Patent ID: 11875769
Assignee: nan
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A baby monitor system with noise filtering comprises a camera unit and a monitor unit, the camera unit comprises a voice detection module, the monitor unit comprises a Digital Signal Processing (DSP) processor with Environmental Noise Cancellation (ENC) module and filters;
the voice detection module detects target signals from baby and ambient noise signals to form audio streaming data, and transmits the audio streaming data to the monitor unit in encrypted format;
the monitor unit converts the audio streaming data to analog signals and passes the analog signals to input of ENC module of the DSP processor;
the ENC module identifies the noise signals and target signals from the analog signals, and activates the filters to filter the noise signals according to frequency bands of noise for attenuating noise sound and to pass the target signals with signal amplification for improving target sound;
wherein the ambient noise signals include more than one noise and different noises are according to different frequency bands, and the filters are used to filter the noises in identified frequency bands;
wherein the camera unit further includes a single microphone and the monitor unit further includes a microcontroller (MCU); wherein the audio streaming data is transmitted from the output of the single microphone and fed into two audio input ports of the ENC module through the MCU, so that the ENC module receives two audio input signals with the ambient noise signals; when voltage level of a control pin to ENC module is set to ground, the ENC module is activated, and in active state, the ENC module identifies the frequency bands of noise by using auto-correlation function between the two audio input signals and activates the filter to filter the noises in identified frequency bands.