Patent ID: 11889275
Assignee: STATON TECHIYA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A device comprising:
a sealing section, wherein the sealing section is configured to provide a level of sound attenuation between a first volume and a second volume;
an ear canal microphone configured to generate an ear canal microphone signal, wherein the ear canal microphone measures sound from the first volume;
an ambient sound microphone configured to generate an ambient microphone signal, wherein the ambient sound microphone measures sound from the second volume;
a speaker configured to play sound into the first volume;
a memory configured to store instructions;
a processor, wherein the processor is configured to execute the instructions to perform operations, the operations comprising:
sending a test signal to the speaker;
receiving the ear canal microphone signal from the ear canal microphone, wherein at least a portion of the ear canal microphone signal was generated by measuring the sound from the first volume while the test signal is played from the speaker into the first volume;
applying a low pass filter to the ear canal microphone signal to generate a filtered microphone signal, wherein the low pass filter includes a cutoff frequency below 200 Hz so that frequencies above the cutoff frequency are reduced in amplitude compared to amplitudes of frequencies below the cutoff frequency;
calculating a value using the filtered microphone signal and a reference response,

wherein the value is the result of a non phase calculation of at least one of a coherence, a correlation, a cross-correlation, a difference, or a combination thereof, and wherein the value is not a ratio of intensities of the filtered microphone signal and the reference response;
comparing the value to a threshold to determine a seal quality between the first volume and the second volume;
generating a message to convey the seal quality; and
sending the message to the user.