US2137354A - Receiving connection system for televison receivers - Google Patents
Receiving connection system for televison receivers Download PDFInfo
- Publication number
- US2137354A US2137354A US16430A US1643035A US2137354A US 2137354 A US2137354 A US 2137354A US 16430 A US16430 A US 16430A US 1643035 A US1643035 A US 1643035A US 2137354 A US2137354 A US 2137354A
- Authority
- US
- United States
- Prior art keywords
- relaxation
- connection system
- grid
- tube
- receiving connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/10—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials
- G01N9/12—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials by observing the depth of immersion of the bodies, e.g. hydrometers
- G01N9/14—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials by observing the depth of immersion of the bodies, e.g. hydrometers the body being built into a container
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F19/00—Fixed transformers or mutual inductances of the signal type
- H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
- H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/08—Separation of synchronising signals from picture signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
- H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Nonlinear Science (AREA)
- Picture Signal Circuits (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Television Receiver Circuits (AREA)
- Plasma Technology (AREA)
- Burglar Alarm Systems (AREA)
- Amplifiers (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Superheterodyne Receivers (AREA)
- Discharge Lamp (AREA)
Description
.NOV. 22, 1938. K SCHLESINGER 2,137,354
RECEIVING CONNECTION SYSTEM FOR TELEVISION RECEIVERS Filed April/l5, 19:55
Jnrenfar:
image current may accordingly be tapped at an' Patented Nov. 22, 1938 PATENT OFFICE RECEIVING CONNECTION SYSTEM FOR TELEVISON RECEIVERS Kurt Schlesinger, Berlin, Germany, assignor to Radioaktiengesellschaft D. S. Loewe, Berlin- Steglitz, Germany Application April 15,
1935, Serial No. 16,430
In Germany April 20, 1934 4 Claims.
In the patent application Ser. No. 717,310 there are described detecting arrangement for television reception, which is distinguished by particular lack of sluggishness in the rectification and by compensation of the intermediate frequency carrier wave simultaneously with the rectification.
The subject matter of the present invention is an arrangement which permits of utilization of this connection system for obtaining simultaneously the synchronization signals from the detecting circuits. f
The essence of the invention is described in conjunction with the arrangements illustrated by Way of example in the accompanying drawing,
' in which Fig. 1 illustrates the system and Figs.
2 and 3 particular parts thereof.
In the same I is the final intermediate frequency amplifying tube of a television superhet. The same acts on an intermediate frequency output transformer with the coils 2 and 3. These coils-as already set forth, the American patent specification Ser. No. 749,511-are preferably so timed that the natural oscillation of 2 is lower and that of 3 higher than the extreme side frequencies of the transmission. The latter coil acts in push-pull connection on the twin grids 4, 6 of the detector tube 4. The secondary coil 3, which is designed to be extremely poor in capacity, is earthed not in direct fashion, but at the centre through the medium of a high ohmic resistance 1. Its damping may be adjusted by means of a parallel resistance 8. The exact counter-phase may conveniently be ensured by an earthed intermediate screen 9. In this manner it is accomplished that no further intermediate frequency but merely the demodulated low frequency occurs at the anode ID of the tube. The
anode resistance II, and passed through the medium of a blocking condenser l2 to the control grid of a Braun tube l3. The synchronization signals are obtained according to the invention as follows:
The television transmitter is assumed to be one in which the carrier Wave disappears completely only for the duration of the synchronization impulses. The anode IB is accordingly strongly charged negatively during the synchronization impulses. Negative signals of this kind cannot be employed in direct fashion for controlling the relaxation oscillator controlling the scanning. The problem of reversing the phase accordingly arises.
According to the patent application Ser. No. 717,310, this problem is solved by the use of transformers. The solution to the second part of the problem, viz., the separation of the signals from the image current by an amplitude filter, is provided in accordance with the patent application Ser. No. 717,310 by a special glow lamp with hot cathode.
According to the invention, these two problems are solved in a simple way by deriving the synchronization currents not from the anode circuit of the detector 4, but from the grid circuit thereof.
For this purpose a tapping is applied to the middle point of the coil 3. This point is devoid of high-frequency potentials against earth and carries the pure modulating potentials in opposite phase to the anode circuit. The synchronization signals accordingly consists at this point of positive impulses.
This point may accordingly be connected in direct fashion to the filter circuit of the relaxation apparatus via a series resistance I l, which has to be somewhat larger than the resistance 1.
