Harman International Industries, Inc.

Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Sean Gao

Li Yang

Robert Maleika

Ruijing Guo

Alan Michel

Guangyue Lv

Lily Ren

Philippe Jeantin

Jean Paul Rodrigues

The present invention relates to a polycarbonate composite having an increased pencil hardness, comprising a polycarbonate substrate prepared from a thermoplastic aromatic (co)polycarbonate having a glass-transition temperature in the range of 160 to 210&#xb0; C.; and a coating on said substrate, said coating being formed by curing a polysiloxane-based thermosetting coating material at a temperature in the range of 140 to 210&#xb0; C. for 0.5 to 2 hours. The polycarbonate composite has a pencil hardness higher than H, as measured according to ASTM D3363. The present invention also relates to a method for producing said polycarbonate composite and an article comprising the same.

Polycarbonate composite having an increased pencil hardness

An electret condenser microphone is provided. The electret condenser microphone comprises a diaphragm, a backplate with a metal layer on the side facing the diaphragm and an amplifier on the other side, the input of the amplifier electrically connecting the metal layer, a spacer separating the diaphragm and the backplate PWB; and a metal sleeve accommodating the diaphragm, the backplate and the spacer.

Electret condenser microphone and manufacturing method thereof

The present disclosure provides a microphone including a main body, where an audio signal is generated in the main body based on the sound level and some other properties received, and an amplifier disposed in the main body, where the amplifier is adapted to amplify the audio signal, with the amplifier able to be configured with multiple gain levels. The present disclosure further provides a method for processing audio signals including: acquiring an audio signal; selecting a gain from multiple gain levels of an amplifier based on a property of the acquired audio signal, where the amplifier is built in a main body of a microphone; and modifying the digital representation after analog to digital conversion of the acquired audio signal according to the selected gain.

Microphone and method for processing audio signals

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Shanghai, China

Sean Gao