![]() ![]() Picture 2 shows a Fourier series expansion: additive synthesis of a square wave formed by the fundamental and the first eight weighted harmonics note a 0° phase shift of the square wave The square waveform consists of only odd harmonics. ![]() Their summation is called a Fourier series. ![]() To explain phase distortion, we will consider a square wave constructed from the fundamental frequency and 9 odd harmonics. Non-linear means the phase shift introduced by a circuit is not directly proportional to frequency. Phase distortion is the change in the shape of a waveform that occurs if a phase response of a signal processing circuit (such as an amplifier or a filter) is not linear over the frequency range of the equipment. The square waveform of eight odd harmonics and the fundamental frequency with a linear phase shift applied to all nine frequency components In audio engineering, frequency response distortion is mainly caused by the acoustic properties of the room in which sound recording and sound reproduction equipment is installed. It is a characteristic sound made by tube amplifiers because of a distinctive pattern of harmonics added by these amplifiers.įrequency response distortion occurs if different frequencies are amplified by different amount in electronic equipment. Tube sound is another kind of intentional distortion. At the same time, the vocals recorded or sounding through the sound system must remain undistorted. ![]() For example, it is common for musicians to use distortion pedals with electric guitars that deliberately distort the guitar sound. In some situations, however, distortion may be desirable. An illustration of Fourier series expansion: additive synthesis of a square wave formed by the fundamental and the first eight weighted harmonicsĭistortion is usually unwanted and it is usually desirably to minimize or completely eliminate it because, for example, electronic equipment can malfunction due to changed supply waveshape and motors can run hotter due to high harmonic content in their currents. ![]()
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