Graphic equalizer is a multi-range corrector of the amplitude-frequency characteristics of electric sound signals. The boundaries of the full range of frequencies in which the amplitude-frequency characteristic is corrected are determined by the range of frequencies perceived by the human ear. The lower limit of this range is sound vibrations with a frequency of 20 Hz. (oscillations per second), and the upper – 20 KHz. (thousand oscillations per second).
The graphic equalizer, depending on its accuracy, determined by the width of one band, may contain a different number of ranges in which the values of the amplitude-frequency characteristics are set. For example, with a bandwidth of one octave, the equalizer will contain 10 bands, with a bandwidth of 1/2 octaves – 15 bands, and Continue reading
Interference is the phenomenon of amplification of oscillations at some points in space and weakening of oscillations at other points as a result of the superposition of two or more waves arriving at these points. Wave interference is possible if the phase difference of the waves is constant in time, i.e., the waves are coherent. Wave interference is valid for waves of any nature and frequency.
When recording from several microphones, it is necessary to take care of their phasing: the signals from the microphones should not fall into the recording path in the opposite phase, since this can lead to their mutual compensation up to the complete disappearance. Without noticeable distortion of the timbre caused by interference of direct and reflected signals, the microphone can be brought closer to any reflecting surface at a distance of at least 1-1.5 m. Continue reading