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1. 发明专利

JPH04270520A STL FOR AM STEREO 失效
公开(公告)号：JPH04270520A
公开(公告)日：1992-09-25
申请号：JP3094291
申请日：1991-02-26
申请人： JAPAN BROADCASTING CORP
发明人： FUJITANI IKUSHI , NAKA TAKASHI
IPC分类号： H03C1/24 , H04H1/00 , H04H40/36
摘要： PURPOSE:To realize the STL for AM stereo in which transmission quality is improved without harmonic distortion and phase distortion and the transmission efficiency is improved through the effective utilization of an occupied frequency band with a simple circuit constitution. CONSTITUTION:The STL is featured to be provided with an orthogonal modulator 10 applying carrier suppression orthogonal modulation to a stereo signal, a frequency modulator 60 applying frequency multiplexing to a modulated stereo signal, a monaural signal and an ordering signal, and a high frequency transmission section 70 sending the synthesized signal subject to frequency multiplexing at a UHF band or an SHF band.

2. 发明专利

FR938464A 未知
公开(公告)号：FR938464A
公开(公告)日：1948-09-16
申请号：FR938464D
申请日：1946-11-14
申请人： INT STANDARD ELECTRIC CORP
发明人： ROYDEN GEORGE TAYLOR
IPC分类号： F16L27/08 , H03B5/34 , H03C1/24 , H03C3/09 , H03C3/16 , H03C3/40

3. 发明专利

DE706267C 未知
公开(公告)号：DE706267C
公开(公告)日：1941-05-22
申请号：DEL0093654
申请日：1937-11-16
申请人： LORENZ C AG
发明人： WELFF EUGEN , HILKE DR PHIL OTTO , FERTSCH HELLMUTH
IPC分类号： H03C1/24

4. 发明专利

FR850058A 未知
公开(公告)号：FR850058A
公开(公告)日：1939-12-07
申请号：FR850058D
申请日：1939-02-09
申请人： TELEFUNKEN GMBH
IPC分类号： H03C1/24 , H03C1/30

5. 发明专利

GB469363A Improvements in or relating to amplitude modulating circuit arrangements 未知
公开(公告)号：GB469363A
公开(公告)日：1937-07-23
申请号：GB3206336
申请日：1936-11-23
申请人： TELEFUNKEN GMBH
IPC分类号： H03C1/24
摘要： 469,363. Valve modulating circuits. TELEFUNKEN GES FUR DRAHTLOSE TELEGRAPHIE. Nov. 23, 1936, No. 32063. Convention date, Nov. 22, 1935. [Class 40 (v)] In amplitude modulating systems in which there are two alternating current paths in parallel carrying oppositely phased carrier frequency currents, modulation by a plurality of signals is obtained by applying each signal to different electrodes of a valve or valves in one or both of the parallel paths. The carrier is supplied to the primary 11 of transformer T1, Fig. 1, the parallel paths consisting of transformer windings 13, 14 and windings 12 15 and the hexode 10. The modulation voltages are applied at ml to grid 1 and at m2 to the grid 3. The modulated output in winding 15 combines with the carrier in winding 14, which is in opposite phase to produce a greater depth of modulation in the output 17. In a modification, Fig. 2, the parallel paths consist of two hexodes 18, 19. The carrier is supplied in phase opposition to grids 31, 3 from transformer 20. The modulating voltages are applied at m1 and m2 to grids 1 , 1 respectively. The output from the anodes is taken in parallel to the circuit 25.

6. 发明专利

GB446145A Improvements in or relating to electrical oscillation generators 未知
公开(公告)号：GB446145A
公开(公告)日：1936-04-24
申请号：GB2079535
申请日：1935-07-22
申请人： TELEFUNKEN GMBH
IPC分类号： H03C1/24 , H03D7/10
摘要： 446,145. Valve generating circuits. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE, 12, Hallesches Ufer, Berlin. July 22, 1935, No. 20795. Convention date, July 20, 1934. [Classes 39 (i) and 40 (v)] One grid of a multi-grid valve is located between electrodes, preferably screen-grids, at a higher positive potential and is connected to frequency determining means to generate oscillations by dynatron action using secondary emission, the useful output being taken from a further electrode such as the anode. In a generator giving a small constant output for measurements or comparison, the third grid G3 of a 4-grid valve is supplied through the tuned circuit L, C from a voltage-divider W1, W2 with a positive voltage lower than that on the adjacent grids G2, G4. Dynatron oscillations generated in the circuit L, C are taken off from the anode circuit at L . Retroaction effects are reduced by constructing the grid G4 as a screen and stray capacity effects are avoided by an earthed electrostatic screen S. The oscillations may be modulated with the frequency of the supply mains M, or with harmonies thereof if the rectifier D is full-wave or multiphase instead of single-wave as shown, by moving the switch Sch on to contact II to supply the anode with unsmoothed rectified current. Alternatively, a speechcurrent transformer may be inserted in the anode circuit, or the anode circuit may be tuned to a desired modulation frequency and the anode A maintained at a lower voltage than the grid G4 to generate by dynatron action oscillations which modulate the main oscillations generated in the circuit L, C. The first grid G1 is connected to the cathode K or given a low positive or negative bias. The oscillating valve of Fig. 1 may be used as a self-oscillating mixer valve of a super. heterodyne receiver, Fig. 2 (not shown), by applying the incoming signal oscillations to either of the grids G1, G2.

