| 摘要 |
<p>A noise cancellation method comprising providing a first non-audio signal representative of a desired sound to be listened to, providing a second non-audio signal derived from ambient sound, altering the phase of the second signal to provide a substantially fully-cancelling non-audio signal and a partially-cancelling non-audio signal, and combining the first non-audio signal with the substantially fully-cancelling and partially-cancelling non-audio signals to provide a sound to be heard. Selective sound cancellation may differentiate between wanted and unwanted sounds and the noise-cancelling signals may be chosen from a range of differing preset non-audio signals with sound-cancelling parameters such as phase shift amount, time delay, frequencies, volume, equaliser, compression, gating, spectral enhancement, threshold, range, gain, ratio, attack, release, minimum, maximum, sensitivity, vocal or reverberation. The phase-shift for the partially-cancelled sound may be between 1 and 179 degrees, and preferably 45 degrees. The present invention allows the user to hear a desired sound, such as a stored audio file whilst still being able to be aware of ambient sound such as police sirens, fire alarms and doorbells. The system and method may be part of a software app for use with a phone.</p> |
