DE2521385A1 - ELECTRONIC CHANNEL SELECTION SYSTEM WITH REMOTE CONTROL FOR A HF SIGNAL RECEIVER - Google Patents

Description

GTE Sylvania Inc., U.S.A. B. May 1975

GTE-PA 45

PATENT APPLICATION

Electronic channel selection system with remote control for an RF signal receiver

The present invention relates to an electronic channel selection system with remote control for an RF signal receiver, in particular television receiver equipped with a varactor tuner, the channel selection system is provided with a rotary switch driven by a motor and has a switch which switches from manual to remote control, and uses neon lights that are assigned to the receiving channels are.*

Usually, such a Device understood that arranged on the receiving device Controls for selecting the receiving channel actuated will. On the other hand, remote control means the actuation of corresponding control elements on one Control unit set up for remote control, which can be operated via cable or wirelessly, e.g. via ultrasound interacts with the receiving device.

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From US-PS 3 BOB 843 a voting system operated by hand or by remote control is known known that uses several voltage sources and switch sets for the operation of a varactor tuner. Another solution is known from US Pat. No. 3,801, wherein a remote control or manual switching system which is a circuit for directional rotation of an inter-switch contact piece for rotary switching. From DT-GS 2 414 414, which corresponds to US-PS 3 796 938, it is known, with a corresponding circuit for the intentional skipping of channels by means of a remote control system for channel selection. Finally is under the American file number (Serial No.) 445 796, also registered by the same applicant as the aforementioned Property rights or registrations, an electronic channel selection system has been applied for, that uses neon lamps.

The previous technology used channel selection systems that were basically mechanical or electromechanical was. A loose cable system (not permanently installed) was used to select from a number of of channels to activate a desired one alone. In addition, this loose cable system was already often equipped with a switch to switch between manual and remote control the channel selection.

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Although the aforementioned mechanical signal channel selection technique has found practical application in some receivers with varactor tuners, it has been found that there are problems with the loose " ¹ cable system. In particular, it has been found that component characteristics and mechanical tolerances are particularly critical to a manufacturing process.

The invention was based on the object of an electronic channel selection system for an RF signal receiver to create that avoids the defects mentioned and, in particular, cheaper to manufacture is. Furthermore, it was requested that the tracking of manual channel selection with a new electronic To improve the remote control channel selection system, using fewer and cheaper and less critical parts, so as to lower the manufacturing cost.

The tasks are for the generic term mentioned solved according to the invention according to the characterizing part of the main claim.

Further details and refinements can be found in the subsequent claims and the description of an exemplary embodiment refer to.

As the preferred exemplary embodiment described below also shows, the required Properties achieved by the remote control or manual effecting the channel selection

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Switching with a manually or remotely operated Channel selection means is coupled, which is provided with follow-up means that respond to changes reacts in the manually operated, arranged in the receiver channel selection means and the corresponding Changes in the remote-controlled channel selection means caused .

The following is a preferred embodiment with reference to the drawing, which contains only one figure, described.

An electronic channel selection system for RF signal receivers includes a remote or hand operated Switching means 5, which is coupled to a voltage source B + and to a manual channel selection means 7 is. A channel selection means 9 with remote control is connected to the remotely or manually operated switching means 5 and the manual channel selector 9 connected. Besides that is a tracking device 11 with this

remotely or manually operated switching means 5, the manual channel selector 7 and the remote-controlled Channel selector 9 coupled.

Generally this is remote or hand operated Switching means 5 in a state with no energy supplied, and the actuation of the manual Channel selector 7 is used to manually select a given signal channel. When a given signal channel is selected by the manual channel selector 7, a signal is sent to the remote-controlled channel selector 9 with

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The help of the remote or manually operated switching means and also the follow-up means 11 are supplied. Thereon the remote-controlled channel selector 9 is changed until the position of the manually selected signal channel is reached. In addition, the remote controlled Channel selector 9 operable in a known manner by a remote-controlled signal transmitter or transmitter 93.

Typically, the remotely or manually operated switching means 5 contains a relay switch 13 with a manual position point 1 and a remote control position point 2. The relay switch is coupled through a resistor 15 to a voltage source B-f-. This is through a resistance 17 coupled to a Zener diode 19, which in turn is connected to ground and a resistor 21, which is connected directly and via a capacitor 23 to the manual channel selector 7. Also is manual position 1 with the manual channel selector and the follow-up means 11 connected, while the remote control position point 2 of the relay switch is coupled to the follow-up means 11.

Belonging to the relay switch 13 and forming a whole with this is an excitation coil 25, which with a bistable flip-flop circuit 27 is connected. The bistable flip-flop circuit 27 includes one first and second transistor 29 and 31. The first transistor 29 has a diode 33 with the emitter connected to the circuit ground. The collector

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of transistor 29 is connected via a resistor 35 to a voltage source B + - and via one in series switched resistor 37 and a shunted capacitor 39 with a resistor closed to the base of transistor 31. The junction of the resistor connected in series 37 and capacitor 39 is connected via a diode 43 to a capacitor 45 coupled in parallel and resistor 47 connected to circuit ground and connected to a capacitor 49 which is connected to the manually operated channel selector 7 is connected.

