Power limiter configuration for audio signals

Patent metadata

Field	Value
Publication number	US-11146219-B2
Application number	US-201916721811-A
Country	US
Kind code	B2
Filing date	Dec 19, 2019
Priority date	Feb 4, 2019
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

Example embodiments provide a process that includes one or more of receiving an audio signal at a feedback compressor circuit, receiving an auxiliary attenuation signal from an auxiliary attenuation source, determining a threshold power level based on a value of the auxiliary attenuation signal, determining an output power level of the audio signal exceeds the threshold power level, combining the audio signal with the auxiliary attenuation signal from the auxiliary attenuation source and a compressed attenuation signal from the feedback compressor circuit to create a combination signal, and generating an audio output signal of the feedback compressor circuit based on the combination signal.

First claim

What is claimed is:

1. A method comprising:
receiving an audio signal at a feedback compressor circuit;
receiving an auxiliary attenuation signal from an auxiliary attenuation source;
determining a threshold power level based on a value of the auxiliary attenuation signal;
determining an output power level of the audio signal exceeds the threshold power level;
combining the audio signal with the auxiliary attenuation signal from the auxiliary attenuation source and a compressed attenuation signal from the feedback compressor circuit to create a combination signal;
dynamically adjusting a value of a low pass filter (LPF) based on a change to the threshold power level;
filtering the audio output signal via the low pass filter (LPF);
combining the filtered audio output signal with the auxiliary attenuation signal and the compressed attenuation signal to create the combination signal; and
combining the combination signal with the audio signal to create an audio output signal.

2. The method of claim 1 , comprising:
performing a logarithmic conversion to the filtered audio signal prior to combining the filtered audio signal with the auxiliary attenuation signal.

3. The method of claim 1 , comprising:
performing an antilogarithmic conversion to the combination signal prior to combining the combination signal with the audio signal.

4. The method of claim 1 , wherein the auxiliary attenuation signal comprises a composite of attenuation signals received from a plurality of sensors configured to generate one or more of an excessive heat signal, an excessive output current signal and a power supply voltage sag signal.

5. An apparatus comprising:
a receiver configured to
receive an audio signal at a feedback compressor circuit;
receive an auxiliary attenuation signal from an auxiliary attenuation source; and

a processor configured to
determine a threshold power level based on a value of the auxiliary attenuation signal;
determine an output power level of the audio signal exceeds the threshold power level;
combine the audio signal with the auxiliary attenuation signal from the auxiliary attenuation source and a compressed attenuation signal from the feedback compressor circuit to create a combination signal;
dynamically adjust a value of a low pass filter (LPF) based on a change to the threshold power level;
filter the audio output signal via the low pass filter (LPF);
combine the filtered audio output signal with the auxiliary attenuation signal and the compressed attenuation signal to create the combination signal; and
combine the combination signal with the audio signal to create an audio output signal.

6. The apparatus of claim 5 , wherein the processor is further configured to
perform a logarithmic conversion to the filtered audio signal prior to combining the filtered audio signal with the auxiliary attenuation signal.

7. The apparatus of claim 6 , wherein the processor is further configured to
perform an antilogarithmic conversion to the combination signal prior to combining the combination signal with the audio signal.

8. The apparatus of claim 5 , wherein the auxiliary attenuation signal comprises a composite of attenuation signals received from a plurality of sensors configured to generate one or more of an excessive heat signal, an excessive output current signal and a power supply voltage sag signal.

9. A non-transitory computer readable storage medium configured to store instructions that when executed cause a processor to perform:
receiving an audio signal at a feedback compressor circuit;
receiving an auxiliary attenuation signal from an auxiliary attenuation source;
determining a threshold power level based on a value of the auxiliary attenuation signal;
determining an output power level of the audio signal exceeds the threshold power level;
combining the audio signal with the auxiliary attenuation signal from the auxiliary attenuation source and a compressed attenuation signal from the feedback compressor circuit to create a combination signal;
dynamically adjusting a value of a low pass filter (LPF) based on a change to the threshold power level;
filtering the audio output signal via the low pass filter (LPF);
combining the filtered audio output signal with the auxiliary attenuation signal and the compressed attenuation signal to create the combination signal; and
combining the combination signal with the audio signal to create an audio output signal.

10. The non-transitory computer readable storage medium of claim 9 , wherein the processor is further configured to perform:
performing a logarithmic conversion to the filtered audio signal prior to combining the filtered audio signal with the auxiliary attenuation signal.

11. The non-transitory computer readable storage medium of claim 9 , wherein the processor is further configured to perform:
performing an antilogarithmic conversion to the combination signal prior to combining the combination signal with the audio signal.

Assignees

• Biamp Sys Llc

Inventors

• Faulstich Aaron

Classifications

• H04R3/007 Primary

  Protection circuits for transducers · CPC title

• H03G11/008

  of digital or coded signals · CPC title

• H03G7/007

  of digital or coded signals · CPC title

• H03G3/3005

  in amplifiers suitable for low-frequencies, e.g. audio amplifiers (H03G3/32, H03G3/34 take precedence) · CPC title

• H03G2201/106

  being attenuating element · CPC title