Dear all
I'm doing initial research on a design for an active noise cancellation system (ANC). What we want to achieve is a headphone design where we want to cancel out sound from the surrounding environment, hence there is no need to let speech etc. trough, focus is maximum attenuation.
The design will then be an Audio amplifier with integrated ANC. The pick up microphone (noise) for the ANC will have to be placed in front of amplifier. Headphones is connected via an 5 m long extension cable. Audio source (IN) is preferably digital as this comes via a fiber optic link.
I looked at the development boards available but I did not see that they had the digital interface (S/PDIF, I2S) support. Is there other development boards available?
Second questions, does anyone have experience with what performance one can expect in regards of frequency range of ANC? The noise to be cancelled out is mainly alternating frequencies at high levels (100+ dB) I have seen that most solutions stop at 500-800 Hz.
