FR2559291A1 - METHOD FOR REMOTE CONTROL OF ELECTRICAL EQUIPMENT AND CORRESPONDING RECEIVER - Google Patents

Abstract

1. Process for the remote control of electrical equipments, wherein : A) in a transmission centre : - there is formed a digital signal corresponding to a function to be remote controlled, this signal is encoded by at least one error detecting and correcting code, the analog signal is modulated by the encoded digital signal and the modulated signal is transmitted to equipments to be remote controlled ; B) in receiving means associated with each of the equipments : - the transmitted signal is received, it is demodulated, the demodulated signal is decoded in order to retrieve the digital signal corresponding to the function to be remote controlled and a command for the execution of this function is generated, this process being characterized in that : A) in the transmission centre : - the digital signal is formed by an address word (A) and a function word (F), - this signal is successively processed by two error detecting and correcting codes, a first BCH code and a second REED-MULLER code, - a synchronization word (MS) is made to precede the doubly encoded signal, the synchronization word - address word - function word together forming a digital frame, - this frame is repeated cyclically, - each digital frame modulates a subcarrier (SP) with a phase shift modulation, - this subcarrier (SP) thus modulated is used in order to modulate the frequency of a carrier which is then radio transmitted by a frequency modulation radio transmitter ; B) in each receiver, - the transmitted signal is picked up by a tuned filter (10) coupled to an electric current distribution system (16) supplying the equipment to be remote controlled (50), - a frequency demodulation is carried out in order to retrieve the modulated subcarrier, - the subcarrier is demodulated by a phase shift demodulation in order to retrieve the digital frame, - the digital frame is processed firstly by recognition of the synchronization word (MS), then by a first REED-MULLER typ decoding, which enables the possible errors to be detected and corrected, and then by a second BCH type decoding, which enables the residual errors to be detected, and the digital signal is thus retrieved with its address word (A) and its function word (F), - the address word (A) is decoded, - the received address is comparied with the receiver's own address, - if the received address and the receiver's address are the same, the received function word (F) is processed by comparing it with a plurality of function words stored in the receiver, - the number of coincidences between the cyclically received function word and one of the stored function words is counted and, when this number reaches a predetermined value, a command for execution is initiated corresponding to this function in the associated equipment.

Description

2559291-

  Remote control method for electrical equipment and

corresponding receiver.

  The present invention relates to a method of

  remote control of electrical equipment and a

  receiver using this method.

  The technique of the remote control of

  from a central post office, implements,

  very generally, operations that are schematic

  the following: A) in a transmission center: - a digital signal is formed corresponding to a function to be controlled, this signal is coded by a

  or code (s) detector (s) and corrector (s) er-

  rers, an analog signal is modulated by the signal

  encoded and transmits to the

  remote control, the signal thus modulated; B) in a receiver associated with the device: - we receive the transmitted signal, we demodulate it, we decode the demodulated signal by correcting the possible ones

  errors, the corresponding digital signal is

  to the function to be remotely controlled and a

  order of execution of this function.

  The present invention relates to a method which falls within this very general framework, but which relates to a particular combination of means, chosen from

  in order to best solve the problems that are

  because of the very specific operating conditions

  process. The object of the invention is in fact to

  from a central station, electrical equipment located in private homes or in

  various premises. This command can take various

  pects: change the pricing in electric meters, order the start of organs

  electrical power, cause a load shedding of the power supply network

  255929f mentation, perform a download of information etc .... The various remote control commands that one

  wishes to treat in the invention may be

  diques (daily, weekly, monthly) or intervene at any time of the day by order of the electrical power distribution operating services. These orders can affect a family of devices or only certain

  of them, or even one of them.

  Such a service poses many problems.

