EP0119280B1 - Décodeur à circuits intégrés de signaux radioélectriques d'identification de zones de trafic - Google Patents
Décodeur à circuits intégrés de signaux radioélectriques d'identification de zones de trafic Download PDFInfo
- Publication number
- EP0119280B1 EP0119280B1 EP83102412A EP83102412A EP0119280B1 EP 0119280 B1 EP0119280 B1 EP 0119280B1 EP 83102412 A EP83102412 A EP 83102412A EP 83102412 A EP83102412 A EP 83102412A EP 0119280 B1 EP0119280 B1 EP 0119280B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- output
- input
- comparator
- whose
- digital
- 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
Links
- 238000005070 sampling Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/091—Traffic information broadcasting
- G08G1/094—Hardware aspects; Signal processing or signal properties, e.g. frequency bands
Definitions
- the invention relates to an integrated circuit for decoding traffic radio area identification signals, the frequency, the area frequency, of which is information about the area, the area identification signals being contained in the form of a carrier signal amplitude-modulated therewith in a received radio signal already demodulated in a conventional radio receiver, cf. . the preamble of claim 1.
- the traffic radio signal contains area identification signals.
- area identification signals the frequency of which is the information about the area as the area frequency, are quite low-frequency signals and are modulated onto the transmitter identification carrier signal by means of amplitude modulation, which in the known system has a frequency of 57 kHz, and are otherwise derived from the carrier signal by integer frequency division.
- the block diagram of an integrated circuit for decoding traffic information signals according to the invention is shown in FIG. 1.
- the demodulated radio signal ds which is obtained by means of a conventional radio receiver, is fed to the mixer stage ms, whose mixed signal frequency fm is greater than the largest range frequency fb.
- the mixing stage ms the area identification signals modulated onto the carrier signal are converted to the mixed signal frequency fm.
- the output of the mixer stage ms is via the analog low-pass filter af at the input of the analog / digital converter aw.
- the output of the analog / digital converter aw is also at the first input of the multiplier m, the second input of which is at the output of the digital clamping circuit kl, which is downstream of the digital bandpass filter bp in terms of signal flow. It clamps positive or negative input signals to the positive or negative maximum value specified by their number of digits.
- the analog / digital converter aw which must then be a delta-sigma converter, can directly follow the mixing stage ms,
- the digital low-pass filter df must then be arranged between the input of the digital bandpass bp and the output of the analog-digital converter aw.
- the mixed signal is recovered by means of the digital bandpass, and it is amplitude-normalized by means of the digital clamping circuit kl.
- the area identification signals are then demodulated by means of the multiplier m.
- each signal path in the signal flow direction consists of the digital resonance filter ra, rb, rf for the respective range frequency fb, the digital absolute value generator ba, bb, bf and the digital low-pass filter pa, pb, pf, whose upper limit frequency is less than twice the smallest range frequency.
- this lowest range frequency which is assigned to range A there, has a value of 23.75 Hz.
- the three arranged in signal path a, b, f Subcircuits have the function of a selective level measurement.
- One of the outputs of the low-pass filters pa, pb, pf is connected to one input of the multiple comparator vk, at the first maximum output mx1 of which a signal occurs via the signal path that carries the largest signal, i.e. a digital word for the number of the signal path with the largest signal value appears at the first maximum output mx1. In the same way appears on the second maximum.
- Output mx2 a signal about the number of the signal path that carries the second largest signal.
- the first and the second maximum output mx1, mx2 is located at the control input of the first and the second electronic multiple switch s1, s2, the inputs of each of which at one output de; Low passports pa, pb, pf is connected.
- the two multiple switches s1, s2 thus have as many inputs as there are signal paths, and from the output signals at the maximum outputs mx1, mx2 they are switched to the signal path which carries the largest or the second largest signal value.
- the output of the first multiple switch s1 is on the one hand via the first constant multiplier m1 at the minuend input of the first comparator kl, to the subtrahend input of which the output of the multiple adder ad is connected. Its inputs are located at the output of one of the low passes pa, pb, pf.
- the output of the first multiple switch s1 is also via the second constant multiplier m2 at the minuend input of the second comparator k2, to the subtrahend input of which the output of the second multiple switch s2 is connected.
- the second comparator k2 and the second constant multiplier m2 are used to determine whether the amplitude of the first maximum signal multiplied by a constant factor is greater than the second maximum signal.
- the level of the first maximum signal is compared in a comparable manner with the sum of the signal values of the other signal paths, which is a signal-to-noise ratio measurement.
- the delay element vg is located at the first maximum output mx1 of the multiple comparator k and at the output thereof the minuend input of the third comparator k3, the subtrahend input of which is connected to the first maximum output mx1.
