ES2125494T3 - Metodo y sistema para criptografiar y descriptografiar señales de audio. - Google Patents
Metodo y sistema para criptografiar y descriptografiar señales de audio.Info
- Publication number
- ES2125494T3 ES2125494T3 ES94931915T ES94931915T ES2125494T3 ES 2125494 T3 ES2125494 T3 ES 2125494T3 ES 94931915 T ES94931915 T ES 94931915T ES 94931915 T ES94931915 T ES 94931915T ES 2125494 T3 ES2125494 T3 ES 2125494T3
- Authority
- ES
- Spain
- Prior art keywords
- signal
- carrier
- modulators
- scrambled
- audio
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplitude Modulation (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Reverberation, Karaoke And Other Acoustics (AREA)
- Stereo-Broadcasting Methods (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Transmitters (AREA)
Abstract
LAS SEÑALES AUDIO SON DECODIFICADAS MEDIANTE MODULACION DE DOBLE BANDA LATERAL DE LA SEÑAL DE AUDIO CODIFICADA CON UNA PORTADORA DE MODULACION QUE TIENE UNA FRECUENCIA DE ACARREO LIGERAMENTE SUPERIOR A LA SEÑAL DE AUDIO MAS ALTA PRESENTE EN EL LA SEÑAL DE AUDIO CODIFICADA. ESTO PRODUCE UNA SEÑAL DE DOBLE BANDA LATERAL QUE SE HACE PASAR A TRAVES DE UN FILTRO PASABAJOS QUE A SU VEZ ES MODULADA POR UNA SEGUNDA FRECUENCIA PORTADORA MENOR QUE LA PRIMERA SEÑAL PORTADORA EN LA MISMA MEDIDA QUE LA DESVIACION DEL ESPECTRO DE LA SEÑAL CODIFICADA ORIGINAL. EL PRIMER FILTRO PASABAJOS ANULA CUALQUIER PORTADORA RESIDUAL DEL PRIMER MODULADOR QUE RESULTA DE LA INTERMODULACION DE LAS DOS FRECUENCIAS DE MODULACION QUE PODRIA SER AUDIBLE A SU SALIDA DEL DECODIFICADOR. LOS MODULADORES USADOS SON MODULADORES TIPO CONMUTADOR BAJOS EN RUIDO QUE MEJORAN EL PORCENTAJE DE RELACION DE SEÑAL CON RESPECTO A RUIDO DE LA SEÑAL DECODIFICADA POR ENCIMA DE LOS MODULADORES LINEALES PREVIAMENTE USADOS. EL USO DE MODULADORES TIPO CONMUTADOR PROPORCIONA UN DISPOSITIVO DE MAS BAJO COSTO CON CARACTERISTICAS MEJORADAS. UN DISPOSITIVO CODIFICADOR COMPLEMENTARIO USA TECNICAS SIMILARES PARA PROPORCIONAR CARACTERISTICAS MEJORADAS A UN MENOR COSTO.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14506693A | 1993-10-26 | 1993-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2125494T3 true ES2125494T3 (es) | 1999-03-01 |
Family
ID=22511456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES94931915T Expired - Lifetime ES2125494T3 (es) | 1993-10-26 | 1994-10-18 | Metodo y sistema para criptografiar y descriptografiar señales de audio. |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0744105B1 (es) |
| JP (1) | JP3150700B2 (es) |
| KR (1) | KR100249656B1 (es) |
| AT (1) | ATE175063T1 (es) |
| AU (1) | AU695981B2 (es) |
| CA (1) | CA2181691C (es) |
| DE (1) | DE69415555T2 (es) |
| DK (1) | DK0744105T3 (es) |
| ES (1) | ES2125494T3 (es) |
| HK (1) | HK1013747A1 (es) |
| MY (1) | MY111488A (es) |
| NZ (1) | NZ275269A (es) |
| TW (1) | TW311307B (es) |
| WO (1) | WO1995012922A2 (es) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4636853A (en) * | 1983-12-21 | 1987-01-13 | Zenith Electronics Corporation | Dynamic audio scrambling system |
| US5058159A (en) * | 1989-06-15 | 1991-10-15 | Macrovision Corporation | Method and system for scrambling and descrambling audio information signals |
| US5159631A (en) * | 1990-04-26 | 1992-10-27 | Macrovision Corporation | Audio scrambling system using in-band carrier |
-
1994
- 1994-10-18 NZ NZ275269A patent/NZ275269A/en unknown
- 1994-10-18 JP JP51324395A patent/JP3150700B2/ja not_active Expired - Lifetime
- 1994-10-18 DE DE69415555T patent/DE69415555T2/de not_active Expired - Fee Related
