Filter compressor and method for manufacturing compressed subband filter impulse responses

US8255212B2 · kind B2 · utility

Assignee

• Dolby International AB · IE

Inventor

• Lars Villemoes · Stockholm, SE

Key dates

• Filing date: Jul 3, 2007
• Grant date: Aug 28, 2012
• Expiry date: Mar 23, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/0204
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A filter compressor for generating compressed subband filter impulse responses from input subband filter impulse responses corresponding to subbands, which include filter impulse response values at filter taps, includes a processor for examining the filter impulse response values from at least two input subband filter input responses to find filter impulse response values having higher values and at least one filter impulse response value having a value being lower than the higher values, and a filter impulse response constructor for constructing the compressed subband filter impulse responses using the filter impulse response values having the higher values, wherein the compressed subband filter impulse responses do not include filter impulse response values corresponding to filter taps of the at least one filter impulse response value having the lower value or include zero-valued values corresponding to filter taps of the at least one filter impulse response value having the lower value.