3. Apparatus as in claim 1 which further comprises: a confirmatory output device coupled to said parameter output, to generate a confirmatory indication, recognizable by a said human transaction operator, of values of said parameters thus recognized.
3. Apparatus as in claim 1 which further comprises: a confirmatory output device coupled to said parameter output, to generate a confirmatory indication, recognizable by a said human transaction operator, of values of said parameters thus recognized. 6. Apparatus as in claim 3, in which said confirmatory output device comprises: a speech synthesizer arranged to generate, from said parameter output values, a corresponding synthetic speech signal reciting said values.