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. 01, 2000
Filed:
Jan. 05, 1999
Inventec Corporation, Taipei, TW;
Abstract
A method for testing noise of a record/play-back loop in an audio system of a personal computer (PC) system is disclosed. The audio system comprises an analog-to-digital (A/D) converter, an FM synthesizer, an FM register, a mixer, an output device, an input device, and a connection element connected between the output device and the input device. The PC system has a system bus for communicating with the A/D converter and the FM synthesizer. The method comprises the steps of: (a) the PC system is started to issue a command to the FM synthesizer to output a sinusoidal analog signal to the output device via the mixer; (b) the analog signal is outputted to the input device via the connection element and then is outputted to the A/D converter for being converted to a digital signal which further stored as a digitized audio document; (c) the PC system performs a mathematical analysis on the audio document in order to calculate a signal-to-noise (S/N) ratio and a signal distortion of the record/play-back loop; and (d) the S/N ratio and the signal distortion described in step (c) are compared with a pair of predetermined standards respectively in order to determine that whether the S/N ratio and the signal distortion meet the predetermined standards.