Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
Embedded speaker protection for automotive audio power amplifier
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.
STMICROELECTRONICS (SHENZHEN) R&D CO. LTD
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Mei XianFeng Cristiano XiangSheng
Yang Xiong Meroni Li