  Indeed, when it comes to equipping devices intended for the general public, it is necessary that the cost of the organs to be added to the existing installations, (to enable them to receive and execute the remote control commands), be the lowest possible. We must therefore avoid sophisticated technical solutions that would lead to a prohibitive overcost. In addition, and for similar reasons, it is necessary that the remote control receiver is a small footprint and weight. In particular, it is excluded to provide such a receiver with a receiving antenna. That means

  that the operating conditions of the tele-

  control will be bad and that the signal to be processed in the receivers will be of very low amplitude. As a result, the risk of errors will be a priori high. However, it is impossible to admit such a risk, because of the application envisaged. Indeed, when it comes to modulating pricing or shutting down devices, any error would be particularly badly appreciated by users. Untimely tariff changes, for example, would cause countless conflicts between subscribers and the operating department. The reliability of such a system

so be almost perfect.

  Such a requirement is in contradiction with the previous ones, since a reduction of cost and a simplification of the structures are only accompanied by

  very rarely an improvement in reliability.

  Finally, it must be added that the very nature of the application envisaged by the invention assumes that a large number of subscribers (a few thousand or more) can be reached from a central remote control station. It then appears a problem of addressing information that is not found in the general technique of the remote control, where it is rather to remotely control a specific device. The invention provides a solution to all these problems by proposing an original combination of

  means which can be summarized schematically from the

next.

  A) In the transmission center, the operations performed are as follows: the digital signal is formed first of an address word which makes it possible to designate one of several receivers and a function word which makes it possible to choose one of several functions,

  - this digital signal is processed by two detection codes

  error correctors, a first code said BCH (BOSE-CHAUDHURIHOCQUENGHEM) then a second code called REED MULLER, (codes whose properties will be described later); - the double coded signal is preceded by

  obtained by a synchronization word, which will allow

  put the synchronization of the digital frame; the set of synchronization plus coded address word and function word constitute a digital frame,

  - this frame is repeated cyclically, which will allow

  error-free counting, each digital frame modulates a subcarrier by phase shift keying, this modulation

  having been chosen from all the possible modulations

  sibles (amplitude, phase, frequency, pulses, etc ...) for its adaptation to the operating conditions of the invention, (good resistance to noise and distortion, spectral efficiency

  high and above all the simplicity of the structure of the

  correspondent); the sub-carrier thus modulated is used to frequency modulate a carrier which is then

  radio broadcast, which allows the use of

  FM broadcast broadcasting already existing and considerably reduces the cost of the installation, B) in each receiver, the following operations are carried out: - the broadcast signal is captured by means of a tuned filter coupled to the distribution network of the current to avoid using an antenna,

  - a frequency demodulation is carried out to

  storing the modulated subcarrier, - the subcarrier is demodulated by a demodulation to

  phase shift to restore the digital frame

than,

  - the digital frame is processed first by a procedure

  recognition of the synchronization word, then by a first decoding of REED-MULLER, which makes it possible to detect and correct any errors (the use of the REED-MULLER encoding being

  particularly opportune here because of its

  this of correction and especially of its simplicity of implementation with the decoding), then by a second decoding

  using the BCH code, which makes it possible

  detect the residual errors, and thus restores the digital signal with its address word and its function word,

2559291 '

  - the address word is decoded, - the received address is compared with an address that is specific to the receiver, which allows the selection of one of several receivers, - if the received address and the address of the receiver - dent, we treat the received function word and compare it with a plurality of function words stored in the receiver, - we count the number of coincidences between the word of

  function received cyclically and one of the function words

  stored in the memory and, when this number reaches a predetermined value, an order

  execution of this function in the equipment as-

  company, this coincidence technique avoiding the unexpected triggering of a command on receipt of a single remote control signal, which could be erroneous. This general method can take various particular embodiments. For example, it is preferable to use two-state phase shift keying (MDP2) with coherent demodulation. In this case, the recognition procedure

  of the synchronization word is accompanied by a recognition

  birth of the complementary word, for this reason that coherent demodulation introduces an ambiguity of n

  on the phase of the recovered carrier.

