US3500213A - Sinewave synthesizer for telegraph systems - Google Patents

Sinewave synthesizer for telegraph systems Download PDF

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Publication number
US3500213A
US3500213A US643525A US3500213DA US3500213A US 3500213 A US3500213 A US 3500213A US 643525 A US643525 A US 643525A US 3500213D A US3500213D A US 3500213DA US 3500213 A US3500213 A US 3500213A
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Prior art keywords
frequency
counter
telegraphic
circuit
outlet
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US643525A
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Albert Ameau
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Alcatel CIT SA
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Alcatel CIT SA
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H04L27/122—Modulator circuits; Transmitter circuits using digital generation of carrier signals

Definitions

  • FIG.3 AMEAU SIKEWAVE SY'I'HESIZER FOR TELEGPAPH SYSTEMS 2 Sheets-Sheet 2 Filed June 5. 1967 VERTER oecoosn ANALOG 22 FIG.3
  • the present invention has as its object a Wave synthesizer, more specifically of Waves frequency modulated by telegraphic signals, in which means is incorporated for limiting the spectrum and reducing the telegraphic distortion, and which lends itself to a form of construction utilizing the principles of integrated circuits.
  • telegraphic transmission by means of frequency modulated waves is of interest as a means of providing satisfactory protection against noise and interference. If it is applied without precautions, however, it establishes a very wide spectrum which increases the risk of causing flutter or babble and of overloading of the filters on reception.
  • a spectrum of this kind comprises a first group of lines F plus or minus it a second group of lines 3P plus or minus n), a third group of lines 5P plus or minus 12], etc.
  • n being a variable integer.
  • raising the frequencies renders it easier and less costly to effect the filtering processes which may prove to be necessary or advantageous. It is thus established that modulation at relatively high frequency is of interest.
  • a frequency division of this nature may b performed by means of an electronic counter Whose terminal element changes in position in a cadence k times slower than that of the signals actuating the same, that is to say once for k pulses received or once for k periods or cycles of the controlling signal.
  • a frequency division method of this kind is not applicable in the case of a telegraphic transmission of relatively fast handling speed in comparison with the carrier frequency, because it loses the definition of the characteristic instant in the interval of the duration of a period or cycle. It has become apparent however in the preceding, that a loss of definition of this kind may result in prohibitive telegraphic distortion.
  • a frequency division of this nature be performed by a method which .retains the definition of the characteristic instant, such as yielded by the multiple frequency, that is to say that a submultiple frequency be engendered which comprises as many phase steps as there are periods or cycles of the multiple frequency in a period or cycle of the submultiple frequency, that is to say k phase steps for a multiplication-division by k.
  • This is accomplished according to the invention, by synthesizing a wave of frequency P which can assume two values F F by means of an arrangement comprising a frequency oscillator kF, k being an even multiple of n, a counter of the ascending and descending type having one input terminal and two control terminals, known per se, of capacity (rr1), a decoder having n outlets, a numerical analog converter adjusted to supply an output voltage proportional to in which A is a constant, in which i 0, 1, 11 -1, logical circuits connected to the decoder to place the said counter in ascending counting operation when it reaches the position and in descending counting operation when it reaches the position n1 and a final or output amplifier supplying an output voltage whose envelope is a sinusoidal wave having the frequency F.
  • FIGURE 1 is the block diagram of a first form of embodiment of a device according to the invention.
  • FIGURE 2 is a curve illustrating the form of the current obtained at the outlet of the device according to FIGURE 1, as well as the corresponding curves.
