ES440226A1 - Un dispositivo modulador de clave de desplazamiento de fre- cuencia. - Google Patents

Un dispositivo modulador de clave de desplazamiento de fre- cuencia.

Info

Publication number
ES440226A1
ES440226A1 ES440226A ES440226A ES440226A1 ES 440226 A1 ES440226 A1 ES 440226A1 ES 440226 A ES440226 A ES 440226A ES 440226 A ES440226 A ES 440226A ES 440226 A1 ES440226 A1 ES 440226A1
Authority
ES
Spain
Prior art keywords
output
mark
space
shift key
frequency shift
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
Application number
ES440226A
Other languages
English (en)
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of ES440226A1 publication Critical patent/ES440226A1/es
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Selective Calling Equipment (AREA)
ES440226A 1974-09-18 1975-08-13 Un dispositivo modulador de clave de desplazamiento de fre- cuencia. Expired ES440226A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/507,087 US3991389A (en) 1974-09-18 1974-09-18 Digital frequency shift key modulator

Publications (1)

Publication Number Publication Date
ES440226A1 true ES440226A1 (es) 1977-03-16

Family

ID=24017201

Family Applications (1)

Application Number Title Priority Date Filing Date
ES440226A Expired ES440226A1 (es) 1974-09-18 1975-08-13 Un dispositivo modulador de clave de desplazamiento de fre- cuencia.

Country Status (8)

Country Link
US (1) US3991389A (es)
JP (1) JPS5522984B2 (es)
CA (1) CA1058758A (es)
CH (1) CH586974A5 (es)
ES (1) ES440226A1 (es)
FR (1) FR2285752A1 (es)
GB (1) GB1477113A (es)
IT (1) IT1041941B (es)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083008A (en) * 1975-04-10 1978-04-04 Blaupunkt-Werke Gmbh Method and circuit for generation of digitally frequency-shiftable electric signals
US4090135A (en) * 1976-06-29 1978-05-16 The United States Of America As Represented By The Secretary Of The Interior Wireless FSK technique for telemetering underground data to the surface
US4161697A (en) * 1977-04-27 1979-07-17 Texas Instruments Incorporated Automatically clarifying radio receiver
US4142245A (en) * 1977-08-22 1979-02-27 Texas Instruments Incorporated Multi-frequency digital wave synthesizer for providing analog output signals
US4130840A (en) * 1977-10-21 1978-12-19 Exxon Research & Engineering Co. Method and apparatus for coupling facsimile signals to a telephone network
JPS5537002A (en) * 1978-08-24 1980-03-14 Fujitsu Ltd Fs modulation system
US4302629A (en) * 1979-03-14 1981-11-24 Teltone Corporation Digital data transmission system
US4417349A (en) * 1979-11-08 1983-11-22 Digital Broadcasting Corporation SCA Data transmission system with a raised cosine filter
JPS58172250U (ja) * 1982-05-11 1983-11-17 日立電子株式会社 Ｍｓｋ変調回路
JPS5952296A (ja) * 1982-09-20 1984-03-26 カシオ計算機株式会社 エンベロープ制御装置
US4475244A (en) * 1983-02-10 1984-10-02 John A. Neal Time-period modulation transmission system
US4577333A (en) * 1984-09-13 1986-03-18 Gridcomm Inc. Composite shift keying communication system
US4914396A (en) * 1987-09-21 1990-04-03 Acme Electric Corporation PWM waveform generator
US4878035A (en) * 1988-05-27 1989-10-31 Wavetek Rf Products, Inc. Hybrid frequency shift keying modulator and method
US5808285A (en) * 1990-09-17 1998-09-15 Metrologic Instruments, Inc. Portable code symbol reading device with one-way wireless data packet transmission link to base unit employing condition-dependent acoustical signalling for data packet reception acknowledgement
US7077327B1 (en) * 1990-09-17 2006-07-18 Metrologic Instruments, Inc. System for reading bar code symbols using bar code readers having RF signal transmission links with base stations
US6761317B1 (en) 1991-09-17 2004-07-13 Metrologic Instruments, Inc. Reading bar code symbols using readers having one-way RF signal transmission links with base stations
US6460769B1 (en) 1991-09-17 2002-10-08 Metrologic Instruments, Inc. System for reading bar code symbols using portable bar code symbol readers having one-way RF signal transmission links with base stations
US6078226A (en) * 1998-02-02 2000-06-20 Tritech Microelectronics, Ltd. Integrated circuit implementation of a frequency shift keying oscillator
US7881409B2 (en) * 2004-01-22 2011-02-01 The Regents Of The University Of Michigan Demodulator, chip and method for digitally demodulating an FSK signal

