FR2719960A1 - Add=on module for use with radio pager e.g. for medical personnel - Google Patents

Abstract

The module includes a sound signal detector which controls coding circuits (CI2) and a modulator (CI1). An external modulation plug allows reception of messages generated at the output of a system, pref. a portable microcomputer, which transmits binary signals after reception of a message by a receiver in the pager. The module includes a moulded hard plastic casing (1) with a compartment housing a battery, and a sliding or hinged door. The compartment contains a miniature electret microphone (3) which picks up the signal from the pager which is inserted in the compartment. Light emitting diodes indicate correct operation of the equipment. An antenna can also be provided.

Description

01 The present invention consists of an additional module for

  owners of a pager,

  putting the transmission of an acknowledgment signal on a

  radio frequency when receiving a message.

  It will also allow the transmission of a message composed from

  shot of a portable PC intended for a subscriber of the telephone network

  than with a minitel or another pager owner.

  Currently when a person addresses a message with numeric or alphanumeric characters through a

  computer terminal, minitel or telephone for

  nation of an individual with a pager

  miscellaneous type, or any other system, it is

  likely to know for the caller, if his message was well

received by the called party.

  The device presented here according to the invention eliminates this problem. It is characterized in fact by a transmitter module which can be mechanically coupled as far as possible with the pager. When receiving a message on a pager,

  it beeps. The noise detector of the mo-

  The transmitter must therefore be tuned to this sound signal by means of an adjustable resistor the first time. Thereafter, each time a message is received on the pager, the sound signal generated will be detected by the stereo decoder (from the transmitter module) tuned to the same frequency, will command the activation of an encoder, modulator and transmitter module,

  allowing the transmission of an acknowledgment of receipt on a

  radio frequency. This module will also have a

  external modulation socket for receiving messages

  ges generated from a laptop (or any other system) by the owner of the pager, in order to transmit them on a radio frequency towards a service, which will be able to transport them to a subscriber of the equipped telephone network a phone, minitel, IBM / PC or another owner

to pager.

  According to particular embodiments: FIG. 1 represents the mechanical aspect of the module: The transmitter module will be integrated into a molded hard plastic case (1). It will include a compartment allowing

  place a battery. A sliding or articulated hatch (2) allows

  will close this compartment. The case will be per-

  drilled in the place where the miniature micro electret (3) will be located, thus facilitating the reception of the sound signal coming from the pager. A hole of two millimeters in diameter on the side

  of the device will reveal a green LED (4) per-

  putting to control the proper functioning of the latter, during a radio broadcast. A slide switch (5) located next to the LED will allow the start or stop

  of the module, this last function thus cutting the possibility

  Please send an automatic acknowledgment signal or any other message that may come from inside or outside this system. A six-pin connector (6) will be available at the base of the device for receiving

  signals and power from the outside.

  - Points 1 and 2 brought into contact by means of a

  positive outside will allow the transmitter module to start up. - Point 4 disconnected from point 3 after the transmission of

  identification code can be switched to a device

  positive outside the module in order to transmit data on the radio frequency. The signals will have to

be provided in binary form.

  - Point 5 supplies the module with negative voltage. - Point 6 allows the module to be supplied with voltage

positive.

  An antenna socket (7) will also be available. She for-

  ra be used to deliver the radio signal to a

  linear amplifier allowing the radio power of the module to be increased

  the transmitter from one milliwatt to seven watt. It is possible to

  However, this high frequency power amp is integrated into the transmitter module. The right side of the device will be equipped

  a cover (8) which will be fixed by two Phillips screws (9).

  The dimensions of the transmitter module will be of the order of one hundred millimeters for the length, fifty millimeters for the

  width and twenty millimeters for thickness.

  Figure 2 shows the operating diagram: - The audio signal emitted by the pager is detected by the

  stereo decoding circuit of the transmitter module.

  - Excitation of transistor T1 serving as a switch.

  - T1 energizes the coding circuits, modulator

and transmitter.

  - sending of the acknowledgment of receipt.

- stop excitation of T1

  - power off of the encoder, module elements -

originator and transmitter.

  FIG. 3 represents the electronic diagram of the module:

(B) Represents the battery.

(I) Represents the switch.

  (P1 / 6) Connection points of the 6-pin connector.

