Audio Precision ATS-2, Начало работы

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Conceptual Architecture of ATS-2
The functional components implemented in ATS-2 include two audio
signal generators, an audio signal analyzer, digital and analog input and
output modules, and a module for external timebase synchronization.
All signal generation is performed in the digital domain. One of the two
signal generators is dedicated to the digital output. The signal from this
digital generator is buffered and conditioned for the balanced, unbalanced
and optical outputs. The output of the second signal generator is
converted to an analog signal by a digital-to-analog converter (DAC). The
two-channel output of the DAC is conditioned and ranged for the
balanced and unbalanced analog outputs.
All signal analysis is also performed in the digital domain. The digital
input is buffered and directly applied to the analyzer. Analog inputs are first
ranged and conditioned, and then digitized by a high-resolution
analog-to-digital converter (ADC) before being applied to the analyzer. An
optional high-bandwidth ADC is available to increase measurement
bandwidth.
Conceptual Architecture of ATS-2 Chapter 1: General Information
Getting Started with ATS-2 3
Analog Domain vs. Digital Domain
Analog audio signals are electrical analogies of the sound waves
that they represent, varying in frequency and amplitude in a continuous
fashion. In analog audio electronics, these voltages and currents are
manipulated, processed, and measured by modifying their amplitude or
frequency. The term
analog domain refers to signals represented and
processed in this fashion.
Digital audio signals, on the other hand, are numerical
representations of the sound waves. The representation is often carried
on an electrical signal called the interface signal. Digital audio is
processed mathematically in processes gathered together under the
name of
Digital Signal Processing , or DSP . The term digital domain
refers to signals represented and processed in this fashion.