EP0739550A1 - Procede et circuits pour la reception d'emissions de radiodiffusion - Google Patents

Procede et circuits pour la reception d'emissions de radiodiffusion

Info

Publication number
EP0739550A1
EP0739550A1 EP94915044A EP94915044A EP0739550A1 EP 0739550 A1 EP0739550 A1 EP 0739550A1 EP 94915044 A EP94915044 A EP 94915044A EP 94915044 A EP94915044 A EP 94915044A EP 0739550 A1 EP0739550 A1 EP 0739550A1
Authority
EP
European Patent Office
Prior art keywords
transmitter
signal
alternative
comparison
reception
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.)
Withdrawn
Application number
EP94915044A
Other languages
German (de)
English (en)
Inventor
Jens Hansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HuC Elektronik GmbH
Original Assignee
HuC Elektronik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HuC Elektronik GmbH filed Critical HuC Elektronik GmbH
Publication of EP0739550A1 publication Critical patent/EP0739550A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/183—Automatic scanning over a band of frequencies combined with selection between different stations transmitting the same programm, e.g. by analysis of the received signal strength

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a circuit arrangement for broadcast reception.
  • the invention is based on the object of specifying a method and a circuit arrangement for radio reception in which - in particular without a noticeable interruption of the current program - information can be obtained as to whether at least one further receivable station has the same program as the set station , ie broadcasts the same program information (simultaneously) at the same time, so that switching can take place essentially imperceptibly.
  • the method according to the invention for radio reception in which the program equality of a radio transmitter with a comparison transmitter, ie the presence of a matched program information transmitted at the same time, is checked, includes the idea that during the reception of the comparison transmitter - in particular using one and the same Receiving part - directly the LF modulation - in particular an LF voltage value or simply the polarity - of this transmitter with that of the comparing the current transmitter briefly, so that, in particular, a reliable statistical statement can be obtained from a large number of comparisons.
  • a circuit is provided in the receiver which compensates for these delay times when evaluating the signal and thus program correspondence. Either temporary storage or a compensating delay in running time can be considered.
  • the method according to the invention is further distinguished, in accordance with a preferred development, in that after the comparison transmitter has been set at predetermined time intervals in the receiving part, the reception frequency is briefly adjusted to the transmission frequency of the transmitter to be tested and a signal sample characterizing its LF modulation obtained and the signal samples thus obtained are compared with signal samples of the comparative transmitter registered in essentially the same way (ie by means of a similar signal processing) at different points in time within a predetermined time frame and the comparison result is subjected to statistical processing, in its result result is obtained a statement on the agreement or non-agreement of the transmitted information, a corresponding signal being generated in the event of the agreement.
  • a signal sample of the potential alternative transmitter is taken in a comparison step, but several signal samples of the comparison transmitter for the first are taken at different time intervals, the time is advantageously minimized which is to be switched over to the transmitter to be checked in order in this way to reduce the possible impairment when tracking the current program to an imperceptible level.
  • the comparison described is expediently carried out with intermediate storage of a number of signal samples from the comparison and / or the potential alternative transmitter, as a result of which the total time required for a comparison cycle is kept short.
  • the statistical processing will advantageously include a summation of the comparison results obtained with the same time intervals and the evaluation of the shape of a distribution curve resulting from the summation.
  • the alternative transmitter is set.
  • the solution according to the invention is advantageous in that - in contrast to the use of the RDS transmitter identification, only a relatively small reception field strength is ahead, so that high-quality receivers can be capable of receiving the program of a transmitter in a qualitatively acceptable manner without having to decrypt its RDS identifier.
  • the method according to claim 3 has the following advantages:
  • a transmitter with the same program as a set transmitter is recognized regardless of the assignment and transmission and receipt of a transmitter identifier.
  • the time intervals which are required for obtaining the test signal of the potential alternative transmitter are kept very short, and the entire test and setting cycle can be carried out in a short time.