  • FIGURE 3 is the block diagram of a second form of embodiment.
  • FIGURE 4 is a curve illustrating the form of the current obtained at the outlet of the device according to FIGURE 3, as well as the corresponding curves.
  • an emitter 1 of telegraphic signals applies its output to a shaping filter 2 of the RC type, which in turn is connected to an oscillator 3 of the linear type, that is to say an oscillator whose frequency varies linearly as a function of the strength of a signal fed to the input, for example a relaxation oscillator or multivibrator, which provides waves which are approximately square, whose frequency is a linear function of a control voltage applied at an input terminal, as well known.
  • the circuit of FIGURE 1 also includes an or circuit 4, a bistable switching element 5, a binary counter 6 whose two control inlets 61 and 62 are connected to two outlets 51 and 52 of the said switching element 5, respectively.
  • the counter 6 counts in ascending order for one condition of the switching element, and the counter 6 counts in descending order for the other condition of the switching element.
  • the counters applicable in two counting directions are well known in the art.
  • the counter 6 comprises 4 switching elements for 16 counting steps 0 to 15 inclusive.
  • the said voltage is applied at the inlet of an amplifier 9, which provides an output voltage U at an output terminal S.
  • the constant A is at least equal to 1.
  • the outlet (0) and the outlet (15) of the decoder 7 are connected to the input of the switching element 5 by means of the or circuit 4.
  • the switching element 5 places the counter 6 in the ascending counting condition
  • the switching element switches over and places the counter 6 in the descending counting condition.
  • the curve a of FIGURE 2 illustrates a telegraphic signal which passes, at the time t from the working valency to the rest valency.
  • a higher frequency of emission F corresponds to the working valency
  • a lower rest frequency F F T1 corresponds to the rest valency.
  • the curve b of FIGURE 2 shows the advance pulses reaching the counter 6.
  • the frequency value changes at the time t but no phase incoherence occurs because it is the same oscillator whose frequency is adjusted from tone value to the other.
  • the frequency is adjusted with continuity, since it has been assumed that the oscillator in question is of linear type, to which is applied a signal etndowed with a rounded-off form by the action of the shaper 2.
  • the interval which separates the advancing pulses is variable progressively according to the rule established by the shaper 2. This method is illustrated in the curve 0, which shows the true form of the variation F F One has:
  • a current which is principle has the form given by the curve 0 of FIGURE 2, is obtained at the outlet S of the amplifier 9.
  • the band limitation produced in the amplifier 9 or in a subsequent element in the circuit provides a current which is not cut into segments, but is of sinusoidal waveform, as illustrated by dashes in the curve 0 of FIGURE 2.
  • any phase incoherence is eliminated in the device of FIGURE 1. Nevertheless, the stability of a multivibrator wherein frequency is adjustable according to voltage need not exceed a mean value of the order of 0.5% for example. A system of this nature is thus applicable to chanels of low degree, but would not be applicable to channels of high degree, for which it would result in an excessive drift or shift in absolute value.
  • a second embodiment of the invention includes an emitter 11 of telegraphic signals analogous to the emitter 1 of FIGURE 1.
  • a logical inverter 12 Connected to the emitter 11 is a logical inverter 12. the outlet of which is connected to one inlet of an and gate 16.
  • a stable oscillator 13 providing the frequency F and a stable oscillator oscillator 14'providing the frequency F are connected respectively to an and gate 15 connected also to an outlet 0 fthe emitter 11 and to the other and gate 16 connected also by an inlet to the inverter 12.
  • An or circuit 17 receives currents issuing from the two and gates 15 and 16.
  • a counter 20, of the binary type arranged for counting in ascending and descending order and comprising three switching elements has an inlet connected to the outlet of the or circuit 17 and two control terminals connected, respectively, to two outlets of a binary switching element 19,
