DE2149519C3 - Circuit for the digital control of current or voltage levels of operating functions in radio and / or television sets - Google Patents

Description

The invention relates to a circuit mentioned in the preamble of claim 1. Such a one Circuit is already known (Funk-Technik 1971, No. 9, pp. 330,332,333).

Up to now it was used to remotely control the operating functions of radio and television sets ;, common, everyone Allocate operating function its own control frequency. With the mostly common ultrasonic remote controls so each operating function has its own ultrasonic frequency. The disadvantage of this method is In addition to the extensive technical effort, the necessary adjustment of these frequencies, which both must be carried out on the ultrasound transmitter as well as on the ultrasound receiver. Since the forward and backward controls must each count as a separate function are used for remote control of Color television receivers z. B. at least eight different control frequencies required. It is also disadvantageous that such arrangements are not readily made in the integrated circuit art can, as the required inductances and in some cases the larger capacities have not yet been integrated.

From the magazine Funk-Technik 1969, No. 17, page 645 to 647 it is known to use short pulses for a pulse generator. However, one is pure here mechanical arrangement controlled and coding in the actual sense does not take place. In the invention however, it is also a purely electronic circuit.

According to the above-mentioned Funk-Technik 1971, No. 9, pages 330 to 333, a digital circuit for television receivers is also described, a digital counting circuit being provided, the levels of which appear one after the other as counting pulses at the counting input and a Konimando signal generates the counting pulses, which are sent over a common transmission path. This circuit, designed in the form of a ring counter, is only located in the receiver and cannot trigger any analog functions. It only switches to the channels (e.g. from »On« to »Off«). Volume, brightness, color saturation, etc., on the other hand, are controlled in the usual way by the remote control, ie they are influenced via potentiometers located in the remote control box, which are parallel ^{to the actual volume, h \: 'and color saturation control via a cable.}

It should also be noted that it is known per se that Carry out wireless transmission from the transmitter (encoder) to the receiver. So is z. B. in this context per se the use of optical signaling devices, e.g. B. in the form of light or Infrared signals by means of pulse-coded light (Siemens-Zeitschrift 1965, Issue 11, Suite 1245 to 1249) and the use of pulses of variable length in optical transmission systems (international electronic Rundschau 1966, No. 12, pages 681 to 687) as well as the use of audio frequency and coded Pulse signals in inductive transmission systems (Elektro-Anzeiger No. 17 of September 4, 1968, p 357 to 359) known.

After all, through the magazine Wireless World, April 1970, pages 175 to 177 circuit arrangements for digital (remote) control via cable or radio frequency connections of up to 15 circuits known, in which counting circuits or information memories are provided that at least as many have different outputs as different command signals are present. However are after This known arrangement does not provide any circuits that allow operation of operating or Allow analog functions (i.e. volume, brightness, color saturation, etc.) and where for each current and The voltage run of the digital analog converter is controlled by repeated impulses, for which purpose the Transmission side an automatically repeating clock of the digital pulse encoder must take place and where every coded signal must be reproduced in full to avoid incorrect evaluations or malfunctions to avoid on the receiving side. There are no measures specified for the receiving side as for the mentioned operating or analog functions (current or voltage levels) via a certain Command a control should take place.

In contrast, the invention is based on the object, in a circuit of the in the preamble of Claim 1 mentioned type not only to trigger on and off "sound functions through digital transmission, but also the operation of analog functions (volume, brightness, color saturation, Contrast) can be achieved with purely digital circuits that are icalized in integrated circuits permit.

This object is achieved according to the invention by the features mentioned in the characterizing part of claim 1. Further refinements of the invention can be found in the subclaims / i \ .

The advantages achieved by the invention are in particular that there are also analog operating functions (Volume, brightness, color saturation, contrast) can be carried out digitally and these circuits largely implemented in integrated technology and existing integrated circuits multiple times, if necessary also used in combinations, and known elements of digital technology, such as binary Counting chains, decoders and matrix circuits can be used. The overall circuit of both the receiver as well as the encoder can each be fully integrated and implemented in a circuit. This is both a given substantial reduction in the cost of the circuit as well as miniaturization.