  • a voltage value of the low-frequency signal is advantageously recorded and used as the low-frequency signal value of the comparison transmitter (optional transmitter) or of the transmitter to be tested (potential alternative transmitter).
  • the respective voltage value of the LF signal is expediently subjected to digitization using a predetermined sequence of quantization stages before use.
  • the step of obtaining an LF signal sample from the transmitter to be tested is carried out in such a way that this step is not audible.
  • this is achieved in that the duration of the execution of the step is equal to or less than 50 ⁇ s.
  • the inaudibility of the switchover to the transmitter to be tested can be achieved in that the NF signal of the comparison or election transmitter during a period before the step of obtaining the NF signal sample of the transmitter to be tested (potential alternative transmitter) , which is equal to the time span of its execution, and this stored LF signal during the execution of the step as LF replacement signal is provided for audio processing.
  • the time range specified for the execution of the modulation match check is at least equal to the sum of the maximum expected negative and positive runtime Modulation difference of all transmitters receivable in the reception area is set.
  • step h) in the sequence of steps mentioned above comprises 10 to 50 repetitions of steps b) to g) that m.a.W. 10 to 50 comparative measurements can be carried out and evaluated.
  • a number of 40 cycles is particularly practical in terms of both the reliability of the information obtained and the limitation of the duration of a test procedure.
  • steps b) to i) are repeated for the alternative transmitter or transmitters, the result of step i) according to predetermined criteria for characterizing the current reception quality of the alternative transmitter (s) is used, and preferably based on this characterization a decision is made to switch to one of the alternative transmitters.
  • steps b) to i) are repeated for the alternative transmitter or transmitters at regular intervals (as a background query) during reception of the election transmitter, the result of step i) in each case according to predetermined criteria Characterization of the current reception quality of the alternative transmitter (s) is used and, based on this characterization, a statement or a ranking of the susceptibility as a basis for a decision to switch to one or the alternative transmitter when compared to an alternative transmitter lower reception quality of the election transmitter is provided.
  • step c) in the result of which an alternative transmitter signal is obtained below a predetermined minimum signal level, the subsequent steps are not carried out, ie the cycle here lacks one sufficiently meaningful comparison signal is terminated, and instead steps b) and c) are repeated until an alternative transmitter signal exceeding the minimum signal level is obtained, and that the subsequent steps are then carried out, one terminated according to c) ne sequence of steps in the sense of step h) does not count as a repetition, ie the test process is extended by the partial cycles which have been terminated without result.
  • the number of registrations of main transmitter signal values in step b) which are below the minimum signal level specified for the alternative transmitter can be recorded, and this number can be compared with the number of steps c) after which the sequence of steps was terminated and the comparison result according to predetermined criteria can be used as an auxiliary statement regarding the program identity of the election and potential alternative station.
  • step c) a measure of the reception quality of the / an alternative transmitter.
  • step i) a measure of the reception quality of the / an alternative transmitter - a pronounced maximum at least tends to speak for good reception quality.
  • This also opens the way to a program type selection of stations - for example, according to the language program / music program.
  • the apparent jumps in the transit time of the LF signal may be advantageous if a total sequence of steps b ) to j) is subdivided into several partial sequences, step i) being carried out in each case after the completion of a partial sequence and the respective statements as to whether and under which / which address (es) are used for the partial sequence in this step Maximum agreement was determined, be subjected to logical processing, the result of which is the statement j1) or j2).
  • steps c) and d) are at least two times apart of a fraction of the 38 kHz carrier period and / or the 19 kHz carrier period having short sub-steps, which meanwhile switches back to the selection transmitter, and that the arithmetic from the at least two signal values obtained Formed means and this is fed as an alternative transmitter value for further processing in the subsequent steps.
  • two partial steps can be carried out at intervals of half a 38 kHz carrier period.
