Filter Circuit

SECOND_ORDER___HIGH_PASS_ACTIVE_FILTER___

Published:2009/6/30 2:07:00 Author:May

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HIGH_PASS_FILTER（HIGH_FREQUENCY）

Published:2009/6/30 2:04:00 Author:May

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HIGH_PASS_ACTIVE_FILTER

Published:2009/6/30 2:03:00 Author:May

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01_Hz_TO_10_Hz_BANDPASS_FILTER

Published:2009/6/30 2:03:00 Author:May

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SPEECH_FILTER（300_Hz3_kHz_BANDPASS）

Published:2009/6/30 2:02:00 Author:May

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POLE_ACTIVE_LOW_PASS_FILTER（B_UTTERWORTH_MAXIMALLY_FLAT_RESPONSE）

Published:2009/6/30 2:00:00 Author:May

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SPEECH_FILTER

Published:2009/6/30 1:40:00 Author:May

Pair of Bessel-type high-pass filters removes undesired components created by peak clipping during audio signal processing, Developed for use with automatic level control applications of NE571 analog compandor.-W.G. Jung, Gain Control IC for Audio Signal Pro-cessing, Ham Radio, July 1977, p 47-53.   (View)

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AUDIO_FILTERS_FOR_SNR_MEASUREMENT

Published:2009/6/30 Author:May

Used in checking performance of Harris HC-55516/55532 haff-duplex modulator-demodulator systems for converting voice signals into s rial NRZ digital data and reconverting that data back to voice. Supply required for opamp sections is ±15 V. Response of input filter is down 3 dB at 3 kHz and is down 20 dB at 9 kHz. Response of output filter is flat up to 3 kHz and down more than 45 dB from 3.8 kHz to 100kHz.- Linear & Data Acquisition Products, Harris Semiconductor,Melbourne,FL,Vol.1,1977,p 5-10.   (View)

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SPEECH_FlLTER

Published:2009/6/29 23:56:00 Author:May

High-pass and low pass filters in cascade provide comer frequencies of 300 and 3000 Hz for limiting audio bandwidth to speech frequencies. Rolloff beyond corners is -40 dB per decade. Input-to-output gain is 1.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 2-49-2-52.   (View)

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ACTIVE_RC_FILTER_FOR_FREQUENCIES_UP_TO_150_kHz

Published:2009/6/29 23:03:00 Author:May

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TUNABLE_ACTIVE_FILTER

Published:2009/6/29 23:01:00 Author:May

Circuit NotesThe high-pass and low-pass outputs cov-ering the range of 300 Hz to 3000 Hz have been summed in the fourth op amp to provide a notchoutput. The potentiometers must have a re-verse log taper. Fixed-frequency active filter center frequency is1 kHz, with a Q of 50.   (View)

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SECOND_ORDER_STATE_VARIABLE_FILTER（1_kHz，Q＝10）

Published:2009/6/29 22:56:00 Author:May

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BIQUAD_FILTER

Published:2009/6/29 22:54:00 Author:May

Circuit Notes The biquad filter, while appearing very similar to the state-variable filter, has a bandwidth that is fixed regardless of center frequency. This type of filter is useful in applications such as spectrum analyzers, which require a filter with a fixed bandwidth.   (View)

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EQUAL_COMPONENT_SALLEN_KEY_LOW_PASS_FILTER

Published:2009/6/29 22:53:00 Author:May

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FILTER_NETWORKS

Published:2009/6/29 22:50:00 Author:May

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500_Hz_SALLEN_KEY_BANDPASS_FILTER

Published:2009/6/29 22:48:00 Author:May

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UNIVERSAL_STATE_VARIABLE_FILTER

Published:2009/6/29 21:51:00 Author:May

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BANDPASS_STATE_VARIABLE_FILTER

Published:2009/6/29 21:50:00 Author:May

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Current-voltage converter circuit

Published:2011/7/28 4:24:00 Author:John | Keyword: Current-voltage converter

Current-voltage converter circuit is shown.   (View)

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THREE_AMPLIFIER_ACTIVE_FILTER

Published:2009/6/29 21:48:00 Author:May

Circuit NotesThe active filter is a state variable filter with bandpass, high-pass and low-pass outputs, It is a classical analog computer method of implementing a filter using three amplifiers and only two capacitors.   (View)

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