JPH1094014A - Selective radio call receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the degradation in reception sensitivity by the influence of noise generated at the time of infrared ray data transmission by preventing the timings of a reception operation in a radio part and an infrared ray data transmission operation to the outside from being overlapped. SOLUTION: Radio signals received in an antenna 1 are amplified and demodulated in the radio part 2 and shaped to a waveform readable by a decoder 8 in a waveform shaping circuit 3. In the decoder 8, the calling number of the waveform shaping circuit 3 and its own calling number written in an EEPROM 12 beforehand are compared and message signals and data following the calling number are outputted to a CPU 10 when they match. In the CPU 10, when its own calling number and the message of the data from the decoder 8 are received, they are stored and preserved in a RAM 14. The data and the message signals stored in the RAM 14 are made to stand by until being outputted to the outside by infrared ray data transmission. Thus, the suplication of the data of the reception operation and a transmission operation is evaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio selective calling receiver, and more particularly to a radio selective calling receiver capable of outputting information such as received data to an external data terminal or the like by infrared rays.

[0002]

2. Description of the Related Art As a radio selective call receiver, a multi-function radio receiver capable of outputting a reception record and message information to an external data terminal or the like has been put to practical use. In this type of receiver,
As a method of outputting data to the outside, there are a method using an electrode and a method using a light emitting element as described in JP-A-62-268219. In the radio selective call receiver described in this publication, a light emitting element for visually performing a call notification is shared for external output of data, and in order to prevent confusion of operation,
A synchronization signal and an end signal are inserted before and after the externally output data so that the call notification signal can be distinguished from the externally output data.

[0003]

In such a conventional radio selective calling receiver, when a light emitting element for making a call notification is shared for external output of data, a synchronization signal is inserted before data to be externally output. In addition, it is necessary to provide a circuit for inserting an end signal after data, and there is a problem that a circuit configuration becomes complicated.

Therefore, it is conceivable to construct a radio selective call receiver having an infrared light emitting element for external output in addition to a light emitting element for making a call notification and having a function of transmitting data to the outside by infrared rays. In such a radio selective calling receiver, a boosting circuit for boosting a primary power supply voltage such as a dry battery is required to drive the infrared light emitting element. In addition, the current consumption of the infrared interface transmission unit including the infrared light emitting element and the driving circuit is much larger than the current consumption of other circuit blocks. Also, the transmission processing of the infrared data from the infrared interface transmission unit is as follows.
It is independent of the reception operation of the radio unit, and the transmission processing is performed by an external infrared data transmission command.

Therefore, in such a radio selective calling receiver, when the infrared transmission operation is performed during the reception operation in the radio section, or when the reception operation is started during the infrared transmission operation, the infrared interface transmission section is activated. Due to the operation, the current consumption from the primary power supply greatly fluctuates, and the noise generated from the booster circuit causes a problem that the receiving sensitivity of the radio unit is deteriorated.

In the radio selective call receiver described in Japanese Patent Application Laid-Open No. Hei 3-226029, a secondary battery for driving a speaker and a vibrator for notifying a call is separately provided, and a notification means is driven. Even in such a case, a proposal has been made not to affect the power supply line of the wireless unit.However, the present invention that attempts to prevent sensitivity deterioration in the wireless unit when externally outputting received information by infrared rays,
The configuration is different.

In the radio selective calling receiver described in Japanese Patent Application Laid-Open No. 4-45620, a proposal has been made to reduce high-frequency noise flowing in a signal line by inserting a resistor in a signal line between ICs. However, the technical configuration is different from the present invention.

The present invention has been proposed in order to solve such problems of the prior art, and is intended to prevent the timing of the receiving operation in the radio section and the infrared data transmitting operation to the outside from overlapping. Accordingly, it is an object of the present invention to provide a radio selective calling receiver capable of preventing deterioration of reception sensitivity due to the influence of noise generated when transmitting infrared data.