  • the entire method can also be carried out as a “background query” during the listening reception of a third transmitter are, ie in short periods of time in which the listener hears the program of this third transmitter, the reception frequency of which is also derived from the same individual receiving part which also supplies the frequency for comparison and alternative transmitters.
  • Separate oscillators can be used to generate the required reception frequencies, which contributes to the implementation of a very short test time interval as a result of the rapid switchover without transient processes.
  • the oscillation frequency of the oscillator for receiving the alternative transmitters and possibly also that of the oscillator for receiving the third ("foreground") transmitter lie outside the transmission frequency band and the reception frequency is obtained from this by frequency conversion, in particular frequency division.
  • At least two or even all reception frequencies are used to generate and uses the same oscillator that is switched between the respective reception frequencies.
  • the term “reception frequency” stands in the sense of the frequency corresponding to a specific transmission frequency to which the receiving part is tuned, or for the oscillator frequency required to generate this frequency in the HF mixing stage.
  • a circuit arrangement for checking a broadcast transmitter for program equality with a comparison transmitter, i.e. the presence of a concurrently transmitted matching program information has the elements specified in claim 27.
  • a circuit arrangement for optimizing the radio reception using this arrangement additionally has an evaluation device for evaluating the reception quality of the set transmitter and the alternative transmitter and for outputting a corresponding signal, for automatic operation of a control signal for switching the reception frequency of the transmitter with the better reception quality on the HF mixing stage.
  • such an arrangement also has a frequency memory for storing the frequency of a transmitter identified as an alternative transmitter, which can thus be called up immediately if required.
  • the device for generating the second reception frequency is a second oscillator circuit.
  • the device for generating the second reception frequency is a device for switching over the oscillation frequency of the (single) oscillator circuit, which has to ensure that the settling to the new frequency is very fast - preferably within one or a few Microseconds - follows.
  • the frequency memory is assigned a priority allocator, which is connected to the output of the evaluation device and which assigns stored frequencies a priority derived from the current reception quality, so that a switch is made to the transmitter with the best quality.
  • the processing and identification device has an adding device for summing up a predetermined number of comparison results.
  • An advantageous combination of modulation test and reception quality check is achieved by connecting an input of the evaluation device to the output of the device for digitizing the LF signal and designing the evaluation device such that the signal values of the LF signal of the Comparison transmitter and the transmitter to be checked in the evaluation of the reception quality.
  • an input of the evaluation device can be connected to the output of the processing and Identification device connected and the evaluation device be designed so that the result of the evaluation of the comparison results is included in the evaluation of the reception quality.
  • the control device expediently comprises a program memory and a clock generator for specifying a program sequence for actuating the first in coordination with the second switching device and for controlling the comparison device and the processing and identification device for carrying out a modulation comparison checking station with the comparison station.
  • means are provided for generating the third reception frequency, and the switching device must be designed to feed all three reception frequencies to the HF mixing stage.
  • a third LF signal memory connected via a third switching device to the output of the LF stage and one Fourth switching device arranged downstream of this and the NF stage, with which, upon a command from the control device, the LF signal of the transmitter provided for audio processing is stored for a predetermined period of time and later instead of after switching through the second (or also first) ) Receive frequency on the HF mixer at the output
  • the LF signal of a transmitter not provided for audio processing of the LF stage, the stored LF signal of the third transmitter or of the selection transmitter can be switched through for further audio processing.
  • FIG. 1 is a block diagram of a circuit arrangement for radio reception according to an embodiment of the invention
  • FIG. 2 shows a schematic basic illustration of the overall sequence of the method according to the invention for radio reception according to one embodiment
  • FIG. 3 shows a diagram of the step-by-step construction of a distribution curve of the comparison results of signal comparisons of signal samples from a comparison transmitter and a transmitter to be tested, which distribution curve is used to identify the program equality in the embodiment of the method according to FIG. 2,
  • FIG. 1 schematically shows a circuit arrangement for carrying out the method according to the invention in a first embodiment. The operation of the arrangement is explained below.
