Instruction manual

Adjusting and Verifying Audio with DSP
20
Instruction Manual – BCS Basic Control Structure Protocol
Adjusting and Verifying Audio with DSP
This chapter covers information unique to products with Digital Signal Processing (DSP) functionality.
For information on general audio functions, see “Adjusting and Verifying Audio” on page 12.
AMX AutoPatch products with DSP use BCS commands to make volume adjustments at anytime during
normal operation. Balance and tone can also be adjusted at any time using BCS commands.
Equalization bands (see page 22) and digital input gain (see page 16) should be adjusted during system
setup.
Caution: We strongly recommend that input gain adjustments be made only by a qualified installer
or dealer.
If adjusting input gain, we recommend doing so before making any output adjustments.
General Audio Rules for Products with DSP
Volume is adjusted using any of the following three methods:
Absolute – adjusts volume to a specific decibel level (see page 13).
Relative – increases or decreases volume by a specific decibel amount (see page 13).
Increment/Decrement – increases or decreases volume a step (see page 14).
An output does not need to be routed to adjust the volume; however, it may be helpful to hear
the adjustment. This also applies to adjusting input gain.
Enter decibel levels as integer numbers representing the desired decibel value multiplied
by 10. For example, +5 dB is entered as 50 and -60.5 dB is entered as -605. (Interpret volume
status results in the same way.)
Do not use leading zeros for gain values in audio commands.
If the requested volume change results in a decibel level outside the valid range for that
particular audio component, the system responds with an “X”.
When a muted output is un-muted, the output returns to its previously un-muted volume.
When an output volume command is sent to a muted output, the output is un-muted and then
the volume adjustment is applied.
Inputs cannot be muted.
When an input gain command is sent to an input connected to a muted output, the gain is
applied to the input and the output remains muted.
To cancel an incorrect or incomplete command, enter “X”.
Important: If the level is not specified in a BCS command, the command is executed on the default
level (normally Level 0), which is defined in the configuration file. If the level is omitted and the
BCS command executes on an unexpected level, check the default level in the configuration file
(for systems without a configuration file, check the product documentation).