Digital synthesizer for analog signal, has analog summer for algebraic combination of analog outputs of digital/analog converter to provide analog output signal, which is free from white noise

摘要

The synthesizer has a digital/analog-converting device (3) comprising a noise generator (35) for white noise (BB) at a level, which is greater than that of digital versions of a desired signal. Digital/analog converters (31, 32) combine an adder (36) and a subtractor (37) of white noise with the digital version of the desired signal. An analog summer (39) is provided for algebraic combination of analog outputs of the digital/analog converter to provide an analog output signal (2 SINA), which is free from white noise.