Embodiments of the invention are shown in the drawing and are explained in more detail below described. It shows

Fig. I is a block diagram of a command signal generator according to the invention according to the invention! Circuit that emits the ultrasonic signal that is square-modulated with the command pulses,

2 shows a block diagram of the receiving part according to the invention with amplifier, demodulator, memory and decoder according to the circuit according to the invention.

The function of the digital command signal generator in the ultrasonic range is explained with the aid of the block diagram in FIG. When one of the command keys KT \ ... KTg, which can also be formed by galvanically or capacitively triggered contact or proximity switches, is pressed, the bistable electronic switch ESi is switched on immediately. The multivibrator MU then periodically supplies square-wave pulses U \ both to the input of the first counting flip-flop Fn of the binary counting chain BZK \ and to the monostable electronic switch ES2.

With the first positive rising edge of the first square pulse of the pulse series l! \, All outputs of the counting flip-flops F \\ ... F \ t of the binary counting chain BZK _x jump to the plus potential. The electronic switch ES2 is also switched on from the outputs of the flip-flops Fh and F ^ via the matrix circuit MA \ and in turn activates the ultrasonic oscillator LO, which is periodically switched off and on by the rectangular pulse sequence U \. The square-modulated ultrasonic signal is emitted by the ultrasonic transducer USG, which z. B. can be a barium titanate flexural transducer.

After the first pulse U \ has brought all flip-flop outputs to positive potential, the monostable electronic triple _{switch ES 3 is switched} on in the pulse pause via the switch-on pulse ίΛ of the bistable electronic switch ESi, which is delayed in the delay circuit VZ. So that the switch-on state is ended before the arrival of the second pulse of the series of pulses U \ , the delayed switch-on pulse lh is limited accordingly in its duration. B. can be achieved by differentiating. The connections distributed to the various contacts of the command keys KT \ ... AT ₈ with the aid of a diode or resistor matrix MA2 ensure that each time another command key is pressed , a different combination of the outputs of the flip-flops Fn, Fn and F | 3 can be switched to the ground potential via the monostable electronic triple switch ESj with the arrival of the delayed sound pulse U2. This means that counting processes are skipped before the second pulse of the pulse series U \ arrives and the switch-off process for the ultrasonic oscillator is achieved after a more or less reduced number of pulses, depending on which of the command keys KT \ ... KTg is pressed.

If none of the flip-flop outputs Fn. Fi2 or Fu is connected to ground, the eighth pulse from IA generates a switch-off position of the monostable electronic switch ES? Via the matrix circuit MA \, which also interrupts the operation of the ultrasonic oscillator. This switch-off position is reached earlier with all other matrix combinations. The criterion for switching off is the drop in the positive potential at the output of the flip-flop Fm to zero potential. Regardless of how this criterion is achieved, the binary counting chain continues to count normally from this moment on. After a further eight counting steps, the output of the flip-flop F15 falls from the positive potential to the zero potential and thus maintains the switched-off state of the monostable electronic switch ES2, which would otherwise be switched back to the switched-on position by the output of the flip-flop Fu. After an additional sixteen counting steps, a switch-off signal for the bistable electronic switch ESi appears at the output of the flip-flop Fi ₆ , which in turn finally rejects the entire arrangement when none of the command keys KT \ ... KT _S is pressed any more. However, if a key is still pressed, ESi is switched on again after a short pause, which depends on the time constants of the switch-on period, and the entire counting cycle starts again, even if the operation of the command key is interrupted after the delayed switching pulse Lh appears a complete command signal on the ultrasonic transducer USG.

