Device for monitoring a sound pressure level

1. A device comprising:

an input interface releasably coupled to an audio source, the input interface configured to receive an audio signal;

an output interface releasably coupled to an output device to send the audio signal to the output device;

a path associated with the audio signal, the path having:

a first point;

a resistive element positioned after the first point; and

a second point positioned after the resistive element;

a circuit to:

determine a first voltage associated with the audio signal at the first point;

determine a second voltage associated with the audio signal at the second point;

determine a current associated with the audio signal based at least in part on the first voltage and the second voltage;

determine a sound pressure level associated with the audio signal based at least in part on the second voltage and the current; and

cause a switch to couple to the second point based at least in part on the second voltage and the current.

2. The device as recited in claim 1 , wherein the sound pressure level is based at least in part on a predetermined efficiency.

3. The device as recited in claim 1 , further comprising:

a computer readable media accessible to the circuit, the computer readable media storing a plurality of efficiencies; and

wherein the sound pressure level is based at least in part on one of the plurality of efficiencies.

4. The device as recited in claim 1 , further comprising:

a communication interface accessible to the circuit, the communication interface for receiving an efficiency; and

wherein the sound pressure level is based at least in part on the efficiency.

5. The device as recited in claim 1 , further comprising:

a communication interface accessible to the circuit; and

wherein the circuit causes the communication interface to send a signal to a device to cause the device to generate an alert in response to determining that the sound pressure level is greater than a threshold.

6. The device as recited in claim 1 , further comprising:

a communication interface accessible to the circuit; and

wherein the circuit causes the communication interface to send a signal to a device to cause the device to generate an alert in response to determining that the sound pressure level is greater than a threshold for greater than a predetermined amount of time.

7. A circuit comprising:

a path for an audio signal, the path having a first point and a second point;

a first restive element having a first electrode coupled to the first point and a second electrode coupled to the second point;

a first analog-to-digital converter coupled to the first point;

a second analog-to-digital converter coupled to the second point;

a processor coupled to the first analog-to-digital converter and the second analog-to-digital converter; and

a computer-readable media having computer-executable instructions that, when executed by the processor, causes the processor to:

identify a first voltage associated with the audio signal at the first point;

identify a second voltage associated with the audio signal at the second point;

determine a current based at least in part on the first voltage and the second voltage;

determine a sound pressure level based at least in part on the second voltage and the current; and

cause a switch to couple to the second point based at least in part on the second voltage and the current.

8. The circuit as recited in claim 7 , wherein the sound pressure level is based at least in part on a predetermined efficiency.

9. The circuit as recited in claim 7 , wherein

the computer readable media stores a plurality of efficiencies; and

the sound pressure level is based at least in part on one of the plurality of efficiencies.

10. The circuit as recited in claim 7 , further comprising:

a communication interface coupled to the processor, the communication interface for receiving an efficiency; and

wherein the sound pressure level is based at least in part on the efficiency.

11. The circuit as recited in claim 7 , further comprising:

a communication interface coupled to the processor; and

wherein the computer-readable media has additional computer-executable instructions that, when executed by the processor, causes the processor to:

determine that the sound pressure level is greater than a threshold; and

cause the communication interface to alert a device.

12. The circuit as recited in claim 7 , further comprising:

a communication interface coupled to the processor; and

wherein the computer-readable media has additional computer-executable instructions that, when executed by the processor, causes the processor to:

determine that the sound pressure level is greater than a threshold for greater than a predetermined amount of time; and

cause the communication interface to alert a device.

13. The circuit as recited in claim 7 , further comprising;

the switch coupled between the second electrode of the first resistive element and the second point;

a second resistive element having a first electrode coupled to the first point and a second electrode; and

wherein the computer-readable media has additional computer-executable instructions that, when executed by the processor, causes the processor to:

determine that the sound pressure level is greater than a threshold; and

cause the switch to decouple from the second electrode of the first resistive element and to couple to the second electrode of the second resistive element.

14. The circuit as recited in claim 13 , wherein a resistive value of the first resistive element is less than a resistive value of the second resistive element.

15. The circuit as recited in claim 7 , further comprising;

an audio modification component coupled between the second electrode of the first resistive element and the second.

16. The circuit as recited in claim 7 , further comprising:

the switch coupled having a first electrode coupled to the second point;

a first audio modification component releasably coupled to the switch;

a second audio modification component releasably coupled to the switch;

wherein the computer-readable media has additional computer-executable instructions that, when executed by the processor, causes the processor to:

receive a first signal associated with a hearing capability of a first user; and

cause the switch to couple to the first audio modification component based at least in part on the hearing capability of the first user;

receive a second signal associated with a hearing capability of a second user; and

cause the switch to couple to the second audio modification component based at least in part on the hearing capability of the second user.

17. A device comprising:

an input interface releasably coupled to an audio source, the input interface configured to receive an audio signal;

an output interface releasably coupled to an output device to send the audio signal to the output device;

a communication interface to receive first data associated with the audio signal from a control device;

a first path associated with the audio signal, the path having:

a first point;

a resistive element on the first path after the first point; and

a second point on the first path after the resistive element;

a second path, having a first resistive value;

a third path, having a second resistive value;

a switch to couple to either the second path or the third path;

a circuit to:

receive second data associated with the audio signal at the first point;

receive third data associated with the audio signal at the second point;

determine an estimated impedance based at least in part on the first data, the second data, and the third data; and

cause the switch to couple to the second path based at least in part on the estimated impedance.

18. The device as recited in claim 17 , wherein:

the communication interface receives fourth data associated with a second audio signal; and

the circuit is configured to:

receive fifth data associated with the second audio signal at the first point;

receive sixth data associated with the second audio signal at the second point;

determine a second estimated impedance based at least in part on the fourth data, the fifth data, and the sixth data; and

cause the switch to couple to the third path based at least in part on the second estimated impedance.

19. The device as recited in claim 17 , further comprising a fourth path, having a resistive value different than the second path and the third path and wherein:

the switch is configured to couple to the fourth;

the communication interface receives fourth data associated with a second audio signal; and

the circuit is configured to:

receive fifth data associated with the second audio signal at the first point;

receive sixth data associated with the second audio signal at the second point;

determine a second estimated impedance based at least in part on the fourth data, the fifth data, and the sixth data; and

cause the switch to couple to the fourth path based at least in part on the second estimated impedance.

20. The device as recited in claim 19 , wherein the control device is the audio source.