Sound signal processing apparatus
US-9497543-B2 · Nov 15, 2016 · US
Pop/click noise reduction circuitry for power-up and power-down of audio output circuitry
US9020165B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9020165-B2 |
| Application number | US-201213647897-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 9, 2012 |
| Priority date | Oct 9, 2012 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
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Abstract
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Pop/clock noise reduction circuitry is disclosed for audio output circuitry. After audio output circuitry is enabled, reference voltage generator circuitry is then enabled to produce a reference voltage that ramps from a first voltage level to a second voltage level at a smooth rate. The ramping reference voltage is applied to the input of the audio output circuitry to reduce or prevent pop/click noise for the audio output circuitry. Further, negative offset control circuitry can also be used to provide a negative offset input to the audio output circuitry to remove initial step-up voltage levels that may exist at operational power-up for the audio output circuitry. Still further, current control circuitry can also be used that limits the available current flowing to the output node for the audio output circuitry, thereby further reducing and/or preventing potential pop/click noise in the audio output signals.
First claim
Opening claim text (preview).
What is claimed is: 1. Audio output circuitry, comprising: a reference voltage generator circuitry configured to output a reference voltage that rises from a first voltage level to a second voltage level after a reference enable signal is asserted; amplifier circuitry configured to produce an amplified audio output signal based upon a combination of an audio input signal and the reference voltage, the audio output circuitry being further configured to power-up based upon asserti…
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Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9020165B2 cover?
- Pop/clock noise reduction circuitry is disclosed for audio output circuitry. After audio output circuitry is enabled, reference voltage generator circuitry is then enabled to produce a reference voltage that ramps from a first voltage level to a second voltage level at a smooth rate. The ramping reference voltage is applied to the input of the audio output circuitry to reduce or prevent pop/cli…
- Who is the assignee on this patent?
- Silicon Lab Inc
- What technology area does this patent fall under?
- Primary CPC classification H03G3/348. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 28 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).