Multiplex communications – Wide area network – Packet switching
Patent
1992-04-22
1993-11-23
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
379283, 34082548, H04L 2726
Patent
active
052650979
ABSTRACT:
A data processor comprises a multifrequency receiver formed together with a central processor on a semiconductor substrate. The multifrequency receiver produces digital data for identifying a tone wave included in a multifrequency analog signal or produces an identification result in accordance with the condition or signal issued by the central processor. The multifrequency receiver is thereby operative to deal with tone waves which are flexible in type and input analog signals which are flexible in their frequency band, and has increased latitude of choice for the operational characteristics and function such as the number of sampling periods of input analog signals and the discrimination accuracy.
REFERENCES:
patent: 4016370 (1977-04-01), Laoteppitaks et al.
Funatsu Kenzo
Ito Takashi
Kubomura Chiaki
Kuboyama Keiji
Yashiki Naoki
Chin Wellington
Hitachi , Ltd.
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