Apparatus for converting an analogue input signal of narrow band

Details Apparatus for converting an analogue input signal of narrow band Apparatus for converting an analogue input signal of narrow band

1985-12-11

1987-03-17

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

375 27, H03M 120

Patent

active

046511318

ABSTRACT:
A narrow band signal is converted into digital form using an analogue to digital converter of relatively small capacity. The input signal is compared with a prediction of it based on previous cycles of the incoming waveform. This produces an error signal which is compared with a prediction of the error signal to produce an "error of the error" signal. A relatively small A/D converter converts this into 8 bit digital form and this is applied to a feedback loop consisting of an adder and delay to give a sixteen bit prediction of the error signal which is applied via D/A converter to the subtractor. The sixteen bit prediction also provides an input to a further adder forming part of a feedback loop to give an eighteen bit prediction of the input signal. The latter is applied via a D/A converter to a subtractor and is used as the system output.

REFERENCES:
patent: 4059800 (1977-11-01), Jones
patent: 4179659 (1979-12-01), Tashiro
patent: 4204198 (1980-05-01), Filipov
patent: 4271431 (1980-06-01), Steber
patent: 4532494 (1985-07-01), Sasaki

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