  In another variant, and in order to limit the carrier recovery problems, the binary signal containing the information is combined with a pseudo-random binary signal by a modulo (2) (exclusive-OR) addition operation. This treatment allows a

  better distribution of the spectral power of the

  digital signal conveying information. At the reception

  Of course, the original frame is restored by combining the received signal with a pseudo-random signal identical to that which was used on transmission, by a modulo 2 addition. Such a technique makes it possible to avoid incidents related to the possible appearance

  a long series of bits equal to 0 (or 1).

  These scrambling and desiccating operations

  jamming require, on transmission as well as on

  tion, the use of two generators in a row

  identical do-random, delivering words of long

  greater than the length of the frame and

  in an initial state at each start of the frame.

  In addition to the address words and words of

  function, particular words may come into

  write in the data, if any. Indeed,

  some bits may be available as will be understood in the following example. If you wish

  ability to have superior addressing capacity

  re to thousand, we must use a word of address to 10 or

  11 bits (210 = 1024 and 211 = 2048). As in practice

  that the bits are grouped in bytes, the address signal shall comprise at least two bytes. If 11 of the 16 bits are used to build the address

  the other bits will remain available

  ble. They can be forced to 0, but some

  at least of them can be used in a variety of

  its configurations, which will correspond, by

  tion, to particular functions. These functions

  are for example the reset of the internal clock

  dull receivers or downloading memories.

  The reception of these particular configurations indi-

  than the receiver that the information that will follow

  will relate to these particular functions.

  Moreover, one can form a

  pleating ", in which the function bits are forced to 1, which ensures the receivers a

  continuity of operation, even in the absence of

Rational function data.

  Like some remote control signals

  must be received by all receivers it is born-

  the address word to accompany these signals must be recognized by all receivers. In other words, if each receiver must have a

  address of its own and which allows the identification

  proud, it must have a second, it will have in common with all other receivers, this second address to address simultaneously to all these receivers, general information (by

  example reset to the time of an internal clock).

  Regarding the synchronization word

  used at the head of the frame, it is advantageous to use

  tageuse a word with a peak autocorrelation important. In other words, the Hamming distance between the received word and the expected word varies abruptly when the expected word is received. For example, we can use the word 0EED (in hexadecimal notation) or any

another equivalent word.

  In practice, as indicated above, in MDP2, because of the uncertainty of the phase of the demodulated subcarrier, one seeks both this word

  synchronization and its complement.

  Recognition of a synchronization word

  tion uses known means. We will be able to

  for example, to the article by W. SHREMPP et al,

  entitled "Unique Word Detection in Digital Burst Com-

  "published in IEEE Transactions on Communi-

  cations Technology, vol. COM-16, No. 4, August 1968

pages 601-605.

  In the case of the invention, it can be required that the Hamming distance between the received word and the expected word be zero. But we can tolerate that

  distance equal to 1, provided that this distance

  this is confirmed on several successive frames. It is a matter of finding a fair compromise between the need not to make mistakes and the risk of

  never synchronize the receiver.

  As for the two error detection codes used according to the invention, if we know the BCH code well, for its simplicity and its great ability to

  detection, we are less familiar with the code of REED-

  MULLER. The choice of this second code is that, in addition to its large correction capacity, it is very simple to implement decoding. This property makes it possible to meet the requirement of low cost receivers. Although this code has a low WR (the number of redundancy bits is large compared to the number of information bits), this disadvantage is

  minor in the intended application since we are

  first and foremost to the correction power and the sim-

  pliability of implementation at decoding.

  As far as the definition is concerned,

  properties and the implementation of the detector and error correction codes, reference may be made

  on the part of C. Macchi and J. F. Guilbert

  "Teleinformatics" Chapter 4, and on the other hand, to G. Culmann's work entitled "WCodes detectors and error correctors", these two works being published

at Dunod (France).

  In any case, the characteristics of

  the invention will appear better after the description

  which will follow, of examples of realization given to

  to be explanatory and in no way limiting. This description

  refers to the attached drawings in which:

  FIG. 1 represents the spectrum of a

  composite used in modal broadcasting

Frequency

  Figure 2 is a diagram showing the organization

  of the digital frame used in the invention.

