Speaker, terminal, and speaker control method

1. A terminal, comprising:

a speaker, comprising a coil, a magnetic diaphragm, and a voice coil; and

an audio amplifier integrated circuit, connected to the voice coil and the coil, wherein the audio amplifier integrated circuit comprises a first detection circuit having an input end connected to two pins of the coil, wherein the audio amplifier integrated circuit further comprises a second detection circuit having an input end connected to a first pin and a second pin of the voice coil, wherein the audio amplifier integrated circuit further comprises a driver circuit having an input end connected to an output end of the first detection circuit and connected to an output end of the second detection circuit, and wherein the audio amplifier integrated circuit is configured to:

measure, using the second detection circuit, a voltage or current across a first end and a second end of the voice coil; and

measure, using the first detection circuit, an inductance value, across a first end and second end of the coil, as affected by the magnetic diaphragm;

wherein the driver circuit is configured to determine a driver voltage or driver current of the voice coil based on the voltage or the current, and based on the inductance value; and

wherein the voice coil is configured to drive, based on the driver voltage or the driver current, the magnetic diaphragm to vibrate.

2. The terminal according to claim 1 , wherein:

the speaker further comprises a front cover, a frame, and a magnet; and

the coil is located on an inner side of the front cover, the magnetic diaphragm is located between the coil and the voice coil, a periphery of the magnetic diaphragm is adhered to a first side of the frame, the magnet is located on a second side of the frame, and the first side and the second side are opposite sides of the frame.

3. The terminal according to claim 1 , wherein the magnetic diaphragm comprises:

a diaphragm; and

a magnetic conductive material coated on a surface of the diaphragm.

4. The terminal according to claim 1 , wherein the audio amplifier integrated circuit being connected to the voice coil and the coil comprises:

a lead of the voice coil being welded to a solder pad at a bottom of a frame, a lead of the coil being welded to the solder pad, and the solder pad being electrically connected to the audio amplifier integrated circuit.

5. The terminal according to claim 1 , wherein the terminal is a mobile phone.

6. The terminal according to claim 1 , wherein the terminal is a tablet.

7. The terminal according to claim 1 , wherein the terminal is a notebook computer.

8. The terminal according to claim 1 , wherein the second detection circuit is configured to measure the voltage at the first end of the voice coil and the second end of the voice coil, and the driver circuit is configured to determine the driver voltage of the voice coil based on the voltage and the inductance value.

9. The terminal according to claim 1 , wherein the second detection circuit is configured to measure the current at the first end of the voice coil and the second end of the voice coil, and the driver circuit is configured to determine the driver current of the voice coil based on the current and the inductance value.

10. A speaker, comprising:

a front cover;

a coil, located on an inner side of the front cover;

a frame;

a magnet;

a magnetic diaphragm spaced, with respect to the coil, to act as a core for the coil and to affect inductance of the coil as the magnetic diaphragm is moved;

a voice coil, wherein the magnetic diaphragm is located between the coil and the voice coil, a periphery of the magnetic diaphragm is adhered to a first side of the frame, the magnet is located on a second side of the frame, the first side and the second side of the frame are opposite sides of the frame, and the voice coil is configured to drive the magnetic diaphragm to vibrate; and

an audio amplifier integrated circuit comprising:

a first detection circuit having an input end connected to two pins of the coil, and having circuitry for measuring an inductance value, across a first end and a second end of the coil, of the inductance of the coil as affected by the magnetic diaphragm;

a second detection circuit having an input end connected to a first pin of the voice coil and a second pin of the voice coil, and having circuitry for measuring a voltage or current across a first end and a second end of the voice coil; and

a driver circuit having an input end connected to an output end of the first detection circuit and connected to an output end of the second detection circuit, and having circuitry for determining a driver voltage or driver current of the voice coil based on the voltage or current, and based on the inductance value.

11. The speaker according to claim 10 , wherein the magnetic diaphragm comprises:

a diaphragm; and

a magnetic conductive material coated on a surface of the diaphragm.

12. The speaker according to claim 10 , wherein leads at a first end of the voice coil and a second end of the voice coil are welded to a solder pad at a bottom of the frame, a lead of the coil is welded to the solder pad, and the solder pad is electrically connected to the audio amplifier integrated circuit.

13. The speaker according to claim 10 , wherein is speaker is comprised in a mobile phone.

14. The speaker according to claim 10 , wherein is speaker is comprised in a tablet.

15. The speaker according to claim 10 , wherein is speaker is comprised in a notebook computer.

16. A method, comprising:

obtaining an inductance value at a first end of a coil and a second end of the coil by measuring, using a first detection circuit that is of an audio amplifier integrated circuit of a speaker and that has an input end connected to two pins of the coil, the inductance value, across the first end and second end of the coil, as affected by a magnetic diaphragm of the speaker;

obtaining a voltage or a current at a first end of a voice coil and a second end of a voice coil by measuring, using a second detection circuit that is of the audio amplifier integrated circuit and that has an input end connected to a first pin of the voice coil and a second pin of the voice coil, a voltage or current across the first end and the second end of the voice coil;

determining, by a driver circuit having an input end connected to an output end of the first detection circuit and connected to an output end of the second detection circuit, an adjusted driver voltage or an adjusted driver current of the voice coil based on the voltage or current, and based on the inductance value; and

outputting the adjusted driver voltage or the adjusted driver current to the voice coil, causing the voice coil to drive, under an action of the adjusted driver voltage or the adjusted driver current, the magnetic diaphragm to vibrate.

17. The method according to claim 16 , wherein the magnetic diaphragm comprises a diaphragm and a magnetic conductive material coated on a surface of the diaphragm.