| 摘要 |
The invention relates to a method and a circuit (500) for generating a sub-harmonic of a periodic signal (100). Conventional methods of generating sub-harmonics of a periodic signal, e.g. for bass enhancement of audio signals, create considerable artefacts. This affects the timbre, the color of the audio signal. The invention presents a method of generating a sub-harmonic of a periodic signal (100) which, added to the original audio signal, produces a more natural audio signal with bass enhancement. In a first embodiment of the invention, the signal (100) is clipped at a first predetermined level (a) in every second period (116) of the signal when the amplitude of the signal is larger than a second predetermined level. In a second embodiment of the invention, the signal is clipped at a second level (a) in every first period (115) and at a third level (b) in every second period (116) of the signal, provided that the signal level exceeds a first predetermined level.
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