  • a differential amplifier 26 comprising outlets S and S has an inlet connected to the outlet of an and circuit 24 and another inlet connected to the outlet of an and circuit 24 and another inlet connected to the outlet of an and circuit 25. These two and circuits each have an input connected in combination to the outlet of the said converter 22.
  • the and" circuit 24 has an inlet connected to an outlet of a bistable switching element 23 and the and circuit 25 has an inlet connected to the other outlet of the said switching element 23.
  • This switching element 23 has an input terminal connected to an outlet of the switching element 19.
  • the differential amplifier 26 has two output terminals S and S symmetrical to the terminals of a resistance 27.
  • the outlet and the outlet (7) of the decoder 21 are connected to the inlet of the switching element 19 by means of an or circuit 18.
  • the constant A is equal to zero in this case.
  • the curve a of FIGURE 4 shows a telegraphic transition at the time t Prior to the time t the circuit 16 is unblocked, the circuit is blocked, and the frequency F (curve b) supplied by the oscillator 14 is allowed to reach the counter 20. After the time t, the circuit 16 is blocked, the circuit 15 is unblocked, and the frequency F (curve c) is allowed to reach the counter 20. The advancing pulses received by the counter are shown in the curve d. For 7 pulses received by the counter 20 starting from zero, it passes successively to the states 1 7.
  • a fragmented sinusoidal curve is thus obtained, being a smoothed sinusoidal curve (dashed line curve of graph 2), by the action of the band limitations in the circuits, without a continuous or direct component.
  • the frequency division factor amounts to 28, with a counter comprising only three switching elements and one seven-value converter instead of a fifteen-value converter in the case of FIGURE 1.
  • the linearly frequency modulated low frequency wave has a limited spectrum, which renders it possible to omit the conventional band filter.
  • a wave synthesizer for use especially with telegraphy systems, for generating a wave having a frequency F which may assume two values F and F comprising:
  • signal generator means providing a signal of frequency lcF, k being an even multiple of a selected value n,
  • counter means capable of counting in ascending and descending order having an input connected to said signal generator means and having a capacity of a decoder connected to said counter means and having it outputs,
  • a numerical analog converter having it inputs connected to said decoder and supplying an output voltage proportional to SlIl tn A+ n1 in which A is a constant and i is a number between 0 and n1,
  • amplifier means connected to the output of said converter providing an output voltage whose envelope is a sinusoidal wave of frequency F.
  • a wave synthesizer as defined in claim 1 wherein k 2n and said logical circuit means includes an or circuit having inputs connected to the 0 and n1 outputs of said decoder and a binary switching element connected to said or circuit and having a pair of outputs connected to respective control inputs of said counter for controlling the direction of count thereof.
  • a wave synthesizer as defined in claim 1 wherein k 4n and said logical circuit means includes a first or circuit having inputs connected to the 0 and n--1 outputs of said decoder, a first binary switching element connected to said or circuit and having a pair of outputs connected to respective control inputs of said counter for controlling the direction of count thereof, a pair of and gates connecting the output of said converter to said amplifier means and a second binary switching element connected to an output of said first binary element and having a pair of control outputs connected to respective and gates for actuating one and gate at a time.
  • control means includes a second pair of and gates each having one of said first and second oscillators connected thereto and a telegraphic signal emitter connected References Cited UNITED STATES PATENTS 1/1951 Seid et a1. 32827 8/1955 Barney 32814 3 5/1961 Williamson et al 32827 4/1967 Simone 32814 X JOHN S. HEYMAN, Primary Examiner us. 01. X.R.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
US643525A 1966-06-03 1967-06-05 Sinewave synthesizer for telegraph systems Expired - Lifetime US3500213A (en)

