Non-blocking dual driver earphones
A head-worn sound reproduction device is provided in the form of left and right earphones, which can either be clipped to each ear or mounted on other headgear. The earphones deliver high fidelity audio to a user's eardrums from near-ear range, in a lightweight form factor that is fully “non-blocking” (allows coupling in and natural hearing of ambient sound). Each earphone has a woofer component that produces bass frequencies, and a tweeter component that produces treble frequencies. The woofer outputs the bass frequencies from a position close to the ear canal, while the tweeter outputs treble frequencies from a position that is either close to the ear canal or further away. In certain embodiments, the tweeter is significantly further from the ear canal than the woofer, leading to a more expansive perceived “sound stage”, but still with a “pure” listening experience.
1. A wearable head device comprising:
a woofer component including a woofer sound outlet;
a tweeter component including a tweeter sound outlet;
a support structure configured to provide mechanical support for the woofer component and the tweeter component such that the woofer sound outlet is spaced from the tweeter sound outlet by at least ½ centimeters;
an input configured to receive an audio signal;
a woofer output coupled to the woofer component;
a tweeter output coupled to the tweeter component;
an audio signal filter coupled to the input and drivingly coupled to the woofer component through the woofer output, the audio signal filter configured to apply a first gain to at least a first frequency band in a first frequency range extending from 20 Hz to 100 Hz and further configured to apply a second gain to at least a second frequency band in a second frequency range extending from 100 Hz, wherein the first gain substantially exceeds the second gain; and
a transmissive display coupled to the support structure, the transmissive display configured to rest proximate the eyes of a user of the wearable head device.
2. The wearable head device according to claim 1 , wherein:
the wearable head device further comprises one or more air impermeable portions comprising one or more air impermeable materials; and
the one or more of the air impermeable portions comprise one or more of the woofer component, the tweeter component, and the support structure.
3. The wearable head device according to claim 1 , further comprising a channel delay between the input and the woofer output.
4. The wearable head device according to claim 1 , wherein the first gain exceeds the second gain by at least 10 dB.
5. The wearable head device according to claim 1 , wherein the support structure comprises an ear clip mounting structure.
6. The wearable head device according to claim 1 , wherein the support structure comprises a head spanning mounting structure.
7. The wearable head device according to claim 1 , wherein:
the audio signal filter comprises a crossover filter comprising a low pass filter, the crossover filter having a crossover frequency, and
the second frequency range extends from 100 Hz up to the crossover frequency.