User`s guide

Glossary
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ProMix 01 User’s Guide
Peaking — A type of EQ circuit used to cut and boost a band of fre-
quencies. It produces a mountain-peak type response curve. The
width of the frequency band is controlled by the Q parameter. Mid-
band EQ is usually of the peaking type. Compare with Shelving.
PCM — An abbreviation for Pulse Code Modulation. In the second
part of the A/D conversion, the pulses derived using PAM are con-
verted into binary data words using PCM. See also PAM.
Q — The unit used to measure an EQ circuit’s selectivity. For high
values the frequency band is narrow. For low values, it is wide.
ProMix 01 Q is stated in musically intuitive octaves.
Quantization — The PCM process where PAM pulses are approx-
imated to the nearest binary value available. In the ProMix 01 20-bit
system, pulses can be approximated to any one of 1,048,576 binary
values. That’s four times more than a 16-bit CD system. These
approximations can result in quantization errors (i.e. noise). How-
ever, this is reduced by oversampling, as featured on ProMix 01.
Pink noise — A type of random noise that contains an equal amount
of energy per octave . The bands 100–200, 800–1600, and 3000–6000
all contain the same amount of energy. White noise, on the other
hand, has an equal amount of energy per frequency band . That is,
100–200, 800–900, and 3000–3100.
Program Change — A type of MIDI message that is used to recall
programs and patches. On the ProMix 01 they recall mix scenes.
RAM (Random Access Read & Write Memory) — A type of
memory chip that stores data that can be edited, but requires a con-
tinuous electrical charge. ProMix 01 mix settings and mix scenes are
stored in RAM. An internal backup battery provides the continuous
charge. Contrast with ROM.
Register mode — The mode in which all MIDI Control Change
messages used to control ProMix 01 parameters are transmitted on
the same MIDI channel and MIDI Control Change 98 (Non Regis-
tered Parameter LSB) is used to identify banks.
ROM (Read Only Memory) — A type of memory chip that stores
data that cannot be edited, but does not require a continuous electri-
cal charge. The ProMix 01 operating system is stored in ROM. Con-
trast with RAM.
Sampling frequency — The number of times per second that an
analog audio signal is sampled (measured) during A/D conversion.
The value of each sample is stored as a data word. Once in the digital
domain, the data usually remains at the same sampling frequency
until final D/A conversion.
Scene memory — A ProMix 01 memory location used to store a
mix scene. See also Mix scene.