[0009]

In order to achieve this object, a radio selective calling receiver according to the present invention comprises a radio section, a memory for storing information, and an infrared data transmitting section for outputting information to the outside by infrared rays. And an infrared data transmission control unit that controls transmission of information from the infrared data transmission unit,
The infrared data transmission control unit is configured to include a unit for detecting that the infrared transmission operation is permitted, and a unit for reading and transmitting information for a predetermined length.

[0010] When the power supply to the radio unit is cut off, it is preferable that the infrared transmission operation is permitted.

Further, it is preferable that the infrared data transmission control unit disables the infrared transmission operation a predetermined time before the start of power supply to the wireless unit.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a radio selective calling receiver according to the present invention. In this figure, an antenna 1 is connected to a radio unit 2, which is connected to a decoder 8 via a waveform shaping circuit 3. A clock oscillator 9 for inputting a clock signal and generating various timings is connected to the decoder 8. The decoder 8 is connected to an LED circuit 4 for turning on a light emitting diode (LED) to make a call notification, and a speaker drive circuit 5 for making a speaker 6 ring and making a call notification.

A system bus 1 is connected between a CPU (Central Processing Unit) 10 and a decoder 8.
1 and a control signal line 17 for transmitting and receiving an infrared data transmission control signal. 2 and 3 show functional block diagrams of the main parts of the decoder 8 and the CPU 10. FIG.

An EEPROM (Electrically Eraseable Programmable Read Only Memory) 12 in which its own call number is stored is stored in a system bus 11.
A ROM (Read Only Memory) 13 in which a program for processing by the CPU 10 is stored;
A RAM (random access memory) 14 for temporarily storing data and various variables generated during the process of U10 is connected. Further, the system bus 11 has RA
A parallel-to-serial conversion circuit (SIO) 19 that converts parallel data stored in M14 into serial data and supplies the serial data to an infrared interface transmission unit 20 (hereinafter, referred to as an infrared I / F transmission unit) is connected. Here, the infrared I / F transmission unit 20 corresponds to the infrared data transmission unit, and includes a driving circuit and an infrared light emitting element.

An externally operated infrared data transmission switch 15 is connected to the CPU 10. A boost circuit 23 for boosting the voltage of a primary power supply 22 such as a dry battery supplies a control circuit 18 such as a CPU 10 or a decoder 8.
Then, the boosted DC power is supplied to the data external output unit 21 including the SIO 19 and the infrared I / F transmission unit 20.
Further, the primary power supply 22 is supplied to a wireless unit / call notification unit 7 including a wireless unit 2, a waveform shaping circuit 3, an LED circuit 4, a speaker driving circuit 5, and the like via a switch 24. A control signal line 16 extending from the decoder 8 is connected to a control terminal of the switch 24, and the switch 24 is opened and closed by a radio unit operation control signal from the decoder 8.

Here, the decoder 8 prevents the operation of the radio unit 2 and the operation of the infrared I / F transmission unit 20 from overlapping,
The control unit is configured to stop the operation of the infrared I / F transmission unit 20 a predetermined time before the operation of the wireless unit 2 starts. Further, the CPU 10 performs control to read out the reception information stored in the RAM 14 and transmit the information to the infrared I / F transmission unit 20 or to transmit the infrared I / F transmission according to the error rate of the data received by the wireless unit 2. An operation for changing the timing at which the transmission operation of unit 20 is stopped is performed.

Next, the operation of the thus-configured radio selective calling receiver will be described. The radio signal received by the antenna 1 is amplified and demodulated by the radio unit 2 and then shaped by the waveform shaping circuit 3 into a readable waveform by the decoder 8. The decoder 8 compares the calling number in the signal from the waveform shaping circuit 3 with its own calling number written in the EEPROM 12 in advance, and when they match, a message signal and data following the calling number To CP
Output to U10.

