Audio processor

Details Audio processor Audio processor

1996-05-01

1998-01-06

Kuntz, Curtis

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

333 14, H03G 700

Patent

active

057063567

ABSTRACT:
An audio processor (10) that is specifically designed to be included in combination with an audio recording system or a movie theater sound system. The processor (10) consists of two major circuits, a single-ended, limited compressor/expander circuit (12) and an output circuit (205) that incorporates a dynamic noise reduction (DNR) circuit (206). A single adjustment sets the trip points for both the low-level and high-level operating mode of the compressor/expander circuit (12). Likewise, a single adjustment sets the bandwidth of the DNR circuit (206). When the processor is in the expand mode, the two circuits (12,206) complement each other such that when the low-level expander lowers the signal level, the source noise is also reduced. The reduced signal results in an earlier activation of the DNR circuit (206) bandwidth control which reduces its bandwidth resulting in a further reduction of the noise level. The audio processor (10) operates to produce a warmer, more natural reproduction of the music while reducing noise levels.

REFERENCES:
patent: 4677645 (1987-06-01), Kaniwa
patent: 4701953 (1987-10-01), White
patent: 5418859 (1995-05-01), Cho
patent: 5586193 (1996-12-01), Ichise et al.
patent: 5633939 (1997-05-01), Kitani et al.

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