Motorola ASTRO SPECTRA Service Manual

6881076C20-E February 3, 2003
Glossary-9
vocoder An electronic device for synthesizing speech by implementing a
compression algorithm particular to voice. See also voice encoder.
vocoder/controller A PC board that contains an ASTRO radio’s microcontroller, DSP,
memory, audio and power functions, and interface support circuitry.
voice encoder The DSP-based system for digitally processing analog signals, and
includes the capabilities of performing voice compression algorithms or
voice encoding. See also vocoder.
voltage-controlled
oscillator
An oscillator in which the frequency of oscillation can be varied by
changing a control voltage.
Term Definition

Motorola ASTRO SPECTRA Specifications

General

Frequency Range	136-174 MHz, 403-470 MHz
Number of Channels	Up to 255
Channel Spacing	12.5 kHz, 20 kHz, 25 kHz
Modulation	FM
Operating Temperature	-22°F to +140°F (-30°C to +60°C)