The short pulse generated by differentiating the switch-off signal of a counter output thus leads to a brief switching off of the unstable electronic switch when a command button is pressed remains and a permanent shutdown if no command button is pressed, whereby the short-term or persistent shutdown country may cause the digital counter to be reset. With Each time a command key is pressed, a different default setting is made corresponding to the command signal of the counter has the effect that in the counting process that begins thereafter, the remaining count is a impulse number results, which corresponds exactly to the desired coding of the relevant command signal.

For this purpose, each command button can be equipped with a corresponding number of contacts to turn on the electronic switch and preselect the To be able to carry out counter setting electrically isolated. It is also useful to switch the to establish electrical connections through coupling or switching diodes or transistors, each of which can only be controlled by a contact on the command button.

In most applications it is advantageous if only one key is pressed briefly complete command signal is generated, if a key is pressed continuously, however, the associated one Command signal is repeated periodically as long as the key is pressed, but regardless of the At the point of interruption, a signal that has been started is completely terminated in each case.

The individual impulses of the command signals can be switched off and on functions via the wireless connection path, Modulation changes or frequency changes are transmitted sequentially. Likewise can the pulse combinations of the command signals also at least partially simultaneously via different ones Frequencies and / or types of modulation are transmitted.

The switch-on and possibly also switch-off pulses for the above-mentioned bistable Electronic switches can also be encoded in the command pulses and sequentially via

the common transmission path or transmitted simultaneously via other frequencies or types of modulation will. The switch-on and switch-off pulses can be distinguished from other pulses by their duration be made.

2 shows the block diagram of the receiving part of a digital ultrasonic remote control. The ultrasonic signal modulated with the command pulses is converted into electrical signals with the aid of the microphone Mi, which can also be a barium titanate transducer, and fed to the input of the amplifier V. FIG. After amplification and demodulation in the demodulator DEM , the recovered command signal Ui is the input of a binary counting chain

(digital counter) BZK ₂ and at the same time also fed to the input of the Univibrator UN. The univibrator is brought into its unstable switching position with the leading edge of the first pulse of the command signal t / 3 and falls back into its stable switching position after a time which corresponds at least to the expiry of the long-lasting command signal. Before that, however, the digital counter (binary counting chain BZK ₂ ) is controlled by the pulses Ui of the command signal into the counting position assigned to the signal, whereby the command signal is stored. Instead of the digital counter, capacitive or magnetic memories, shift registers or an electronic information memory can also be provided, these memory and decoding arrangements having at least as many different outputs or output combinations as there are different command signals. The other electronic switches (monostable electronic triple switches ESa) are briefly switched on by the switch-off edge Ua of the univibrator LW, which is differentiated into the pulse U in the differentiating circuit DIF , and delivers from the outputs of the counting flip-flops F ₂ i, F22 and Fn the potential stored there at the inputs 1, 2 and 3 of the decoder circuit DE, which is constructed like the known decimal decoder.Depending on the potential combination at the inputs, the desired signal appears at a certain one of the outputs A \ ... As , the duration of which is generally identical to the duty cycle of the monostable electronic triple switch

In front of the input 3 of the decoding circuit DE monostable electronic switch ES% of periodically with the pulses of an (NI) - is switched bursts and thus the weiterzugebende to the input 3 signal with this burst modulated All outputs of decoder DE which on its internal matrix associated with this input 3, deliver with this circuit (N- 1) burst for resetting the digital control circuits for operating functions. The burst generator BG is started each time here, if at the same time on the contact 3 'is a specific, for the further electronic switch (monostable electronic triple switches ESA). B. positive potential is switched through via the monostable electronic switch ESb .

The circuit example can, for. B. be designed so that with the single to eightfold pulses of the command signal, a positive trigger pulse appears at the outputs A \ to Ag for one operating step of the connected operating circuit

In more general terms, a binary-coded counting chain is provided in this arrangement for storing and decoding, which has a counting input for the coded command signal and its π outputs are connected to π inputs of a known decoding circuit, at whose 2 " outputs two switching states for each output Depending on the signals at the η inputs, only one output has a different status than all other 2 "-1 outputs, and the required 2" signal combinations at the η outputs of the binary counting chain are determined by the various pulse numbers of a command signal reached at the input of the counting chain.

