发明名称 |
PERFECCIONAMIENTOS INTRODUCIDOS EN LAS CONEXIONES DE INSTA- LACIONES DE INTERFONO, DE INTERCOMUNICACION EN DUPLEX O DE INSTALACIONES DE ALTAVOCES MANDADAS POR PULSADORES. |
摘要 |
<p>This communication system has each station equipped with a repeater loudspeaker amplifier, microphone amplifier, call keys and tally-lamps. These stations are connected to a central unit that contains the matrix and gates. Each gate consists of a pair of back-to-back diodes in each of the two communication lines. The centre points of the diode pairs are connected together by a centre-tapped inductance so that the gates may be biased on or off. Transistor amplifiers are used to unlatch called-stations and initiate engaged-tally indications to other stations. Flashing call tallies are provided for alerting the called station.</p> |
申请公布号 |
ES439298(A1) |
申请公布日期 |
1977.03.01 |
申请号 |
ES19980004392 |
申请日期 |
1975.07.10 |
申请人 |
NEUMANN ELEKTRONIK, G. M. B. H. |
发明人 |
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分类号 |
H04M9/00;(IPC1-7):04M/ |
主分类号 |
H04M9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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