- Patent Title: Embedded speaker protection for automotive audio power amplifier
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Application No.: US14754861Application Date: 2015-06-30
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Publication No.: US09386372B2Publication Date: 2016-07-05
- Inventor: Xiangsheng Li , Cristiano Meroni , Mei Yang , Xian Feng Xiong
- Applicant: STMICROELECTRONICS (SHENZHEN) R&D CO., LTD. , STMICROELECTRONICS S.R.L.
- Applicant Address: CN Shenzhen IT Agrate Brianza (MB)
- Assignee: STMICROELECTRONICS (SHENZHEN) R&D CO. LTD.,STMICROELECTRONICS S.R.L.
- Current Assignee: STMICROELECTRONICS (SHENZHEN) R&D CO. LTD.,STMICROELECTRONICS S.R.L.
- Current Assignee Address: CN Shenzhen IT Agrate Brianza (MB)
- Agency: Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
- Priority: CN201110461473 20111230
- Main IPC: H03G11/00
- IPC: H03G11/00 ; H04R3/00 ; H03F1/52 ; H03G3/34 ; H03F3/21 ; H03F3/183 ; H04R1/00

Abstract:
A method of operating a speaker system including a speaker coupled to an amplifier, and a dedicated digital speaker protection circuit includes turning on the amplifier in a mute mode, after a first delay period, issuing a play command to the amplifier to place the amplifier in a play mode, but without an input signal during a second delay period, and performing a speaker offset detection during the second delay period, wherein, if there is an offset, then the amplifier is forced back into the mute mode, and if there is no offset, then the amplifier is allowed to continue to operate in the play mode. The method also includes issuing a speaker protection control signal or command if an offset is detected.
Public/Granted literature
- US20150304773A1 EMBEDDED SPEAKER PROTECTION FOR AUTOMOTIVE AUDIO POWER AMPLIFIER Public/Granted day:2015-10-22
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