The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 1987
Filed:
Dec. 11, 1985
Timothy H Pearce, Chelmsford, GB;
The General Electric Company plc, London, GB;
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.