  • the RF sum reception signal U jj p received via an antenna 1 passes via an antenna coupling stage 2 and an RF preamplifier 3 to an RF mixing stage 4, which also via a switch S1 either directly with a first tunable oscillator circuit 01 or via a frequency divider F can be connected to a second tunable oscillator circuit 02 which oscillates outside the VHF frequency band.
  • the output of the HF mixer stage 4 is connected to an IF decoupling stage 5, the output of which is connected to a IF stage 6 shown as a block is connected, its output is connected to a demodulator 7 and its output is connected to an NF stage 8, which is also shown in highly schematic form as a block.
  • the antenna coupling stage 2, the HF pre-stage 3, the HF mixing stage 4, the two oscillator circuits 01 and 02, the frequency divider F, the switch S1 and the IF coupling-out stage 5 form an FM-FM tuner T.
  • the LF signal U NF present at the output of the LF stage 8 is on the one hand, via a switch S2, optionally the input of a FIFO signal memory 9 and, on the other hand, an evaluation to be described below and on the other hand via a switch S3 optionally for further processing in (not shown) audio stages supplied.
  • the LF signal intended for further evaluation within the scope of the method according to the invention passes via a node K upstream of the switch S3 to a serial A / D converter 10 with threshold characteristics, which in the present example is designed in such a way that LF signal components positive polarity above a predetermined voltage value the output value "1" of the A / D converter and LF signal components of negative polarity above a certain voltage value are assigned the output value "0", while signal components with a value between the predetermined positive and the predetermined one Negative voltage value level are not subjected to digitization, ie no value is output for such signal components.
  • the output of the A / D converter 10 is connected to a first evaluation unit 11 and, via a switch S4, optionally to the input of a serial memory 12a - the selection transmitter signal memory - or the input of a one-bit memory 12b - the alternative transmitter -Signalspei ⁇ chers - connectable.
  • the output of the first evaluation unit 11 is connected to a signal input of a microprocessor MP which controls the entire arrangement and whose individual functions will be described below.
  • the outputs of the selection transmitter signal memory 12a and of the alternative transmitter signal memory 12b are connected to the signal inputs of a comparator 13 which has a control input (via a control line (not shown for reasons of clarity) connected to a control output of the microprocessor MP) and its output with a combined adder / serial memory 14 - the comparison result memory - is connected.
  • the output of the comparison result memory 14 is connected to the input of a second evaluation unit 15 and the output thereof is connected on the one hand to a control input of the microprocessor MP and on the other hand to a control input of a direct access memory (RAM) 16 - the transmission frequency memory.
  • RAM direct access memory
  • the data input and the data output of the transmission frequency memory 16 are connected to the second one via a switch S5
  • Oscillator circuit 02 connected while a control input of the transmission frequency memory 16 is connected (via a control line, again not shown) to a control output of the microprocessor MP.
  • a priority assignor (pointer) 17 is assigned to the transmit frequency memory 16, the data input of which is connected to the output of the first evaluation unit 11, the address input of which is connected to the output of the evaluation unit 11 in parallel with the address input of the transmit frequency memory and which is also connected to has a control output connected to a control output of the microprocessor.
  • a clock 18, a program memory (ROM) 19, a data memory with direct access (RAM) 20 and an input and control unit 21 are assigned to the microprocessor MP in the usual way. These components, together with the microprocessor MP as the core, form the control computer MC of the arrangement shown.
  • the circuit arrangement also includes a digital display unit 22 for displaying the reception frequencies, control commands, operating states, etc., the inputs of which are connected to the outputs of the oscillator circuits 01 and 02 and the microprocessor MP.
  • the first oscillator 01 is set to the transmission frequency of this transmitter when the switch S1 is in the upper position and the switch Sl the HF mixer stage 4 is supplied and the received signal is subjected to the usual processing by the VHF tuner T, the IF stage 6 and the LF stage 8, which ends with the provision of an LF signal at the output of the LF stage 8. (The processing of the LF or audio signal in subsequent filter, tone control and amplifier stages is disregarded here.)
