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:
Feb. 20, 2001
Filed:
Jan. 14, 2000
Roger Darr, Sugar Hill, GA (US);
Antec Corporation, Duluth, GA (US);
Abstract
A BTSC-compatible encoder that is integrated onto an application specific integrated circuit includes a low pass filter that is responsive to a digital representation of an audio signal that has a sample rate of F,. The low pass filter generates a corresponding second digital signal having an pseudo-interpolated sampling rate of 4F,. A digital infinite impulse response pre-emphasis filter generates a pre-emphasized output signal corresponding to the second digital signal. A digital signal compressor that is responsive to the pre-emphasized output signal, generates a compressed digital signal corresponding to the pre-emphasized output signal. A digital phase locked loop that is responsive to a video sync pulse having a sync pulse frequency, generates a third digital signal corresponding to a sinusoid having a frequency equal to twice the sync pulse frequency and a having a sampling frequency equal to 4F,. A first digital multiplier multiplies the compressed digital signal by the third digital signal, thereby generating a digital BTSC-compatible stereo television difference signal.