A-1
Glossary
GLOSSARY
A to D
Analog to Digital. Conversion of an analog signal to a digital representation.
Amplitude factor
See CREST FACTOR.
Attack
The rise of a musical note from zero to full volume.
Attack time
The time required for an applied signal that suddenly increases in amplitude to
reach 1-(1/e), that is, 63.2% of its final, stable value.
Attenuate
To reduce in amplitude.
Attenuation characteristic
The decrease of signal amplitude versus frequency. It is usually expressed in
decibels per octave.
Attenuation constant
See ATTENUATION CHARACTERISITIC.
Attenuator
A device for reducing signal amplitude in precise, predetermined steps, or
smoothly over a continuous range.
Audibility
The quality of being able to be heard. In a healthy listener, the threshold of
audibility is extremely low; at the threshold, the pressure of a sound wave
varies from normal by approximately 10
-4
pascals. The frequency range of
human audibility extends roughly from 20 Hz to 20 kHz.
Audible
Hear or capable of being heard.
Boost
To increase the overall level of a signal.
Clipper
A circuit whose output voltage is fixed at a value for all input-voltages higher
than a predetermined value. Clippers can flat-top the positive, negative, or
both positive and negative peaks of an input voltage.
Clipping
1. Leveling off (flat-topping) a signal peak at a predetermined level. Also see
CLIPPER. 2. In audio practice, the loss of syllables or words because of
cutoff periods in the operation of the circuit (usually caused by overdriving a
stage).
Compress
To reduce the bandwidth or dynamic range of a signal.
Compression
1. The reduction of output signal amplitude as input-signal amplitude rises. 2.
Processing of a signal to increase low-level components and thereby raise the
average power level. Usually a logarithmic function.
Compression ratio
In a system containing compression, the ratio A
1
/A
2
, where A
1
is the gain at a
reference-signal level and A
2
is the gain at a specified higher signal level.
Compressor
A circuit or device which limits the amplitude of its output signal to a
predetermined value in spite of wide variations in input signal amplitude.
Unlike a CLIPPER a compressor does not flat-top output signal peaks.
Crest factor
For an AC wave, the ratio of the peak value to the rms value. The crest factor
of a sine wave is equal to the square root of 2, or 1.4142126.
Summary of Contents for Integrated Signal Processor ISP-100
Page 1: ...User s Manual ISP 100 INTEGRATED SIGNAL PROCESSOR...
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Page 128: ...B 2 10 July 1998 MONDOEQ QMS...
Page 129: ...B 3 Standard QuickMAPs 2X6CMBC QMS...
Page 130: ...B 4 10 July 1998 2X8COMB QMS...
Page 131: ...B 5 Standard QuickMAPs 3X6CMBC QMS...
Page 132: ...B 6 10 July 1998 2X8THRU QMS...
Page 133: ...B 7 Standard QuickMAPs 4CHAN QMS...
Page 134: ...B 8 10 July 1998 4X6CMBC QMS...
Page 135: ...B 9 Standard QuickMAPs 4X6THRU QMS...
Page 136: ...B 10 10 July 1998 3_2W QMS...
Page 137: ...B 11 Standard QuickMAPs 2WAYS QMS...
Page 138: ...B 12 10 July 1998 2_3WAY QMS...
Page 139: ...B 13 Standard QuickMAPs 2_2W_SUB QMS...
Page 140: ...B 14 10 July 1998 2_2W_FR QMS...
Page 141: ...B 15 Standard QuickMAPs 2_2W_2ST QMS...
Page 142: ...B 16 10 July 1998 4_2WAYS QMS...
Page 143: ...B 17 Standard QuickMAPs 4W_2FR QMS...
Page 144: ...B 18 10 July 1998 LCR QMS...
Page 145: ...B 19 Standard QuickMAPs MONO3W QMS...
