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 left woofer component including a left woofer sound outlet;
a left tweeter component including a left tweeter sound outlet;
a left support structure configured to provide mechanical support for the left woofer component and the left tweeter component such that the left woofer sound outlet is spaced from the left tweeter sound outlet by at least ½ centimeters;
a right woofer component including a right woofer sound outlet;
a right tweeter component including a right tweeter sound outlet; and
a right support structure configured to provide mechanical support for the right woofer component and the right tweeter component such that the right woofer sound outlet is spaced from the right tweeter sound outlet by at least ½ centimeters;
an input configured to receive an audio signal;
a left woofer output coupled to the left woofer component;
a left tweeter output coupled to the left tweeter component;
a right woofer output coupled to the right woofer component;
a right tweeter output coupled to the right tweeter component;
a left audio signal filter coupled to the input and drivingly coupled to the left woofer component through the left woofer output, the left 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 that extends from 100 Hz, wherein the first gain substantially exceeds the second gain;
a right audio signal filter coupled to the input and drivingly coupled to the right woofer component through the right woofer output, the right audio signal filter configured to apply the first gain to at least the first frequency band and further configured to apply the second gain to at least the second frequency band; and
a transmissive display coupled to one or both of the left support structure and the right 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 left woofer component, the right woofer component, the left tweeter component, the right tweeter component, the left support structure, and the right support structure.
3. The wearable head device according to claim 1 , further comprising a left channel delay between the input and the left woofer output; and a right channel delay between the input and the right 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 one or more of the left support structure and the right support structure comprises an ear clip mounting structure.
6. The wearable head device according to claim 1 , wherein one or more of the left support structure and the right support structure comprises a head spanning mounting structure.
7. The wearable head device according to claim 1 , wherein:
the left audio signal filter comprises a left crossover filter comprising a low pass filter, the left crossover filter having a crossover frequency,
the second frequency range extends from 100 Hz up to the crossover frequency, and the right audio signal filter comprises a right crossover filter.