公开(公告)号：US10908670B2

公开(公告)日：2021-02-02

申请号：US16337300

申请日：2017-09-26

Applicant: Dolphin Integration

Inventor： Emmanuel Grand

IPC: G10L15/20 ,  G06F1/3234 ,  G10L25/78 ,  G06F1/3206 ,  G06F1/3287 ,  H03G3/30 ,  H03G3/34 ,  G10L15/28 ,  G10L25/93 ,  G10L25/87

Abstract: A circuit for sound activity detection includes a transducer (106) adapted to generate an electrical signal based on detected sound; a variable gain amplifier adapted to amplify the electrical signal to generate an amplified electrical signal; a comparator adapted to compare the amplified electrical signal with at least one first threshold level to generate a comparison signal indicating comparator events; and a control circuit adapted to generate, based on the comparison signal, a gain control signal for controlling the gain of the variable gain amplifier, and a sound activity alert signal indicating the detection of sound activity.

公开(公告)号：US09641134B2

公开(公告)日：2017-05-02

申请号：US14832910

申请日：2015-08-21

Applicant: Dolphin Integration

Inventor： Emmanuel Grand ,  Sébastien Genevey ,  Arthur Veith ,  Paul Giletti

IPC: H03F3/45 ,  H03F1/26 ,  H03F3/185 ,  H03F1/30

CPC classification number: H03F1/26 ,  H03F1/305 ,  H03F3/185 ,  H03F3/45179 ,  H03F2200/03 ,  H03F2200/129

Abstract: The invention concerns an amplifier circuit comprising: an amplifier having a first input coupled to an input node of the amplifier circuit via a first resistor and an output coupled to a load via a coupling capacitor, the output being coupled to the first input via a second resistor; and a current ramp generator adapted to supply a current ramp to the first input of the amplifier during a power up phase or power down phase of the amplifier circuit to control the rate of charge or discharge of the coupling capacitor.