  • LF signals are prepared in the form of amplitude-tudenfU jj) time-charts in Fig. 4 (a) to (f) darge, will be returned to hereinafter.
  • the LF signal tapped at node K is - as illustrated schematically in FIG. 2 (a) - under control by the microprocessor MP over a time range of approximately 6.5 ms at uniform time intervals at the times t j , t 2 , ..-, t n- 1 initially 16 select transmitter signal samples WS, each of about 50 ⁇ s in duration, and digitized in the serial A / D converter 10 in the manner described above.
  • the sampling program is stored in the ROM 19 of the control computer unit MC, while the time range, the time intervals and the duration of the registration of the signal samples can be stored in the RAM 20 and are matched to typical - for example country-specific - reception conditions.
  • the selected time range of 6.5 ms is based on a maximum transit time modulation difference of +/- 5 ms under Central European FM reception conditions.
  • the digitized signal values are switched via the switch S4 in the upper position in this phase successively transmitted to the serial selection transmitter signal memory 12a and stored there.
  • the switch S2 which connects the output of the LF stage 8 with the LF, is closed 50 ⁇ s before the start of the next scanning process (at the time tn) for a period of likewise 50 ⁇ s
  • Signal latch 9 connects, and a portion of the LF signal is stored in it.
  • the second oscillator circuit 02 is set to the frequency of the transmitter closest to the selected transmitter ("potential alternative transmitter") and the second oscillator circuit by switching the switch S1 to the lower position for a time span of approximately 50 ⁇ s connected to the HF mixer 4.
  • the received signal of the potential alternative transmitter is now fed to the further processing in the tuner T, the IF stage 6 and the NF stage 8 instead of the originally set optional transmitter, and a corresponding LF signal of the potential alternative transmitter ⁇ reaches node K.
  • the microprocessor control has opened the switch S2 again and brought the switch S3 into the upper position connecting the LF signal memory 9 with the subsequent stages (not shown), so that instead of the LF currently present at node K Signal of the potential alternative transmitter of the previously stored signal section of the selection transmitter NF signal is fed to the further audio signal processing and a possibly occurring interference is minimized ("noise canceling").
  • the NF signal of the potential alternative transmitter now comes from the node K to the A / D converter 10, where, if it is above a signal threshold or minimum amplitude, a one bit thereof Signal is obtained, which is fed to the alternative transmitter signal memory 12b via the switch S4 which has now been switched to the lower position, and at the same time the digitized signal reaches the evaluation unit 11, the input of which is released by the microprocessor at this point in time, and is there under one the address currently assigned to the potential alternative transmitter present.
  • the recorded signal of the potential alternative transmitter is below the predetermined signal threshold, it cannot be digitized in the A / D converter and no output signal can be emitted by it. This is due to the tax Purity MC registered, which then aborts the current cycle, deletes the content of the election transmitter signal memory 12a and starts a new cycle: however, if a usable alternative transmitter signal was registered and stored, the entire arrangement is switched back to further reception of the election transmitter , ie the first oscillator circuit 01 is switched back to the HF mixing stage 4 via the switch S1, the output of the LF stage is connected again to the subsequent audio stages via the switch S3 and the A / D converter 10 becomes reconnected to the selection transmitter signal memory 12a via the switch S4.
  • another 16 signal samples of the selection transmitter NF signal are then taken at the same time intervals and corresponding to the first extraction cycle and are stored in serial form in the selection transmitter signal memory 12a in the manner described for the first cycle in digitized form .
  • the input of the A / D converter is then temporarily blocked by the microprocessor, the comparator 13 is activated and the data in the signal memories 12a and 12b are fed to the comparator, the individual sample value of the signal of the potential alternative transmitter stored in the memory 12b is constantly applied to one input of the comparator and the individual bits of the 32-bit word in the memory 12a are fed serially to the other input.
