FR2630604A1 - METHOD AND APPARATUS FOR COMMUNICATION BY INTEGRATED SUBCARKERS IN AN ANALOG OR DIGITAL SIGNAL - Google Patents

Abstract

Device intended for the restitution of digital or analog information, obtained from a sub-carrier modulator at the transmission source and received by a sub-carrier demodulator, from any analog or digital signal single broadcast by land or radio. It includes a set of peripherals connected to a central management computer 1 to 7; the latter sending, in the form of two channels, the information to a modulator of sub-carriers 9 to 14. This modulator transmitting all of its information by terrestrial or radio channel 15, 16. A demodulator of sub-carriers 8 to 13 receives by terrestrial or radio channel 1 to 14 the single analog or digital signal, decodes it and transmits the information received, analog or digital 14 to 16, to the designated media.

Description

To A 2630604

  METHOD AND DEVICE FOR COMMUNICATION, BY

  SUB-CARRIERS INTEGRATED IN AN ANALOG SIGNAL

OR NUMERIC.

  The present invention relates to a method and a communication device,

  by subcarriers integrated in an analog or digital signal.

  Current terrestrial communication systems (special link

  telecom) or wireless (radio, satellite), carry a single

  within their original signal.

  Certain communication systems operating by land-line specialized

  satellite, have within their original signal a

  digital integration for service signals for the remote control.

  In general, this digital integration is inserted towards the end of the band

  origin and therefore only one subcarrier, taking into account the bandwidth. One of these systems is known as

of DBR.

  Another communication system operating over the air (radio

  FM) also exists and is known as SCA.

  This system, in general, is integrated after the multiplexed signal of the analogue channel.

  logic, around 60 KHz. This subcarrier makes it possible to obtain a path

  audio or digital information.

  The object of the invention is to increase the number of transmissible subcarriers in an analog or digital signal and thus to increase the possibilities

  transmitting said analog or digital signal.

  This goal is achieved for all modes of transmission be they terrestrial

  or wireless through a method and a specific implementation device.

  Method according to the invention with regard to a transmission source subcarrier modulator and a subcarrier demodulator in reception of the

source of emission.

  Digital and analog information to be transmitted on a single signal

  analog or digital, are modulated into subcarriers by the modulator.

  To do this, the modulator breaks down the analogue or digital signal

  in two different or identical frequency bands.

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  Different in order to obtain sufficient bandwidth for support beyond

  quality diophonics in the first frequency band; in this case, the modulator modulates two subcarriers for the digital information or

  a sub-carrier in the audio channel in the second frequency band.

  Identical frequency bands if you do not want quality audio support; in this case, the modulator modulates in each frequency band two sub-carriers for the digital information or a sub-carrier in audio track. So, in this case, we get on the transmission

  of a single analogue or digital signal, four subcarriers for

  digital trainings or two subcarriers in audiophonic lanes.

  In reception of said basic analog or digital signal, whether terrestrial or wireless, a subcarrier demodulator reshapes and distributes or

  two pieces of digital information or one audiophonic channel, or four

  digital training or two audio channels.

  At the reception also, the choice between the digital information and the tracks

  the audiophonic system is done by means of an automatic command

  from the transmission source by the subcarrier modulator.

  Device for implementing the method according to the invention comprising: In transmission A central management computer receiving its peripherals:

  image server, text server, audiophonic audiophonic control, etc.

  for digital information; Sound control for audio support

  quality or for at least one audiophonic channel.

  This digital or analog information to be transmitted arrives at a modula-

  subcarrier carrier with - an 8 kHz filter for sending a quality audio source, tape

passing: 50 HZ ... 8 KHz.

  - A 4.5 KHz filter for sending a bandwidth audio channel:

Hz ... 4.5 KHz.

  - Subcarrier modulation for the following filter.

  - A 12 kHz filter for sending digital information.

  - A mixer mixing the filters of 8 KHz and 12 KHz.

  In reception: A receiver according to the type of reception desired, for example: a demodem for the reception of a dedicated line, a satellite receiver for the reception of a satellite, a receiver demodulated in frequency for the

  reception of a frequency modulated radio wave, ...

  A subcarrier demodulator output from the receiver and comprising:

  - A formatting of the analog signal.

  - An 8 kHz filter that reproduces quality audio support.

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  - A formatting of digital signals.

  - A 12 kHz filter that restores digital information.

  - An amplifier of the preceding filter.

  - A subcarrier demodulator.

  - A 4.5 KHz filter with its de-emphasis and restoring the audiophonic channel.

  Note that the frequencies indicated for the filters are not fixed.

  According to a preferred embodiment of the invention, each piece of digital information

  is connected to a digital addressing. This digital addressing sends

  sixty-four digital information in deferred time and may, if it is

  to a digital audiophonic advertising department, to define the

  -ge specific audio messages.

