|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||341/155 ; 455/130|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 7 인용 특허 : 3|
There is provided a quaternary FSK receiver which calculates an average of demodulated signals when a received quaternary FSK signal is converted into a quaternary digital signal, and the digital signal is entirely gradually increased or decreased in level so that the average is equal to a second reference value. This reduces influence exerted by fluctuation in a central value of the demodulated signal. The first and third reference values are varied in accordance with levels of "10 " and "00 " of the digital signal. Thus, it is possible to reduce sign e...
[ What is claimed is:] [1.]1. A quaternary FSK receiver comprising:(a) a receiver which receives quaternary FSK applied signals and converts the thus received quaternary FSK applied signals into demodulated signals;(b) an initial value generator which, when said demodulated signals have ideal amplitudes, generates first, second, third and fourth ideal values each corresponding to each of signs of a quaternary, and also generates a first reference value intermediate between said first ideal value and said second ideal value, a second reference value inter...