  Description of the tone detector produced with (CI3):

  (M) Represents a miniature electret microphone responsible for capturing

  the audio signal from the pager.

  (Ajl) is an adjustable resistance of 10 K allowing

  glue the input level of CI3 through a capacitor

polarized C4 with a value of 10 VF.

  (C4) the positive side of this capacitor is connected to the

  input leg # 16 of the operational amplifier.

  (Aj2) with a value of 10 K coupled to a capacitor of 10 nF allows tuning CI3 on the frequency of the sound signal

intercepted by the microphone (M).

  (C3) is a 0.22 gF capacitor connected in-

  be the legs 3 and 4 of the first comparator of CI3.

  (C4) is a capacitor with a value of 0.22 iF connected in-

  be the legs 6 and 7 of the second comparator of CI3.

  (C1) is a 10 nF capacitor with one end

  is connected to the input leg 5 of the frequency pi-

  lot and the other on 12/11/14 of CI3.

  12/11/14 are connected to ground through a resistor

  tance Rl of 3.3 K. (CI3) is a stereo decoding integrated circuit of the TCA 4511-2 type intended to detect a pilot signal of 19 Khz and emit an output signal on lug 18 when it identifies this frequency. The components used here

  with this circuit allow it to be adapted for a

  much lower. The tab 17 allows the

circuit description.

  (D1) is a led diode connected to tab 18 lighting up when CI3 detects a sound frequency on which it

is granted.

  (R2) is a falling resistor of 300 n, one side of which is connected to + 9V and the other feeds the other end of the

led diode.

  (R3) is a basic resistance of 8 k connected on the lug 18 of CI3. The other side of (R3) is connected on the base

of a transistor T1.

  t (T1) is a PNP transistor of the type 2N2906 silicon having a role of switch at the level of the + 9V supply of the encoder, modulator and emitter circuits. The transmitter

  of the transistor is connected directly to + 9V. The collection

  is connected to the points necessary for the supply

  of the previously named circuits.

  Description of the coding circuit produced with CI2.

  (R4) is a 100 K resistor connected on one side to + 9V

  and on lug 13 of CI2 on the other.

  (C6) is a 180 pF capacitor connected on one side to ground and the other to lug 13 of CI2. Here we have

  an RC oscillator composed of R4 / C6 whose frequency pi-

lot is around 100 Khz.

  (S1 / 12) are DIL microswitches allowing to set the pat-

  test from 1 to 12 of CI2 to ground to compose 4096

  different coded combinations. However, micro-

  switch could be replaced by an EEPROM. In addition the use of a second CI2 triggered after the

  first would yield 16,777,216 combinations.

  (CI2) is an integrated circuit that can be used as an encoder or a decoder. This mode can be selected by connecting tab 15 to a high or low level. In the present case, the tab 15 will be connected to the + 9V during the supply by T1, CI2 therefore playing the role of coder. Leaving the

  binary train is carried out on leg 17.

  Description of the modulator circuit produced with CI3:

  (CI1) is an integrated circuit of type XR2206 having an audio modulator role. The output tab of CI2 will therefore be connected to the input tab n9 of CI1. Legs 1 and 12 are connected to ground. Leg 4 will be used for

supply CIl with + 9V through T1.

  (Aj2 / 3) are two adjustable resistors with a value of 220 K and determines the frequency F0 and Fl respectively. They are connected on one side to lug 8 and 7 of CI1 and to ground by the other. Aj2 and Aj3 can be adjusted from

  so as to obtain 2400 Hz for F0 and 1200 Hz for Fl.

  (CO10) is a capacitor with a value of 10 nF connected between lugs 5 and 6 determining the second parameter of the period. (R5) is a resistor of 220 n connected between pins 13 and 14 of CI1 allowing to intervene on the shape of the

output signal.

  (C7) is a 2.2 uF polarized capacitor, the least of which is

  connected to earth and most to lug 10 serving as by-

pass on CI1.

  (C10) is a 2.2 uF polarized capacitor, the most of which is connected to the output lug n 2 of CIl and the least

  goes to the part of the FM transmitter circuit.

  (R8 / 7) are two 47k resistors for adjusting the audio output level of leg 2 of CI1. These two resistors must be of identical value. One of the ends of R7 and R8 are connected on leg 3 of

  CIl and others at plus and minus from food.

