CHAPTER 7

Noise Reduction

 

CHAPTER CONTENTS

Why is Noise Reduction Required?

Methods of Reducing Noise

Variable pre-emphasis

Dolby noise reduction systems

dbx

Telcom c4

Line-Up of Noise Reduction Systems

Single-Ended Noise Reduction

General systems

Noise gates

Digital noise extraction

 

Much of the material contained in this chapter could be regarded as historical given the widespread adoption of digital recording and processing, but the justification given at the beginning of the last chapter for its continued inclusion requires that its partnering chapter, also in reduced form, should hold a place in this edition. Noise reduction techniques have been applied to analog tape machines of all formats, radio microphones, radio transmission ...

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