Position: Index > Basic Circuit >

Single Supply Phone Speech Filter

2015-01-16 12:10  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

The audio spectrum range of human speech is most frequently on 300 Hz to 3 kHz. In phone, this range should be limited. Usually, DSP chip is used to perform this limitation but to reject high-frequency components, it requires an anti-aliasing filter. We can solve this problem by using a single-supply phone speech filter circuit. Here is the circuit :

Single Supply Phone Speech Filter circuit schematic diagram

This circuit consist of four resistors, two op-amps and five capacitors. This circuit is designed to be compact and low-power. It also scalable for even lower power consumption. You can use a passive (resistors) voltage divider for VCC/2 or you can use an active? virtual ground circuit. [Source: Analog Application Journal]








Reprinted Url Of This Article:
http://www.simplecircuitdiagram.com/2010/02/03/single-supply-phone-speech-filter/