Amplifiers – With amplifier condition indicating or testing means
Patent
1995-06-21
1997-05-13
Mullins, James B.
Amplifiers
With amplifier condition indicating or testing means
324613, H03F 2100, G01R 2926
Patent
active
056296479
ABSTRACT:
A method and device for measuring the switching noise of an audio amplifier by measuring the energy of the noise signal at the output of the audio amplifier as the amplifier is switched from one operating condition to another by a control signal, and after first weighing the energy according to the frequency and volume sensitivity of the human ear. The device comprises a control signal generator; an audio band filter connected to the output of the audio amplifier; a meter for measuring the power of the filtered signal; and an integrating element for calculating the energy of the filtered signal.
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European Search Report from European Patent Application No. 94830302.9, filed Jun. 22, 1994.
Database WPI, Week 9015, Derwent Publications Ltd., London, GB; AN 90-110076 & JP-A-2 058 907 NEC Feb. 28, 1990.
Radio Fernsehen Elektronik, vol. 26, No. 6, 1977, pp. 182-186 Frommhold, "Neuer Messplatz".
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Avenia Giovanni
Fassina Andrea
Pagani Elia
Driscoll David M.
Morris James H.
Mullins James B.
SGS--Thomson Microelectronics S.r.l.
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