7. 发明专利

GB420019A Process and apparatus for the electric transmission of signals by high frequency waves 未知
公开(公告)号：GB420019A
公开(公告)日：1934-11-23
申请号：GB1506933
申请日：1933-05-24
申请人： SOC INDEP TELEGRAPHIE SANS FIL
IPC分类号： H03C1/02 , H03C1/22 , H03C1/24 , H03C1/54 , H03C7/02 , H04N5/38
摘要： 420,019. Valve modulating circuits. SOC. INDEPENDANTE DE TELEGRAPHIE SANS FIL, 75, Boulevard Haussmann, Paris. May 24, 1933, Nos. 15069, 15070, 15071, and 15072. Convention dates, May 24, 1932, Oct. 21, 1932, Nov. 2, 1932, and March 2, 1933. [Class 40 (v)] In a radio or like transmitting system, the modulating voltage is applied in the same phase to a number of carrier-wave amplifiers of increasing power-handling capacity connected in cascade. Modulation may be effected solely in the initial stage, the later stages acting merely as amplifiers with increased efficiency ; or the depth of modulation may be increased at each successive stage. To avoid distortion due to the flow of grid current at peak values of the carrier wave, the modulation voltage may be applied to diode or triode damping- valves which put a variable load on the inter-valve circuits in such manner as to compensate for the load introduced by grid current in the succeeding amplifier. Fig. 1 shows a system diagrammatically, in which only one stage 2 is used for modulation. The carrier is applied thereto at 1, 1 and the modulating voltage at 3, 3 , the modulated wave proceeding to the amplifier 4 and thence to the aerial 7. The modulating voltage is also applied through a transfer device 3a to the input of the amplifier 4, with the object of keeping the power consumption in this amplifier in proportion to the momentary amplitude of the carrier. Fig. 3 shows a valve circuit in which modulation is effected at each stage. Four stages in cascade are shown, operating in push-pull at each stage as regards the carrier, whilst the modulating-voltage is amplified at 14, 14 and applied through transformer secondaries 17 ... 20 to each successive stage. Each grid pair is separately biassed by sources 21 .... 24, and the modulating voltage for each stage is adjustable by potentiometers. In a modification (Fig. 4 not shown), the modulating voltage is applied in phase opposition to the grid pairs, and the chain of valves is arranged to pass only the side-bands, the carrier being amplified separately and combined with the side-bands in the aerial. Fig. 8 shows one form of the grid-current compensator. A pair of diode valves 46, 46a are connected back-to-back in a circuit tapped across the tuned circuit 44. The plate voltage and therewith the conductance of the valves is varied by the modulating-voltage applied to a transformer 50. When, at peak voltages of the carrier, grid current in the valves 4 , 4 a puts an added load on the tuned circuit 44, the load presented by the diodes 46, 46a is reduced. In a modification (Fig. 9 not shown) the diodes are in an inductively-coupled circuit, and their plate voltages are varied by a resistance traversed by the modulating-current. Triode valves may be used instead of diodes, the modulating voltage being applied to their grids. (Fig. 10 not shown). The compensating-device of Figs. 8-10 may be employed to distort the modulating-curve of a transmitter in such a way as to neutralize the curvature of the demodulation curve of a normal broadcast receiver.

8. 发明专利

GB350152A Improvements in or relating to high frequency transmitters 未知
公开(公告)号：GB350152A
公开(公告)日：1931-06-11
申请号：GB1259630
申请日：1930-04-23
申请人： MARCONI WIRELESS TELEGRAPH CO
IPC分类号： H03C1/24
摘要： 350,152. Valve modulating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London. -(Assignees of Peterson, H. O. ; Riverhead, Long Island, New York, U.S.A.) April 23, 1930, No. 12596. Convention date, May 6, 1929. [Class 40 (v).] The carrier-frequency produced by a valve O controlled by a piezo-crystal 6 is amplified by a screen-grid valve A whose output circuit is coupled to the radiating system 22, 23, the potential on the screening grid 24 of the valve A being varied in accordance with the speech-currents from a microphone T which varies the potential of the plate of valve M connected directly to said screening-grid. A choke 33 is connected in the plate circuit of valve M to divert the speech potentials to the grid 24 and a condenser 36 between this grid and earth shunts away radio-frequency oscillations.

9. 发明专利

GB149214A Improvements in wireless telephone transmitters 未知
公开(公告)号：GB149214A
公开(公告)日：1922-01-12
申请号：GB2096120
申请日：1920-07-12
申请人： SIEGMUND LOEWE
IPC分类号： H03C1/24
摘要： 149,214. Loewe, S. Oct. 29, 1918, [Convention date]. Wireless telephony; electric oscillations, producing.-In thermionic apparatus particularly applicable to wireless telephony, the transmitting-valve 1 is in parallel with a control valve 10, both being supplied with energy from a common source 5, the current to each passing through a coil 7 in, or coupled to, the antenna circuit. The grid circuit of the control valve 10 includes a transformer 15 influenced by telephone currents produced in any suitable way, a condenser telephone in conjunction with an.amplifier being mentioned as particularly suitable. The grid circuit 9 is tuned to approximately the same frequency as the antenna circuit so that the valve 1 produces continuous oscillations. By supplying oscillations of suitable frequency through transformer 15, the apparatus may be used for production of audibly modulated waves. The Specification as open to inspection under Sect. 91 (3) (a) states that the two valves may be combined in one tube having two grids, the control grid being near to the cathode. This subject-matter does not appear in the Specification as accepted.

10. 发明专利

DE763241C 未知
公开(公告)号：DE763241C
公开(公告)日：1955-08-11
申请号：DER0093230
申请日：1935-05-01
申请人： OPTA RADIO A G
IPC分类号： H03C1/24 , H03F1/08 , H04N5/40

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