The CPU 10 performs processing such as error detection and error correction on the message signal and data.
It outputs a notification signal to inform the decoder 8 that there is a call. In response to the report signal from the CPU 10, the decoder 8 outputs a sound signal to the speaker drive circuit 5 to sound the speaker, and sends a drive signal to the LED circuit 4 to turn on the LED.

When the CPU 10 receives the data of the calling number and the message signal from the decoder 8, the RAM 1
4 for storage. The data and the message signal stored in the RAM 14 wait until they are output to the outside by infrared data transmission. Now, when the infrared data transmission switch 15 is pressed by an external operation, the CPU 1
0 indicates that an infrared data transmission request has been received. At this point, the data and message information stored in the RAM 14 are output to the SIO 19. In SIO19, RAM
The parallel data from 14 is converted into serial data and supplied to the infrared I / F transmission unit 20. As a result, data is output from the infrared I / F transmission unit 20 to an external terminal or the like by infrared rays. The above is the normal operation.

Next, by stopping the infrared data transmission operation during the reception operation of the wireless unit, the wireless unit 2 and the infrared I
A control method for preventing both the / F transmission units 20 from operating simultaneously will be described. FIG. 4A shows a batch stream of a signal format according to the POCSAG method as an example. FIG. 3B shows a radio unit operation control signal sent from the decoder 8 to the switch 24. This control signal is generated by a radio section operation control signal generation section 8c in the decoder 8.
This control signal indicates that the switch 24 is closed when the signal is high “H” and the switch 24 is opened when the signal is low “L”.
During the period “H”, power is supplied to the radio unit / call notification unit 7 to operate the radio unit 2, and during the period “L”, the operation of the radio unit 2 is stopped by shutting down the power.

By such an intermittent operation of the radio section 2, the decoder 8 searches for a POCSAG signal. When the decoder 8 detects a preamble (leading bit string) in the POCSAG signal transmitted from the radio unit 2 via the waveform shaping circuit 3, the switch 24 is closed to turn on the power of the radio unit 2 intermittently. Synchronization signal (SC) in search unit 8a
Search for. Further, after the detection of the synchronization signal, the switch 24 is controlled again to perform the intermittent operation of the radio unit 2, the power of the radio unit 2 is controlled to be turned on again at the transmission timing of the signal for the own device, and Make it possible to receive signals. As described above, the power supply of the radio unit 2 is controlled by the decoder 8.
, So that unnecessary operation of the radio unit 2 is not performed.

While the power of the radio unit 2 is turned off by the decoder 8, infrared data can be transmitted to the outside. FIG. 4C shows a state where the decoder 8 changes the CPU.
10, an infrared data transmission control signal. This control signal is generated by an infrared data transmission control signal generating section 8d in the decoder 8. When the control signal is “H”, the infrared transmission operation is permitted, and when the control signal is “L”, the infrared transmission operation is stopped.

Here, the infrared data transmission operation and the radio section 2
The operation switching timing will be described. For a certain period of time after the infrared transmission operation stops transmitting after transmission,
Noise radiation from the booster circuit 23 exists. Therefore, an infrared data transmission control signal is sent from the decoder 8 to the CPU 10 so that the infrared transmission stop is completed a predetermined time T before the start of the operation of the radio unit. The infrared data transmission control unit 10a in the CPU 10 receiving the control signal shown in FIG. 4C controls transmission and stop of data to the infrared I / F transmission unit 20.

FIG. 5 shows a flowchart of an external transmission operation of infrared data based on this control. In this figure, it is assumed that transmission data is stored in the RAM 14 and the infrared data transmission switch 15 is depressed (step S1). At this point, the CPU 10 reads one word of the transmission data from the RAM 14 (step S2), and checks the infrared data transmission control signal from the decoder 8. If the control signal is transmission stop, the process waits until the infrared transmission operation is permitted (step S3). When the infrared transmission operation is permitted (step S3), the CPU 10 transmits one word of data to the infrared I / F transmission unit 2 via the SIO 19.
Send to 0. As a result, data is transmitted from the infrared I / F transmission unit 20 to the outside by infrared rays (Step S).
4). Thereafter, the operations from step S2 to step S4 are repeated, and when there is no more transmission data in the RAM 14 (step S5), the transmission is completed.