With a corresponding coding of the command signal !, it is also possible to use just one counting chain for storage and decoding. For binary coding, such an arrangement, as can be seen, e.g. B. realized that a binary counting chain is used, the counting input of which command signals are supplied, each consisting of 2 ^Z pulses up to a maximum number of pulses 2 ^z max, where Z and Zmax are each a whole positive number and the counting chain preferably consists of Z. _max links with Z _max outputs.

In this arrangement, too, only one output has a different switching status than all the other 2 ^Z - 1 outputs, so that the respective command signal enables a clear differentiation of a selected operating function. In all these cases, a different output of the decoding circuit is switched over with each coded command signal, and a different operating function can be further controlled by one step with each signal repetition via each of these outputs. Because of the

sequential transmission of the command signals, however, the commanded operating step can only be triggered when the associated command signal has been completely stored and decoded. Therefore, in the decoding circuit, each output is connected via an electronic switch to the input of the associated counting circuit for generating the operating steps and the electronic switch is switched on at the earliest after the last pulse of a complete command signal has been saved and at the latest before the last pulse of the subsequent command signal is saved switched off. The electronic switch is located at the outputs Ai ... As and is specially drawn

For binary-coded systems, however, there is another possible arrangement, which consists in that the π outputs of the binary-coded counting chain BZK are connected to the η inputs of the known decoding circuit via η electronic switches, which are activated at the earliest after the last pulse of a complete command signal has been stored switched on and switched off before the last pulse of the following command signal is saved at the latest. Since the electronic switch is not located at the outputs Ai ... / 4g, but rather at the fewer number of inputs 1, 2, 3 of the decoding circuit DE , not 2 ", but only η electronic switches are required

According to the exemplary embodiment, the switch-off edge of the univibrator is differentiated, and that from it The resulting impulse is used to briefly switch on the electronic switch. The demands are higher When it comes to accuracy, it is more exact to use the Äbschsliflsr.kc of the one univibrator switch on the second univibrator whose longest switch-on time is shorter than the shortest pause between two command signals plus the duration of the shortest command signal and that with its Duty cycle also controls the switch-on time of the electronic switch

In order to enable the use of the (N- 1) countdown burst as proposed in German Patent 21 38 876 jointly for several operating arrangements, such a decoding arrangement is provided in which at least one of the electronic switches is additionally switched on with an (N- 1) -Burst is modulated according to German Patent 21 38 876 to reset the counting chains used for the operating functions.

The setting device for digitally influencing the operating functions can be parallel to the usual Setting device for these operating functions can be connected.

The transmission path can be completely or partially wireless. These wireless links can use light, high frequency, electrostatic, capacitive, magnetic, inductive, or acoustic Ultrasonic signals work.

For this purpose 2 sheets of drawings

Claims (13)

