Audio converting device and converting method thereof

Details Audio converting device and converting method thereof Audio converting device and converting method thereof

2007-02-20

2007-02-20

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

C381S094100

Reexamination Certificate

active

10103303

ABSTRACT:
An audio converting device including a digital high-pass filter, an expander, a digital low-pass filter, a delta-sigma modulator, a digital-to-analog converter, an analog low-pass filter and a gain control unit is provided. The digital high-pass filter in this invention can filter out a direct-current component of digital audio data such that the production of noise is avoided when the volume is adjusted by users.

REFERENCES:
patent: 5027410 (1991-06-01), Williamson et al.
patent: 5065433 (1991-11-01), Ida et al.
patent: 5896291 (1999-04-01), Hewitt et al.
patent: 6044307 (2000-03-01), Kamiya

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