In the preferred embodiment, the supplied tone reference signal is equal to sin 2 π t (f c), where t is the time in seconds. The main correlator 12 is designed to correlate to a center frequency f c as determined by a tone reference signal that is applied at its input 20.

1, it will be understood that the tone decoder 10 includes a tone signal input 11 which supplies the tone signal to a main correlator 12 and side correlators 13 and 14. Referring now by characters of reference to the drawings and first to FIG. H04W88/027- Selective call decoders using frequency address codes.terminals, base stations or access point devices H04W88/00- Devices specially adapted for wireless communication networks, e.g.238000001514 detection method Methods 0.000 claims abstract description 3.Application granted granted Critical Publication of US4769610A publication Critical patent/US4769610A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Motorola Inc filed Critical Motorola Inc Priority to US07/067,750 priority Critical patent/US4769610A/en Assigned to MOTOROLA, INC. Original Assignee Motorola Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Weiss Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/067,750 Inventor Karl R. Google Patents US4769610A - Tone decoderĭownload PDF Info Publication number US4769610A US4769610A US07/067,750 US6775087A US4769610A US 4769610 A US4769610 A US 4769610A US 6775087 A US6775087 A US 6775087A US 4769610 A US4769610 A US 4769610A Authority US United States Prior art keywords tone frequency correlator correlators detecting Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

Selective call tone decoder