  • the agreement or disagreement with is determined for each bit of the signal sample of the election transmitter the signal sample of the potential alternative transmitter is checked and each result (“1” for agreement, “0” for non-agreement) is stored individually in the adder / comparison value memory 14 under the address corresponding to the time at which the signal sample was taken.
  • FIG. 2 (b) shows how the sampling cycle AZ of 13.5 ms resulting from FIG. 2 (a) fits into a scheme of 14 repetitions. If, after averaging over these sampling cycles, an accumulation of the matches for a specific time offset is found, a program match can be assumed. Since a signal sample is only taken for a short time from the alternative transmitter while the majority is being removed from the current program, interruptions are hardly disturbing.
  • the overall cycle GZ of a modulation test with respect to a signal sample shown in FIG. 2 (b) takes about 600 ms in the example shown.
  • 2 (c) shows how several total cycles can be combined to form a measurement sequence, which, for example, concern several alternative transmitters transmitting on different frequencies. The total cycles for different frequencies follow at intervals, so that the process takes a few seconds.
  • FIG. 3 (a) in which the amplitude profile of two identical, but phase-shifted LF signals as a function of time is outlined together with the information present in the result of the first sampling cycle described above.
  • the election transmitter signal is drawn with a solid line, while the alternative transmitter signal is drawn with dash-dotted lines.
  • the black bars directly below the LF signal curves denote areas in which the voltage values of the election transmitter signal have positive polarity.
  • the polarity of the selection transmitter LF signal is recorded and stored for the times t ⁇ to t n _ 1 .
  • the polarities of all optional transmitter signal samples are individually compared with the polarity of the alternative transmitter Signal sample compared at time t n , and the result (the bit sequence in the lower part of FIG. 3 (a) representing a first cycle) is stored in the adder / comparison result memory.
  • the distribution curve has a clear maximum, with which the potential alternative transmitter, which has been checked for modulation and thus program equality, can be recognized as a transmitter that actually broadcasts the same program, that is to say, literally, as an "alternative transmitter".
  • This evaluation takes place in the second evaluation unit 15 connected downstream of the adder / comparison result memory and, in the case of a positive evaluation result - as in the example - transmits a control signal to the transmission frequency memory 16, which then stores the frequency set on the second oscillator circuit 02 at a first address. This is thus on call - for example in the event of a disruption or deterioration in reception of the election transmitter - as a second reception frequency for the set program.
  • FIG. 4 (a) to (f) are three examples of distribution curves of transmitters based on 40 sampling cycles each with the same program information (FIG. 4 (d) to (f)) and different program information (FIG. 4 (a) to (c) juxtaposed.
  • the frequency set on the oscillator circuit 02 is not stored, but the next station worthy of reception is set as a potential alternative station and the entire procedure is repeated for this, etc., until a station with the same program information is found or the FM band is fully scanned.
  • This procedure is outlined schematically in FIG. 2 (c).
  • the process can be terminated or continued until the frequency band has been scanned completely, in order to find further transmitter stations with the same program, if necessary. This are then stored under a different address in the frequency memory 16.
  • the reception quality can be assessed using the data recorded during the modulation test.
  • the control unit MC transmits a signal to the evaluation unit 11 at every sampling time t n , regardless of whether it has also received an output value from the A / D converter 10 or not.
  • the total number of signals in a cycle is counted.
  • the number of output values of the A / D converter temporarily stored in the first evaluation unit in each sampling cycle is determined, and the ratio of the two numerical values is the quantity sought.
  • the transmitter according to FIG. 4 (e) would therefore be rated the highest with regard to the reception quality on the basis of this criterion.
  • an A / D converter is used which not only converts the recorded LF signal values into values according to their polarity
  • FIG. 5 (e) shows the memory content of the adder / comparison result memory after the fourth cycle.
  • the arrows pointing downward in each partial illustration designate points of agreement of the amplitude values of the selection and alternative transmitter signal on the time scale.
