Apparatus for reproducing sound with a reduced dynamic range

Details Apparatus for reproducing sound with a reduced dynamic range Apparatus for reproducing sound with a reduced dynamic range

1994-03-30

1997-03-18

Kuntz, Curtis

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With magnetic loudspeaker

381111, 381106, 330 10, 330251, H04R 300

Patent

active

056130104

ABSTRACT:
An open-loop speaker amplifier and a dynamic range reduction circuit are disclosed. The speaker amplifier includes a bridge driver and a bridge circuit. The bridge circuit includes a first set of switches and a second set of switches. When the first set of switches are activated, a positive current flows through a speaker load. When the second set of switches are activated, a negative current flows through the speaker load. The bridge driver generates a pulse width modulated signal and a delayed pulse width modulated signal to drive the first and second set of switches of the bridge circuit responsive to a modulation signal. The modulation signal maybe for example, a plurality of pulse code modulated samples representing sound. The dynamic range reduction circuit modifies a selected signal to reduce the dynamic range of the sound reproduced based on the modulation signal. The selected signal is either the modulation signal or a reference signal. In one embodiment, the dynamic range reduction circuit modifies the selected signal by processing the selected signal based on a smooth saturating function. In another embodiment, the dynamic range reduction circuit modifies the amplitude of the reference signal based on an envelope size of the modulation signal.

REFERENCES:
patent: 4649565 (1987-03-01), Kaizer et al.
patent: 4773096 (1988-09-01), Kirn
patent: 4783659 (1988-11-01), Frick
patent: 4947133 (1990-08-01), Thomas
patent: 5014016 (1991-05-01), Anderson
patent: 5077539 (1991-12-01), Howatt
patent: 5309478 (1994-05-01), Lim
patent: 5343161 (1994-08-01), Tokumo et al.
patent: 5347587 (1994-09-01), Takahashi et al.
patent: 5398003 (1995-03-01), Heyl et al.

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