  3 is a block diagram of a receiver, FIG. 4 is a flowchart explaining FIG.

  the frame synchronization strategy in the re-

  ceptor, Figure 5 is a block diagram of the

decoder.

  In the current radio

  broadcasting using frequency modulation, the

  The signal modulating the carrier has a spectrum according to the diagram of FIG. 1. This so-called "composite" signal consists of: a monophonic signal M extending from 40 Hz to kHz; a pilot signal P at 19 kHz; stereo signal S extending between 23 and 53 kHz,

a subcarrier SP at 58.3 kHz.

  In the case of the invention, it is this

  subcarrier P which is modulated by the digital signal

  than to transmit, according to a two-phase phase shift keying (CDM2). The overall composite signal thus obtained (with its subcarrier modulated in MDP2) is applied to FM transmitters. To avoid risks of disturbances of the monophonic and stereophonic channels, the modulation rate of the subcarrier by the digital signal is limited to a few percent (for example 3%) of the

composite signal.

  The digital signal modulating the sub-

  carrier is organized according to a frame whose structure

  will now be specified, in the particular case

  2048 (211) subscribers at most, and o one remote control functions taken in a group that contains 256 (28). In this particular case, it therefore takes 11 bits to code the addresses of the receivers and 8 to code the functions,

in total 19 bits.

  On line (a) of Figure 2, we find

  the 19-bit word in question. To allow a

  partion functions, these 19 bits are coded on 3 bytes: the first byte (F) corresponds to the 8 bits used to define a function of remote control; the other two bytes contain the 11 address bits (A); the 5 bits provisionally unused can be set to 0 or can be used for

  particular purposes as explained above for

  kill a character word (C). These three bytes are

  shown in line (b) of Figure 2.

  At these 3x8 = 24 bits of information are added 18 bits of redundancy by BCH coding, which gives a word of 42 bits (line c). This BCH encoding is of type (42, 24) in that it provides 42 bits in total, for 24 bits of information. It can come from a classic code (63, 45) with 63 bits in total of which

information bits.

  The 18 control bits thus added allow

  will either detect up to 6 isolated errors,

  to detect all the error packets that have

  than 18 bits in length, the probability of non-detection

  error packets whose length is greater than

than 18 bits being 2-18.

  The 42 bits obtained after this first coding (24 useful bits, 18 control bits) are then processed, in groups of 6, (line d) by a REED-MULLER code of order 1, of total length 32 (6 bits useful, 26 bits of control). Such a code will allow

  correct up to 7 isolated errors.

  At this stage of the treatment, the digital message

  that includes 7 code words of 32 bits each (MC1, MC2 ... MC7). These words are represented on line (e). The message then comprises 7x32 = 224 bits. To these 7 words code of 32 bits is added a frame synchronization word, denoted MS, of 16

  bits. The set forms a digital frame (line f).

  It is this frame that modulates the subcarrier

in MDP2.

  The digital message is broadcast in a

  cyclical for a certain period of time, for example

  2 minutes. The length of the frame being 240 bits (16 + (7 x 32)) and the bit rate of 600 bits / s, there is

  so 300 shipments of the message in two minutes.

  It is not necessary to describe here the modulation means of the subcarrier, which are conventional. For example, for these questions of modulation (or demodulation) by phase shift to the French patent application

FR-A 2,428,345.

  Nor is it necessary to describe frequency modulation transmitters, which are

any known type.

