Lambda SR1, Руководство по эксплуатации, Страница: 73 / 317

SR1 Operation 73
© 2014 Stanford Research Systems
Special Digital Test Waveforms
SR1's digital audio generator includes several waveforms that are specific to the digital audio domain, i.e.
they have no analog counterparts. These waveforms generate specific bit patterns in the embedded
digital audio output signal. As such, they cannot be combined with other signals. Dither is not added to
the special digital test waveforms.
Digital Constant*
The digital constant outputs a fixed bit pattern to the audio data portion of each digital output sample.
The constant can be specified as a hex word, or in any of the standard digital generator amplitude units.
The polarity of the constant can be controlled with the radio buttons at the bottom of the panel.
Digital Count*
The Digital Count waveform implements a counter which operates between two user specified values.
The generator outputs each value for the number of samples specified in the "Samples/Point" control
before incrementing the value by one. When the final value has been output for "Samples/Point"
samples, the counter output resets to the initial value.
Rotate Bits
The Rotating Bits waveform outputs a pattern composed of all zeros and a single "one" (if "Ones" is
selected), or all ones and a single "zero" (if "Zeros" is selected). The pattern is output for the number of