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102238A (en) * 1961-11-13 1963-08-27 Collins Radio Co Encoder with one frequency indicating one binary logic state and another frequency indicating other state
FR2064258A6 (es) * 1969-09-22 1971-07-23 Lignes Telegraph Telephon
US3668562A (en) * 1970-04-15 1972-06-06 Tel Tech Corp Frequency modulation system for transmitting binary information
US3659048A (en) * 1970-04-30 1972-04-25 Westinghouse Electric Corp Digital frequency change control system
US3713017A (en) * 1971-10-13 1973-01-23 Collins Radio Co Frequency shift keyed apparatus
US3773975A (en) * 1971-12-17 1973-11-20 Burroughs Corp Fsk digital transmitter
US3787785A (en) * 1972-05-15 1974-01-22 Collins Radio Co Phase representative digital signal modulating apparatus

Also Published As

Publication number Publication date
USB507087I5 (es) 1976-02-17
CH586974A5 (es) 1977-04-15
GB1477113A (en) 1977-06-22
DE2536507A1 (de) 1976-04-01
FR2285752B1 (es) 1977-12-16
DE2536507B2 (de) 1977-02-10
CA1058758A (en) 1979-07-17
FR2285752A1 (fr) 1976-04-16
JPS5176955A (es) 1976-07-03
IT1041941B (it) 1980-01-10
JPS5522984B2 (es) 1980-06-20
US3991389A (en) 1976-11-09

Similar Documents

Publication Publication Date Title
ES440226A1 (es) Un dispositivo modulador de clave de desplazamiento de fre- cuencia.
ES421933A1 (es) Un transmisor de bucle sincronizado en fase.
GB1525597A (en) Digital electronic musical instrument
GB1270802A (en) Remote control of vending machines
EP0082473A3 (en) Frequency modulation transmitter
GB1138134A (en) Apparatus for producing output signals at frequency intervals for tuning musical instruments
ES482039A1 (es) Mejoras en disposiciones generadoras de frecuencias multipleseleccionables de transmisor y receptor de radio.
CA1129100A (en) Microprocessor tone synthesizer with reduced quantization error
GB1438126A (en) Oscillator unit and method of digital adjustment of output frequency thereof
GB1393124A (en) Frequency synthesiser
GB1374539A (en) Tone-source device
JPS5841372A (ja) Ｆｍ／ｃｗ型無線高度計におけるステツプ誤差除去装置
JPS54112152A (en) Frequency divider
GB1216080A (en) Improvements in or relating to reiteration, percussion and speaking tone effects in electronic music generation
JPS5725755A (en) Waveform superposed fsk modulator
ES431449A1 (es) Dispositivo generador para producir tonos de una escala mu-sical en instrumentos musicales electronicos.
ES395238A1 (es) Una disposicion para producir una senal de vibrato.
GB1502432A (en) Frequency synthesisers
JPS54107777A (en) Electronic master and subordinate watch
GB1515183A (en) Electronic musical instruments
FR2406863A1 (fr) Procedes et dispositifs pour synthetiser des sons
JPS5333038A (en) Phase synchronizing oscillator
SU970721A1 (ru) Устройство формировани сигналов амплитудной манипул ции
JPS5635559A (en) Phase modulating device
GB1217358A (en) Very-low and low-frequency precision phase calibrator