By means of a small blocking condenser 15, which is earthed, it is possible to leak-01f any traces of carrier high frequency. The filter circuits separating the long frame impulses from the short line impulses consist of a low pass resistance-capacity filter l6, l1 conducting to the input of the frame synchronizing relaxation tube 20 and a high-pass capacity-resistance filter l8, l9 conducting to the input of the line synchronizing relaxation tube 23.
The gas-filled relaxation tubes 20 and 23 are negatively biassed by resistances 2| respectively 25. The bias preferably amounts to a few volts. A control of this relaxation apparatus, therefore, only takes place when a certain minimum potential of a few tenths of a volt has been exceeded, and then only when the relaxation condenser 22 has already been charged nearly up to the ignition potential. This means that the frequency of the free relaxation oscillation must preferably be selected to be approximately equal to the scanning frequency, and that the smaller the potentials which are sufficient for the control the more exact this agreement between the frequencies will be required to be.
The tubes 20 and 23 accordingly attend automatically to the requisite amplitude selection between synchronization signals and image current impulses.
In order to improve the amplitude selection it is advisable to replace the tubes 20 and 23 of Fig. 1 by screen grid tubes, preferably as shown in Fig. 3. Discharge in screen grid tubes of the gas-filled type is entirely dependent on the potential of the control-grid, and therefore on the synchronizing impulse potential, whereas upon the using gasfilled triodes premature discharge may occur under control of the local oscillation. The relaxation condenser 29, shunting cathode and anode is in the manner known per se charged through the medium of a resistance 30. The screening grid is connected through the medium of a series resistance 3| with a battery 32, the potential of which is so adjusted that a desired negative bias 34 may be applied to the control grid 33 to which through the medium of the condenser 35 the impulse signals are supplied. The advantage of a screening-grid tube of this nature is charact'erized by the fact that the ignition no longer depends on the instantaneous value of the anode potential, but merely on that of the screeninggrid and the inner grid. The former remains constant and the latter is more or less positively controlled. The biasses of both grids are madjusted that solely the positive peak values which are supplied by the synchronization signals are capable of initiating a discharge. This immediately jumps over through the screening grid to the anode, and leads to the desired discharge of the relaxation condenser 29. If this control should occur too late, 29 is nevertheless unable to discharge until the inner grid 33 releases the ignition, and the discharge then takes place with increased intensity of current. The screeninggrid tube accordingly has the advantageous property of being positively dependent on the synchronization signals even in the case of appreciable detuning between the free oscillation and the desired frequency, Whilst the single-grid tube according to Fig. 1 discharges prematurely, when the synchronization signals fail to occur.
I claim:
1. In a television receiver for receiving a mixture of image signals and negative synchonization impulses modulated onto the same carrier wave including a push-pull detector tube having input and output for demodulating said carrier wave a picture reproducing device connected to the output of saiddetector and relaxation oscillators for line and frame synchronization, said input consisting of a selfinduction coil connected to the grids of said detector tube, the middle point of said coil being connected by an impedance to the cathode of said tube and by filtering means to the input of the relaxation oscillators.
2. In a television receiver according to claim 1, said impedance consisting of an ohmic resistance.
3. In a television receiver according to claim 1, said filtering means consisting of a resistancecapacity and a capacity-resistance member, the mean point of each member being connected to one of said relaxation oscillators.
4. In a television receiver according to claim 1, each of said relaxation oscillators being provided with a gas-filled screening grid discharge tube.
KURT SCHLESINGER.
