A modulation device for paging transmitter (options)

 

(57) Abstract:

The invention relates to radiopaging system. The technical result consists in the development device 4-point frequency-shift keying. The modulation device includes a scheme of adjusting the voltage levels for the formation of four voltage levels, providing selective performing a 2-point or 4-point frequency-shift keying (FMN); decoder, an analog switch for selecting one of four voltage levels corresponding to the decoded signal, the adder amplifier audio frequency scheme selection input signal and filter, and to select one of the filtering circuits of the next cascade depending on the control signal, which selects the 2-position or 4-position FMN, for the development of the selected digital output voltage or the amplified audio signal passing through the selected filtering circuit and the bandpass filter. 3 S. p. f-crystals, 2 Il.

The present invention relates to radiopaging system and, in particular, to a device modulation used in paging transmitter.

Traditionally in paging transmitter used in the ri which is formed voltage, the corresponding "clicking" when using FMN is transmitted "1", and the voltage corresponding "release", when using FMN is transmitted "0", and then this voltage as the modulating is a voltage controlled oscillator, and simulating the voltage determines the frequency deviation of. However, 2-way FMN with NRZ used in conventional paging transmitters, in most cases, provides a maximum transfer rate of 2.4 kbit/s, which is too low and does not meet the requirements for high-speed data transmission necessary to implement modern service communication functions involving the transfer of large amounts of information.

Thus, the present invention is the task of developing a device for 4-point frequency-shift keying (FMN).

An additional object of the present invention is to develop a device for 2/4-way frequency-shift keying compatible with the relevant devices present on prior art.

In accordance with a feature of the invention, the modulation device used in paging transmitter, includes cf the e 2-point or 4-point frequency-shift keying (FMN); the decoding means for decoding the first and second input information signals and obtaining a decoded output signal; selector means for selecting one of four voltage levels corresponding to the decoded signal, based on the 2-position or 4-position FMN; summing means for adding the selected voltage level with a reference voltage and generate an appropriate digital output voltage; picker filter to select one of the circuits of the filter media filter according to the control signal, which selects the 2-position or 4-position FMN, and the control signal can be internal or external, for the development of the selected digital output voltage or the amplified audio signal passing through the selected filtering circuit; and filtering means for performing the first or second filter with a bandwidth corresponding to the 2-position or 4-position FMN, and for filtering the digital output voltage or audio signal, missed on one of the selected circuits of the filter.

The above and other objectives, features and advantages of the nation, given in conjunction with the accompanying drawings, in which Fig.1 shows a device 2/4-way FMN in accordance with a variant implementation of the invention; Fig.2 is a timing diagram illustrating a 2-level and 4-level output voltage generated at the output of the adder (40) after selecting the analog switch (30) when the input information signals corresponding to the MDR (Junior binary digit) and SDR (senior binary digits).

In Fig.1 shows an implementation of a device 2/4-way FMN in accordance with the preferred embodiment of the presents invention, this device includes a scheme of adjusting the voltage level of 10 for the formation of four voltage levels, providing selective performing a 2-point or 4-point frequency-shift keying (FMN); decoder 20 for decoding bit younger (TIR) and senior binary bits (SDR) and obtain the output of the decoded signal; an analog switch 30 to select one of four voltage levels corresponding to the decoded signal, based on the 2-position or 4-position FMN; the adder 40 cleavage voltage; amplifier audio frequency 60 for amplifying the input audio signal; scheme selection input signal and filter 50 to select the digital output voltage or the amplified audio signal depending on the input control signal selection, and to select one of the filtering circuits of the next cascade depending on the control signal, which selects the 2-position or 4-position FMN to form the selected digital output voltage or the amplified audio signal passing through the selected filtering circuit; and band-pass filter 70 to perform the first or second filtering bandwidth, the corresponding 2-position or 4-position FMN, and for filtering the digital output voltage or audio signal, missed on one of the selected circuits of the filter.