- the minuend-equal-subtrahend output of the third comparator k3 is connected via the inverter it to the reset input er of the counter z, the counter input of which is supplied with the clock signal t and the counter outputs of which are connected to the minuend input of the fourth comparator k4, the subtrahend input thereof the constant k serving as the threshold value is supplied.
- the output of the digital bandpass by is followed by the further amount generator bw, which is followed by the further digital low-pass filter pw, the upper limit frequency of which is equal to that of the low-pass filters pa, pb, pf and the output of which is via the third or fourth constant multiplier m3, m4 is located at the subtrahend input of the fifth or sixth comparator k5, k6, whose respective minuend input is connected to the output of the first multiple switch s1.
- the minuend-larger-subtrahend output of the fifth comparator k5 and the minuend-smaller-subtrahend output of the sixth comparator k6 are each connected to one of the two inputs of the first AND gate ul.
- the degree of modulation of the area identification signals is monitored by means of the last-mentioned subcircuits bw, pw, m3, m4, k5, k6, ul, because noise manifests itself as an increased degree of modulation and, on the other hand, an unmodulated carrier also frequently occurs as a disturbance.
- the first maximum signal is compared with the amplitude of the mixed signal with respect to an upper and a lower threshold, which are predetermined by the constants of the third and fourth constant multipliers m3, m4.
- the first maximum Output mx1 of the multiple comparator vk is at the parallel input of the multiple AND gate vu, the output of which is the area signal output sa of the integrated circuit, and the output of the second AND gate u2 is located at all points of the second parallel input of the multiple AND gate vu.
- the mixer stage ms which consists of the unit amplifier vl and the electronic switch s, the control signal of which is the mixed signal fm.
- the unit amplifier v1 has the gain 1 and, at its output, outputs an output signal rotated by 180 'with respect to its input signal, like a conventional analog amplifier.
- the radio signal ds which is also located at the input of the unit amplifier v1 is switched through directly to the output of the switch s, once and once in its form rotated by 180 °, that is to say inverted.
- the mixed signal fm is a square wave signal.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Circuits Of Receivers In General (AREA)
Claims (3)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP83102412A EP0119280B1 (fr) | 1983-03-11 | 1983-03-11 | Décodeur à circuits intégrés de signaux radioélectriques d'identification de zones de trafic |
| DE8383102412T DE3364612D1 (en) | 1983-03-11 | 1983-03-11 | Integrated circuit for decoding radio broadcast traffic area identification signals |
| JP59045725A JPS59175221A (ja) | 1983-03-11 | 1984-03-12 | 交通情報の地域ト−ン信号用デコ−ダ回路 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP83102412A EP0119280B1 (fr) | 1983-03-11 | 1983-03-11 | Décodeur à circuits intégrés de signaux radioélectriques d'identification de zones de trafic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0119280A1 EP0119280A1 (fr) | 1984-09-26 |
| EP0119280B1 true EP0119280B1 (fr) | 1986-07-23 |
Family
ID=8190338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83102412A Expired EP0119280B1 (fr) | 1983-03-11 | 1983-03-11 | Décodeur à circuits intégrés de signaux radioélectriques d'identification de zones de trafic |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0119280B1 (fr) |
| JP (1) | JPS59175221A (fr) |
| DE (1) | DE3364612D1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4969209A (en) * | 1987-07-27 | 1990-11-06 | Prs Corporation | Broadcast receiver capable of selecting stations based upon geographical location and program format |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2719618A1 (de) * | 1977-05-03 | 1978-11-09 | Koerting Radio Werke Gmbh | Schaltungsanordnung an einem integrierten pll-decoder |
| DE2916171A1 (de) * | 1979-04-21 | 1980-10-30 | Licentia Gmbh | Ueberlagerungsempfaenger |
-
1983
- 1983-03-11 DE DE8383102412T patent/DE3364612D1/de not_active Expired
- 1983-03-11 EP EP83102412A patent/EP0119280B1/fr not_active Expired
-
1984
- 1984-03-12 JP JP59045725A patent/JPS59175221A/ja active Pending
Non-Patent Citations (1)
| Title |
|---|
| RADIOMENTOR ELECTRONIC, Band 44, Nr. 12, Dezember 1978, Seiten 480-481, München, DE., E.O. BEDDIES: "Alpha 2000 - Autoradio-Entwicklungsstudie" * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0119280A1 (fr) | 1984-09-26 |
| DE3364612D1 (en) | 1986-08-28 |
| JPS59175221A (ja) | 1984-10-04 |
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