Methods and apparatus for microphone preamplification

Details Methods and apparatus for microphone preamplification Methods and apparatus for microphone preamplification

H - Electricity

03

F

H03F 3/183 (2006.01) H03F 1/26 (2006.01) H03F 3/187 (2006.01) H04R 3/00 (2006.01)

Patent

CA 2141614

Preamplifying circuitry amplifies sound signals for input into a computer system. A first stage common-emitter amplifier (16) provides high-gain amplification of the input signal, while a second stage amplifier (18) comprising an operational amplifier is suitable for driving a cable with the amplified sound signal. A low-cost constant voltage source (14) comprising a diode (26) and an operational amplifier (21a) supplies a voltage reference to both amplifier stages (16, 18) with a very high rejection of system noise. The circuitry and methods provide a low-cost, easily manufactured preamplifier suitable for sound input in desktop computing devices.

Circuit de préamplification amplifiant des signaux sonores destinés à un système informatique. Un premier étage d'amplificateur à émetteur commun (16) assure une amplification à gain élevé du signal d'entrée, tandis qu'un deuxième étage d'amplificateur (18), comprenant un amplificateur opérationnel, permet d'appliquer à un câble le signal sonore amplifié. Une source de tension constante économique (14) comprenant une diode (26) et un amplificateur opérationnel (21a) transmet une référence de tension aux deux étages d'amplificateur (16, 18) avec élimination poussée du bruit de système. Le circuit et les méthodes associées permettent de créer un préamplificateur économique, facile à fabriquer, adapté pour l'entrée de signaux sonores dans des ordinateurs de bureau.

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