Time frequency characteristics describe how the frequency domain characteristics of the audio device change over time on the time axis. The time frequency characteristic not only describes the response state of the audio device in the course of the frequency change, but also describes the response state of the audio device in the course of time change, that is to describe the response characteristic of the audio device from a three-dimensional perspective. For playback equipment, the subjective perception of hearing, such as whether the bass is clean, whether the background is clear, whether the level is clear, the depth of the sound field, etc. are all closely related to the time-frequency characteristics of audio equipment. The time frequency characteristics of audio equipment are an important aspect of objectively evaluating the performance of audio equipment.
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