公开(公告)号：BR8106698A

公开(公告)日：1981-12-22

申请号：BR8106698

申请日：1981-01-08

Applicant: MOTOROLA INC

Inventor： LABEDZ G

IPC: H03H17/00 ,  G06F17/10 ,  G06F17/15 ,  H03D3/00 ,  H03G3/00 ,  H04W88/02 ,  G06F15/20

Abstract: Method and apparatus for sampling input signals of different frequencies and providing a detect signal when the input frequency has a predetermined value suitable for use as a tone decoder for continuous tone controlled squelch systems. The method utilizes digital pseudo continuous correlation tone detection, and includes sample matrix limiting to provide rapid reverse burst turnoff, as well as background detection to avoid adjacent channel reverse burst turnoff falsing.

公开(公告)号：WO1981002353A1

公开(公告)日：1981-08-20

申请号：PCT/US1981000028

申请日：1981-01-08

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  LABEDZ G

IPC: G06F15/31

CPC classification number: H04W88/027 ,  H03D3/00 ,  H03G3/005

Abstract: Method and apparatus (Fig. 1) for sampling input signals (20) of different frequencies and providing a detect signal when the input frequency has a predetermined value suitable for use as a tone decoder for continuous tone controlled squelch systems. The method utilizes digital pseudo continuous correlation tone detection, and includes sample matrix limiting (26 and 28) to provide rapid reverse burst turnoff, as well as background detection to avoid adjacent channel reverse burst turnoff falsing.