IN-EAR WEARABLE WITH HIGH LATENCY BAND LIMITING
An in-car wearable with reduced combing effects is achieved by band limiting the output of a high latency processing path, used to amplify a signal representative of the ambient noise, to frequencies where occlusion and does not occur, and providing those frequencies instead through a low latency processing path.
1 . An in-ear wearable comprising:
a housing;
an electroacoustic transducer disposed within the housing, the housing having a first end, the housing being dimensioned such that at least the first end can be inserted into a user's ear canal, wherein the electroacoustic transducer is positioned within the housing to project acoustic energy into the user's ear canal; and
a sound processor in electrical communication with the electroacoustic transducer, the sound processor being configured to:
generate a first ambient signal representing acoustic energy in an ambient environment, the first ambient signal being generated from a low-latency processing path, wherein the first ambient signal is band limited below a first frequency;
generate a second ambient signal representing acoustic energy in the ambient environment, the second ambient signal being generated from a high-latency processing path, wherein the second ambient signal is band limited above the first frequency; and
generate a noise-cancellation signal that, when transduced by the electro acoustic transducer, cancels own voice in the user's ear canal below the first frequency.
2 . The in-ear wearable of claim 1 , wherein the sound processor generates the noise-cancellation signal from, at least, a feedback signal produced by a feedback microphone, the feedback microphone being positioned such that the feedback signal represents acoustic energy the user's ear canal.
3 . The in-ear wearable of claim 1 , the sound processor is configured to generate a second noise-cancellation signal from, at least, a feedforward microphone.
4 . The in-ear wearable of claim 1 , wherein the first ambient signal is band limited according to a first filter having a first cut-off frequency at the first frequency, wherein the second ambient signal is band limited according to a second filter having a cut-off frequency at the first frequency.
5 . The in-ear wearable of claim 1 , wherein the first frequency is in the range of 800 Hz to 1200 Hz.
6 . The in-ear wearable of claim 1 , wherein the sound processor generates the first ambient signal from, at least, a feedforward signal produced by a feedforward microphone.
7 . The in-ear wearable of claim 1 , wherein the sound processor generates the second ambient signal from, at least, a second microphone.
8 . The in-ear wearable of claim 6 , wherein the first ambient signal is generated from, at least, a feedforward signal produced by a feedforward microphone, wherein the sound processor filters the second ambient signal with a filter to minimize an error signal based on the output of the filter and the feedforward signal.
9 . The in-ear wearable of claim 1 , wherein the sound processor comprises a first processor and a second processor, the first processor generating the first ambient signal and the noise-cancellation signal, the second processor generating the second ambient signal.
10 . The in-ear wearable of claim 1 , wherein the sound processor is disposed in a housing dimensioned for positioning behind the user's pinna.
11 . A method for reducing combing in an in ear wearable, the steps of the method being stored in at least one non-transitory storage medium comprising and being executed by a sound processor, the method comprising:
generating a first ambient signal representing acoustic energy in an ambient environment and providing the ambient signal to an electroacoustic transducer, the first ambient signal being generated from a low-latency processing path, wherein the first ambient signal is band limited below a first frequency, wherein the electroacoustic transducer is disposed within a housing, the housing having a first end, the housing being dimensioned such that at least the first end can be inserted into a user's ear canal, wherein the electroacoustic transducer is positioned within the housing to project acoustic energy into the user's ear canal;
generating a second ambient signal representing acoustic energy in the ambient environment and providing the second ambient signal to the electroacoustic transducer, the second ambient signal being generated from a high-latency processing path, wherein the second ambient signal is band limited above the first frequency; and
generating a noise-cancellation signal and providing the noise-cancellation signal to the electroacoustic transducer, the noise-cancellation signal being configured such that when transduced by the electro acoustic transducer, cancels own voice in the user's ear canal below the first frequency.
12 . The method of claim 11 , wherein the noise-cancellation signal is generated from, at least, a feedback signal produced by a feedback microphone, the feedback microphone being positioned such that the feedback signal represents acoustic energy the user's ear canal.
13 . The method of claim 11 , further comprising the step of generating a second noise-cancellation signal from, at least, a feedforward microphone.
14 . The method of claim 11 , wherein the first ambient signal is band limited according to a first filter having a first cut-off frequency at the first frequency, wherein the second ambient signal is band limited according to a second filter having a cut-off frequency at the first frequency.
15 . The method of claim 11 , wherein the first frequency is in the range of 800 Hz to 1200 Hz.
16 . The method of claim 11 , wherein the first ambient signal is generated from, at least, a feedforward signal produced by a feedforward microphone.
17 . The method of claim 11 , wherein the second ambient signal is generated from, at least, a second microphone.
18 . The method of claim 16 , wherein the first ambient signal is generated from, at least, a feedforward signal produced by a feedforward microphone, wherein the sound processor filters the second ambient signal with a filter to minimize an error signal based on the output of the filter and the feedforward signal.
19 . The method of claim 11 , wherein the sound processor comprises a first processor and a second processor, the first processor generating the first ambient signal and the feedback signal, the second processor generating the second ambient signal.
20 . The method of claim 11 , wherein the sound processor is disposed in a housing dimensioned for positioning behind the user's pinna.