  The invention will be explained in more detail by means of a nonlimiting exemplary embodiment described below with reference to the appended drawings in which:

  FIG. 1 schematically represents the subcarrier modulator in FIG.

  tuation. FIG. 2 schematically represents the demodulator of subcarriers in

situation.

  As represented in FIG. 1, a central computer for managing and directing

  ge 1 receives its peripherals which are, for example, an image server 2,

  a bright text server 3, a written text server 4, an audiophonic control

  advertising 5, and also by digital addressing 6 sixty other possibi-

  digital information services. All of these possibilities are divided

  by two by the computer and thus come out in the form of two lanes.

  Each of these channels enters the subcarrier modulator 8 on a wire.

  at 4.5 KHz 9 and 9 ', then a pre-emphasis 10 and 10' is performed; finally

  subcarrier modulation 11 and 1I 'is performed to obtain on a

  12 kHz 12 and 12 '. These two filters at 12 KHz lead to a mixer 13. This mixer also receiving an 8 KHz filter 14 which itself receives a control audiophonique7. The output of the mixer thus mixed and thus the

  output of the subcarrier modulator arrives at the audio input,

  logic or digital either of a modem type RS 232 for transmission by

  a dedicated line or an SCA 16 encoder for transmission on a transmission

frequency modulated transmitter.

  In Figure 2, the analogue or digital audiophonic output of the receiver

  requested, be it a demodem 1 for a specialized online reception, a

  satellite receiver 2, a receiver demodulated in frequency accompanied by a decoder

  SCA 3 or any other wireless receiver 4, is connected to the sub-receiver demodulator

  carriers 5 on its first input, through a shaping circuit 6, followed by its filter 7 at 8 KHz to restore the audiophonic quality channel and also on its second input, through a cirbuit shaping 8 followed by its 9 to 12 KHz filter and its amplifier 10, then its subcarrier demodulator 11 followed by its filter at 4.5 KHz 12 accompanied by its de-emphasis. The outputs of the filters 7 and 12 arrive on the digital addressing decoder circuit 13 controlled automatically. The outputs of this addressing are the final outputs: high quality analog output 14, output

  analog 15 and digital output 16 which can in series change several numeric

  : image screens, illuminated panels, printers, etc.

  The advantages of the device according to the invention are important: the possibility of being able to carry several digital information or

  analog signals on a single analog or digital signal, allows the user to

  to significantly increase its communication possibilities.

  - The addition of digital addressing to the device also allows the use of

  the user to be able to handle a very large number of messages and to ensure

  thus almost all the requests of the customers in communication.

  This product responds exactly to a significant demand from the communication market.

  in audiovisual media:

for example:

  Chains of department stores, cities, media, etc ...

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Claims (6)

Patent claims:   1. A method of communicating, from a set of digital and analog information, to be transmitted on a single analog or digital signal,   characterized by a subcarrier modulator adapting to all   terrestrial or wireless transmission systems, and characterized in that the reception of the single basic analog or digital signal is carried out   by a subcarrier demodulator distributing the digital information   analogous to the designated media.   2. Method according to claim 1, characterized in that the number of informa-   transmitted and received are: - two digital or one audio channel - four digital or two audio channels if you do not want   no quality audio support.   3. Process according to claims 1 and 2, characterized in that the choice   the analog and digital information is operated by switching   remote controlled automatic control from the emission source.   4. Device for the reproduction of digital and analogue information, obtained from a set, a management computer and its peripherals (1 to 6), characterized in that it comprises a subcarrier modulator   (8) having a first filter at 4.5 KHz (9 and 9 '), then a pre-emphasis   (10 and 10 '), then a modulation of subcarriers (11 and 11')   to obtain a 12 KHz filter (12 and 12 '). This filter results in a mixer (13). This same mixer also receiving an 8 KHz filter (14) which receives an audiophonic control (7). The mixer can be out on   a demodem (15) or on an SCA encoder (16); to attack any possibility   of terrestrial or terrestrial transmission, and characterized in that it   surrounds a subcarrier demodulator (5), receiving the unique analog signal   digital, in terrestrial (1) or terrestrial (2-4) form and   in shape (6 and 8) on a first 8 kHz filter (7) restoring the way to   quality diophonic as well as on a second filter at 12 KHz (9) followed by its amplifier (10) and its subcarrier demodulator (1l) accompanied by its filter at 4.5 KHz and its deemphasis (12), in order to   restore the digital information or analog audio channel. 6 2630604   5. Device according to claim 4 characterized in that a numerical addressing   It has been planned since transmission on the subcarrier modulator and is received in deferred time by the subcarrier demodulator.   its decoder (13) controlled automatically.   6. Device according to claims 4 and 5 characterized in that the outputs   analog (14,15) and digital (16) of the subcarrier demodulator   are provided for the desired audiophonic and visual media.