audio signal filtering, amplify

timer Asked: Jan 2nd, 2016

Question description

An audio signal needs to be filtered into three bands before being amplified. These bands are defined as:

Bass <300Hz

300Hz<Mid Range < 4kHz

Treble > 4kHz

The following constraints apply to the circuit:

The filters should have a unity gain if possible

A minimum attenuation of 40dB is required in the stopband (More attenuation is acceptable)

The phase response is not important

In order to design these filters there are a number of topologies that can be used.

Using the Multiple feedback topology:-

a) Describe the characteristics and operation of this topology.

b)Design 3 filters to fulfill the above criteria. Some parameters of the design have been left open on purpose so that own decisions are taken. Produce a schematic of the filters and justify all the choices made.

c) Simulate the filters and observe if they achieve the criteria. Present relevant Bode plot and explain results.

d) Design a peak detector interfaced with a bargraph display to show a moving average value of the signal.

e) Devise a test or tests to test the salient characteristics of the filter.

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