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Shown in the figure is a programmable digital sinewave synthesizer whic produces a slope-encoded waveform.
English (United States)
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Programmable Digital Frequency Synthesizer
Shown in the figure is a programmable digital sinewave synthesizer whic
produces a slope-encoded waveform.
The synthesizer comprises a variable length counter (VLC) which counts
clock pulses from a clock source and periodically outputs pulses to an up-down
counter (UDC). The period of the VLC is controlled by a slope number described
by a binary word outputted from a read-only memory (ROM). The count states
from the UDC are applied to a digital-to-analog converter (DAC) whose output
produces the synthesized wave-for The N most significant bits of the count state
from counter UDC are inputted to the ROM, 2/N/ representing the number of
segments used to synthesize half a sinewave. The carry output from counter
UDC drives a flip-flop which selectively controls up or down counting.
In operation, starting at point A of the waveform, the count state from the
UDC is zero, and its N most significant bits are inputted to the ROM which
converts them into a slope number which is representative of the slope of the
sinewave to be synthesized, at point A. This slope number sets the length, or
period, of the VLC. As clock pulses are fed to the VLC, the DAC output produces
segment 1. When the DAC output signal reaches point B, the value of one of the
N most significant bits changes and the ROM provides the slope number which is
representative of to the VLC, the DAC output produces segment 1. When the
DAC output signal reaches point B, t...