SG8391G - Privacy signal transmission system - Google Patents
Privacy signal transmission systemInfo
- Publication number
- SG8391G SG8391G SG83/91A SG8391A SG8391G SG 8391 G SG8391 G SG 8391G SG 83/91 A SG83/91 A SG 83/91A SG 8391 A SG8391 A SG 8391A SG 8391 G SG8391 G SG 8391G
- Authority
- SG
- Singapore
- Prior art keywords
- signal transmission
- transmission system
- privacy signal
- privacy
- transmission
- Prior art date
Links
- 230000008054 signal transmission Effects 0.000 title 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
- H04B14/046—Systems or methods for reducing noise or bandwidth
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Transmitters (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57223892A JPS59115640A (ja) | 1982-12-22 | 1982-12-22 | 秘話信号伝送方式 |
Publications (1)
Publication Number | Publication Date |
---|---|
SG8391G true SG8391G (en) | 1991-04-05 |
Family
ID=16805338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SG83/91A SG8391G (en) | 1982-12-22 | 1991-02-18 | Privacy signal transmission system |
Country Status (9)
Country | Link |
---|---|
US (1) | US4841571A (ja) |
EP (1) | EP0111937B1 (ja) |
JP (1) | JPS59115640A (ja) |
KR (1) | KR860002153B1 (ja) |
AU (1) | AU582532B2 (ja) |
CA (1) | CA1204188A (ja) |
DE (1) | DE3379627D1 (ja) |
HK (1) | HK26891A (ja) |
SG (1) | SG8391G (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6693951B1 (en) | 1990-06-25 | 2004-02-17 | Qualcomm Incorporated | System and method for generating signal waveforms in a CDMA cellular telephone system |
US5103459B1 (en) * | 1990-06-25 | 1999-07-06 | Qualcomm Inc | System and method for generating signal waveforms in a cdma cellular telephone system |
US5214787A (en) * | 1990-08-31 | 1993-05-25 | Karkota Jr Frank P | Multiple audio channel broadcast system |
US5347542A (en) * | 1991-06-28 | 1994-09-13 | Motorola, Inc. | Demodulation selection for a communication signal |
US5255269A (en) * | 1992-03-30 | 1993-10-19 | Spacecom Systems, Inc. | Transmission of data by frequency modulation using gray code |
DE19530393A1 (de) * | 1995-08-18 | 1997-02-20 | Antonius Dr Rer Nat Klingler | Verfahren zur vocoderlosen Ver- und Entschlüsselung von analogen und digitalen Kommunikationssignalen auf der Basis deterministisch erzeugten Rauschens |
US5926500A (en) | 1996-05-28 | 1999-07-20 | Qualcomm Incorporated | Reduced peak-to-average transmit power high data rate CDMA wireless communication system |
US6678311B2 (en) | 1996-05-28 | 2004-01-13 | Qualcomm Incorporated | High data CDMA wireless communication system using variable sized channel codes |
WO1998052318A1 (en) * | 1997-03-14 | 1998-11-19 | Mobile Broadcasting Corporation | System and method of data transmission in the am frequency spectrum |
JPH11295439A (ja) * | 1998-04-07 | 1999-10-29 | Ishida Co Ltd | 異物検出機および異物検出システム |
JP2008177632A (ja) * | 2007-01-16 | 2008-07-31 | Oki Electric Ind Co Ltd | 無線音声通信回路 |
US9520920B2 (en) * | 2014-10-27 | 2016-12-13 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Transmitting and receiving digital and analog signals across an isolator using amplitude modulation |
US20230370758A1 (en) * | 2020-03-30 | 2023-11-16 | BlackBox Biometrics, Inc. | Acoustic monitoring systems and methods |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2283575A (en) * | 1938-04-19 | 1942-05-19 | Rca Corp | High frequency transmission system |
US2399469A (en) * | 1940-07-31 | 1946-04-30 | Gen Electric | Secret signaling system |
