SDRadio is only a subset of the above definition, dealing only with the receiver part, and the ADC is not exactly wideband, but it is what is offered by the majority of today's sound cards, i.e. either 48 or 96 kHz. Nevertheless it can be considered as a first step in that direction.
A software radio is a radio whose channel modulation waveforms are defined in software. That is, waveforms are generated as sampled digital signals, converted from digital to analog via a wideband DAC and then possibly upconverted from IF to RF. The receiver, similarly, employs a wideband Analog to Digital Converter (ADC) that captures all of the channels of the software radio node. The receiver then extracts, downconverts and demodulates the channel waveform using software on a general purpose processor
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