Time domain analysis is usually the input of a test signal to the audio device to be measured, and the time waveform of the output signal of the device is observed to evaluate the relevant performance of the device. The most commonly used time domain analysis test signals are sinusoidal signals, square wave signals, step signals, and single tone mutated signals. For example, a sinusoidal signal is input to the device, and observing time domain waveform distortion of the output signal is a time domain analysis method.
The square wave analysis has good abruptness and periodicity. By observing the output signal waveform of the equipment's square wave signal, the performance of the equipment can be well detected. Therefore, the square wave signal becomes the most commonly used time domain analysis signal.
The step signal analysis is relatively simple and is mainly used to detect the sensitivity of the audio device to the sudden change of the signal. The parameters of the step signal analysis are usually two, that is, the rise time and pulse width of the step response signal. The smaller the rise time, the more responsive the device is to sudden changes in the signal and the better the transient characteristics; the smaller the pulse width, the better the damping characteristics of the device and the more stable the system.
The sudden increase in the peak value of a sinusoidal signal at a certain moment, forming a sudden change, is a monotone mutation signal. Since the energy of a single tone burst signal is concentrated in a very narrow frequency range, a frequently-used tone burst signal detects the response of an audio device to a specific frequency. The main purpose of the monophonic abrupt signal is to quickly determine the damping characteristics of certain audio devices, such as speakers.
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