The second transistor 31 of the bistable flip-flop circuit 27 has one at the base of the transistor coupled emitter. The transistor 51 has a grounded emitter and a collector connected to the Excitation coil 25 of the relay switch 13 is coupled. The collector of transistor 31 is over a resistor 53 to the voltage source B + and through a resistor connected in series and capacitor 57 shunted by a resistor to the base of the first transistor 29 connected. The junction of the series resistor 55 and the capacitor 57 is connected to the remote-controlled channel selector 9, while a diode 61 connects the collector of the second transistor 31 to the remote-controlled channel selector 9 couples. Furthermore, a gate circuit 56 contains a transistor 58, the collector of which is connected to the base of the second transistor 31 is coupled, the emitter of which

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is grounded and its base via a resistor 60 is connected to ground and coupled to the diode 61 via a resistor 62.

The manual channel selector 7 contains a diode coupled to the position point 1 of the relay switch 13 in the remote or manually operated switching means 5. Several signal channels 65 coupled in parallel are connected to the diode 63, only one of which is shown. Either of the parallel-coupled signal channels 65 contains a diode 67 which is coupled to the voltage source B4 via the series-connected diode 63, the relay switch 13 and the resistor 15 and connected to the circuit ground via a series-connected neon lamp 69 and a resistor 71. A manual channel selector switch 73 connects the junction of each of the diodes 67 and neon lamps 69 to the voltage source B +. A transistor 75 has a grounded emitter, a base connected to the connection point of the neon lamp 69 and the resistor 71, and a collector which is coupled via an adjustable resistor 77 to a voltage source B +. The collector is also connected to a waveband switching, while the adjustable resistor 77 is coupled to a varactor tuner (not shown).

The remote-controlled channel selector 9 contains a rotary switch 79 with several contacts 81, each of which with the connection point of the diode 67, the neon lamp 69 and the manual channel selection switch 73, each of the parallel-connected signal channels 65 is connected.

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□ he rotary switch 79 has a rotatable arm 83 which " is mechanically coupled to an electric motor 85. This is connected to a motor relay 87, the again with the bistable flip-flop 27, a relay amplifier 89 and a motor control circuit is coupled.

The relay amplifier 89 responds to signals received from a transmitter or signal transmitter 93. The motor control circuit 91 includes a transistor 95 with a grounded emitter and a collector coupled to the motor relay 87, via a resistor 97 to a voltage source B + and via a resistor 99 to the diode 61 and the resistor 62 of the bistable flip-flop circuit. The base of the transistor 95 is connected to circuit ground via a resistor 101 and connected to the follow-up circuit 11 via a series-connected resistor 103, a diode 105 and a resistor 107. A resistor couples the ^connection points of the series-connected diode 105 and the resistor 107 to circuitry, while a resistor 110 connects the connection point of the series-connected resistor 103 and the diode 105 to the voltage source. In addition, the adjustable arm 83 of the rotary switch 79 is electrically coupled to the follow-up means 11.

The follow-up means 11 has a transistor 113, the emitter of which is via a resistor connected in series 115 and a diode 117 to the manual position or connection 1 of the relay switch 13 in the remote / manual1-

actuated switching means 5 is coupled. The base

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of the transistor 113 is connected to the external position connection 2 of the relay switch 13 via a diode 119 coupled. The collector of the transistor 113 is via a capacitor'121 to the base and via a Diode 123 to resistor 107 of the notor control circuit 91 coupled in the remote-controlled channel selector 9. The diode 123 is also across a resistor 125 coupled to the remote control position point 2 of the remote - or manually operated switch 5. Also is that Connection point of the diode 119, the capacitor 121 and the base of the transistor 113 with the rotatable Arm 83 of the rotary switch 79 connected.

As for the operation, it can be assumed that the relay switch 13 of the remote or hand-operated Switching means 5 in the manual position point 1 with the excitation coil 25 for manual operation is inactive. As a result, manual operation of a manual channel selection switch 73 causes it the supply of a voltage from the voltage source B * - to the neon lamp 69. This is intended to the Appearance of a negative pulse voltage at the junction of the series-connected diodes 63 and 67. The remaining, parallel-coupled signal channels 65 are then made ineffective, and the electronic switching of the signal channels, as detailed in the above, takes place simultaneously co-pending application, U.S. Serial No. 445,796, and discussed.

The negative pulse voltage occurring at the connection point of the diodes 63 and 67 is via the

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Capacitor 49, diode 43 and capacitor 39 to the base of the second transistor 31 of the bistable flip-flop circuit 27 coupled. The negative pulse voltage switches the transistors 31 and 51, whereupon no more current flows in the excitation coil 25 of the relay switch 13.

