Low-latency audio output with variable group delay

US10701486B1 · kind B1 · utility

Assignee

• CIRRUS LOGIC, INC. · US

Inventors

• John L. Melanson · Austin, US
• Xiaofan Fei · Austin, US
• Lei Zhu · Beijing, CN
• Xin Zhao · Austin, US
• Wei-Shun Shum · Austin, US
• Leyi Yin · Austin, US
• Ku He · Austin, US
• Johann G. Gaboriau · Austin, US

Key dates

• Filing date: Jul 25, 2019
• Grant date: Jun 30, 2020
• Expiry date: Jul 25, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S2400/09
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A system may include a filter configured to receive a digital audio input signal quantized at between two and 257 quantization levels and sampled at at least 500 kilohertz, the filter further configured to perform filtering on the digital audio input signal to generate a filtered digital audio input signal, the filter having a selectable variable group delay, a digital-to-analog converter configured to receive the filtered digital audio input signal and convert the filtered digital audio input signal into an equivalent analog audio input signal, and a driver configured to receive the equivalent analog audio input signal and drive an analog audio output signal to a transducer.