Acoustic sealing analysis system
A device or a method using the device includes a balloon configured to seal a user's orifice, where the balloon is configured to produce an acoustic seal between a first side and a second side of the balloon in an ear canal. At least a second side of the balloon is fitted into the ear canal. Audio processing circuitry produces an audio signal for driving a speaker in the device and to measure sound level using output from the microphone in the device while the speaker is being driven by the audio signal. The device or method further includes control circuitry to evaluate a seal quality of the device. Other embodiments are disclosed.
1. An audio device configured to test a seal of an earphone comprising:
a memory that stores instructions; and
a processor, wherein the processor is configured to execute the instructions to perform operations, the operations comprising:
generating a test signal, wherein the test signal includes multiple frequency components, wherein at least one component lies between a range of 30 Hz and 200 Hz;
sending the test signal to a speaker of an earphone, wherein the earphone includes a first microphone, the speaker, and a sealing section, and wherein the sealing section is configured to form an acoustic barrier between a first side of the earphone and a second side of the earphone when the earphone is worn by a user,
receiving a first microphone signal from the first microphone;
calculating a value, using a first signal and a second signal, 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;
comparing the value to a threshold to determine a seal quality between the first side and the second side;
generating a message to convey the seal quality; and
sending the message to the user.
2. The audio device according to claim 1 , wherein the message is an acoustic message.
3. The audio device according to claim 1 , wherein the message is a visual message sent to a display of the audio device.
4. The audio device according to claim 1 , wherein the speaker plays the test signal from the first side.
5. The audio device according to claim 4 , wherein the first microphone measures sound from the first side.
6. The audio device according to claim 4 , wherein the first microphone measures sound from the second side.
7. The audio device according to claim 1 , wherein the first signal is the test signal and the second signal is the first microphone signal.
8. The audio device of claim 1 , wherein the first signal is the test signal and the second signal is a modified first microphone signal.
9. The audio device according to claim 8 , wherein the modified first microphone signal is generated by applying a low pass filter to the first microphone signal, wherein the upper cutoff frequency is less than or equal to 200 Hz.
10. The audio device of claim 1 , wherein the first signal is a modified test signal and the second signal is the first microphone signal.
11. The audio device according to claim 1 , wherein the first signal is a modified test signal and the second signal is a modified first microphone signal.
12. The audio device according to claim 11 , wherein the first microphone signal is generated by applying a low pass filter to the first microphone signal, wherein the upper cutoff frequency is less than or equal to 200 Hz.
13. The audio device according to claim 1 , wherein the earphone includes a second microphone.
14. The audio device according to claim 13 , wherein the operations further comprise:
receiving a second microphone signal from the second microphone.
15. The audio device according to claim 14 , wherein the first signal is the first microphone signal and the second signal is the second microphone signal.
16. The audio device of claim 14 , wherein the first signal is a modified first microphone signal and the second signal is the second microphone signal.
17. The audio device of claim 14 , wherein the first signal is a modified first microphone signal and the second signal is a modified second microphone signal.
18. The audio device of claim 1 , wherein the seal quality is good if the value is at or above the threshold value.
19. The audio device of claim 1 , wherein the sealing section is composed of at least one of rubber, silicone, a flexible polymer, or a combination thereof.
20. The audio device of claim 1 , wherein the sealing section is an eartip.