Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – Having selection between plural continuous waveforms
Patent
1996-09-03
1999-03-23
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
Having selection between plural continuous waveforms
348705, H03K 1900, H04N 5268
Patent
active
058865454
ABSTRACT:
An input signal from a Dsub connector and BNC connectors is selected by an analog switch. The frequency of horizontal and vertical synchronizing signals applied from one connector end is measured by a synchronizing frequency detection circuit. The frequencies of horizontal and vertical synchronizing signals applied from the other connector end are converted into voltage values by F/V converters. A microcomputer determines the presence of a synchronizing signal and selects an input signal from the connector end of a high priority level set in a non-volatile memory.
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patent: 4460918 (1984-07-01), Flasza
patent: 4665438 (1987-05-01), Miron et al.
patent: 4682234 (1987-07-01), Naimpally
patent: 4954880 (1990-09-01), Tanimizu
patent: 5034818 (1991-07-01), Baik-Hee
patent: 5202765 (1993-04-01), Lineberry
patent: 5361099 (1994-11-01), Kim
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Patent Abstracts of Japan , vol. 18, No. 284 (P-1745) May 30, 1994; JP-A-06 051730, Feb. 25, 1994.
Patent Abstracts of Japan , vol. 18, No. 284, (P-1745), May 30, 1994; JP-A-06 051729, Feb. 25, 1994.
Hiraka Tadahiko
Sakai Yoshikazu
Sakuda Junji
Callahan Timothy P.
Nanao Corporation
Nu Ton My-Trang
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