Granted Patent B2

US 12,587,800 · App. 18/442,521 · Granted Mar 24, 2026

Inventors: Henrik Dunér (Lund, SE); Susanne Dunér (Lund, SE)

Assignee: AXIS AB

H04R29/004H04R1/083

Abstract

Claims (31)

1 . A method for determining a status of a microphone, the method comprising:

registering an audio signal from the microphone and providing the audio signal to an audio signal receiver;

providing, while registering the audio signal from the microphone and while providing the audio signal to an audio signal receiver, a temporary replacement audio signal to the audio signal receiver;

transmitting a predetermined impulse waveform to a piezoelectric component, the piezoelectric component being located in a vicinity of the microphone and arranged in mechanical connection with the microphone, to induce a mechanical impulse in the piezoelectric component;

determining whether a response signal waveform from the microphone corresponds to the predetermined impulse waveform;

resuming the provision of the audio signal to the audio signal receiver, and

upon the response signal waveform from the microphone corresponding to the predetermined impulse waveform, determining that the status of the microphone is operational.

2 . The method of claim 1 , wherein determining whether a response signal waveform from the microphone corresponds to the predetermined impulse waveform comprises:

determining that a timing difference between the response signal waveform and the predetermined impulse waveform is within a predetermined timing difference interval.

3 . The method of claim 1 , wherein the predetermined impulse waveform comprises an encoded pattern, and wherein determining whether a response signal waveform from the microphone corresponds to the predetermined impulse waveform comprises

determining that the response signal waveform comprises the encoded pattern.

4 . The method of claim 3 , wherein the encoded pattern is a sequence of a predetermined number of impulses delimited by a respective predetermined time interval.

5 . The method of claim 1 , wherein the predetermined impulse waveform comprises a square waveform.

6 . The method of claim 1 , wherein the temporary replacement audio signal is a computed extrapolation or interpolation of the audio signal provided to the audio signal receiver prior to the initiation of provision of the temporary replacement audio signal.

7 . The method of claim 1 , wherein the temporary replacement audio signal is a difference audio signal computed by subtracting a predetermined response signal waveform from the response signal waveform from the microphone.

8 . A non-transitory computer-readable storage medium having stored thereon instructions for implementing a method for determining a status of a microphone, when executed on a device having processing capabilities, the method comprising:

registering an audio signal from the microphone and providing the audio signal to an audio signal receiver;

providing, while registering the audio signal from the microphone and while providing the audio signal to an audio signal receiver, a temporary replacement audio signal to the audio signal receiver;

transmitting a predetermined impulse waveform to a piezoelectric component, the piezoelectric component being located in a vicinity of the microphone and arranged in mechanical connection with the microphone, to induce a mechanical impulse in the piezoelectric component;

determining whether a response signal waveform from the microphone corresponds to the predetermined impulse waveform;

resuming the provision of the audio signal to the audio signal receiver, and

upon the response signal waveform from the microphone corresponding to the predetermined impulse waveform, determining that the status of the microphone is operational.

9 . A device comprising circuitry, a microphone and a piezoelectric component, the piezoelectric component and the microphone being located in a vicinity of and in mechanical connection with each other, the circuitry being connected to the microphone and connected to the piezoelectric component, where the circuitry is configured to execute:

registering of an audio signal from the microphone and providing the audio signal to an audio signal receiver;

provision, while registering the audio signal from the microphone and while providing the audio signal to an audio signal receiver, of a temporary replacement audio signal to the audio signal receiver;

a transmitting function configured to transmit a predetermined impulse waveform to the piezoelectric component to induce a mechanical impulse in the piezoelectric component;

a response determining function configured to determine whether a response signal waveform from the microphone corresponds to the predetermined impulse waveform;

resumption of the provision of the audio signal to the audio signal receiver, and

upon the response signal waveform from the microphone corresponding to the predetermined impulse waveform, determine that the status of the microphone is operational.

10 . The device of claim 9 , where the piezoelectric component is any of a multi-layer ceramic capacitor, MLCC, and a piezoelectric actuator made of lead zirconate titanate PZT.

11 . The device of claim 9 , comprising a printed circuit board, PCB, and where the microphone and the piezoelectric component are both attached to the PCB in the vicinity of each other.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (10)