| 摘要 |
<p>A method of partially cancelling sound 1 comprising providing first non-audio signal 4 representative of sound received by microphone 2, providing a second non-audio signal 3 representative of partially-cancelling said received sound, and combining 7 the first and second non-audio signals to provide a sound to be heard 11. Selective sound cancellation may differentiate between wanted and unwanted sounds and the second signal 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> |
