|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||H03H-007/28 H03D-003/18 H03H-007/15 H03H-007/50|
|미국특허분류(USC)||333/70A ; 307/229 ; 307/240 ; 329/50|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 5 인용 특허 : 0|
In the synchronous detection signals of frequency Fo immersed in a noise, an auxiliary signal is produced having a period ½Fo and in the form of a rectified symmetrical wave, by rectifying a symmetrical wave of period 1/Fo. The signal to be filtered is multiplied by the auxiliary signal and synchronous filtering or synchronous detection on the frequency Fo is performed on the signal obtained after the above-mentioned multiplication. Preferably the auxiliary signal is produced in the form of a rectified sinusoidal wave and a square wave reference signal f...
A method of processing an alternating electric signal of an assigned frequency Fo, comprising the steps of: producing first and second symmetrical reference electrical waves having the frequency Fo and the period 1/Fo and mutually coherent in phase, said first reference wave being a non-rectangular wave and said second reference wave being a rectangular wave; producing an auxiliary signal having the period ½Fo by rectifying said first reference wave; multiplying the signal to be processed by said auxiliary signal in an electronic multiplier; And isosynch...