MX9704045A - Video modem. - Google Patents

Video modem.

Info

Publication number
MX9704045A
MX9704045A MX9704045A MX9704045A MX9704045A MX 9704045 A MX9704045 A MX 9704045A MX 9704045 A MX9704045 A MX 9704045A MX 9704045 A MX9704045 A MX 9704045A MX 9704045 A MX9704045 A MX 9704045A
Authority
MX
Mexico
Prior art keywords
wires
signal
telephone
emphasis
mhz
Prior art date
Application number
MX9704045A
Other languages
English (en)
Other versions
MXPA97004045A (es
Inventor
Steven Rogers
John S Geric
Original Assignee
Objective Communications Inc
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 Objective Communications Inc filed Critical Objective Communications Inc
Publication of MXPA97004045A publication Critical patent/MXPA97004045A/es
Publication of MX9704045A publication Critical patent/MX9704045A/es

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/148—Interfacing a video terminal to a particular transmission medium, e.g. ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/02—Colour television systems with bandwidth reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/0806—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division the signals being two or more video signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/108—Adaptations for transmission by electrical cable the cable being constituted by a pair of wires

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Color Television Systems (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Television Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

Se proporcionan un aparato y un método para modular y transmitir señales de video en color, calidad television, de movimiento completo, junto con señales de datos digitales sobre un par de cables telefonicos del tipo conductor doble retorcido y sin proteccion (UTP), sin interferir con los datos telefonicos normales que llevan los cables. La invencion se caracteriza por un método de transmision que involucra la modulacion de frecuencia (VCO1) de una señal de video de banda base y el filtrado subsecuente (BPF1) para suprimir una banda lateral superior que corresponde a un componente de color de la señal original. La señal filtrada es recibida desde los cables telefonicos en una ubicacion diferente, es filtrada, demodulada y proporciona a un dispositivo de exhibicion visual. Es posible una modulacion duplex completa sobre el mismo par de cables, de manera que las dos señales de video pueden transmitirse simultáneamente, cada una de las señales tiene una anchura de banda adecuada de 6 MHz y se desplaza a una ubicacion de frecuencia no interferente, deseada, dentro de los aproximadamente 20 MHz de la anchura de banda utilizable en los cables telefonicos. No se requiere de pre-acentuacion o des-acentuacion para lograr una buena calidad de video transmision.
MX9704045A 1994-12-01 1995-12-01 Video modem. MX9704045A (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/352,112 US5621455A (en) 1994-12-01 1994-12-01 Video modem for transmitting video data over ordinary telephone wires
US08352112 1994-12-01
PCT/US1995/014946 WO1996017474A1 (en) 1994-12-01 1995-12-01 Video modem

Publications (2)

Publication Number Publication Date
MXPA97004045A MXPA97004045A (es) 1998-02-01
MX9704045A true MX9704045A (es) 1998-02-28

Family

ID=23383842

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9704045A MX9704045A (es) 1994-12-01 1995-12-01 Video modem.

Country Status (9)

Country Link
US (2) US5621455A (es)
EP (1) EP0795252A4 (es)
JP (1) JPH10510119A (es)
CN (1) CN1109441C (es)
AU (1) AU4365296A (es)
CA (1) CA2206521C (es)
MX (1) MX9704045A (es)
TW (1) TW344924B (es)
WO (1) WO1996017474A1 (es)

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Also Published As

Publication number Publication date
US5786844A (en) 1998-07-28
AU4365296A (en) 1996-06-19
WO1996017474A1 (en) 1996-06-06
US5621455A (en) 1997-04-15
CN1171876A (zh) 1998-01-28
CA2206521C (en) 2001-01-30
CN1109441C (zh) 2003-05-21
EP0795252A1 (en) 1997-09-17
TW344924B (en) 1998-11-11
CA2206521A1 (en) 1996-06-06
JPH10510119A (ja) 1998-09-29
EP0795252A4 (en) 1998-09-16

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