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Application Number Priority Date Filing Date Title
FR64071A FR1496141A (fr) 1966-06-03 1966-06-03 Générateur d'ondes modulées en fréquence

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BE (1) BE699098A (nl)
DE (1) DE1512172C3 (nl)
FR (1) FR1496141A (nl)
GB (1) GB1180418A (nl)
LU (1) LU53776A1 (nl)
NL (1) NL156289B (nl)

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568069A (en) * 1968-12-16 1971-03-02 Sanders Associates Inc Digitally controlled frequency synthesizer
US3577084A (en) * 1969-11-03 1971-05-04 Singer General Precision Computer sound generator
US3626076A (en) * 1969-05-21 1971-12-07 Nippon Musical Instruments Mfg Mixer circuit for electronic musical instrument providing staircase tone signal
DE2134933A1 (de) * 1970-07-17 1972-01-27 Cit Alcatel Digitaler Frequenzgenerator
US3641566A (en) * 1969-09-29 1972-02-08 Gen Electric Frequency polyphase power supply
US3654450A (en) * 1970-04-03 1972-04-04 Joseph A Webb Digital signal generator synthesizer
US3657657A (en) * 1970-08-03 1972-04-18 William T Jefferson Digital sine wave generator
US3659087A (en) * 1970-09-30 1972-04-25 Ibm Controllable digital pulse generator and a test system incorporating the pulse generator
US3735269A (en) * 1971-10-29 1973-05-22 Rockland Systems Corp Digital frequency synthesizer
US3746891A (en) * 1971-12-27 1973-07-17 Singer Co Digitally controlled sine wave generator
US3752973A (en) * 1971-06-30 1973-08-14 Leybold Heraeus Verwaltung Apparatus for producing voltage functions
US3778814A (en) * 1972-08-07 1973-12-11 Us Navy Waveform synthesizer
US3829783A (en) * 1972-03-04 1974-08-13 Zuuren E Van Generator for generating a number of selected frequencies
US3832639A (en) * 1972-06-10 1974-08-27 Philips Corp Tone generator for generating selected frequencies
US3849774A (en) * 1972-09-14 1974-11-19 Astrosyst Inc Analog-to-digital converter employing an electromagnetic resolver
US3896365A (en) * 1974-08-05 1975-07-22 Gen Motors Corp Power center inverter having power center commutation during operation into short circuits
US3898568A (en) * 1972-09-14 1975-08-05 Astrosyst Inc Signal synthesizer employing an autotransformer having a tapped coil
US3925654A (en) * 1974-05-13 1975-12-09 United Technologies Corp Digital sine wave synthesizer
US3938051A (en) * 1974-10-01 1976-02-10 The Singer Company Digital electrocardiogram waveform generator
US3939715A (en) * 1974-06-24 1976-02-24 Spectral Dynamics Corporation Of San Diego Method and apparatus for developing balance information for rotating equipments and assemblies
JPS547168B1 (nl) * 1971-05-28 1979-04-04
JPS5558651A (en) * 1975-09-29 1980-05-01 Mostek Corp Multiple frequency signal generator
US4204261A (en) * 1978-03-01 1980-05-20 The Valeron Corporation Complex analog signal generator
US4205386A (en) * 1978-03-01 1980-05-27 The Valeron Corporation Electrocardiographic and blood pressure waveform simulator device
US4236090A (en) * 1978-08-08 1980-11-25 International Standard Electric Corporation Signal generator and signal converter using same
US4295098A (en) * 1979-12-19 1981-10-13 Rca Corporation Digitally adjustable phase shifting circuit
US4301415A (en) * 1980-01-28 1981-11-17 Norlin Industries, Inc. Programmable multiple phase AC power supply
US4347403A (en) * 1980-04-24 1982-08-31 The United States Of America As Represented By The Secretary Of The Navy Electrical waveform synthesizer
WO1983000588A1 (en) * 1981-08-03 1983-02-17 Motorola Inc Multi-tone signal generator
US4524326A (en) * 1982-07-22 1985-06-18 Amca International Corp. Digitally-driven sine/cosine generator and modulator
US4620291A (en) * 1984-02-06 1986-10-28 Mcdonnell Douglas Corporation Digital-to-analog converter interpolator
US5180987A (en) * 1991-12-19 1993-01-19 Nec America Inc. DC-to-AC symmetrical sine wave generator
US5426387A (en) * 1992-02-27 1995-06-20 Societeanonyme Dite: Labratoires D'hygiene Et De Dietetique Device for generating an electrical voltage of predetermined waveform, iontophoresis apparatus for transdermally administering medicinal products and electrical stimulation apparatus, which apparatuses are equipped with such a device
US5442698A (en) * 1991-06-21 1995-08-15 Adc Telecommunications, Inc. Ringing generator for telephones
US20090184736A1 (en) * 2007-07-31 2009-07-23 Zarlink Semiconductor Inc. Flexible waveform generator with extended range capability
US11287437B2 (en) * 2019-07-30 2022-03-29 Hyundai Mobis Co., Ltd. Method and apparatus for implementing drive signal for driving resolver sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941942A (en) * 1974-01-02 1976-03-02 Motorola, Inc. Two of eight tone encoder

