Systems and methods for enhancing audio quality of FM receivers

US9130643B2 · 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: Sep 8, 2015
• Expiry date: Nov 28, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/7183
• 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, quadrature L−R demodulation is applied to a composite baseband signal output by an FM demodulator to obtain an L−R noise signal. A channel quality measure is calculated based on the L−R noise signal and is used to control whether a pop suppression technique is applied to an L+R signal obtained from the composite baseband signal to detect and remove noise pulses therefrom. The channel quality measure and the L−R noise signal are also leveraged to perform single-channel noise suppression in the frequency domain on an L−R signal obtained from the composite baseband 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.