Speaker adaptation with voltage-to-excursion conversion
US-2018160228-A1 · Jun 7, 2018 · US
Speaker excursion protection
US10674263B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-10674263-B1 |
| Application number | US-201916402509-A |
| Country | US |
| Kind code | B1 |
| Filing date | May 3, 2019 |
| Priority date | Dec 11, 2018 |
| Publication date | Jun 2, 2020 |
| Grant date | Jun 2, 2020 |
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Abstract
Official abstract text for this publication.
An audio circuit includes an amplifier, a voltage sensor, a current sensor, and an excursion control circuit. The voltage sensor is coupled to an output of the amplifier. The current sensor is coupled to the output of the amplifier. The excursion control circuit is coupled to the amplifier, the voltage sensor, and the current sensor. The excursion control circuit includes back electro-magnetic force (EMF) measurement, a back-EMF model, and excursion protection. The back-EMF measurement is to measure back electro-magnetic force of a speaker based on voltage measurements received from the voltage sensor and current measurements received from the current sensor. The back-EMF model is updated based on measurements of the back-EMF and is converted to an excursion model. The excursion protection is to limit amplitude of audio signal provided to the amplifier based on the excursion model of the speaker and amplitude of an audio input signal.
First claim
Opening claim text (preview).
What is claimed is: 1. An audio circuit, comprising: a speaker housing, comprising: a speaker; and a passive radiator or a bass reflex port; an amplifier coupled to the speaker; a voltage sensor coupled to the speaker; a current sensor coupled to the speaker; an excursion control circuit coupled to the amplifier, the voltage sensor, and the current sensor, the excursion control circuit comprising: back electro-magnetic force (EMF) measurement to measure back electro-magnetic force of the speaker based on voltage measurements received from the voltage sensor and current measurements received from the current sensor; a back-EMF model that is updated based on measurements of the back-EMF and is converted to an excursion model; and excursion protection to limit amplitude of audio signal provided to the amplifier based on the excursion model of the speaker and amplitude of an audio input signal; wherein the back-EMF model comprises: a second order filter to model back-EMF of the speaker; a fourth order filter to model back-EMF of the speaker with the passive radiator or the port; further comprising port detection to determine whether the bass reflex port is open based on voltage measurements received from the voltage sensor and current measurements received from the current sensor. 2. The audio circuit of claim 1 , wherein output of the fourth order filter is applied to estimate speaker excursion based on the bass reflex port being open, and output of the second order filter is applied to estimate speaker excursion based on the bass reflex port being closed. 3. An audio circuit, comprising: an amplifier; a voltage sensor coupled to an output of the amplifier; a current sensor coupled to the output of the amplifier; an excursion control circuit coupled to the amplifier, the voltage sensor, and the current sensor, the excursion control circuit comprising: back electro-magnetic force (EMF) measurement to measure back electro-magnetic force of a speaker based on voltage measurements received from the voltage sensor and current measurements received from the current sensor; a back-EMF model that is updated based on measurements of the back-EMF and is converted to an excursion model; and excursion protection to limit amplitude of audio signal provided to the amplifier based on the excursion model of the speaker and amplitude of an audio input signal; wherein the speaker back-EMF model comprises: a second order filter to model back-EMF of the speaker; a fourth order filter to model back-EMF of the speaker with a passive radiator or a bass reflex port; further comprising port detection to determine whether the bass reflex port is open based on voltage measurements received from the voltage sensor and current measurements received from the current sensor. 4. The audio circuit of claim 3 , wherein output of the fourth order filter is applied to estimate speaker excursion based on the bass reflex port being open, and output of the second order filter is applied to estimate speaker excursion based on the bass reflex port being closed.
Assignees
Inventors
Classifications
in amplifiers suitable for low-frequencies, e.g. audio amplifiers (H03G3/32, H03G3/34 take precedence) · CPC title
Low-frequency amplifiers, e.g. audio preamplifiers · CPC title
- H04R3/007Primary
Protection circuits for transducers · CPC title
for tone control and volume expansion or compression · CPC title
- H03G7/002Primary
in untuned or low-frequency amplifiers, e.g. audio amplifiers (H03G7/007, H03G7/001, H03G7/008, H03G7/02, H03G7/06 take precedence) · CPC title
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Frequently asked questions
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- What does patent US10674263B1 cover?
- An audio circuit includes an amplifier, a voltage sensor, a current sensor, and an excursion control circuit. The voltage sensor is coupled to an output of the amplifier. The current sensor is coupled to the output of the amplifier. The excursion control circuit is coupled to the amplifier, the voltage sensor, and the current sensor. The excursion control circuit includes back electro-magnetic …
- Who is the assignee on this patent?
- Texas Instruments Inc
- What technology area does this patent fall under?
- Primary CPC classification H04R3/007. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 02 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).