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2537427A (en) * 1949-09-19 1951-01-09 North American Aviation Inc Digital servo
US2715678A (en) * 1950-05-26 1955-08-16 Barney Kay Howard Binary quantizer
US2983872A (en) * 1956-11-27 1961-05-09 Ferranti Ltd Signal-translating apparatus
US3314015A (en) * 1963-09-16 1967-04-11 Bell Telephone Labor Inc Digitally synthesized artificial transfer networks

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US3205440A (en) * 1962-04-10 1965-09-07 Int Standard Electric Corp Control arrangement for transmission of frequency shift modulated signals
US3178643A (en) * 1960-11-21 1965-04-13 Bell Telephone Labor Inc Pulse transmission echo suppression system
US3223925A (en) * 1962-01-29 1965-12-14 Ibm Digital data modulation device
DE1217435B (de) * 1962-02-12 1966-05-26 Siemens Ag Verfahren und Schaltungsanordnung zur digitalen Frequenzmodulation
BE638037A (nl) * 1962-10-01

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537427A (en) * 1949-09-19 1951-01-09 North American Aviation Inc Digital servo
US2715678A (en) * 1950-05-26 1955-08-16 Barney Kay Howard Binary quantizer
US2983872A (en) * 1956-11-27 1961-05-09 Ferranti Ltd Signal-translating apparatus
US3314015A (en) * 1963-09-16 1967-04-11 Bell Telephone Labor Inc Digitally synthesized artificial transfer networks