In Fig. 1,2 it is shown that the decoder 20 decodes the input information signals (MDR and SDR), and supplies the analog switch 30 decoded signal(00, 01, 10, 11).

In the schema level adjustment voltage 10 includes resistors R2, R4, R7, R9, connected to a reference voltage "Oporn. 5B", equal to 5 B, resulting in the analog switch 30 serves respectively of nuphedra what the voltages if necessary, can be accurately adjusted. For example, it is desirable that the voltage levels were chosen, respectively: V++=2,77 B, V+=2,59 B, V-=2,35 B,V--=2,13 B.

Analog switch 30 selects one of the voltages V++, V+, V-, V--schema-generated control voltage level 10, depending on the decoded signal(00, 01, 10, 11), coming from the decoder 20. For example, the voltage level V--is selected when the decoded signal is "00", V-when the decoded signal is "01", V+when the decoded signal is "10", V++when the decoded signal is "11". Thus, depending on the decoded signal can be freely selected mode 2-position manipulation (V++, V--) or mode 4-position manipulation (V++, V+, V-, V--).

In addition, the analog switch 30 can select 2-way or 4-way manipulation by external or internal control. That is, the analog switch 30 selects one of the voltages V++, V+, V-, V--schema-generated control voltage level 10, depending on the signal EXT./EXT. (2/4) Choice". Thus, mode 2-pbor".

The voltage selected by the analog switch 30, are formed with the reference voltage "Oporn. Level" in the adder 40, resulting in an appropriate level digital voltage, which is fed into the scheme selection input signal and filter 50. In the scheme selection input signal and filter 50 receives the audio signal amplified by the amplifier audio frequency 60, and the voltage level corresponding to the digital output voltage of the adder 40. In addition, the scheme selection input signal and filter 50 receives the signal "EN./Digits.The choice for selecting one of the input signals, and the signal "2/4 Choice for selecting filters the next stage (i.e., bandpass filter 70) depending on mode 2-position or 4-position manipulation. In this case, the scheme selection input signal and filter 50 selects one of the two input signals depending on the signal EN. /Digits. Choice", and selects the first band-pass filter 72 or the second bandpass filter bandpass filter 74 70 depending on the signal 2/4 Choice." Consequently, the voltage generated by the adder 40, served on the first or second band-pass filter 72, 74 through the scheme selection input signal and filter 50 at the output of filter 72, 74 at the input terminal of modulator "Ref.Module." the next stage, i.e., to a voltage controlled oscillator (VCO) (not shown).

In Fig.2 shows a timing diagram illustrating a 2-level and 4-level output voltage generated by the adder (40) after selecting the analog switch (30) depending on the input information signals corresponding to the MDR and SDR. It should be noted that, as mentioned above, the mode selector 2-position or 4-position manipulation is achieved by applying an external or internal signal EXT./EXT.(2/4)Choice". For example, mode 2-point manipulation is selected when the signal EXT. (2/4)Choice" has a low logic level, and mode 4-position manipulation is selected when the signal EXT./EXT.(2/4)the Choice is at a high logic level.

From the description it follows that the device presented in the invention is compatible with conventional modulation schemes 2-way FMN with NRZ and, in addition, allow you to select mode 2-position or 4-position FMN, providing high-speed transmission of information through a simple mode the 4-way FMN. Moreover, switching 2-point and 4-position relocates without modification of the modulating device.

The preferred embodiment given by way of example, and also as a means to explain the peculiarities of the development and performance of the device in accordance with the present invention. Specialists can be offered to other embodiments of the invention. The present invention limited to the above implementation option, as determined by the claims.

