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:
Aug. 16, 1994
Filed:
Mar. 30, 1992
Robert C Ledzius, Austin, TX (US);
James S Irwin, Paige, TX (US);
Dhirajlal N Manvar, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A flexible data interface (21, 22) for a digital-to-analog converter (25, 26) includes a mute circuit (46, 70, 71 ) to mute and de-mute input data in 6 dB steps over a time period such as one-quarter of a second. The mute circuit includes a counter (46) to provide mute signals, a decoder (70) to decode the mute signals, and a shift matrix (71) to shift the data from zero to the maximum number of bits in response to the decoded signals. The interface (21, 22) includes a programmable shift register (43) to allow different data word lengths, such as 20-, 18-, or 16-bit, to be presented to the digital-to-analog converter (25, 26). The interface (21, 22) also includes a multiplexer (47) to allow left- and right-channel data to be received either time-multiplexed on a single pin, or on two separate pins.