Audio system

• US 7,054,455 B2
• Filed: 08/12/2004
• Issued: 05/30/2006
• Est. Priority Date: 05/05/1997
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Aarts, Ronaldus M.
• Primary Examiner(s): NGUYEN, DUC MINH
• Application Number:
  US10/917,051
• Publication Number:
  US 20050013446A1
• Time in Patent Office: 656 Days
• Field of Search: 381 98-109, 381 61- 63
• US Class Current: 381/98
• CPC Class Codes: H04R 3/04 for correcting frequency response
• CPC Class Codes: H04S 1/00 Two-channel systems H04S5/00, H04S7/00 take precedence

Abstract

An audio system includes a circuit (12) for processing an audio signal, which circuit (12) having an input (20) for receiving the audio signal and an output (26) for supplying an output signal. The circuit (12) further includes a harmonics generator (22) coupled to the input (20) for generating harmonics of the audio signal and an adding circuit (24) coupled to the input (20) as well as to the harmonics generator (22) for supplying a sum of the audio signal and the generated harmonics to the output (26). The harmonics generator (22) includes an integrator (34) for integrating the audio signal and, coupled thereto, a resetting circuit (36) for resetting the integrator (34) at resetting times.

Claims

1. An audio system comprising a circuit for processing an audio signal, said audio signal processing circuit comprising:

an input for receiving the audio signal and an output for supplying an output signal;

filtering means coupled to said input for passing low-frequency components of said audio signal to form a filtered audio signal;

a harmonics generator coupled to the filtering means for generating harmonics of the filtered audio signal; and

adding means coupled to the input as well as to the harmonics generator for supplying a sum of the audio signal and the generated harmonics to the output, characterized in that the harmonics generator comprises;

an input for receiving the filtered audio signal;

an integrator coupled to the input for integrating the filtered audio signal, said integrator comprising means for limiting an amplitude of the integrated signal, and said integrator adapting an integration time-constant in dependence on a frequency of the integrated signal; and

resetting means coupled to the integrator for resetting the integrator at resetting times.

2. The audio system as claimed in claim 1, characterized in that the integrator stops the integration in dependence on an amplitude of the integrated signal.