High Pass Filter

What is a high pass filter?   In order to put it simply, we could say that the high pass filter is just a filter (low-cut) that attenuates frequencies below the certain cutoff frequency and allows the frequencies above to pass. There are many kinds of high pass...

Wah Wah Filter

The definition for the wah-wah effect, according to Erickson in 1975, is that the effect is produced by periodically bringing in and out of play treble frequencies while a note is sustained. Therefore, the effect is a type of spectral glide, a “modification of...

Phaser

Electric guitar effect   Phasing is a popular effect for electric guitar. The term was often used to refer to the original tape flanging effect heard on many psychedelic records of the late 1960s. In 1968, Shin-ei’s Uni-Vibe effects pedal, designed by audio...

Ring Modulator

Analog telephony   The original application of the ring modulator was in the field of analog telephony for frequency-division multiplexing for carrying multiple voice signals over telephone cables.Frank A. Cowan invented it back in 1934 and patented in 1935 as an...

Frequency Shifter

What is a frequency shifter?   Frequency Shifter is a device which raises or lowers the frequency of an input signal. It does this using a complex amplitude modulation like technique. Unlike the pitch shifter, the frequency shifter does not preserve the harmonic...