| 摘要 |
A method of adding high frequency content to an input signal to form an augmented signal, the method comprising the steps of: (a) providing an initial signal having a first predetermined lower spectral range; (b) utilising the initial signal to form synthesised high frequency components of the initial signal; (c) filtering the initial signal with a low pass filter and filtering the synthesised high frequency components with a high pass filter (d) combining the filtered signals to form the augmented signal.
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