Title:
RECEIVER
Document Type and Number:
Japanese Patent JP2019047182
Kind Code:
A
Abstract:
To provide a receiver which allows for demodulation of a signal, subjected to MSK modulation at a predetermined first frequency and a second frequency of 1.5 times of the first frequency, by setting a reception transmission speed corresponding to the lowest common multiple of the first and second frequencies.SOLUTION: A demodulation section converts demodulation signals, obtained from received radio signals by FM demodulation, into a bit string 70 at the sampling rate of reception transmission speed 3600bps becoming the lowest common multiple of the first frequency 1200 Hz and the second frequency 1800 Hz, a bit determination section divides the demodulated bit string 70 into groups of 3 bit unit, selects the group in order from the beginning, extracts the first bit (n), the third bit (n+2), excepting the undefined second bit of the selection group, and the bit string 72 of 3 bits of the first bit (n+3) of the next group, determines the bit of the original data corresponding to the selection group as bit 1 in the case of 101 or 010 as shown in the determination results 74, and determines as bit 0 in the case where the 3 bits are 001 or 110.SELECTED DRAWING: Figure 4
Inventors:
NAKAJIMA YOSHITO
MORIKI DAIKI
SHIMA YASUSHI
MORIKI DAIKI
SHIMA YASUSHI
Application Number:
JP2017165277A
Publication Date:
March 22, 2019
Filing Date:
August 30, 2017
Export Citation:
Assignee:
HOCHIKI CO
International Classes:
H04L27/14; H04B1/16; H04B14/00
Domestic Patent References:
| JPH06261080A | 1994-09-16 | |||
| JPH08237311A | 1996-09-13 | |||
| JPH04111754A | 1992-04-13 | |||
| JP2013029944A | 2013-02-07 | |||
| JP2008508764A | 2008-03-21 | |||
| JP2009117922A | 2009-05-28 |
Foreign References:
| US5583890A | 1996-12-10 |
Attorney, Agent or Firm:
Susumu Takeuchi