What is a comb filter?
The ridge filter is the visual representation of the frequency response, which is characterized by a number of consistent and regularly spaced spikes for a certain time. This frequency response is caused by a combination of sound and its duplicate, which is delayed. The display of this response consists of a decrease and peaks due to phase interference and looks somewhat like a ridge teeth. Deep, narrow notches are used to display weakened signals, and all these characteristics are the reason why this representation was named the name of the "ridge filter". The effect of the comb filtering can cause many problems for living sound or music.
Recording in an audio studio, especially those that are small with the walls close to it, can provide the effect of the ridge filter. This gives recording a hollow sound, a similar effect of lusts or phaser. Small rooms also increase the likelihood of a ridge filter, as short echoes that can turn into larger echoes can thicken the recording sound. Echoes are not gorgeAM's device accepted as an echo, but rather as a sound to be recorded.
The effect of the ridge filter also occurs due to the boundaries in the room or recording. Reflective surfaces create echoes and should generally be kept in a minimum in the room or recording space to prevent any filter effects. Other objects in rooms such as chairs or furniture can disrupt the sound and create an echo that will affect the quality of the recording. Objects, such as these, are therefore often maintained in at least in the recording space, with only basic recording devices left. This usually includes only a microphone and possibly a notes rack.
The prevention of the ridge filter requires the walls to apply highly absorb surfaces on the walls. The surface can also be diffused and applied directly to the ceiling of the room. Common materials for use for this type of solution include rigidCrocla fibers or foam, which moves in a thickness range between 1 and 4 inches (2.54 and 10.16 cm). However, floors are not covered with any type of materials that absorb or diffuse echoes to prevent the ridge filter. Sound studios and even auditoriums usually have a linoleum or hardwood floor to allow life to live sound.