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Chapter 11, Block Diagrams
Section Details
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Audio Generator
Section
Waveform Generation
The A15 Signal Source and Analyzer gets frequency and waveshape information
from the A16 Host Controller. Waveform values are calculated real-time by a
digital waveform synthesis IC. The AFGen1 output is always a sine-wave. The
AFGen2 output is a sine-wave unless one of the signaling encoder functions is
selected from the front panel.
Signaling tones and sequences are generated by AFGen2. This consists of a read-
only-memory (ROM) IC that contains the program code for enabling the digital
waveform synthesis IC to generate signaling. This ROM is on the A15 assembly.
Level Control
Audio level is controlled by the A34 Modulation Distribution assembly by using a
DAC and variable attenuators. The leveled audio signal is passed on to the RF
Generator section.
Summary of Contents for 8924E
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