Headphone with noise cancellation of acoustic noise from tactile vibration driver

A method of operating a headphone, the method comprising:

• filtering an input signal into a first filtered input signal and a second filtered input signal utilizing a filter;
• producing audio sound waves with an acoustic driver responsive to the input signal;
• sending the second filtered input signal directly to a tactile vibration driver and producing tactile vibrations with the tactile vibration driver to be felt by a user responsive to the second filtered input signal;
• and
• reducing effects of incidental acoustic noise generated by the tactile vibration driver responsive to a noise cancellation unit generating an adjustment signal to apply to the first filtered input signal, the noise cancellation unit comprising an energy detector coupled with a dynamic equalizer connected between the filter and the acoustic driver and having its own fixed, predetermined transfer function based at least partially on a transfer function associated with operation of the tactile vibration driver to subtract signals at frequencies of the adjustment signal based on the fixed, predetermined transfer function.

A method of making one or more headphones, the method comprising:

• determining a fixed, predetermined transfer function of a first tactile vibration driver by measuring acoustic noise generated by the first tactile vibration driver within an enclosure of a first headphone housing the first tactile vibration driver;
• and
• producing one or more headphones including:
• an acoustic driver, a tactile vibration driver, and enclosure, each of the one or more headphones having the same fixed, predetermined transfer function as the first tactile vibration driver and the first headphone;
• a filter configured to filter an input signal into a first filtered input signal and a second filtered input signal and to send the second filtered input signal directly to the tactile vibration driver to generate tactile vibration;
• and
• a noise cancellation unit operably coupled between the filter and the acoustic driver, the noise cancellation unit comprising an energy detector coupled with a dynamic equalizer, the noise cancellation unit configured to:
• generate an adjustment signal by passing the input signal through transfer function elements configured based, at least in part, on the fixed, predetermined transfer function;
• and
• transmit an output signal for reproduction by the acoustic driver responsive to adjusting the first filtered input signal with the adjustment signal utilizing the dynamic equalizer to subtract signals at frequencies of the adjustment signal based on the fixed, predetermined transfer function of the first tactile vibration driver.