| To drive a stroboscope from an audio signal, the signal must first be reduced to its low-frequency component. This can be done with the...
More about filter (161)
| The diagram shows how a three-phase sine wave oscillator can be built with a single Type UAF42 state-variable filter and some resistors an...
| The LTC1062 is an integrated fifth-order low-pass filter that stands out by the absence of any d.c. error. This is achieved by keeping the...
| Dimensioning and testing active filters for audio and measurement applications is not seriously good fun, in fact, many hobbyists seem to...
| The MAX280 is a 5th-order all-pole instrumentation lowpass filter with no DC error. The filter uses an external resistor and capacitor to is...
| To make a certain musical instrument in a group stand out, a so-called presence filter is normally used. Unfortunately, the types usuall...
| This circuit shows that only a handful of parts is needed to make a light-controlled switch with a digital power buffer output capable o...
| The mains filter described in ‘PC Topics’ (April 1998) could do with two useful additions: a fuse monitor and a voltage indicator. The f...
| In this instalment, we have another look at filters and their synthesis and then turn our attention to modulation techniques.
| An important function of digital audio signal processing is the generation of reverberation and echo. This instalment looks at how ech...