MX166733B - Sistema de transmision estereofonico compatible y receptor de señal multicanalizada - Google Patents
Sistema de transmision estereofonico compatible y receptor de señal multicanalizadaInfo
- Publication number
- MX166733B MX166733B MX010754A MX1075488A MX166733B MX 166733 B MX166733 B MX 166733B MX 010754 A MX010754 A MX 010754A MX 1075488 A MX1075488 A MX 1075488A MX 166733 B MX166733 B MX 166733B
- Authority
- MX
- Mexico
- Prior art keywords
- signal
- difference
- stereo
- compressed
- stereophonic
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 title abstract 2
- 230000005236 sound signal Effects 0.000 abstract 3
- 230000000295 complement effect Effects 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
- H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
- H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
- H04H20/48—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for FM stereophonic broadcast systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Stereo-Broadcasting Methods (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Transmitters (AREA)
- Noise Elimination (AREA)
Abstract
La presente invención se refiere a un sistema de transmisión estereofónico compatible, que incluye un transmisor para generar y transmitir una señal multicanalizada modulada en frecuencia, derivada de las señales estereofónicas de audio izquierda y derecha y que incluye una señal de suma, una señal S de diferencia estereofónica modulada en amplitud en una primera sub-portdora, una versión S' comprimida de la señal de diferencia estereofónica modulada en amplitud en una sub-portadora de cuadratura, y una señal piloto, y un receptor para recibir la señal multicanalizada modulada en frecuencia y derivando de la misma señal de suma, y la señal S de diferencia estereofónica, la señal S' de diferencia estereofónica comprimida y la señal piloto, e incluye un elemento para expandir la señal de diferencia estereofónica comprimida, a fin de obtener una versión reducida en ruido de la señal S de diferencia y un elemento para combinar la versión reducida en ruido de la señal de diferencia estereofónica, con la señal de suma derivada, a fin de obtener las señales estereofónicas de audio izquierda y derecha, caracterizado porque el transmisor incluye un elemento para cambiar la fase de las señales de audio contenidas en la señal S' de diferencia estereofónica comprimidad en 180 grados, con relación a las señales de audio correspondientes, contenidas en la señal S de diferencia estereofónica, y un elemento para igualar el espectro de frecuencia de audio de la señal de diferencia estereofónica comprimida, para que corresponda aproximadamente a la respuesta de sonoridad del oído humano, a fin de reducir al mínimo la intermodulación, en un receptor estereofónico modulado en frecuencia convencional, desde la señal S' de diferencia comprimidad a la señal de diferencia estereofónica, sin disminuir la reducción de ruido percibida en el receptor del sistema, y además caracterizado porque el receptor incluye un elemento para igualar la señal S' de diferencia estereofónica comprimida, derivada casi complementariamente con la igualación de la misma en el transmisor, y un elemento para invertir la fase de la señales de audio contenidas en la señal S' de diferencia estereofónica comprimida igualada.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/030,223 US4752955A (en) | 1987-03-25 | 1987-03-25 | FM stereophonic system having improved compatibility in presence of multipath |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MX166733B true MX166733B (es) | 1993-02-01 |
Family
ID=21853161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MX010754A MX166733B (es) | 1987-03-25 | 1988-03-11 | Sistema de transmision estereofonico compatible y receptor de señal multicanalizada |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4752955A (es) |
| CN (1) | CN1014856B (es) |
| MX (1) | MX166733B (es) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4852167A (en) * | 1987-01-20 | 1989-07-25 | Sanyo Electric Co., Ltd. | FMX stereophonic receiver |
| KR960008328B1 (ko) * | 1987-02-20 | 1996-06-24 | 상요덴기 가부시기가이샤 | 스테레오 방송수신기 |
| US4916741A (en) * | 1987-03-27 | 1990-04-10 | Sanyo Electric Co., Ltd. | FM/FMX stereophonic receiver |
| US4817151A (en) * | 1987-11-09 | 1989-03-28 | Broadcast Technology Partners | Selective decoder for compatible FM stereophonic system utilizing companding of difference signal |
| US5046129A (en) * | 1989-01-24 | 1991-09-03 | Bose Corporation | Reducing phase error in received FM multiplex signal |
| US5375259A (en) * | 1992-02-20 | 1994-12-20 | Lee; Denny L. Y. | Analog signal noise reduction process and apparatus |
| US5953067A (en) * | 1997-02-10 | 1999-09-14 | Cable Electronics, Inc. | Multichannel television sound stereo and surround sound encoder |
| JP3233880B2 (ja) * | 1997-08-21 | 2001-12-04 | 沖電気工業株式会社 | 周波数変調信号送信機 |
| US6288747B1 (en) | 1997-08-25 | 2001-09-11 | Cable Electronics, Inc. | Multichannel television sound stereo and surround sound encoder suitable for use with video signals encoded in plural formats |
| EP1289158A1 (en) * | 2001-08-24 | 2003-03-05 | Sony International (Europe) GmbH | Method for noise reduction of a FM signal |
| EP1289157A1 (en) * | 2001-08-24 | 2003-03-05 | Sony International (Europe) GmbH | Linear phase compander for FM broadcast |
| US6646500B2 (en) * | 2002-04-02 | 2003-11-11 | Motorola, Inc. | Integrated circuit having an FM demodulator and method therefor |
| EP1367746A1 (en) * | 2002-05-21 | 2003-12-03 | Sony International (Europe) GmbH | Compression of audio signals in a FM transmitter |
| KR100677119B1 (ko) * | 2004-06-04 | 2007-02-02 | 삼성전자주식회사 | 와이드 스테레오 재생 방법 및 그 장치 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3594506A (en) * | 1968-04-01 | 1971-07-20 | Columbia Broadcasting Systems | Loudness level indicator |
| US4534054A (en) * | 1980-11-28 | 1985-08-06 | Maisel Douglas A | Signaling system for FM transmission systems |
| US4388493A (en) * | 1980-11-28 | 1983-06-14 | Maisel Douglas A | In-band signaling system for FM transmission systems |
| US4485483A (en) * | 1983-03-18 | 1984-11-27 | Torick Emil L | FM Stereophonic system incorporating companding of difference signal |
| US4602380A (en) * | 1985-01-04 | 1986-07-22 | Cbs Inc. | Compatible transmission techniques for FM stereophonic radio and television |
| US4602381A (en) * | 1985-01-04 | 1986-07-22 | Cbs Inc. | Adaptive expanders for FM stereophonic broadcasting system utilizing companding of difference signal |
| US4704727A (en) * | 1985-11-27 | 1987-11-03 | Beard Terry D | Low noise and distortion FM transmission system and method |
-
1987
- 1987-03-25 US US07/030,223 patent/US4752955A/en not_active Expired - Fee Related
-
1988
- 1988-03-11 MX MX010754A patent/MX166733B/es unknown
- 1988-03-21 CN CN88101474.5A patent/CN1014856B/zh not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4752955A (en) | 1988-06-21 |
| CN1035217A (zh) | 1989-08-30 |
| CN1014856B (zh) | 1991-11-20 |
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