WO1997024852A2 - Verfahren und anordnung zum erkennen von gebührenimpulsen in einer telefonanlage - Google Patents
Verfahren und anordnung zum erkennen von gebührenimpulsen in einer telefonanlage Download PDFInfo
- Publication number
- WO1997024852A2 WO1997024852A2 PCT/DE1996/002447 DE9602447W WO9724852A2 WO 1997024852 A2 WO1997024852 A2 WO 1997024852A2 DE 9602447 W DE9602447 W DE 9602447W WO 9724852 A2 WO9724852 A2 WO 9724852A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oscillation
- frequency
- trains
- modulation
- telephone system
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/28—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP with meter at substation or with calculation of charges at terminal
Definitions
- Charge pulses are pulse-shaped (sine) oscillation trains with an oscillation frequency (fG) of 12 kHz or 16 kHz. These are usually selected with a bandpass filter and then detected (Martin Hebel, handbook for self-dialing long-distance traffic, 1962, p. 146).
- fG oscillation frequency
- the charge impulses are modulated with a suitable modulation method in such a way that there is a spectral component at a frequency, in particular in the band range from 300 Hz to 3400 Hz, the modified charge pulse can be evaluated with the aid of a digital signal processor which uses a CoDec receives the signal sampled with only 8 kHz (the original charge pulse with the oscillation frequency fG requires a sampling rate> 32 kHz for digital evaluation, which requires a fast and expensive AD converter).
- This square wave signal for modulation is easy to generate.
- the spectral distribution of a periodic square wave signal can be calculated using the Fourier series.
- the fundamental wave of the square-wave signal, modulated with the charge pulse supplies the spectral component fA to be evaluated, where fA is the difference between fG and fR (e.g. 2 kHz).
- the effective value of the modified charge pulse is proportional to the effective value of the charge pulse.
- the oscillation trains of the charge pulses preferably modulated with a square wave signal.
- the frequency of this modulation signal is not constant, but preferably changes periodically between two values, one of which is below the oscillation frequency of the
- the times between two switching of the modulation frequencies must be longer than the evaluation times in the digital signal processor of e.g. 15 milliseconds.
- the signal processor therefore receives a 2 kHz signal for 15 milliseconds and then no signal for 15 milliseconds.
- the digital signal processor must reject such a pattern.
- the implementation of the frequency switching is relatively simple and does not need to bring any additional effort when generating the modulation frequencies in a PAL (Programmable Array Logic), which only has to be programmed differently.
- PAL Programmable Array Logic
- FIG. 1 a block diagram of an arrangement according to the invention for the detection of charge pulses
- FIG. 2 timing diagrams
- FIG. 3 a block diagram of a further arrangement according to the invention for the detection of charge pulses.
- the arrangement 1 shown as a block diagram for the detection of charge pulses is connected with its input 1 to the a / b wires of an outside line of a telephone system.
- the charge pulses are fed to a differential amplifier 2, from where they reach a bandpass filter 3 after amplification.
- Its output is connected on the one hand directly to an input of a modulator (MUX) 5, while on the other hand a second input receives the charge pulses from the bandpass 3 inverted via an inverter 4.
- the modulator 5 has another one for the modulation signal in the form of a square-wave signal R.
- Modified charge pulses 6 leave the output of the modulator 5, which arrive at a coder (CoDec) 7 to form a digitally sampled signal which is fed to a digital signal processor (DSP) 8, which is connected via a microprocessor interface ( ⁇ P interface) 9 a microprocessor works together.
- Coder coder
- DSP digital signal processor
- An analog switch in modulator 5 switches (controlled by the square-wave signal) between the original and the inverted signal (corresponds to multiplication with a square-wave signal without a DC component). 6. The output signal is now ready for evaluation.
- DSP digital signal processor
- the DSP first performs bandpass filtering.
- the required frequency selectivity ( ⁇ 500 Hz in some countries) is easy to implement.
- the evaluation is carried out by subsequent amplitude and time evaluation, as is known, for example, from the audio tone detectors of the Integral3 series from Bosch Telecom GmbH.
- Figure 2 shows timing diagrams during a
- FIG. 2A Period of 60 milliseconds.
- the oscillation frequency f G of an oscillation train of a charge pulse is present in this period.
- the modulation frequency f moc ⁇ (frequency f R of the square-wave signal R in Figure 3) changes in time intervals of 15 milliseconds between 14 kHz and 18 kHz.
- FIG. 3 corresponds - in so far as the reference symbols match - in principle to Figure 1.
- the difference frequency f A which leaves the modulator 5, is 2 kHz in the entire period shown in Figure 2A.
- FIG. 2B shows the same conditions for the presence of an interference frequency f s of 20 kHz on the a / b wires. This time the difference frequency f A changes between 6 kHz and 2 kHz. In the desired manner, this change does not lead to the detection of a charge pulse.
- a frequency counter F is provided, which provides the changing modulation frequencies fl and f2, respectively, by a switch S in time from 15 milliseconds can be switched through to modulator 5 alternately.
- an oscillation frequency f G 16 kHz
- fl 14 kHz
- f2 18 kHz.
