JPS5522984B2 - - Google Patents
Info
- Publication number
- JPS5522984B2 JPS5522984B2 JP9985275A JP9985275A JPS5522984B2 JP S5522984 B2 JPS5522984 B2 JP S5522984B2 JP 9985275 A JP9985275 A JP 9985275A JP 9985275 A JP9985275 A JP 9985275A JP S5522984 B2 JPS5522984 B2 JP S5522984B2
- Authority
- JP
- Japan
- 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
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)
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 (2)
| Publication Number | Publication Date |
|---|---|
| JPS5176955A JPS5176955A (en:Method) | 1976-07-03 |
| JPS5522984B2 true JPS5522984B2 (en:Method) | 1980-06-20 |
Family
ID=24017201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9985275A Expired JPS5522984B2 (en:Method) | 1974-09-18 | 1975-08-19 |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3991389A (en:Method) |
| JP (1) | JPS5522984B2 (en:Method) |
| CA (1) | CA1058758A (en:Method) |
| CH (1) | CH586974A5 (en:Method) |
| ES (1) | ES440226A1 (en:Method) |
| FR (1) | FR2285752A1 (en:Method) |
| GB (1) | GB1477113A (en:Method) |
| IT (1) | IT1041941B (en:Method) |
Families Citing this family (21)
| 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 |
| US4132950A (en) * | 1977-04-27 | 1979-01-02 | Texas Instruments Incorporated | 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 |
| US4330687A (en) | 1979-03-14 | 1982-05-18 | Teltone Corporation | Audio and full duplex digital data carrier 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)
| 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 (en:Method) * | 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 |
-
1974
- 1974-09-18 US US05/507,087 patent/US3991389A/en not_active Expired - Lifetime
-
1975
- 1975-06-10 GB GB2477075A patent/GB1477113A/en not_active Expired
- 1975-08-07 FR FR7525144A patent/FR2285752A1/fr active Granted
- 1975-08-13 ES ES440226A patent/ES440226A1/es not_active Expired
- 1975-08-19 JP JP9985275A patent/JPS5522984B2/ja not_active Expired
- 1975-08-19 CA CA233,997A patent/CA1058758A/en not_active Expired
- 1975-08-27 IT IT26599/75A patent/IT1041941B/it active
- 1975-09-18 CH CH1212175A patent/CH586974A5/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2285752B1 (en:Method) | 1977-12-16 |
| USB507087I5 (en:Method) | 1976-02-17 |
| CA1058758A (en) | 1979-07-17 |
| DE2536507B2 (de) | 1977-02-10 |
| JPS5176955A (en:Method) | 1976-07-03 |
| GB1477113A (en) | 1977-06-22 |
| FR2285752A1 (fr) | 1976-04-16 |
| IT1041941B (it) | 1980-01-10 |
| DE2536507A1 (de) | 1976-04-01 |
| US3991389A (en) | 1976-11-09 |
| ES440226A1 (es) | 1977-03-16 |
| CH586974A5 (en:Method) | 1977-04-15 |