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568069A (en) * 1968-12-16 1971-03-02 Sanders Associates Inc Digitally controlled frequency synthesizer
US3626076A (en) * 1969-05-21 1971-12-07 Nippon Musical Instruments Mfg Mixer circuit for electronic musical instrument providing staircase tone signal
US3641566A (en) * 1969-09-29 1972-02-08 Gen Electric Frequency polyphase power supply
US3577084A (en) * 1969-11-03 1971-05-04 Singer General Precision Computer sound generator
US3654450A (en) * 1970-04-03 1972-04-04 Joseph A Webb Digital signal generator synthesizer
DE2134933A1 (de) * 1970-07-17 1972-01-27 Cit Alcatel Digitaler Frequenzgenerator
US3657657A (en) * 1970-08-03 1972-04-18 William T Jefferson Digital sine wave generator
US3659087A (en) * 1970-09-30 1972-04-25 Ibm Controllable digital pulse generator and a test system incorporating the pulse generator
JPS547168B1 (nl) * 1971-05-28 1979-04-04
US3752973A (en) * 1971-06-30 1973-08-14 Leybold Heraeus Verwaltung Apparatus for producing voltage functions
US3735269A (en) * 1971-10-29 1973-05-22 Rockland Systems Corp Digital frequency synthesizer
US3746891A (en) * 1971-12-27 1973-07-17 Singer Co Digitally controlled sine wave generator
US3829783A (en) * 1972-03-04 1974-08-13 Zuuren E Van Generator for generating a number of selected frequencies
DE2328992B2 (de) * 1972-06-10 1977-04-14 Philips Nv Tongenerator zum erzeugen ausgewaehlter frequenzen
US3832639A (en) * 1972-06-10 1974-08-27 Philips Corp Tone generator for generating selected frequencies
DE2328992C3 (de) * 1972-06-10 1977-11-24 Philips Nv Tongenerator zum erzeugen ausgewaehlter frequenzen
US3778814A (en) * 1972-08-07 1973-12-11 Us Navy Waveform synthesizer
US3849774A (en) * 1972-09-14 1974-11-19 Astrosyst Inc Analog-to-digital converter employing an electromagnetic resolver
US3898568A (en) * 1972-09-14 1975-08-05 Astrosyst Inc Signal synthesizer employing an autotransformer having a tapped coil
US3925654A (en) * 1974-05-13 1975-12-09 United Technologies Corp Digital sine wave synthesizer
US3939715A (en) * 1974-06-24 1976-02-24 Spectral Dynamics Corporation Of San Diego Method and apparatus for developing balance information for rotating equipments and assemblies
US3896365A (en) * 1974-08-05 1975-07-22 Gen Motors Corp Power center inverter having power center commutation during operation into short circuits
US3938051A (en) * 1974-10-01 1976-02-10 The Singer Company Digital electrocardiogram waveform generator
JPS5934204Y2 (ja) * 1975-09-25 1984-09-21 モステク・コ−ポレ−シヨン 信号発生器
JPS5558651A (en) * 1975-09-29 1980-05-01 Mostek Corp Multiple frequency signal generator
JPS56114151U (nl) * 1975-09-29 1981-09-02
US4205386A (en) * 1978-03-01 1980-05-27 The Valeron Corporation Electrocardiographic and blood pressure waveform simulator device
US4204261A (en) * 1978-03-01 1980-05-20 The Valeron Corporation Complex analog signal generator
US4236090A (en) * 1978-08-08 1980-11-25 International Standard Electric Corporation Signal generator and signal converter using same
US4295098A (en) * 1979-12-19 1981-10-13 Rca Corporation Digitally adjustable phase shifting circuit
US4301415A (en) * 1980-01-28 1981-11-17 Norlin Industries, Inc. Programmable multiple phase AC power supply
US4347403A (en) * 1980-04-24 1982-08-31 The United States Of America As Represented By The Secretary Of The Navy Electrical waveform synthesizer
WO1983000588A1 (en) * 1981-08-03 1983-02-17 Motorola Inc Multi-tone signal generator
US4524326A (en) * 1982-07-22 1985-06-18 Amca International Corp. Digitally-driven sine/cosine generator and modulator
US4620291A (en) * 1984-02-06 1986-10-28 Mcdonnell Douglas Corporation Digital-to-analog converter interpolator
US5442698A (en) * 1991-06-21 1995-08-15 Adc Telecommunications, Inc. Ringing generator for telephones
US5180987A (en) * 1991-12-19 1993-01-19 Nec America Inc. DC-to-AC symmetrical sine wave generator
US5426387A (en) * 1992-02-27 1995-06-20 Societeanonyme Dite: Labratoires D'hygiene Et De Dietetique Device for generating an electrical voltage of predetermined waveform, iontophoresis apparatus for transdermally administering medicinal products and electrical stimulation apparatus, which apparatuses are equipped with such a device
US20090184736A1 (en) * 2007-07-31 2009-07-23 Zarlink Semiconductor Inc. Flexible waveform generator with extended range capability
US7728634B2 (en) * 2007-07-31 2010-06-01 Zarlink Semiconductor Inc. Flexible waveform generator with extended range capability
US11287437B2 (en) * 2019-07-30 2022-03-29 Hyundai Mobis Co., Ltd. Method and apparatus for implementing drive signal for driving resolver sensor

Also Published As

Publication number Publication date
DE1512172C3 (de) 1982-11-04
NL156289B (nl) 1978-03-15
FR1496141A (fr) 1967-09-29
LU53776A1 (nl) 1969-03-20
DE1512172B2 (de) 1976-06-16
NL6707693A (nl) 1967-12-04
BE699098A (nl) 1967-11-27
DE1512172A1 (de) 1969-07-17
GB1180418A (en) 1970-02-04

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