US2527561A (en) * | 1947-04-30 | 1950-10-31 | Farnsworth Res Corp | Selective calling system |
US3048781A (en) * | 1957-12-26 | 1962-08-07 | Bell Telephone Labor Inc | Reduction of quantizing error in quantized transmission systems |
US3173092A (en) * | 1961-11-15 | 1965-03-09 | Automatic Elect Lab | Delta modulation system |
US3273141A (en) * | 1963-03-19 | 1966-09-13 | Ball Brothers Res Corp | High speed analog-to-digital converter |
GB1095457A (ja) * | 1965-09-21 | |||
NL151593B (nl) * | 1966-11-22 | 1976-11-15 | Philips Nv | Stelsel voor signaaloverdracht met behulp van pulsdeltamodulatie. |
US3571758A (en) * | 1967-05-12 | 1971-03-23 | Westinghouse Electric Corp | Method and apparatus for adaptive delta modulation |
JPS5114846B1 (ja) * | 1968-08-08 | 1976-05-12 | ||
US4008435A (en) * | 1972-05-30 | 1977-02-15 | Nippon Electric Company, Ltd. | Delta modulation encoder |
US3784743A (en) * | 1972-08-23 | 1974-01-08 | Bell Telephone Labor Inc | Parallel data scrambler |
FR2209260B1 (ja) * | 1972-10-10 | 1975-03-28 | Radio Diffusion Tv Francaise | |
NL165014C (nl) * | 1973-09-03 | 1981-02-16 | Philips Nv | Transmissiestelsel met een zender en een ontvanger voor het met behulp van een pulscode overdragen van informatiesignalen. |
DE2355676C3 (de) * | 1973-11-07 | 1979-01-18 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Schaltungsanordnung zur Übertragung von Signalen mit Differenz-Pulscodemodulation (DPCM) |
NL174611C (nl) * | 1975-06-12 | 1984-07-02 | Philips Nv | Differentieel pulscodemodulatie overdrachtstelsel. |
GB1558452A (en) * | 1976-12-20 | 1980-01-03 | Japan Broadcasting Corp | Analogue to digital converting device |
JPS6016777B2 (ja) * | 1976-12-25 | 1985-04-27 | 株式会社東芝 | 信号伝送方式 |
JPS547205A (en) * | 1977-06-20 | 1979-01-19 | Nippon Telegr & Teleph Corp <Ntt> | Privacy circuit |
JPS5511638A (en) * | 1978-07-11 | 1980-01-26 | Nec Corp | Privacy circuit |
US4295223A (en) * | 1979-04-25 | 1981-10-13 | Westinghouse Electric Corp. | Digital signal/noise ratio amplifier apparatus for a communication system |
FR2481026B1 (ja) * | 1980-04-21 | 1984-06-15 | France Etat | |
JPS58198934A (ja) * | 1982-05-17 | 1983-11-19 | Sony Corp | 秘話装置 |
JPS5922208A (ja) * | 1982-07-06 | 1984-02-04 | Victor Co Of Japan Ltd | デイジタル情報信号記録方式 |
-
1982
- 1982-12-22 JP JP57223892A patent/JPS59115640A/ja active Granted
-
1983
- 1983-12-19 US US06/562,567 patent/US4841571A/en not_active Expired - Fee Related
- 1983-12-20 AU AU22554/83A patent/AU582532B2/en not_active Ceased
- 1983-12-21 CA CA000443977A patent/CA1204188A/en not_active Expired
- 1983-12-21 DE DE8383112913T patent/DE3379627D1/de not_active Expired
- 1983-12-21 EP EP83112913A patent/EP0111937B1/en not_active Expired
- 1983-12-22 KR KR1019830006112A patent/KR860002153B1/ko not_active IP Right Cessation
-
1991
- 1991-02-18 SG SG83/91A patent/SG8391G/en unknown
- 1991-04-11 HK HK268/91A patent/HK26891A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0111937A3 (en) | 1987-01-21 |
JPH0245856B2 (ja) | 1990-10-12 |
KR840007335A (ko) | 1984-12-06 |
HK26891A (en) | 1991-04-19 |
JPS59115640A (ja) | 1984-07-04 |
DE3379627D1 (en) | 1989-05-18 |
AU2255483A (en) | 1984-06-28 |
EP0111937B1 (en) | 1989-04-12 |
AU582532B2 (en) | 1989-04-06 |
EP0111937A2 (en) | 1984-06-27 |
CA1204188A (en) | 1986-05-06 |
KR860002153B1 (ko) | 1986-12-11 |
US4841571A (en) | 1989-06-20 |
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