DIFFERENTIAL SPECTROGRAM FOR ANALYSIS OF NONLINEARITY

申请机构提出了一种基于数字信号处理的观察助听器和其他音频设备非线性的方法，并命名为差分频谱图。该技术允许观察者听到信号，并以显示的形式看到其失真和频率响应，该显示在屏幕上水平滚动，随着非线性的出现而变化。显示的非线性可以采取压缩、削波、谐波失真或互调失真的形式。非线性可以在器件的频率响应或隔离的情况下看到。非线性数据可以被记录和处理，以便以各种静态格式显示，或者在对被测设备进行更改或调整时观察。将显示参数设置为与听觉信号处理的已知特征相对应，以使非线性的描述有意义。该系统可用于语音、噪声、音乐或任何其他信号。没有现成的测试方法允许使用语音和其他现实世界信号实时观察助听器性能的非线性。这样，分配器不仅可以观察到定量数据，还可以在收听时看到信号和设备的确切相互作用。在音乐录制和音频测试方面也有潜在的应用。

The applicant organization proposes a method of observing nonlinearity in hearing aids and other audio devices based in digital signal processing, and named a differential spectrogram. The technique allows the observer to hear the signal and see its distortion and frequency response in the form of a display that scrolls horizontally across the screen, changing as nonlinearities, appear. The nonlinearities displayed may take the form of compression, clipping, harmonic distortion or intermodulation distortion. The nonlinearities can be seen in the context of the frequency response of the device or in isolation. The nonlinearity data can be recorded and processed for display in various static formats, or observed while changes or adjustments are made to the device under test. The display parameters are to be set to correspond to known characteristics of auditory signal processing to make the depiction of nonlinearity meaningful. The system can be used with speech, noise, music or any other signal. PROPOSED COMMERCIAL APPLICATION No readily available test method allows real-time observation of nonlinearity in hearing aid performance using speech and other real-world signals. As a result, dispensers can observe not only quantitative data but see the exact interaction of signal and device while listening. There are potential applications in music recording and audio testing as well.