Back to results
US 7,254,242 B2Granted
Acoustic signal processing apparatus and method, and audio device
AssigneeAlpine Electronics, Inc.
InventorsTomohiko Ise, Nozomu Saito
Life of this patent
Estimating the term…
Abstract
A first band analyzer divides an acoustic signal received from a sound playback system through an input unit into frequency bands, and generates a first band level. An acoustic signal estimator estimates the band level of the original acoustic signal at the input unit, and generates a second band level for each band. A processor extracts an external noise component which is contained in the acoustic signal using the first band level and the second band level. The external noise can be accurately estimated with less computation than in the related art.
Claims21
An acoustic signal processing apparatus comprising:
- an audio source for generating an audio signal;
- an audio correction filter for receiving the audio signal and correcting the audio signal to contain a component for canceling an external noise component in a sound playback system;
- a speaker for receiving the corrected audio signal and providing an acoustic signal to the sound playback system;
- a first band analyzer for dividing an acoustic signal received from the sound playback system through an input unit into a plurality of frequency bands and for generating a first band level for each band;
- an acoustic signal estimator for estimating the band level at the input unit of the acoustic signal provided by the speaker and for generating a second band level for each band;
- and
- a processor for extracting the external noise component, which is contained in the acoustic signal received from the sound playback system through the input unit, using the first band level and the second band level;
- wherein the audio correction filter multiplies the audio signal by an audio correction coefficient generated according to the external noise component extracted by the processor.
5 more elements
An audio signal processing method comprising:
- receiving an audio signal;
- correcting the audio signal to contain a component for canceling an external noise component in a sound playback system;
- providing an acoustic signal to the sound playback system using the corrected audio signal;
- dividing an acoustic signal received from the sound playback system through an input unit into a plurality of frequency bands and generating a first band level for each band;
- estimating the band level at the input unit of the acoustic signal provided to the sound playback system and generating a second band level for each band;
- and
- extracting the external noise component, which is contained in the acoustic signal received from the sound playback system through the input unit, using the first band level and the second band levels;
- wherein the act of correcting includes multiplying the audio signal by an audio correction coefficient based on the extracted external noise component.
5 more elements
An audio device comprising:
- an audio source for generating an audio signal;
- a correction unit for receiving the audio signal and correcting the audio signal to contain a component for canceling an external noise component in a sound playback system;
- and
- a speaker for receiving the corrected audio signal and providing an acoustic signal to the sound playback system;
- wherein the correction unit includes:
- a first band analyzer for dividing an acoustic signal received from the sound playback system through an input unit into a plurality of frequency bands and for generating a first band level for each band;
- an acoustic signal estimator for estimating the band level at the input unit of the acoustic signal provided by the speaker and for generating a second band level for each band;
- a processor for extracting the external noise component, which is contained in the acoustic signal received from the sound playback system through the input unit, using the first band level and the second band level;
- and
- a corrector for correcting the audio signal by multiplying the audio signal by an audio correction coefficient generated according to the external noise component extracted by the processor.
7 more elements
Dependencies are inferred from the claim text.