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81. 发明专利

FR2053815A5 未知
公开(公告)号：FR2053815A5
公开(公告)日：1971-04-16
申请号：FR6924589
申请日：1969-07-18
申请人： THOMSON CSF
IPC分类号： H03F3/54 , H03F3/62 , H03F3/64 , H03F3/00 , H03H7/00 , H04B3/00

82. 发明专利

FR1587243A 未知
公开(公告)号：FR1587243A
公开(公告)日：1970-03-13
申请号：FR1587243D
申请日：1968-10-25
IPC分类号： H04B1/58 , H03F3/64 , H04B3/38
摘要： 1,241,304. Compander. WESTERN ELECTRIC CO. Inc. 24 Oct., 1968 [26 Oct., 1967], No. 50515/68. Heading H4R. A two-way circuit which can function as a compander, compressing outgoing signals and expanding incoming signals, comprises a summing amplifier 22 to which the incoming signal and the outgoing signal are applied and the output from which is added, in phase opposition, to the incoming and outgoing signals via attenuators n1 and n2 respectively. By suitable choice of the attenuation ratios of attenuators n1, n2, m1 and m2, the circuit can provide an impedance match to both lines 10, and 32. In addition by making attenuators m1 and n2 non- linear, e.g. as shown in Fig. 4B, the arrangement is given compander characteristics such that the signal from line 10 is compressed before transmission to line 32, and the signal from line 32 expanded before transmission to line 10. In an alternative embodiment the signals from the lines are applied to the attenuators m1 and m2 via emitter followers while the sum signals are applied to the lines from attenuators n1 nad n2 via separate common emitter amplifying stages with undecoupled emitter resistors.

83. 发明专利

DE1804410A1 未知
公开(公告)号：DE1804410A1
公开(公告)日：1969-05-14
申请号：DE1804410
申请日：1968-10-22
申请人： WESTERN ELECTRIC CO
发明人： BARSEAU GAUNT JUN WILMER
IPC分类号： H04B1/58 , H03F3/64 , H04B3/38 , H03F3/62
摘要： 1,241,304. Compander. WESTERN ELECTRIC CO. Inc. 24 Oct., 1968 [26 Oct., 1967], No. 50515/68. Heading H4R. A two-way circuit which can function as a compander, compressing outgoing signals and expanding incoming signals, comprises a summing amplifier 22 to which the incoming signal and the outgoing signal are applied and the output from which is added, in phase opposition, to the incoming and outgoing signals via attenuators n1 and n2 respectively. By suitable choice of the attenuation ratios of attenuators n1, n2, m1 and m2, the circuit can provide an impedance match to both lines 10, and 32. In addition by making attenuators m1 and n2 non- linear, e.g. as shown in Fig. 4B, the arrangement is given compander characteristics such that the signal from line 10 is compressed before transmission to line 32, and the signal from line 32 expanded before transmission to line 10. In an alternative embodiment the signals from the lines are applied to the attenuators m1 and m2 via emitter followers while the sum signals are applied to the lines from attenuators n1 nad n2 via separate common emitter amplifying stages with undecoupled emitter resistors.

84. 发明专利

CH372714A Verstärker für doppelseitige Gesprächsverbindung 未知
公开(公告)号：CH372714A
公开(公告)日：1963-10-31
申请号：CH7456259
申请日：1959-06-17
申请人： GYLLING & CO AB
发明人： KURT HENRY MINDERMANN
IPC分类号： H03F3/64

85. 发明专利

CH342994A Gabelschaltung 未知
公开(公告)号：CH342994A
公开(公告)日：1959-12-15
申请号：CH342994D
申请日：1956-07-10
申请人： PHILIPS NV
发明人： SIMON DUINKER
IPC分类号： H03F3/64 , H03F15/00 , H04B1/58 , H04R23/00

