
level, as you increase or decrease from "127", is a result of the processor skipping bits. Since
bits represent audio information, PCM Scale settings other than "127", will also result in some
data loss. The PCM Scale can be individually set per Input Label. Thus, source input levels
can be individually adjusted using the PCM Scale. This may result in a loss of information and
should only be used if volume level balancing per input is absolutely essential.
The SSD-66 (5.1) will arrive with all Input Labels set to the standard PCM Scale factor of
"127". To alter the PCM Scale for each Input Label follow these steps.
Step 1 Repeatedly press the INPUT SELECT button until the Input Label you wish to ad-
just appears in the SSD-66 (5.1)'s display.
Step 2 Repeatedly press the SETUP MODE button until the words "PCM SCALE" appear.
Once "PCM SCALE" appears, the display will change and read the current PCM
Scale for this Input Label, typically "127".
Step 3 Use the VOL UP or VOL DN buttons to alter the PCM Scale for this Input Label.
Please note, that the volume level will lower as you reduce or increase the PCM
setting away from "127", the highest output level available.
Step 4 Once a desired setting is reached, press the INPUT SELECT button to exit the
program mode.
Step 5 Repeat Steps 1-4 for all additional Input Labels for which you wish to alter the PCM
Scale settings.
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