An FSK demodulator and a method for detecting an inflection point extract a greater amount of effective inflection points of a frequency detection signal while reducing erroneous detection of the inflection points. The inflection point detector includes an inflection point extraction part to extract the inflection point corresponding to variation of a sample value of an amplitude …

Legal parties

Inventors (applicants): Takamitsu Hafuka
Assignees (initial): Lapis Semiconductor Co., Ltd. JP
Agents: Studebaker & Brackett PC (attorney)

The application was examined by Joseph Chang (USPTO dept. 2817)


  • 1. A Frequency Shift Keying (FSK) demodulator comprising: …
  • 2. The FSK demodulator of claim 1 , wherein the inflection point extraction part includes …
  • 3. The FSK demodulator of claim 2 , wherein the preamble determination part comprises: a first …

International priority data

JP: 2011-033875 / Feb. 18, 2011 (national)

Cited documents


  • JP 2006-325127 A, Nov. 1, 2006
  • Yamada US 8199860 B2 / 375/326, Jun. 1, 2012
  • Akahori US 7715500 B2 / 375/334, May. 1, 2010
  • Lee et al. US 5818296 A / 329/300, Oct. 1, 1998
  • Wang et al. US 7664205 B2 / 375/334, Feb. 1, 2010


Brief Description of the Drawings

FIG. 1 is a block diagram schematically showing the structure of a conventional FSK demodulator; FIG. 2 is a block diagram showing the structure of a frequency offset cancellation circuit …


Background of the Invention

1. Technical Field The present invention relates to an FSK (Frequency Shift Keying) receiver. More particularly, the present invention relates to an FSK demodulator of an FSK receiver. 2. Description …

Detailed Description of the Embodiments

Hereinafter, embodiments of the present invention will be described in detail with reference to accompanying drawings. FIG. 5 is a block diagram showing the structure of an inflector point detector …

More details about FSK Demodulator

Miscellaneous patent data

Invented by Takamitsu Hafuka, the invention details are shown in 9 figures, the grant number is 08519784 (publication number), the inventor's name is Hafuka Takamitsu, the patent is illustrated by 6 drawings, was examined by Joseph Chang, the main examiner (2817 USPTO department), the patent particularly claims a Frequency Shift Keying (FSK) demodulator comprising…, the grant date is Aug. 27, 2013 (publication date), the assignee is a foreign company or corporation, the patent extension term is 16 days, the known applicant's name is Takamitsu Hafuka, the recorded agent's organization is Studebaker & Brackett PC, the invention is named FSK Demodulator, claims 1-12 comprise the invention scope, similar classification categories are provision for preventing undesired type of demodulation, e.g. preventing anode detection in a grid detection circuit, Input signal split into plural signals, Balanced arrangements, Frequency Modulation Demodulator, angle-modulated oscillations, Including discrete semiconductor device, Homodyne or synchrodyne circuits, Including microwave or distributed parameter structure, Transference of modulation using distributed inductance and capacitance, Including signal passed through single demodulating path including resonant circuit, the primary classification Including logic element (e.g., logic gate or flip-flop has been designated to the document, the recorded assignee organization is Lapis Semiconductor Co., Ltd., numbered 13/398,758 (application), the application publication date is Feb. 16, 2012, the exemplary claims include number 1, includes the following drawings: Block diagram showing the structure, FSK Demodulator, Block diagram showing the structure, Block diagram schematically showing the structure.

Invention classification information

The invention is classified under Demodulator circuits, Receiver circuits, Including logic element (e.g., logic gate or flip-flop, Frequency shift keying, Demodulation of angle-modulated oscillations. The designated search classifications include Including logic element (e.g., logic gate or flip-flop, Frequency shift keying.

Patent details
Publication number 08519784
Publication date Aug. 27, 2013
Kind code B2
Application number 13/398,758
Application date Feb. 16, 2012
Application type U
Application series code 13
Extension term 16
National classification 329/303
Total number of claims 12
Exemplary claims 1
Number of drawings 6
Number of figures 9
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