  Figure 3 illustrates the general structure of a receiver according to the invention. This receiver comprises: - a wave collector 10, constituted by a tuned filter comprising a capacitor 12 inserted into the secondary of an isolation transformer 14 whose primary is connected to the current distribution network 16, and an amplifier transistor 18, - a radiofrequency stage 20 with an input 22 connected to the

  wave collector 10, this stage performing a demo-

  frequency modulation and outputting, at an output 24, a phase modulated subcarrier, - a phase demodulator MDP2 referenced 26, at a

  input 28 connected to output 24 of the radiofrequency stage

  20 and at a first output 30 delivering the digital frame, and at a second output 31 providing a clock signal, a digital decoder 32 with two inputs 34 and 35.

  connected respectively to exits 30 and 31 of the demo-

  dulator 26, this decoder having a group of outputs

  33, memories 36 connected to the decoder 32, a time base 38 also connected to the decoder, relays 401, 402, 403 controlled by the decoder

  and corresponding contacts 421, 422, 423.

  All of these means constituting the remote control receiver, is associated with an electrical equipment 50, which is for example a charging meter.

  As noted above, the col-

  wave reader 10 is one of the originalities of the

  vention. This provision leads to other

  that while giving satisfaction with regard to

  the low cost and the small footprint, it presents

  the disadvantage of being inefficient. As a result, if one wants to obtain the high reliability required,

  the information must be treated with the utmost care.

  ticular. Hence the two codings allowing the detection and the correction of the errors, the cyclic repetition

  of the frame and counting in the decoder.

  Circuit 20 has a conventional structure

  than. In an embodiment studied by the application

  radiofrequency characteristics of this cir-

cooked were:

  * Frequency range is 87.5-108 MHz.

  * Input level: between -103 dBm and -30 dBm

(OdBm = 1 milliwatt).

  * Input impedance: symmetrical value 300 ohms.

  * Stationary wave report at the entrance; 2.

* Noise factor: 5.5 dB.

  * Bandwidth of the input circuit> 2 MHz.

  * Image channel rejection> 80 dB.

  * Intermediate frequency rejection 100 dB.

  * Stability of the local oscillator: the local oscillator is slaved by an internal oscillator having

an instability of 2.10-5.

* Output impedance <1 kΩ.

  * Output level: OdB (reference: OdB corresponds to 0.775 volts effective) for a modulating signal of 1

  kHz in monophony and a 75 kHz excursion.

  * Amplitude-frequency response: - 0.5 dB from 40 Hz to 53 kHz + 3 dB from 53 kHz to 75 kHz * Overall harmonic distortion from 40 Hz to

kHz 0.5%.

  * Crosstalk attenuation:>, 40 dB in the band

400 Hz - 10,000 Hz.

  * Variation of the output level according to the input level: + 1 dB for a variation at the input of -103 dBm at

-30 dBm.

  * Monophonic signal-to-noise ratio after deaeration

  for an input signal of -103 dBm: 35 dB.

  The demodulator 26 is also a conventional circuit. It can be noted again that the choice of the modulation MDP2 causes a great simplicity of structure for this circuit, which reduces the cost of the receiver. The role of the circuit 26 is to isolate the subcarrier (SP) of the composite signal supplied by the circuit 20, to demodulate this subcarrier and to supply the decoder with the digital stream. The demodulator also provides the recovery function of the

255929 1

  carrier frequency and rhythm. On this subject we can

  consult the French patent FR-A 2,367,387.

  The description that follows is first and foremost about

  the decoder 32 and the associated means. This decoder has the function of processing the digital frame which is presented at its input 34, by means of the clock signal which appears at the input 35. At the input 34 the frame is in the form illustrated on FIG. line (f)

Figure 2.

* The decoder 32 must first receive the MS synchronization word and develop a frame synchronization strategy. According to the diagram of FIG. 4, the decoder is placed in one of the following four states: E2 state or search state:

  This is the initial state; the decoder

  check the synchronization word bit by bit. This type of research is traditional and there is no need to describe it in detail here. It is enough to remind that one measures the difference between the searched word and the received word. This difference is called "Hamming distance": it is exactly the number of binary elements of the same rank which differ in two words, or the weight, modulo 2n, of the sum of two words of n binary elements. the decoder has recognized the synchronization word with a Hamming distance

  d = 0 or 1, it initializes a counter modulo the length

  N of the frame and goes into a state E3.

