1. The principle is different.
Starting from the noise propagation characteristics, the "reciprocal" superposition cancellation is used to reduce the noise intensity, which is usually called ANC active noise reduction. Hybrid noise reduction is the collection of noise signals through a microphone. Hybrid Active Noise Cancelling Headphones， After analysis and processing, a signal with the same amplitude and frequency but opposite phase to the noise signal is generated on the headphone speaker to cancel the original noise signal.
2. Different applications
The application range of ANC active noise cancellation technology varies.
Because the hybrid noise reduction is sensitive to the phase of the inverted wave, if the phase deviation is too large, the cancellation effect will be reduced, and even because the frequency is too high, the signal designed to be inverted will become the in-phase signal under the deviation. , which becomes noise enhancement. The higher the frequency of the noise, the more likely it is to increase rather than decrease, which is why hybrid noise reduction is not effective for high frequency noise.
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