- 1994-10-18 AT AT94931915T patent/ATE175063T1/de not_active IP Right Cessation
- 1994-10-18 DK DK94931915T patent/DK0744105T3/da active
- 1994-10-18 CA CA002181691A patent/CA2181691C/en not_active Expired - Fee Related
- 1994-10-18 EP EP94931915A patent/EP0744105B1/en not_active Expired - Lifetime
- 1994-10-18 WO PCT/US1994/011891 patent/WO1995012922A2/en active IP Right Grant
- 1994-10-18 AU AU80828/94A patent/AU695981B2/en not_active Ceased
- 1994-10-18 KR KR1019960703240A patent/KR100249656B1/ko not_active IP Right Cessation
- 1994-10-18 ES ES94931915T patent/ES2125494T3/es not_active Expired - Lifetime
- 1994-10-25 MY MYPI94002827A patent/MY111488A/en unknown
- 1994-12-02 TW TW083111250A patent/TW311307B/zh not_active IP Right Cessation
-
1998
- 1998-12-23 HK HK98114981A patent/HK1013747A1/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CA2181691C (en) | 2000-10-17 |
| JP3150700B2 (ja) | 2001-03-26 |
| AU8082894A (en) | 1995-05-23 |
| JPH10500259A (ja) | 1998-01-06 |
| HK1013747A1 (en) | 1999-09-03 |
| CA2181691A1 (en) | 1995-05-11 |
| DK0744105T3 (da) | 1999-08-23 |
| WO1995012922A2 (en) | 1995-05-11 |
| AU695981B2 (en) | 1998-08-27 |
| NZ275269A (en) | 1998-08-26 |
| EP0744105A1 (en) | 1996-11-27 |
| DE69415555D1 (de) | 1999-02-04 |
| KR100249656B1 (ko) | 2000-03-15 |
| DE69415555T2 (de) | 1999-05-12 |
| ATE175063T1 (de) | 1999-01-15 |
| MY111488A (en) | 2000-06-30 |
| WO1995012922A3 (en) | 1995-07-13 |
| EP0744105B1 (en) | 1998-12-23 |
| TW311307B (es) | 1997-07-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| NZ334843A (en) | Frequency division multiplexed transmission of sub-band signals | |
| CA2185649A1 (en) | Frequency transpositional hearing aid with digital and single sideband modulation | |
| KR940704104A (ko) | 다중 채널 텔레비젼 신호 스크램블링과 디스크램블링 시스템 및 방법(multichannel television signal scrambling and descrambling system and method) | |
| EP0266756A3 (en) | Jamming signal scrambling and descrambling systems for catv | |
| US5471531A (en) | Method and apparatus for low cost audio scrambling and descrambling | |
| US6167241A (en) | Technique for performing amplitude modulation without cheating side-bands | |
| GB1526517A (en) | Amplitude limiting circuit for frequency modulated video signals | |
| ES2125494T3 (es) | Metodo y sistema para criptografiar y descriptografiar señales de audio. | |
| ES2161707T3 (es) | Circuito modulado en frecuencia de multiples etapas. | |
| MY116925A (en) | Apparatus for demodulating am data multiplexed modulated wave signal | |
| ATE6185T1 (de) | Fernsehempfaenger mit einem nach dem differenztraegerverfahren arbeitenden tonkanal. | |
| SU1665517A1 (ru) | Передатчик амплитудно-модулированных сигналов | |
| JPS5820189B2 (ja) | 映像信号伝送におけるスクランブル装置 | |
| JPS5797277A (en) | Television video audio simultaneous transmitter | |
| EP0769875A3 (en) | Video modulator arrangements | |
| RU94035701A (ru) | Устройство для передачи дополнительной информации по каналу укв-вещания | |
| KR940008411A (ko) | 멀티(Multi)방송 방식의 고주파(RF)변조장치 및 방법 | |
| SE8800430D0 (sv) | Loudspeaker having open-filter frame of continuous v v shape in cross section and wave modulation plate of same design | |
| KR930022840A (ko) | 다중상제거 송수신장치 | |
| KR970063973A (ko) | 시더블유(cw)신호의 재생장치 | |
| KR890001269A (ko) | Rf 변조기 | |
| JPS6221391A (ja) | スクランブル装置 | |
| JPS5820191B2 (ja) | 映像信号伝送におけるデイスクランブル装置 | |
| RU2032991C1 (ru) | Устройство секретной телефонной связи | |
| KR890016857A (ko) | 인밴드 어드레서블 ca tv 시스템 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG2A | Definitive protection |
Ref document number: 744105 Country of ref document: ES |