E3 status or confirmation status:

  - After a count at N (length of the

  me), the decoder comes to control the sync word

  nization. If the recognition is done again with d = 0 or 1, the system goes into a new state E0 (after resetting the counter), otherwise

  it returns to state E2 and the counter is inhibited

  bé. E state or locked state: o In this state, the decoder is considered synchronized and the data are used (as will be seen later). The search for the synchronization word is continued with a period N and the system is maintained in this state as long as the

  Hamming distance calculated on the sync word

  is equal to 0 or 1. If it becomes

  greater than 1, the system goes to state E1.

  State E1 or state of alert: In this state, the data continue to be exploited. If the Hamming distance is 0 or 1,

  the system returns to E0. Otherwise (if d 1) the system

  I declare myself in a state of loss of synchronization, the data are no longer used, the counter

  modulo N is inhibited and the system goes to E2.

  Figure 5 shows the sequence of functions performed by the decoder. The represented blocks have the following meaning: 51: control of the synchronization word,

  52: Descrambling, this operation being optional

  as explained above and intervening only if, on transmission, the signal has been bleached by a pseudo-random scrambling signal;

  53: REED-MULLER decoding with correction of errors

rors,

  54: BCH decoding with residual error detection

  the; : processing of character bits, which are,

  as explained above, the bits remaining

  in the address octets (word C on the

  line b of Figure 2) and triggering

  for setting the time or downloading or for a filling frame, 56: processing of the address bits, 57: processing of the function bits, 58: validation by counting of the number of words of the

  function coinciding with a memorized word.

  More precisely, the operation of the decoder is as follows. When the system is in state E0, the frame alignment is assumed to be effective and

  the data is exploited by the decoder. This ex-

  operation eventually starts with the

  scrambling, then by implementing the REED-MULLER code for error correction. This code

  can correct up to 7 errors among the 32-bit

posing each code word.

  The 42 bits (6 bits for each of the 7 words)

  code) once grouped, the decoder implements the BCH code to detect residual errors. The 3

  bytes carrying the information are stored.

  When a message no longer contains a residual error after verification by the BCH code, the two address bytes (A) are decoded. If the address obtained is that of the receiver, the function byte F is compared to the 6 values contained in the memories 38. These 6 values correspond to the three contacts of the receiver (one value for the opening and one for the closing). When there is a tie between the function F

  received and one of these 6 values, a counter is in-

  crowned with a unit. There are as many counters as

  of memorized functions, ie 6 in the example taken.

  When the contents of one of these counters reaches a

  predetermined value, for example 6, an order of execution

  the function is generated and the six counters are reset. The order is validated. The order of execution of the order acts on the

255929 '

  401, 402, 403, which control the contacts 421, 422, 423. These contacts allow to establish or

  to interrupt connections belonging to the team-

to remote control.

  Naturally, it will be understood that the number of relays used in the illustrated example (3) is in no way restrictive and that in practice any number can be ordered, this number being however less than 2n-1. , if n is the number of function bits used on transmission (a contact can be opened or closed, it corresponds to

effect two functions).

  In practice, the means 38 for memorizing

  the various functions to be handled by the receiver can

  may be micro-switches ("microswitch" in English terminology). The receiver then comprises as many microswitches as functions, 6 in the example considered above. The functions are coded on a byte, these microswitches are 8 bits. Each of these organs makes it possible to recognize

a function among 256.

  The configuration of the byte memorized in each of the microswitches can be modified by

  download. This particular function is

  prompted by the appearance of the character words (C)

mentioned above.

  Although the decoder that has just been described can be realized in hardwired logic (registers, memories, counters, doors, etc ...) one may prefer

  use a microprocessor and pro-

  gram based on appropriate software.