- the frequency divider F can also be switched to conditions for an oscillation frequency f G of 12 kHz; the frequencies fl and f2, which alternately the
- Forming the modulation frequency is then, for example, 10 or 14 kHz.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Meter Arrangements (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Selective Calling Equipment (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CZ19982026A CZ288999B6 (cs) | 1995-12-30 | 1996-12-18 | Způsob a zařízení k modulaci tarifních impulzů v telefonním zařízení |
PL96327607A PL182355B1 (pl) | 1995-12-30 | 1996-12-18 | Sposób i uklad modulacji impulsów taryfowych w instalacji telefonicznej PL |
EP96946323A EP0870395A2 (de) | 1995-12-30 | 1996-12-18 | Verfahren und anordnung zum erkennen von gebührenimpulsen in einer telefonanlage |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19549201 | 1995-12-30 | ||
DE19549201.3 | 1995-12-30 | ||
DE19626226A DE19626226C2 (de) | 1995-12-30 | 1996-06-29 | Verfahren und Anordnung zum Erzeugen von Gebührenimpulsen in einer Telefonanlage |
DE19626226.7 | 1996-06-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997024852A2 true WO1997024852A2 (de) | 1997-07-10 |
WO1997024852A3 WO1997024852A3 (de) | 1997-08-21 |
Family
ID=26021801
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/002447 WO1997024852A2 (de) | 1995-12-30 | 1996-12-18 | Verfahren und anordnung zum erkennen von gebührenimpulsen in einer telefonanlage |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0870395A2 (de) |
CZ (1) | CZ288999B6 (de) |
HU (1) | HUP9901678A3 (de) |
PL (1) | PL182355B1 (de) |
WO (1) | WO1997024852A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1024649A2 (de) * | 1999-01-28 | 2000-08-02 | Alcatel | Lineare Mehrkanaldetektionssystem für Gebührensignalen durch spektrales Faltungsprodukt |
DE19953889A1 (de) * | 1999-11-09 | 2001-05-23 | Infineon Technologies Ag | Schaltungsanordnung zur Gebührenimpulserkennung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0279025A1 (de) * | 1987-01-12 | 1988-08-24 | Sodeco Sa | Empfänger für Taximpulse |
GB2201864A (en) * | 1987-02-11 | 1988-09-07 | Gen Electric Plc | Signal converter unit |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3030889B2 (ja) * | 1991-03-06 | 2000-04-10 | 日本電気株式会社 | 課金信号送出方式 |
-
1996
- 1996-12-18 EP EP96946323A patent/EP0870395A2/de not_active Withdrawn
- 1996-12-18 CZ CZ19982026A patent/CZ288999B6/cs not_active IP Right Cessation
- 1996-12-18 WO PCT/DE1996/002447 patent/WO1997024852A2/de not_active Application Discontinuation
- 1996-12-18 PL PL96327607A patent/PL182355B1/pl not_active IP Right Cessation
- 1996-12-18 HU HU9901678A patent/HUP9901678A3/hu unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0279025A1 (de) * | 1987-01-12 | 1988-08-24 | Sodeco Sa | Empfänger für Taximpulse |
GB2201864A (en) * | 1987-02-11 | 1988-09-07 | Gen Electric Plc | Signal converter unit |
Non-Patent Citations (2)
Title |
---|
ELECTRONIC CIRCUITS AND SYSTEMS FOR COMMUNICATION, ETH ZURICH, MAR. 5 - 8, 1990, Nr. -, 5.M{rz 1990, MELCHIOR H, Seiten 256-267, XP000315106 VOLLENWEIDER W: "CHIP-SIZE AND POWER CONSUMPTION OF ASICS AND DIGITAL SIGNAL PROCESSORS FOR LOW-POWER SIGNAL-PROCESSING" * |
PATENT ABSTRACTS OF JAPAN vol. 17, no. 81 (E-1321), 18.Februar 1993 & JP 04 277968 A (NEC CORP), 2.Oktober 1992, * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1024649A2 (de) * | 1999-01-28 | 2000-08-02 | Alcatel | Lineare Mehrkanaldetektionssystem für Gebührensignalen durch spektrales Faltungsprodukt |
EP1024649A3 (de) * | 1999-01-28 | 2004-12-15 | Alcatel | Lineare Mehrkanaldetektionssystem für Gebührensignalen durch spektrales Faltungsprodukt |
DE19953889A1 (de) * | 1999-11-09 | 2001-05-23 | Infineon Technologies Ag | Schaltungsanordnung zur Gebührenimpulserkennung |
DE19953889C2 (de) * | 1999-11-09 | 2002-02-07 | Infineon Technologies Ag | Schaltungsanordnung zur Gebührenimpulserkennung |
US6963737B2 (en) | 1999-11-09 | 2005-11-08 | Infineon Technologies Ag | Circuit configuration for metering pulse recognition |
Also Published As
Publication number | Publication date |
---|---|
WO1997024852A3 (de) | 1997-08-21 |
PL327607A1 (en) | 1998-12-21 |
HUP9901678A2 (hu) | 1999-08-30 |
EP0870395A2 (de) | 1998-10-14 |
HUP9901678A3 (en) | 2000-04-28 |
CZ288999B6 (cs) | 2001-10-17 |
CZ202698A3 (cs) | 1999-08-11 |
PL182355B1 (pl) | 2001-12-31 |
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