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Amps, Pre-amps, Pre-pre-amps Read chapter Read first chapter

2011 | OriginalPaper | Chapter

22. Measurement Amps, Noise Generators and FFT Noise Measurements

Author : Dipl.-Ing. Burkhard Vogel

Published in: The Sound of Silence

Publisher: Springer Berlin Heidelberg

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Abstract

In 1989 M. Wilfried Adam published a great article on the design of low-noise audio amps. The complete circuitry of a noise measurement system (MS) also became part of that article. M. Adam described all necessary measurement filters too. Instead of buying a very expensive all-in-one measurement instrument a few months later I decided to develop my own measurement equipment, mainly based on M Adam’s ideas, but with much less noisy op-amps and some improvements, of course.

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previous chapter System Overview
next chapter Measurement Filters and Networks
Footnotes
1
“Designing low-noise audio amplifier”, Wilfried Adam, EW 06-1989.
 
2
Relays are Matsushita TQ2-12V.
 
3
Linear Technology data sheet in the 1990 Databook.
 
4
“Special Linear Reference Manual” Analog Devices 1992.
 
5
Details see next section.
 
6
“Audio Measurement Handbook”, 1993, Bob Metzler, Audio Precision, Inc.
 
7
Audio Precision’s monthly notes: “Audio.TST”, October 2009.
 
8
© stereoplay, by kind permission of stereoplay and TESTfactory, WEKA Media Publishing GmbH, Stuttgart, Germany.
 
9
Grundwelle (Rest) means: rest of fundamental frequency = 1 kHz.
 
10
See Chap.​ 23 for more details.
 
11
q = quasi-peak, p = ponderé = weighted, 0s = reference sound-programme level, in this case 0 dBV.
 
12
“Minimum” and “maximum” because of the uncertainty on the quotient of FS/fS in (22.7).
 
13
Detailed explanations are given in Chaps.​ 24–26.
 
14
Consequently, a (hum-free) power amp with a typical gain of 30 feeds the loudspeaker with a 50 Hz signal of −64.5 dBV. Assuming equal mains supply for both amps (= 100% correlated mains frequency) any additional power amp hum will be added too. What this means for the sideband creation of low-frequency signals can be studied at the beginning of Chap.​ 25.
 
Metadata
Title
Measurement Amps, Noise Generators and FFT Noise Measurements
Author
Dipl.-Ing. Burkhard Vogel
Copyright Year
2011
Publisher
Springer Berlin Heidelberg
Book
The Sound of Silence

Print ISBN: 978-3-642-19773-4

Electronic ISBN: 978-3-642-19774-1

Copyright Year: 2011

DOI
https://doi.org/10.1007/978-3-642-19774-1_22