Apparatus for detecting a distance and apparatus for...

Details Apparatus for detecting a distance and apparatus for... Apparatus for detecting a distance and apparatus for...

2004-12-07

2009-02-24

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S150000, C375S219000, C375S316000, C375S343000, C342S02500R, C342S131000

Reexamination Certificate

active

07496157

ABSTRACT:
In an apparatus for detecting a distance and improving the SN ratio of received signals, an angular frequency (ω1) of sinusoidal wave signals generated by a sinusoidal wave generator is brought into synchronism with an angular frequency (ω) of burst pulse signals, and signals received by a transmitter/receiver microphone are orthogonally demodulated by using sinusoidal wave signals of the synchronized angular frequency. A microcomputer adds up the vectors of the demodulated signals for only a period of time equal to a section of transmitting the transmission waves from the transmitter/receiver microphone. A distance to a body is detected by using the received signals of which the vectors are added up.

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