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE435417X | 1933-03-29 | ||
DE2029640X | 1933-07-19 | ||
DER89049D DE681003C (en) | 1933-03-29 | 1933-10-24 | Audio rectifier circuit for television receivers |
US717310A US2068768A (en) | 1933-03-29 | 1934-03-26 | Detector for ultra short waves |
US74701134A | 1934-10-05 | 1934-10-05 | |
US77416A US2097804A (en) | 1933-03-29 | 1936-05-01 | Amplitude filter circuit for television receivers |
US80584A US2094678A (en) | 1933-03-29 | 1936-05-19 | Detector for ultra short waves |
Publications (1)
Publication Number | Publication Date |
---|---|
US2137354A true US2137354A (en) | 1938-11-22 |
Family
ID=32512791
Family Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US735600A Expired - Lifetime US2029640A (en) | 1933-03-29 | 1934-07-17 | Audion arrangement for short wave television purposes |
US749236A Expired - Lifetime US2118866A (en) | 1933-03-29 | 1934-10-20 | Detector |
US16430A Expired - Lifetime US2137354A (en) | 1933-03-29 | 1935-04-15 | Receiving connection system for televison receivers |
US77416A Expired - Lifetime US2097804A (en) | 1933-03-29 | 1936-05-01 | Amplitude filter circuit for television receivers |
US80584A Expired - Lifetime US2094678A (en) | 1933-03-29 | 1936-05-19 | Detector for ultra short waves |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US735600A Expired - Lifetime US2029640A (en) | 1933-03-29 | 1934-07-17 | Audion arrangement for short wave television purposes |
US749236A Expired - Lifetime US2118866A (en) | 1933-03-29 | 1934-10-20 | Detector |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US77416A Expired - Lifetime US2097804A (en) | 1933-03-29 | 1936-05-01 | Amplitude filter circuit for television receivers |
US80584A Expired - Lifetime US2094678A (en) | 1933-03-29 | 1936-05-19 | Detector for ultra short waves |
Country Status (6)
Country | Link |
---|---|
US (5) | US2029640A (en) |
BE (1) | BE405607A (en) |
DE (1) | DE681003C (en) |
FR (7) | FR770575A (en) |
GB (6) | GB435417A (en) |
NL (2) | NL52223C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2448771A (en) * | 1943-09-23 | 1948-09-07 | Du Mont Allen B Lab Inc | Cathode-ray oscillograph circuit |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2721951A (en) * | 1950-12-29 | 1955-10-25 | Rca Corp | Low reactance electron discharge device |
US2840749A (en) * | 1952-10-17 | 1958-06-24 | Bell Telephone Labor Inc | Electron discharge devices |
RU2470399C1 (en) * | 2011-05-16 | 2012-12-20 | Сергей Владимирович Аликов | Transformer |
-
0
- NL NL46052D patent/NL46052C/xx active
- NL NL52223D patent/NL52223C/xx active
- BE BE405607D patent/BE405607A/xx unknown
-
1933
- 1933-10-24 DE DER89049D patent/DE681003C/en not_active Expired
-
1934
- 1934-03-23 FR FR770575D patent/FR770575A/en not_active Expired
- 1934-03-24 GB GB9249/34A patent/GB435417A/en not_active Expired
- 1934-07-17 FR FR45063D patent/FR45063E/en not_active Expired
- 1934-07-17 US US735600A patent/US2029640A/en not_active Expired - Lifetime
- 1934-07-19 GB GB21084/34A patent/GB441285A/en not_active Expired
- 1934-10-10 FR FR45442D patent/FR45442E/en not_active Expired
- 1934-10-11 GB GB29093/34A patent/GB447401A/en not_active Expired
- 1934-10-20 FR FR45446D patent/FR45446E/en not_active Expired
- 1934-10-20 US US749236A patent/US2118866A/en not_active Expired - Lifetime
- 1934-10-22 GB GB30180/34A patent/GB449316A/en not_active Expired
- 1934-10-22 FR FR45447D patent/FR45447E/en not_active Expired
-
1935
- 1935-02-15 GB GB4856/35A patent/GB452118A/en not_active Expired
- 1935-02-15 FR FR46060D patent/FR46060E/en not_active Expired
- 1935-04-15 US US16430A patent/US2137354A/en not_active Expired - Lifetime
- 1935-04-17 FR FR46091D patent/FR46091E/en not_active Expired
- 1935-04-18 GB GB11940/35A patent/GB446707A/en not_active Expired
-
1936
- 1936-05-01 US US77416A patent/US2097804A/en not_active Expired - Lifetime
- 1936-05-19 US US80584A patent/US2094678A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2448771A (en) * | 1943-09-23 | 1948-09-07 | Du Mont Allen B Lab Inc | Cathode-ray oscillograph circuit |
Also Published As
Publication number | Publication date |
---|---|
DE681003C (en) | 1939-09-13 |
FR46060E (en) | 1936-02-15 |
US2118866A (en) | 1938-05-31 |
FR45063E (en) | 1935-05-29 |
GB446707A (en) | 1936-05-05 |
US2029640A (en) | 1936-02-04 |
FR46091E (en) | 1936-02-15 |
GB435417A (en) | 1935-09-20 |
FR45447E (en) | 1935-09-04 |
FR45442E (en) | 1935-09-04 |
GB452118A (en) | 1936-08-17 |
NL52223C (en) | |
FR45446E (en) | 1935-09-04 |
GB447401A (en) | 1936-05-11 |
NL46052C (en) | |
GB441285A (en) | 1936-01-16 |
FR770575A (en) | 1934-09-15 |
BE405607A (en) | |
US2097804A (en) | 1937-11-02 |
US2094678A (en) | 1937-10-05 |
GB449316A (en) | 1936-06-22 |
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