  • a value "1” is written into the addresses corresponding to these times in the comparison result memory, while all others Time grid points each have the value "0".
  • the bit sequence according to FIG. 5 (e) results with a maximum at the time t n _ 2 , which speaks for modulation and thus program identity.
  • Such wandering would appear in an overall distribution as an indication of several maxima - for example as shown in FIGS. 6 (d) to (f) in comparison with three distributions without a maximum in FIGS. 6 (a) to (c) - or in In the worst-case scenario, the complete "smearing" of the distribution can have the effect that it can give the incorrect impression that the program content of the selected and potential alternative station is different, and thus make it impossible to recognize the latter as a genuine alternative station.
  • the modification mentioned does not require any change to the arrangement shown schematically in FIG. 1, but only a modification of the evaluation unit 15 and the control program of the microprocessor.
  • a further modification of the exemplary embodiment consists in that the signal values of the alternative transmitter are not determined in one sampling interval (of approximately 50 ⁇ s), but rather at two successive sampling "times" (periods of a few ⁇ s) which are spaced apart by half a period of the 38th -kHz stereo carrier, ie of about 26 ⁇ s, from each other, and that the arithmetic mean is formed from the two values and this is used as a basis for further processing.
  • This modification is expediently implemented by inserting a latch ("latch”) and an assembly for averaging between the node K and the A / D converter 10 in FIG. 1.
  • a further modification provides for the adder / comparison value memory to be queried after about 10 to 15 sampling cycles in order to determine whether there are any signs of a maximum being formed in the distribution curve and to abort the test process if no formation of a maximum is recognizable.
  • This design also has the advantage that commercially available receiving parts can be used without significant changes.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon un procédé pour la réception d'émission de radiodiffusion, la fréquence de réception d'une partie de réception est accordée sur différentes fréquences d'émission. Afin de vérifier si le programme d'un émetteur de radiodiffusion (émetteur de contrôle), sur lequel la partie de réception est accordée, coïncide avec le programme d'un autre émetteur (émetteur de remplacement potentiel), c'est-à-dire afin de vérifier si les informations transmises par les deux émetteurs coïncident les unes avec les autres, on utilise une seule partie de réception dont la fréquence de réception est accordée sur l'émetteur de contrôle, puis est accordée temporairement plusieurs fois à des intervalles prédéterminées sur la fréquence d'émission de l'émetteur de remplacement potentiel. A chaque fois, un échantillon de signaux caractéristique de la modulation basse fréquence de l'émetteur de remplacement potentiel est extrait et les échantillons de signaux ainsi obtenus sont comparés à des échantillons des signaux de l'émetteur de contrôle enregistrés sensiblement de la même manière à différents moments à l'intérieur d'un laps prédéterminé de temps. Le résultat de la comparaison est traité afin de déterminer si les modulations, donc les informations transmises par l'émetteur de contrôle et par l'émetteur de remplacement, coïncident les unes avec les autres, un signal étant généré lorsqu'une coïncidence est constatée. L'invention concerne également des circuits de mise en ÷uvre de ce procédé.
EP94915044A 1993-05-16 1994-05-16 Procede et circuits pour la reception d'emissions de radiodiffusion Withdrawn EP0739550A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19934316687 DE4316687A1 (de) 1993-05-16 1993-05-16 Verfahren und Schaltungsanordnung zum Rundfunkempfang
DE4316687 1993-05-16
PCT/DE1994/000581 WO1994027368A1 (fr) 1993-05-16 1994-05-16 Procede et circuits pour la reception d'emissions de radiodiffusion

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EP0739550A1 true EP0739550A1 (fr) 1996-10-30

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EP (1) EP0739550A1 (fr)
DE (1) DE4316687A1 (fr)
WO (1) WO1994027368A1 (fr)

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JP3588175B2 (ja) * 1995-11-29 2004-11-10 パイオニア株式会社 波形同一識別回路
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