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US3731234A
(en)
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Combined voice frequency transmission and dc signaling circuit
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US5274704A
(en)
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Transformer telephone line interface circuit
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CA1088687A
(en)
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Automatic signal level adjusting circuits for use in telephone sets
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KR100821422B1
(ko)
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평형 전송 종단 장치 및 그것을 이용한 수신 장치
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US3582563A
(en)
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Apparatus for matching the impedance of a telephone set to a line
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US5038375A
(en)
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Circuit arrangement for preventing gain from responding to frequency variation despite the presence of an isolation transformer
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CA1157978A
(en)
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Loop sensing circuit for use with a subscriber loop interface circuit
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US3810247A
(en)
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Telephone set circuit
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US2286069A
(en)
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Telephone set circuit
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CA1267738A
(en)
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Telephone set comprising a line voltage stabilizer having a dc supply point
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US3904838A
(en)
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Two-wire, bi-directional voice frequency repeater
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JP3607639B2
(ja)
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２線４線変換回路
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JPS6042946A
(ja)
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適応線路ハイブリツド回路
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US1811947A
(en)
|
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Noise suppressing circuit
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US2775649A
(en)
|
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Telephone subscriber sets
|
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US3418561A
(en)
|
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Solid-state filter circuit
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FR2657736A1
(fr)
|
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Circuit a resistance variable commandee en tension.
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US1654633A
(en)
|
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Recording system
|
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JPH03289221A
(ja)
|
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擬似通信回路網
|
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US2318681A
(en)
|
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Telephone set
|
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GB2075798A
(en)
|
|
Central office interface circuit
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US4899379A
(en)
|
|
Circuit arrangement for the connection of line circuits of a digital time multiplex-telephone network
|
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JPS6226208B2
(enExample)
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|
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JP3031518B2
(ja)
|
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側音回路
|
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US1857830A
(en)
|
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Transmission circuit
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