Title:
ＦＳＫ復調回路
Document Type and Number:
Japanese Patent JP5653791
Kind Code:
B2
Abstract:
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 value of the frequency detection signal, an amplitude determination part to determine if a size between peak values of sample values in front and rear of the inflection point exists in a first predetermined range, a preamble determination part to determine if a difference between initial and final sample values of at least one of a symbol having the extracted inflection point and a right before symbol exists in a second predetermined range, and an AND operation part to determine a normal inflection point.
Inventors:
羽深 貴光
Application Number:
JP2011033875A
Publication Date:
January 14, 2015
Filing Date:
February 18, 2011
Export Citation:
Assignee:
ラピスセミコンダクタ株式会社
International Classes:
H04L27/14
Attorney, Agent or Firm:
Toson Motohiko
Shigeyuki Nagaoka
Shinji Takano
Shigeyuki Nagaoka
Shinji Takano