Patent claims: 1. Circuit for the digital control of current or voltage levels of operating functions in radio and / or television sets, with a digital counting circuit or a digital information memory being provided, the levels of which appear one after the other in one direction as counting pulses at the counting input and a command signal generates the counting pulses, which via sent a common transmission path and used to trigger the digital control of the operating functions, and wherein the counting circuit or the information memory has at least as many different outputs as different command signals are to be executed, characterized in that a digital counter (BZKy) is provided on an encoder cable for the transmission of analog functions is, and that each manually operated command key (KT \ ... KT _a ) this arrangement is assigned the preselection of a specific counting program which corresponds to the respective command signal, and that each command key (KTi. .. KTn) when actuated a common bistable electronic switch (ESi) turns on, which sets a common periodic pulse generator (Ml 1) in operation, whose pulses (L / i) the input of the digital counter (BZKi) and at the same time to an electronic switch (ES ₂ ) are placed in such a way that the sounding of this electronic switch (ESj) takes place at the first counted pulse and the switch-off after the end of the target program selected via the command key (KTi ... KTk) , while the pulse generator (MlJ) further, supplies pulses that no longer belong to the command signal to the counter input (BZKi) until the required length of the pause between two command signals, which is determined by the number of subsequent counting levels (Fib, BZKi) , is reached, and one of the subsequent count outputs ( Output of F ₁₆ ) or a combination of these, the disconnection of the bistable electronic switch (ESi) and thus also the pulse generator (MlI) as well the counter takes place, and that for decoding the η outputs of a binary coded counting chain (BZKi) with the η inputs (1, 2, 3) of a decoding circuit (DE) via η further electronic switches (1,! ', 2, 2', 3, 3 '- ES ₄ -), which can be switched on at the earliest after the last pulse of a full Koinmando signal has been stored and switched off at the latest before the last pulse of the subsequent command signal has been stored. 2. A circuit according to claim I. characterized in that / ur decoding of each output (Ai ... An) of the decoding circuit (DE) via an electronic switch (not shown) is connected to the input of the associated counting circuit for generating the operating steps, bo and that the electronic switch is switched on at the earliest after the last pulse of a complete command signal has been stored and can be switched on at the latest before the last pulse of the subsequent command signal is stored. tf 3. A circuit according to claim I or 2, characterized in that the time control of the further electronic switches (ESi or not shown ) takes place by a common univibrator (monoflop UN) , the switched-on position of the leading edge of the first pulse of a Kcmmandosignals (Uz) triggered, and the switch-on duration is selected so that its switch-off position occurs at the earliest after the last pulse of the long-lasting command signal (Lh) within the pause between two possible command signals, whereby the switch-off edge of the univibrator (UN) to switch on the other electronic switches (ES ₄ or . not shown) is used. 4. A circuit according to claim 3, characterized in that the switch-on edge of the univibrator (UN) is used to switch off the electronic switch. 5. A circuit according to claim 3, characterized in that the switch-off edge of the univibrator (UN) differentiates and this pulse is used for briefly switching on the further electronic switch (ES ₄ ). 6. A circuit according to claim 3, characterized in that the switch-off edge of the univibrator (UN) switches on a second univibrator whose longest on-time is shorter than the shortest pause between two command signals plus the duration of the shortest command signal, and that the second univibrator with its on-time also controls the switch-on time of the other electronic switches (ESa). 7. Circuit according to one of claims 1 to 6, characterized in that the switch-on and optionally also the switch-off pulses for the further electronic switches (ESn) are encoded in the command pulses (Ui) and sequentially over the common transmission path or simultaneously over others Frequencies or types of modulation can be transmitted. 8. A circuit according to claim 7, characterized in that the switch-on and switch-off pulse through their duration indistinguishable from other impulses are made. 9. A circuit according to claim I, characterized in that the switch-off signal for the bistable electronic switch (ESi) is a short pulse generated by differentiating the switch-off signal of a counting output (Fu ... Fib) , in such a way that et leads to a brief stopping of the bistable electronic switch (ESi) leads when a command button (KTi ... KT _K ) is pressed, whereby the short-term or permanent switch-off / state if necessary / to reset the digital counter (BZKi. b / w. not shown) use! is. 10. Sound system according to claim 9, characterized in that with each actuation of a command key (KTi ... KTn) a corresponding to the command signal. echende different presetting of the counter (BZKi) takes place in such a way that the remaining payment is received in the subsequent counting process; Pulse number results, which corresponds exactly to the desired coding of the relevant command signal. 11. A circuit according to claim 1, characterized in that the presetting of the digital counter (BZKi) takes place in the pause after the first pulse which is sent from the periodic pulse generator (MU) to the counting input. 12. Circuit according to one of the preceding claims, characterized in that the switching ment to generate the command pulses (F i g. 1) and / or the command keys (KT ... KT ₆ ) are present several times and act in parallel on the memory and decoding arrangement (Fig.2), so that the the same operating functions can be triggered. 13. Circuit according to one of the preceding claims, characterized in that the transmission link is fully or partially wireless. IO