Electroacoustical transducing with low frequency augmenting devices

• US 8,238,578 B2
• Filed: 01/08/2010
• Issued: 08/07/2012
• Est. Priority Date: 12/03/2002
• Status: Expired due to Term

• Current Assignee: Bose Corporation
• Original Assignee: Bose Corporation
• Inventors: Aylward, J. Richard
• Primary Examiner(s): FAULK, DEVONA E
• Application Number:
  US12/684,346
• Publication Number:
  US 20100119081A1
• Time in Patent Office: 942 Days
• Field of Search: 381/97, 381102-109, 381/94.8
• US Class Current: 381/102
• CPC Class Codes: A63F 2300/6063 for sound processing
• CPC Class Codes: H03G 5/165 Equalizers; Volume or gain control in limited frequency bands
• CPC Class Codes: H04R 1/24 Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
• CPC Class Codes: H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges
• CPC Class Codes: H04R 1/2819 for loudspeaker transducers
• CPC Class Codes: H04R 1/2857 for loudspeaker transducers
• CPC Class Codes: H04R 2205/022 Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
• CPC Class Codes: H04R 2205/024 Positioning of loudspeaker enclosures for spatial sound reproduction
• CPC Class Codes: H04R 2499/13 Acoustic transducers and sound field adaptation in vehicles
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers
• CPC Class Codes: H04R 9/063 using a plurality of acoustic drivers H04R1/24 and H04R1/403 take precedence
• CPC Class Codes: H04S 1/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30
• CPC Class Codes: H04S 2420/01 Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
• CPC Class Codes: H04S 3/00 Systems employing more than two channels, e.g. quadraphonic H04S5/00, H04S7/00 take precedence
• CPC Class Codes: H04S 3/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30

Abstract

A method for clipping and post-clipping processing an audio signal, includes clipping an audio signal to provide a clipped audio signal; filtering, by a first filter, the audio signal to provide a filtered unclipped audio signal; and filtering, by a second filter, the clipped audio signal to provide a filtered clipped audio signal. The method further includes differentially combining the filtered clipped audio signal and the clipped audio signal to provide a differentially combined audio signal; and combining the filtered unclipped audio signal and the differentially combined audio signal to provide an output signal.

Claims

1. A method for clipping and post-clipping processing an audio signal, comprising:

clipping an audio signal to provide a clipped audio signal;

filtering, by a first filter, said audio signal to provide a filtered unclipped audio signal;

filtering, by a second filter, said clipped audio signal to provide a filtered clipped audio signal;

differentially combining said filtered clipped audio signal and said clipped audio signal to provide a differentially combined audio signal; and

combining said filtered unclipped audio signal and said differentially combined audio signal to provide an output signal.

2. A method for clipping an audio signal in accordance with claim 1, wherein said first filter is a notch filter.

3. A method for clipping an audio signal in accordance with claim 2, wherein said second filter is a notch filter.

4. A method for clipping an audio signal in accordance with claim 3 wherein said first filter and said second filter have substantially the same notch frequency.