As far as the tracking is concerned, the non-alignment locks of the rotatable arm 83 of the rotary switch 79 with the signal channel 65 and the neon lamp 69, which is conductive, the current flow in the basic circuit of the Transistor 113 of follow-up means 11. With no current flow in transistor 113, transistor 95 the motor control circuit 91 is biased or it becomes non-conductive because of that of the diode 105 applied bias in the forward direction. Thereupon the motor relay 87 and the motor 85 call for movement of the rotatable arm 83 of the rotary switch 79 until the position of the energized or conductive channel 65 is reached. Then Base current is present at transistor 113 of follow-up means 11, transistor 95 of the motor control circuit 91 is made conductive and the motor 85 no longer moves the rotatable arm 83.

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As for the Ferq operation, cause a signal from the remote control transmitter 93, the excitation of the relay amplifier 89, which excites the motor relay 87. Therefore this supplies a voltage that allows the conduction of the second transistor 31 of the bistable flip-flop circuit 27 causes. Conducting the second transistor causes transistor 51 to saturate

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whereupon the relay switch 13 energizes and the remote control position point 2 of the switch 13 is electrically connected.

At the same time, the excitation of the motor relay 87 causes the actuation of the motor 65. This changes mechanically the rotatable arm 83 of the rotary switch 79 until the alignment with the selected Signal channel is reached. Then the user puts the remote control transmitter 93 out of operation, the relay amplifier 89 does not conduct, the motor relay 87 is out of operation and the motor 85 stops.

In addition, the run-on function and the remote-controlled channel selection function to the feed to cause a voltage to the bistable flip-flop switch. Then the second transistor would be 31 change its state and become non-conductive. As a result, the transistor 51 would become conductive and the undesired excitation of the exciting coil 25 of the relay switch 13 would be caused.

The gate circuit 56 in the form of the transistor 58 is however added to the circuit and over during manual mode tracking resistors 99, 62 and 60 are biased into the line. That is why the transistors 31 and 51 are non-conductive, and the relay switch 13 remains at the manual position point 1. During remote control operation are the transistors 31 and 51

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in a saturated, conductive state and the Diode 61 prevents the gate circuit 56 from causing the bistable flip-flop circuit 27 to operate .

In this way a new type of electronic channel selection system is created for signal receivers with varactor tuners. The system offers improved manual or remote control settings Channel selection with a minimum of mechanical levers and largely "electronic operation". In addition, the manual channel selection is accompanied by the after-run of the remote-controlled channel selection device, which means avoids user confusion about channel selection.

What has been shown and described above is presently considered to be the preferred embodiment of the invention. However, it is suggested to those skilled in the art that various changes and modifications can be made can without departing from the scope of the invention outlined in the following claims.

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Claims (5)

Patent claims : Electronic channel selection system with remote control for an RF signal receiver, especially television receivers, which is equipped with a varactor tuner, whereby the channel selection system with a rotary switch driven by a motor is provided and has a switch that controls the It switches from manual to remote control, and neon lamps are used to set the receiving channels assigned to sin_d, characterized by the combination of the following features: A. A means for remote or hand-operated switching (5) coupled to the voltage source; B. One with this remote or manually operated switching means (§) and the varactor tuner coupled means (7) for channel selection with handj C. One with the remote or manually operated switching device (5] and the means (7) for hand-operated channel selection coupled to remote-controlled channel selection Means (9) containing a control circuit (91) which is mechanically connected to a Rotary switch C79D connected to the motor (85) is; C91) D. One with the control circuit / and the rotary switch (79) of the remote-controlled channel selection - 14 - 509848 / 0A30 means (11) coupled to the remotely or manually operated switching means (5) for Initiating the follow-up of manual channel selections by said means (9) for the remote-controlled Signal selection. 2. An electronic channel selection system according to claim 1, characterized in that the means for manual channel selection (7) has several parallel-coupled channel display and selection means, each of which has a channel selection switch C 73 D, the the junction of a series-connected diode C67) and neon lamp (69) couples to the voltage source (B +), and an adjustable resistor (77), which is coupled to the neon lamp (69) via a transistor (75), and a wiper, connected to the varactor tuner. 3. An electronic channel selection system according to claim 1, characterized in that the remote or manually operated Switching means (5) contains a bistable switching means (27) which is connected to the manually operated Channel selector (7), to the control circuit of the remote-controlled channel selector (9) and to a switching relay (13) of the remote or manually operated switching means (5) is coupled. 4. An electronic channel selection system according to claim 3, characterized in that it contains a gate circuit (56) which is connected to the control (91)
circuit * of the remote-controlled channel selector (9) - 15 - 509848/0430 and to the bistable switching means (27) is coupled to the excitation of the remotely or manually operated Switching means (5) according to the received from the remote-controlled signal selection means (9) To effect signals. 5. An electronic channel selection system according to claim 1, characterized in that the means for tracking (11) the manual signal channel selection (7) through the remote-controlled channel selector a transistor (113) contains, one input electrode of which via a diode (117) to the means (7) for hand-operated Switching is coupled, the other input electrode to the rotary switch (79) and is coupled via a diode (119) to the means (5) for remotely or manually operated switching, and its output electrode via a diode (123) to the control circuit (91) of the remote-controlled Channel selector (9) is coupled. 509848 / 0A30 Blank page