Method for detecting warning signal in changing environment

• Main Authors: HUTCHINGS JEFFREY L, IYER APARNA, KREIFELDT, RICHARD, A
• Format: Patent
• Language: Chinese; English
• Published: 03.10.2023
• Subjects: ACOUSTICS; DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; MUSICAL INSTRUMENTS; PHYSICS; PUBLIC ADDRESS SYSTEMS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

In an audio system, an audio signal is pre-processed to provide input signals to a fast detector and a slow detector, the input signals including an alert signal and ambient sound. The slow detector determines an ambient sound level of the input signal that is output to an alert signal detector. The alert signal detector uses the ambient sound level to calculate an adaptive threshold level using an adaptive threshold function. The fast detector determines an envelope level of the input signal that is output to the alert signal detector. The alert signal detector compares the envelope level to the adaptive threshold level to determine whether an alert signal is present in the input signal. The adaptive threshold level varies as a function of the ambient sound level of the input signal, and the alert signal detection of the audio system is automatically adapted to an acoustic environment having different changes in ambient sound levels. 在音频系统中，音频信号被预先处理以向快速检测器和慢速检测器提供输入信号，所述输入信号包括警戒信号和环境声。所述慢检测器确定被输出到警戒信号检测器的所述