SE8404304D0 - RADIO RECEIVER - Google Patents

RADIO RECEIVER

Info

Publication number
SE8404304D0
SE8404304D0 SE8404304A SE8404304A SE8404304D0 SE 8404304 D0 SE8404304 D0 SE 8404304D0 SE 8404304 A SE8404304 A SE 8404304A SE 8404304 A SE8404304 A SE 8404304A SE 8404304 D0 SE8404304 D0 SE 8404304D0
Authority
SE
Sweden
Prior art keywords
frequency
mixer
frequencies
local oscillator
receiver
Prior art date
Application number
SE8404304A
Other languages
Swedish (sv)
Other versions
SE8404304L (en
Inventor
P E Chadwick
P A K Moon
Original Assignee
Plessey Overseas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plessey Overseas filed Critical Plessey Overseas
Publication of SE8404304D0 publication Critical patent/SE8404304D0/en
Publication of SE8404304L publication Critical patent/SE8404304L/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
    • H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements

Abstract

The receiver has a mixer (2) which receives the transmission frequencies (f and f+ DELTA f). A local oscillator (3) feeds a mixing signal to the mixer (2) and is switchable between two frequencies neither of which lies midway between the two transmission frequencies, the switching being controlled by the output. The low or band mass filtered signal to detector 8 thus comprises one of four frequencies which fall in respective upper and lower bands, which bands are distinguished by the detector to provide the binary output at (7). The local oscillator frequency is switched to its alternative frequency either when an upper band frequency is detected or alternatively in the absence of such a frequency. The receiver thus requires only one filter, and one mixer, with no quadrature local oscillator. <IMAGE>
SE8404304A 1983-09-14 1984-08-29 RADIORECEIVER SE8404304L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08324666A GB2146876B (en) 1983-09-14 1983-09-14 Fsk radio receiver

Publications (2)

Publication Number Publication Date
SE8404304D0 true SE8404304D0 (en) 1984-08-29
SE8404304L SE8404304L (en) 1985-03-15

Family

ID=10548800

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8404304A SE8404304L (en) 1983-09-14 1984-08-29 RADIORECEIVER

Country Status (5)

Country Link
JP (1) JPS6085651A (en)
DE (1) DE3431731A1 (en)
FR (1) FR2551937A1 (en)
GB (1) GB2146876B (en)
SE (1) SE8404304L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298256A (en) * 1986-06-18 1987-12-25 Nec Corp Receiver for frequency shift modulation signal
US5414736A (en) * 1991-08-12 1995-05-09 Matsushita Electric Industrial Co., Ltd. FSK data receiving system
GB9603660D0 (en) * 1996-02-21 1996-04-17 Cedardell Ltd Fm detection apparatus and method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB628210A (en) * 1947-09-17 1949-08-24 Ralph Francis Hill Improvements in wireless receiving systems for carrier shift telegraphy
DE947986C (en) * 1954-01-19 1956-08-23 Siemens Ag Circuit arrangement for automatic frequency adjustment of a receiver for receiving frequency-shift keyed telegraphic transmissions
DE1020691B (en) * 1956-09-15 1957-12-12 Rohde & Schwarz Frequency control in receivers for frequency shift keyed broadcasts
DE2132564C3 (en) * 1971-06-30 1978-05-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Circuit arrangement for level monitoring
GB2076238B (en) * 1980-05-16 1983-11-30 Plessey Co Ltd Radio receiver
GB2086158B (en) * 1980-08-23 1984-05-02 Plessey Co Ltd Radio receiver
GB2109201B (en) * 1981-10-26 1985-03-27 Philips Electronic Associated Direct modulation fm receiver

Also Published As

Publication number Publication date
GB8324666D0 (en) 1983-10-19
FR2551937A1 (en) 1985-03-15
GB2146876A (en) 1985-04-24
GB2146876B (en) 1987-03-04
SE8404304L (en) 1985-03-15
JPS6085651A (en) 1985-05-15
DE3431731A1 (en) 1985-03-28

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