1. A modulation device for paging transmitter containing a means of adjusting the voltage level made with the possibility of the formation of four voltage levels, providing selective performing a 2-point or 4-point frequency-shift keying (FMN), the means for decoding the first and second input that is arranged to receive the output of the decoded signal, selector means is configured to select one of four voltage levels corresponding to the decoded signal, based on the 2-position or 4-position FMN, filtering, configured to implement the first or second filtering bandwidth, the corresponding 2-position or 4-position FMN and opportunity is litraly, characterized in that it includes summing means adding the selected voltage level with a reference voltage, configured to generate an appropriate digital output voltage, means for amplifying audio frequency, providing increased sound input signal, and means for selecting an input signal and filter made with a choice of digital output voltage or the amplified audio signal depending on the input control signal selection, and also with a choice of one of the chains filtering means for filtering depending on the control signal, which selects the 2-position or 4-position FMN, moreover, the control signal may be supplied internally or externally for the development of the selected digital output voltage or the amplified audio signal passing through the selected filtering circuit.

2. A modulation device for paging transmitter containing a means of adjusting the voltage level made with the possibility of the formation of four voltage levels, providing selective performing a 2-point or 4-point frequency-shift keying (FMN), the means for decoding the first and W is Torno means, made with a choice of one of four voltage levels corresponding to the decoded signal, based on the 2-position or 4-position FMN, filtering, made with the possibility of implementation of the first or second filter with a bandwidth corresponding to the 2-position or 4-position FMN, and filtering capabilities mentioned digital output voltage or mentioned audio signal, missed one of the above selected circuits filter, characterized in that it contains a summing means made with the possibility of adding a selected voltage level with a reference voltage and generate an appropriate digital output voltage, picker filter made with a choice of one of the circuits of the filter media filter according to the control signal, which selects the 2-position or 4-position FMN, and mentioned control signal may be internal or external, for the formation of one of the mentioned selected digital output voltage and the amplified audio signal while passing through the selected filtering circuit.

3. The device modulation peyrovani four voltage levels, providing a sample implementation of a 2-point or 4-point frequency-shift keying (FMN), selector means selecting one of four voltage levels corresponding to said signal, depending on the selection control signal used to select a 2-point or 4-positionnal FMN, and mentioned control signal selection can be made internally or externally, filtering, made with the possibility of implementation for the first or second filter with a bandwidth corresponding to the 2-position or 4-position FMN, and filters the digital output voltage or sound signal, missed on one of the selected circuits filter, characterized in that it contains a summing means adding the selected voltage level with a reference voltage and configured to generate an appropriate output digital voltage selector, filter, made with a choice of one of the circuits of the filter media filter according to the control of the select signal, and the control signal can be internal or external, for the formation of one of the selected digital output voltage is

 

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FIELD: radio communications.

SUBSTANCE: proposed method intended for single-ended radio communications between mobile objects whose routes have common initial center involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mentioned mobile objects and destroyed upon completion of radio communications. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning of several radio communication systems.

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1 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer from mobile object to stationary one residing at initial center of common mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhanced its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile object from stationary one residing at initial center of mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects whose routes have common initial center involves use of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety for attending personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in simultaneous functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects having common initial center involves use of low-power intermediate transceiver stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object and destroyed upon completion of radio communications between mobile and stationary objects. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications engineering; digital communications in computer-aided ground-to-air data exchange systems.

SUBSTANCE: proposed system designed to transfer information about all received messages irrespective of their priority from mobile objects to information user has newly introduced message processing unit, group of m modems, (m + 1) and (m + 2) modems, address switching unit, reception disabling unit whose input functions as high-frequency input of station and output is connected to receiver input; control input of reception disabling unit is connected to output of TRANSMIT signal shaping unit; first input/output of message processing unit is connected through series-connected (m + 2) and (m + 1) modems and address switching unit to output of control unit; output of address switching unit is connected to input of transmission signal storage unit; t outputs of message processing unit function through t respective modems as low-frequency outputs of station; initialization of priority setting and control units, message processing unit clock generator, and system loading counter is effected by transferring CLEAR signal to respective inputs.

EFFECT: enhanced efficiency due to enhanced throughput capacity of system.

1 cl, 2 dwg

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