Device and method for analyzing an information signal

US8175730B2 · kind B2 · utility

Assignee

• SONY GROUP CORPORATION · JP

Inventors

• Christian Dittmar · Ilmenau, DE
• Christian Uhle · Nuremberg, DE
• Jürgen Herre · Buckenhof, DE

Key dates

• Filing date: Jun 30, 2009
• Grant date: May 8, 2012
• Expiry date: Oct 5, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/48
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

In order to analyze an information signal, a significant short-time spectrum is extracted from the information signal, the means for extracting being configured to extract such short-time spectra which come closer to a specific characteristic than other short-time spectra of the information signal. The short-time spectra extracted are then decomposed into component signals using ICA analysis, a component signal spectrum representing a profile spectrum of a tone source which generates a tone corresponding to the characteristic sought for. From a sequence of short-time spectra of the information signal and from the profile spectra determined, an amplitude envelope is eventually calculated for each profile spectrum, the amplitude envelope indicating how a profile spectrum of a tone source all in all changes over time. The profile spectra and all the amplitude envelopes associated therewith provide a description of the information signal which may be evaluated further, for example for transcription purposes in the case of a music signal.