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:
Nov. 08, 1994
Filed:
Sep. 07, 1993
Masaaki Ueki, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
Analog audio signals supplied via an analog signal input terminal 1 are translated in parallel via a first .DELTA..SIGMA. modulator 2 and a second .DELTA..SIGMA. modulator 3 into digital audio data which are summed together by an additive node 4. The resulting sum data is attenuated in level by an attenuator 5 and translated by a decimation filter 6 into audio data having a predetermined number of bits and resulting audio data is outputted via an audio data output terminal 7. There is no necessity of providing a decimation filter for each .DELTA..SIGMA. modulator, so that the number of components may be reduced and the circuit may be simplified in construction to lower production costs. Besides, there is no necessity of re-quantizing the audio data at an output stage so that no quantization noise is produced to enable the S/N ratio to be improved by a theoretical value of 3 dB.