Generation of a drive signal for sound transducer

Patent metadata

Field	Value
Publication number	US-8934643-B2
Application number	US-93595509-A
Country	US
Kind code	B2
Filing date	Apr 3, 2009
Priority date	Apr 9, 2008
Publication date	Jan 13, 2015
Grant date	Jan 13, 2015

Abstract

An apparatus for generating a drive signal for a sound transducer ( 109 ) comprises a sound generator ( 101 ) which provides an input audio signal. A divider ( 101 ) divides the input audio signal into at least a low frequency signal and a high frequency signal and an expander ( 105 ) generates an expanded signal by applying a dynamic range expansion to the low frequency signal. A combiner ( 107 ) then generates the drive signal by combining the expanded signal and the higher frequency signal. The threshold for applying the dynamic range extension may be adjusted depending on the amplitude of the low frequency signal. The low frequency signal may furthermore be compressed into a narrow frequency band around a resonance frequency. The approach may allow improved audio quality especially from high Q low frequency sound transducers by attenuating decay parts of bass signals thereby reducing sustain or ringing for bass notes.

First claim

The invention claimed is:

1. An apparatus for generating a drive signal for a sound transducer, the apparatus comprising:
a source for providing an input audio signal;
a divider for dividing the input audio signal into at least a low frequency signal and a high frequency signal;
an expander for generating an expanded signal by applying a dynamic range expansion to the low frequency signal, the expander further for adapting an application of the dynamic range expansion to the l…

Assignees

• Aarts Ronaldus Maria
• Peeters Thomas Pieter Jan
• Koninkl Philips Nv

Inventors

• Aarts Ronaldus Maria
• Peeters Thomas Pieter Jan

Classifications

• H04R1/26

  Electricity · mapped topic

• H04R2430/03

  Electricity · mapped topic

• H04R3/04 Primary

  Electricity · mapped topic