System, apparatus and method for generating sound

Patent metadata

Field	Value
Publication number	US-11347472-B2
Application number	US-202016930128-A
Country	US
Kind code	B2
Filing date	Jul 15, 2020
Priority date	Sep 16, 2015
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A method for generating sound with a motor, including: generating a motor-driving signal having an audio signal component; applying the motor-driving signal to the motor, wherein the motor-driving signal drives the motor to generate a sound corresponding to the audio signal component; applying a bandpass filter to the motor-driving signal to generate a filtered motor-driving signal; and applying the filtered motor-driving signal to a speaker to present audio content consistent with the sound generated by the motor.

First claim

What is claimed is:

1. A method for generating sound with a motor, comprising:
generating a first motor-driving signal for a first stator coil pair and a second motor-driving signal for a second stator coil pair;
applying the first motor-driving signal and the second motor-driving signal to the first stator coil pair and the second stator coil pair of the motor, respectively, to control a rotor of the motor to determine an equilibrium position corresponding to at least one of the first motor-driving signal or the second motor-driving signal, wherein the first motor-driving signal and the second motor-driving signal drive the rotor of the motor to vibrate relative to the equilibrium position to generate a sound corresponding to an audio signal component;
applying a bandpass filter to the first motor-driving signal and the second motor-driving signal to generate a first filtered motor-driving signal and a second filtered motor-driving signal, respectively; and
applying the first filtered motor-driving signal and the second filtered motor-driving signal to a speaker to present audio content consistent with the sound generated by the motor.

2. The method of claim 1 , wherein the first motor-driving signal and the second motor-driving signal are filtered by the bandpass filter to a bandwidth of 20 Hz to 20 kHz.

3. The method of claim 1 , wherein generating the first motor-driving signal and the second motor-driving signal includes generating the audio signal component based on an audio signal.

4. The method of claim 3 , wherein generating the first motor-driving signal and the second motor-driving signal includes modulating a pulse signal with the audio signal.

5. The method of claim 4 , wherein the pulse signal is modulated with the audio signal using pulse-width modulation.

6. The method of claim 4 , further comprising receiving the audio signal from a main controller of the mobile platform.

7. The method of claim 4 , further comprising decoding an audio file and obtaining the audio signal from the decoded audio file.

8. The method of claim 1 , wherein the first motor-driving signal has a first direct-circuit (DC) component, the second motor-driving signal has a second DC component.

9. The method of claim 8 , further comprising:
adjusting a volume of the sound generated by the motor by adjusting the equilibrium position.

10. The method of claim 9 , wherein adjusting the volume of the sound includes adjusting the equilibrium position by adjusting at least one of the first DC component of the first motor-driving signal or the second DC component of the second motor-driving signal.

11. The method of claim 1 , further comprising amplifying the sound by vibrating a motor casing that at least partially encloses the rotor.

12. The method of claim 1 , wherein the first motor-driving signal and the second motor-driving signal drive the rotor to vibrate along a radial direction of the motor to generate the sound.

13. The method of claim 1 , wherein the first motor-driving signal and the second motor-driving signal further drive the motor to enable a mobile platform to move.

14. A system for generating sound, comprising:
a motor having a rotor;
a speaker; and
one or more processors configured to:
generate a first motor-driving signal for a first stator coil pair and a second motor-driving signal for a second stator coil pair;
apply the first motor-driving signal and the second motor-driving signal to the first stator coil pair and the second stator coil pair of the motor, respectively, to control a rotor of the motor to determine an equilibrium position corresponding to at least one of the first motor-driving signal or the second motor-driving signal, wherein the first motor-driving signal and the second motor-driving signal drive the rotor of the motor to vibrate relative to the equilibrium position to generate a sound corresponding to an audio signal component;
apply a bandpass filter to the first motor-driving signal and the second motor-driving signal to generate a first filtered motor-driving signal and a second filtered motor-driving signal, respectively; and
apply the first filtered motor-driving signal and the second filtered motor-driving signal to the speaker to present audio content consistent with the sound generated by the motor.

15. The system of claim 14 , wherein the first motor-driving signal and the second motor-driving signal are filtered by the bandpass filter to a bandwidth of 20 Hz to 20 kHz.

16. The system of claim 14 , wherein the motor is configured to enable a mobile platform to move.

17. The system of claim 14 , wherein the first motor-driving signal has a first direct-circuit (DC) component, the second motor-driving signal has a second DC component, and the one or more processors are further configured to adjust a volume of the sound generated by the motor by adjusting at least one of the first DC component of the first motor-driving signal or the second DC component of the second motor-driving signal.

18. A mobile platform, comprising:
a motor controller configured to generate a first motor-driving signal for a first stator coil pair and a second motor-driving signal for a second stator coil pair;
a speaker; and
a motor being coupled to the motor controller, the motor having a rotor;
wherein the motor controller is configured to:
apply the first motor-driving signal and the second motor-driving signal to the first stator coil pair and the second stator coil pair of the motor, respectively, to control a rotor of the motor to determine an equilibrium position corresponding to at least one of the first motor-driving signal or the second motor-driving signal, wherein the first motor-driving signal and the second motor-driving signal drive the rotor of the motor to vibrate relative to the equilibrium position to generate a sound corresponding to an audio signal component;
apply a bandpass filter to the first motor-driving signal and the second motor-driving signal to generate a first filtered motor-driving signal and a second filtered motor-driving signal, respectively; and
apply the first filtered motor-driving signal and the second filtered motor-driving signal to the speaker to present audio content consistent with the sound generated by the motor.

19. The mobile platform of claim 18 , wherein the motor is driven by the first motor-driving signal and the second motor-driving signal to generate the sound comprising oral content to convey warning or error message associated with an operation of the mobile platform.

20. The method of claim 1 , wherein:
an oscillating signal is superimposed on the first motor-driving signal, an inverted signal of the oscillating signal is superimposed on the second motor-driving signal;
the method further comprises:
applying the first motor-driving signal with the oscillating signal to the first stator coil pair of the motor and applying the second motor-driving signal with the inverted signal to the second stator coil pair of the motor to create an oscillating effective magnetic field, wherein the oscillating effective magnetic field drives the rotor of the motor to generate the sound corresponding to the audio signal component.

Assignees

• Sz Dji Technology Co Ltd

Inventors

• Lan Qiu
• Xiao Wenlong

Classifications

• B64U2201/00

  UAVs characterised by their flight controls · CPC title

• B64U50/19

  using electrically powered motors · CPC title

• G05B2219/23249

  Using audio and or video playback · CPC title

• G10K15/04

  Sound-producing devices (G10K15/02 takes precedence) · CPC title

• G10L19/00

  Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis (in musical instruments G10H) · CPC title