Systems and methods for enhancing audio quality of FM receivers

US9178553B2 · kind B2 · utility

Assignee

• Broadcom Corporation · US

Inventors

• Juin-Hwey Chen · Neshanic Station, US
• Thomas Baker · San Diego, US
• Evan McCarthy · Brooks Road, US
• Jes Thyssen · Laguna Niguel, US
• Walter James Wihardja · Tustin, US
• David Garrett · Sydney, AU

Key dates

• Filing date: Jan 31, 2012
• Grant date: Nov 3, 2015
• Expiry date: Dec 5, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S2400/09
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Systems and methods are described for enhancing the audio quality of an FM receiver. In embodiments described herein, a stop band noise signal is extracted from an L+R or L−R signal produced by an FM stereo decoder. A channel quality measure is calculated based on the stop band noise signal and is used to control whether a pop suppression technique is applied to the L+R signal. The channel quality measure and the stop band noise signal are also leveraged to perform single-channel noise suppression in the frequency domain on the L−R signal and on the L+R signal. The channel quality measure is also used to control the application of a fast fading compensation process that replaces noisy segments of the L−R and L+R signal with replacement waveforms generated via waveform extrapolation.