Method to acquire preferred dynamic range function for speech enhancement

1. A device comprising:

a user interface that generates an input signal in response to a user input;

a memory that stores instructions; and

a circuit, wherein the circuit executes the instructions to perform operations, the operations comprising:

sending a test signal to a speaker of an earphone in response to the input signal, wherein the earphone includes an ambient microphone, an ear canal microphone, the speaker, and a sound isolating component, and wherein the sound isolating component is configured to form a level of acoustic isolation between a first side of the earphone and a second side of the earphone when the earphone is worn by a user, wherein the test signal has at least one frequency component less than or equal to 60 Hz, wherein the frequency component is also greater than or equal to 30 Hz, and wherein the test signal has a predetermined time length;

receiving an ear canal microphone signal during the emission of the test signal by the speaker;

calculating a seal integrity value by comparing the test signal sent to the speaker to the ear canal microphone signal, wherein the seal integrity value is calculated by using at least one of an average cross-correlation magnitude or an average cross-correlation magnitude divided by a scalar value;

sending a message to the user of a bad seal if the seal integrity value is below a threshold value or sending a message to the user of a good seal if the seal integrity value is equal to or greater than the threshold value;

receiving an ambient microphone signal;

generating a frequency dependent ambient sound pressure level curve from the ambient microphone signal for a frequency range;

comparing the pressure level curve to a reference level curve within the frequency range and if the pressure level curve is less than the reference level curve anywhere within the frequency range then a message is sent to the user that calculation of an DRCF can proceed;

selecting an audio content to use for a DRCF test; and

sending the audio content to the speaker.

2. The device according to claim 1 , wherein the time length is less than or equal to 5 seconds.

3. The device according to claim 1 , wherein the message is an visual message.

4. The device according to claim 1 , wherein the device is a mobile phone or a tablet or a watch, and wherein the device is wirelessly connected to the earphone.

5. The device according to claim 1 , wherein the user interface is a touch screen.

6. The device according to claim 5 , wherein the message is a visual message displayed on the user interface.

7. The device according to claim 1 , wherein the speaker plays the test signal from the first side.

8. The device according to claim 1 , wherein the ear canal microphone measures sound from the first side.

9. The device according to claim 1 , wherein the ambient microphone measures sound from the second side.

10. The device according to claim 1 , wherein the audio is used to test the seal in a second earphone, wherein the second earphone includes a second ambient microphone.

11. The device of claim 1 , wherein the sound isolating component is an eartip.