Claims (10)

  1. A remote control method for electrical equipment, in which: A) in a transmission center: - a digital signal corresponding to a function to be remotely controlled is formed, this signal is coded by at least one detector code and error corrector an analog signal is modulated by the coded digital signal and the modulated signal is transmitted to the equipment to be controlled; B) in receivers associated with each of the apparatuses: the transmitted signal is received, it is demodulated, it is decoded   the demodulated signal to restore the digital signal   corresponding to the function to be controlled and an order is generated for executing this function, this method being characterized by the fact that: A) in the transmission center: - the digital signal consists of an address word (A) and a function word (F), - this signal is processed successively by two detector codes and error correctors, a first code BCH and a second code REED-MULLER, - the signal is doubled before coded by a   synchronization word (MS), the word syn-   chronization-word of address-word of function   killing a digital frame, - this frame is repeated cyclically, - each digital frame modulates a subcarrier (SP) by a phase shift keying, - this modulated subcarrier (SP) is used   to frequency modulate a carrier which is   broadcast by a broadcaster frequency modulation; 2559291 ' B) in each receiver,   - the broadcast signal is picked up by a filter   die (10) coupled to the distribution network (16) of   electric current supplying the equipment with order (50),   - a frequency demodulation is carried out to   storing the modulated subcarrier, - the subcarrier is demodulated by a demodulation to   phase shift to restore the digital frame than,   - we treat the digital frame first by recognizing   synchronization word (MS), then by a first REED-MULLER type decoding, which makes it possible to detect and correct any errors,   then by a second BCH decoding, which allows   detects residual errors, and we   Thus, the digital signal with its address word (A) and its function word (F) is decoded. The address word (A) is decoded. The received address is compared with an address specific to the receiver.   - if the received address and receiver address coincide   tooth, the received function word (F) is processed by comparing it with a plurality of function words stored in the receiver, - the number of coincidences between the word of   function received cyclically and one of the function words   stored in the memory and, when this number reaches a predetermined value, an execution command corresponding to this function is triggered in the associated equipment.   2. The process according to claim 1, wherein   characterized in that the phase shift keying is a two-phase phase shift keying (CDM2)   3. Process according to claim 2, characterized   the fact that the recognition of the synchronization word is accompanied by a recognition of the complementary word.   4. Method according to claim 1, characterized in that the emission is superimposed on the   data binary signal a pseudo binary signal   random addition modulo 2 and that at the reception   a pseudo binary signal is superimposed on the received signal   identical to the one used in   the emission, by the same operation of addition modulo 2.   5. The method of claim 1, wherein   characterized by the fact that the function word (F) is a byte.   6. The method of claim 1, wherein   because the address word (A) extends in two bytes.   7. The method of claim 6, wherein   since the address word (A) incompletely occupies these two bytes, and bits are thus unused, these bits are used to constitute a character word (C) corresponding to particular functions of the receiver, in particular to a setting. at the time of an internal clock or a download of function words.   8. Remote control signal receiver for implementing the method of claim 1, characterized in that it comprises: - a wave collector (10) consisting of a tuned filter coupled to the electrical power distribution network (16)   a radiofrequency stage (20) with an input (22)   connected to the wave collector, this stage performing a frequency demodulation and having an output (24) delivering a subcarrier,   a phase demodulator (26) at an input (28)   connected to the output (24) of the radio frequency stage (20) and to two outputs (30, 31) respectively delivering a digital frame and a clock signal, - a two-input digital decoder (32) (34, 35). )   connected respectively to the outputs (30, 31) of the demo   dulator (26), this decoder (32) comprising means for searching the synchronization word, REED-MULLER decoding means and BCH decoding means for decoding the received address word and   to compare the received address with a   pre to the receiver, means for comparing the received function word with stored function words   in the receiver and to count the number of   cidence between cyclically received words and one of the stored words and to trigger an order   when the result of this count reaches a certain their predetermined.   Receiver according to claim 8,   characterized by the fact that the means for memorizing the function words are micro-switches set   in a certain configuration, each microinter-   switch being associated with a validation counter.   Receiver according to claim 9,   characterized by the fact that each microswitch is downloadable.