Method for testing noise of a record/play-back loop in a compute

Details Method for testing noise of a record/play-back loop in a compute Method for testing noise of a record/play-back loop in a compute

1999-01-05

2000-08-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

381 56, 700 94, H04R 2900

Patent

active

060978198

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.

REFERENCES:
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patent: 5553220 (1996-09-01), Keene
patent: 5555311 (1996-09-01), Reams
patent: 5832438 (1998-11-01), Bauer
patent: 5915029 (1999-06-01), Yazurlo et al.

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