MX9604492A - Aparato para comunicaciones simultaneas de voz/datos a alta velocidad. - Google Patents

Aparato para comunicaciones simultaneas de voz/datos a alta velocidad.

Info

Publication number
MX9604492A
MX9604492A MX9604492A MX9604492A MX9604492A MX 9604492 A MX9604492 A MX 9604492A MX 9604492 A MX9604492 A MX 9604492A MX 9604492 A MX9604492 A MX 9604492A MX 9604492 A MX9604492 A MX 9604492A
Authority
MX
Mexico
Prior art keywords
digital data
voice
signal
precoded
modem
Prior art date
Application number
MX9604492A
Other languages
English (en)
Other versions
MXPA96004492A (es
Inventor
William Lewis Betts
Original Assignee
At & T Corp
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 At & T Corp filed Critical At & T Corp
Publication of MX9604492A publication Critical patent/MX9604492A/es
Publication of MXPA96004492A publication Critical patent/MXPA96004492A/es

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/497—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
    • H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

La presente invencion se relaciona con un modem de alta velocidad para transmitir simultáneamente señales de frecuencia vocal y señales de datos digitales precodificadas sobre un solo canal de comunicacion. El modem es operable para combinar una señal de frecuencia vocal con una señal de datos digitales precodificada para la transmision a las altas velocidades, niveles de energía altos y baja distorsion previamente alcanzable por los modems de solo datos de alta velocidad. La señal de frecuencia vocal es procesada usando las técnicas de procesamiento de datos convencionales para producir una señal de frecuencia vocal y una señal de control que contiene informacion relacionada con la codificacion de la señal de frecuencia vocal. La señal de control es multiplexada y representada para la transmision con los datos digitales. Los bits seleccionados de los datos multiplexados se usan para definir la rotacion de los datos digitales y hacer girar o rotar el vector de frecuencia vocal. Los datos digitales son precodificados para compensar y reducir al mínimo el ruido en el canal de comunicacion. El vector de frecuencia vocal que se hizo girar y los datos digitales precodificados son entonces combinados y transmitidos. En un lugar remoto, la señal transmitida es recibida por el modem receptor y es filtrada y separada para recuperar de este modo las señales codificadas individuales. La separacion de la señal de frecuencia codificada de la señal de datos digitales precodificada se efectua antes de la reconstruccion de la señal de datos digitales precodificada. Entonces se invierte la rotacion de la señal de frecuencia vocal codificada. Las señales de frecuencia vocal codificada y de datos digitales precodificada son entonces descodificadas individualmente para recuperar las señales de frecuencia vocal de datos que se originaron en el modem transmisor.
MXPA/A/1996/004492A 1995-10-10 1996-10-01 Aparato para comunicaciones simultaneas de voz/datos a alta velocidad MXPA96004492A (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/541,863 US5878077A (en) 1995-10-10 1995-10-10 Apparatus for high-speed simultaneous voice/data communications
US08541863 1995-10-10

Publications (2)

Publication Number Publication Date
MX9604492A true MX9604492A (es) 1997-07-31
MXPA96004492A MXPA96004492A (es) 1997-12-01

Family

ID=

Also Published As

Publication number Publication date
IL119376A0 (en) 1997-01-10
CA2184530A1 (en) 1997-04-11
EP0768781A2 (en) 1997-04-16
US5878077A (en) 1999-03-02
EP0768781A3 (en) 1997-05-02
JPH09200283A (ja) 1997-07-31
KR970024705A (ko) 1997-05-30

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