  (Cll) is a 10 pF capacitor also connected to leg 3 of

  CI1 and the other side of which is connected to ground.

  (C9) is a 2.2 gF / 25 V polarized filtering capacitor, connected between the least and the most of the power supply

from the T1 collector.

  Description of the FM transmitter circuit, band 87/108 MHz:

  The values of the components listed below may be changed

  managed according to the assigned frequency. An amplifier circuit

  HF fication can also be added and integrated into this

  transmitter module according to the authorized power.

  (Rll) is a resistance with a value of 150 k, one side of which is connected to the negative pole of C10. The other side of this resistor will modulate a varicap (DV) diode of any reference, the only condition being

be able to work in VHF.

  (CA2) The adjustable capacitor with a value of 4/20 pF is connected in parallel with a choke, one of the sides of these

  two components being connected to ground, the other the ca-

  varicap diode DV method, the collector of T2 and one of the sides of C12. To modify the working frequency of this transmitter, it will suffice to modify the values of

CA2 and Ll.

  (T2) is a PNP silicon transistor of the 2N2205 type, the base of which is connected to ground through an RC oscillator

composed of C14 and R10.

  (C14) is a capacitor with a value of 1.5 nF.

  205 (R10) is a resistance with a value of 47 k (C12) is a capacity of 15 pF connected between the collector and

the issuer of T2.

  (R9) is a resistor of 100 connected to + 9V on one side and to

the other's T2 transmitter.

  210 (R6) is a 1 M resistor connected to the + 9V on one side and to

the varicap DV diode on the other.

  (C13) is a 22 pF tuning capacitor connected between the

ground and DV.

  (CA1) is an adjustable 4/20 pF capacitor connected between DV

  215 and the antenna thus allowing its agreement.

  (CA3) is an adjustable 4/20 pF capacitor connected between the

  ground and the antenna thus allowing its agreement.

  (A) is an antenna which can be made with a ferrite bar and covered with a copper strip, 220 one of the ends of which will be connected to ground through

  CA3 and the other to the varicap diode DV through CA1.

  (P1 / 6) these points remain available in the event that we

  would hate to connect a computer to transmit data. These points will be directly accessible by

  225 through the connector (6) shown in Figure 1.

  All of these components can be welded on a plate.

  epoxy glass printed circuit board, integrating into

a plastic case.

  The device according to the invention is particularly

  230 intended for the equipment of all types of radio receiver

  paging, especially if it is capable of emitting a sound signal.

Claims (2)

REVENC: CATiONS. ai 1) Additional radio transmission module for radio paging receiver allowing the emission of acknowledgment of receipt upon reception of a message by the paging receiver characterized in that it comprises a detector of sound signal (M) emitted by the paging receiver which is a detector tuned to the frequency of the sound signal which controls the operation of the encoder (C12), modulator (C! 1) and transmitter circuits for transmitting the signal on a frequency radicelec-r that.   2) Additional module selo 'a qeconcue these r = = ica -'.   1 recent characterized in that it includes an external modulaticn allowing to receive messages generated from a system (in particular a portable mircrofdnaeour in order to emit its signals which are received under or eb nae after receipt of u.n   message by the receiver.   ! 5 3) Mo due 1 '- = a = o dd ... eî-to ia 3) odule addition.e l ................ so .... cao characterized in   that it is mechanically coupled with the pager.   4 M! Odule additon. seo 7n 'une cuel = o.su-e des rev' e dic tio ns   previous character in that of sound signal detector   carries a micro é2ec.re: or a Gold: responsible for capturing the   signal of the device of ra-domessagerie by mechanical cuplage.   ) Additional module sel on 'u-e qec ^ Cncue of claims: preceent-escaracterise ions in c qe es.c - sos c coded   sonc encoder circuit produced by "m. croswltchz or Sar" E_? RCM ".   Additional module salt: n u: .- e ruelccncu, previous revensdcatcns character-se in ue zrc meteur is a c-rcu:   transmitter in particular with -. n hnaue- amo-ificaCion circuit   frequency and oscillation on azcz-re for one year of broadcast on an assigned frequency.   7) Additional module selozn 'has claims characterizing in 3C that the transmitting antenna can be realized with a rod e f-ru v er_ d't.- e '' 'a-_ _-.