86. 发明专利

DE1031831B 未知
公开(公告)号：DE1031831B
公开(公告)日：1958-06-12
申请号：DEM0014850
申请日：1952-07-21
申请人： RUDOLF MEHR
发明人： MEHR RUDOLF
IPC分类号： H03F3/64

87. 发明专利

CH324352A Schaltungsanordnung zur Nachrichtenübermittlung in zwei Richtungen 未知
公开(公告)号：CH324352A
公开(公告)日：1957-09-15
申请号：CH324352D
申请日：1953-06-29
申请人： HAZELTINE CORP
发明人： RODERIC VANE LOWMAN
IPC分类号： H03F3/62 , H03F3/64 , H04B1/56

88. 发明专利

DE956692C 未知
公开(公告)号：DE956692C
公开(公告)日：1957-01-24
申请号：DEH0016894
申请日：1953-06-30
申请人： HAZELTINE CORP
发明人： LOWMAN RODERIC V
IPC分类号： H03F3/62 , H03F3/64 , H04B1/56

89. 发明专利

FR1081085A 未知
公开(公告)号：FR1081085A
公开(公告)日：1954-12-15
申请号：FR1081085D
申请日：1953-07-10
申请人： HAZELTINE CORP
IPC分类号： H03F3/62 , H03F3/64 , H04B1/56

90. 发明专利

DE915828C 未知
公开(公告)号：DE915828C
公开(公告)日：1954-07-29
申请号：DEW0008825
申请日：1952-06-17
申请人： WESTERN ELECTRIC CO
发明人： JUN WALTER KOENIG
IPC分类号： H03F3/62 , H03F3/64
摘要： 713,387. Transistor amplifying circuits. WESTERN ELECTRIC CO., Inc. Aug. 1, 1952 [Aug. 2, 1951 ; Aug. 2, 1951], No. 19526/52. Class 40 (6) An amplifier circuit comprises two transistors of the kind described in Specification 694,021, one electrode of one transistor being connected to an electrode of the other transistor and the remaining electrodes providing two pairs of external circuit connections, one pair of which comprises two dissimilar electrodes from the two transistors while the other pair comprises the two remaining electrodes, the arrangement being such and the circuit parameters being so chosen that the circuit is capable of transmitting signals in either direction between the pairs of external circuit connections. The electrodes which are connected together may be of similar type in which case both pairs of external circuit connections comprise two dissimilar electrodes. Alternatively the electrodes which are connected together may be of dissimilar type in which case at least one pair of external circuit connections comprises a pair of dissimilar electrodes. In certain embodiments the circuit necessarily gives equal gain in both directions, providing that the two transistors have identical parameters in other embodiments equality of the gain in both directions may be achieved by suitable selection of the transistor constants, in particular the current amplification factor. Fig. 10 shows a circuit having similar electrodes (i.e. collectors) connected together and to the negative terminal of a battery 33 providing the D.C. supply. The small positive bias required for the emitters is obtained by means of the resistors 43. Choke coils 44 are provided to prevent the supply connections from short-circuiting the signalling currents. Fig. 12 shows a circuit wherein dissimilar electrodes (i.e. the base electrode of the upper transistor and the emitter of the lower transistor) are connected together through a condenser 36 providing a low impedance to signalling currents. Emitter bias is provided by resistors 48 and choke 46 prevents short circuiting of the signalling currents. The battery supply for certain of the embodiments may be fed from a distance over the signalling circuits, Fig. 12 illustrating such an embodiment, which would consequently be of particular use at an unattended repeater station. The circuit shown in Fig. 10, however, must be fed locally or, if it is desired to feed the circuit from a distance, a further pair of battery supply conductors must be provided. Figs. 5, 6 and 7 show arrangements not falling within the scope of the invention wherein similar electrodes are connected together and similar electrodes are grouped in pairs to provide the external circuit connections. Fig. 5 shows the arrangement wherein the base electrodes are connected together while Figs. 6 and 7 (not shown) illustrate arrangements having the emitters and collectors connected together respectively. In each of these arrangements a local battery supply is necessary.

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