Sound

Digital Delay For Application in Surround Sound

ABSTRACT

Circuits which delay signals are an important feature in many modern systems, particularly in the audio industry.

A number of the techniques used to engulf a listener in sound, such as surround sound for cinema and Hafler surround sound for music reproduction, benefit from delaying the rear speakers in the order of 20 milli-seconds.

The objective of this project was to design and construct a high quality digital delay with sufficient bit resolution and sampling rate so as to be able to process full bandwidth audio signals for such purposes.

Due to early success in the digital delay design, a simple surround sound analogue decoding circuit was constructed. This finally culminated in the building of a fully working basic surround sound processor.

Subjective psychoacoustic tests were conducted on a group of people, from which the results were processed and the overall effectiveness of such a surround sound processor assessed.

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