- 专利标题: Acoustic transducer aging compensation with life indicator
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申请号: US14465107申请日: 2014-08-21
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公开(公告)号: US09774967B2公开(公告)日: 2017-09-26
- 发明人: Richard J Lavery , Sean D Marvel
- 申请人: SYMBOL TECHNOLOGIES, INC.
- 申请人地址: US NY Holtsville
- 专利权人: Symbol Technologies, LLC
- 当前专利权人: Symbol Technologies, LLC
- 当前专利权人地址: US NY Holtsville
- 代理商 Yuri Astvatsaturov
- 主分类号: H04R29/00
- IPC分类号: H04R29/00 ; H04R3/00
摘要:
Acoustic transducer aging compensation is effective for an acoustic transducer that is driven with an adjustable drive power to output a signal. A microphone can measure the amplitude of the transmitted signal corresponding to a transmitted sound pressure level (SPL). A controller can periodically compare the transmitted SPL to the drive power or a previous SPL, and determine if the received SPL has declined with respect to the input drive power over time, whereupon the controller can direct an increase in drive power to the SPL-declined acoustic transducer to compensate for the decline in received SPL. If drive power is at a maximum, the controller can further instruct a mobile device receiver to lower its receiver detection threshold for the signal from the SPL-declined acoustic transducer to further compensate for the decline in SPL from that acoustic transducer. A life indicator can be provided to inform the system operator of the degraded speaker so as to provide an early warning indicator for servicing of that transducer.
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