Title:
SOUND FIELD PERCEPTION-BASED LOW-POWER ACOUSTIC PROXIMITY ALARM APPARATUS AND ALARM METHOD
Document Type and Number:
WIPO Patent Application WO/2022/057240
Kind Code:
A1
Abstract:
A sound field perception-based low-power acoustic proximity alarm apparatus and an alarm method. Said alarm apparatus comprises: a loudspeaker (1), a sound pressure sensor (2), a pre-amplifier (3), a phase correction unit (4), and a power amplifier (5). The sound pressure sensor (2) is mounted on a vibrating diaphragm of the loudspeaker (1) and is used for acquiring mechanical vibration of the vibrating diaphragm of the loudspeaker (1). An output signal of the sound pressure sensor (2) is connected to the input end of the pre-amplifier (3). A signal outputted by the pre-amplifier (3) is corrected by the phase correction unit (4) and then serves as an input of the power amplifier (5). The output end of the power amplifier (5) is connected to the input of the loudspeaker (1). The values of a gain A of the pre-amplifier (3) and a phase shift amount △p of the phase correction unit (4) are such that the gain A takes a maximum value in a case where self-excitation does not occur in the alarm apparatus. There is no need to send a detection sound wave when no target is approaching, resulting in extremely low power consumption; therefore, the present invention can be used in an occasion sensitive to power consumption and requiring a long time to monitor.
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Inventors:
HE CHENG (CN)
BI XUEJIE (CN)
LI XIAOMAN (CN)
MA LIN (CN)
WU YOU (CN)
LUO CHENGMING (CN)
WANG BIAO (CN)
NIE XINGYANG (CN)
ZHENG WEI (CN)
BI XUEJIE (CN)
LI XIAOMAN (CN)
MA LIN (CN)
WU YOU (CN)
LUO CHENGMING (CN)
WANG BIAO (CN)
NIE XINGYANG (CN)
ZHENG WEI (CN)
Application Number:
PCT/CN2021/085758
Publication Date:
March 24, 2022
Filing Date:
April 07, 2021
Export Citation:
Assignee:
UNIV JIANGSU SCIENCE & TECH (CN)
International Classes:
G08B3/10; G08B13/16
Domestic Patent References:
| WO2002017586A1 | 2002-02-28 |
Foreign References:
| CN112150742A | 2020-12-29 | |||
| CN103318080A | 2013-09-25 | |||
| CN102390355A | 2012-03-28 | |||
| CN2042220U | 1989-08-02 | |||
| CN203786851U | 2014-08-20 | |||
| CN2248347Y | 1997-02-26 | |||
| EP0764915B1 | 2001-01-24 | |||
| US6411979B1 | 2002-06-25 |
Other References:
"Analog Electronic Technology Fundamentals", 31 August 2011, CN, ISBN: 978-7-5603-1216-3, article LIN, YUJIANG: "Passage; Analog Electronic Technology Fundamentals", pages: 157 - 159, XP009536042
Attorney, Agent or Firm:
NANJING SUGAO PATENT AND TRADEMARK FIRM (ORDINARY PARTNERSHIP) (CN)
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