Title: Concealed earphone detector and detection method thereof
Application Number: 200510136083 Application Date: 2005.12.31
Publication Number: 1880973 Publication Date: 2006.12.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01V3/12
Applicant(s) Name: Ling Zilong Address: 300072
Inventor(s) Name:
Attorney & Agent: jiang tianhua
Abstract:
     The invention discloses a stealth earphone detector and detecting method, which comprises the following parts: AF electromagnetic emission part, fixed-rate emission circuit, acoustic wave receiving part, frequency-selective acoustic control circuit and main control circuit, wherein the main control circuit controls one or more acoustic frequency electric signal from fixed-rate emission circuit, which drives acoustic electromagnetic wave to send and receive acoustic electromagnetic wave of coil; the electromagnetic wave can be reduced into same-frequency sound by electronic stealth earphone within certain scale; when the microphone picks up sound to excite the frequency-selective acoustic control circuit, the main control circuit judges according to input electric signal of frequency-selective acoustic control circuit due to certain degree acoustic radiation from earphone outsides for electronic stealth earphone.
Time: 8
<- Previous Patent:High resolution ratio static natu...   |  Next Patent:Housing for inspection system ->