By the way, the decoder 8 sets C so that the infrared transmission stop is completed a predetermined time T before the start of the operation of the radio section.
Although the infrared data transmission control signal is transmitted to the PU 10, the wireless communication is changed by changing the time T between the stop of the infrared transmission and the start of the operation of the wireless unit according to the data error condition (data error rate) of the wireless unit 2. The reliability of the receiving operation in the unit 2 can be improved.

Based on this concept, the CPU 10 performs an operation to change the time T in accordance with the data error situation in the radio unit 2 detected by the data error detection unit 8a of the decoder 8. Data error information from the decoder 8 enters the N value determination unit 10b of the CPU 10. In the time T calculating section 10c in the CPU 10, the calculation for changing T is performed by the formula of T = A + B × N. Thus, the value of N can be increased or decreased by the N value determining unit 10b according to the data error situation, and the time of T can be increased by the operation of the operation unit 10c. The value of the determined time T is returned to the decoder 8.

FIG. 6 shows a radio unit 2 and an infrared I / F transmission unit 2
5 shows a flowchart for changing the operation timing of 0. In this figure, a standard time T = A (millisecond) is first prepared as the fixed time T serving as the infrared transmission stop timing (step S1). Initially, data reception is performed with N = 0 (steps S2 to S).
3). If the error of the received data cannot be corrected, the N value determination unit 10b adds 1 to N by the processing in step S4 and uses the increased value of N to calculate unit 10c.
Is performed to determine the time T (Step S)
5). Thus, data reception is performed in step S3 at the timing when the time T is lengthened.

If a data error can be corrected in the received data, the value of N is not changed, and the data is received in step S3 at the timing of time T determined by the calculation in step S5. If there is no data error in the received data and N> 0, 1 is subtracted from N to change the value of N (steps S6 and S7). An operation for determining the time T is performed in step S5 using the reduced value of N,
At the timing of the determined time T, data reception is performed in step S3. As described above, the value of the time T is fixed when the error can be corrected, and when the error disappears, the time T gradually becomes N.
Is reduced, and the value of T is shortened.

[0029]

As described above, according to the present invention, when the radio unit operates, the transmission operation of the infrared data transmission unit is stopped, so that the operation of the radio unit and the operation of transmitting infrared data to the outside overlap. As a result, the influence of noise jumping from the booster circuit to the wireless unit during the infrared transmission operation is eliminated, and deterioration of the receiving sensitivity in the wireless unit can be prevented.

Further, according to the present invention, the transmission operation in the infrared data transmission unit is stopped a predetermined time before the operation of the radio unit is started, so that the influence of noise remaining in the booster circuit after the infrared transmission operation is stopped is reduced. The receiving section does not reach the receiving section, so that the receiving sensitivity of the wireless section can be prevented from deteriorating.

Further, according to the present invention, the decoder controls the intermittent operation of the radio unit and controls the transmission operation of the infrared data transmission unit to be stopped a predetermined time before the start of the operation of the radio unit. Another advantage is that the timing of the operation of the radio unit and the operation of transmitting infrared data to the outside can be easily controlled so as not to overlap.

Further, according to the present invention, the reliability of the reception operation in the radio unit can be improved by changing the transmission stop timing in the infrared data transmission unit according to the error rate of the reception data in the radio unit. There is an advantage.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a radio selective call receiver with an infrared data transmission function according to the present invention.

FIG. 2 is a functional block diagram of a main part of a decoder.

FIG. 3 is a functional block diagram of a main part of a CPU.

FIG. 4 is a timing chart showing a radio unit operation control signal and an infrared data transmission control signal.

FIG. 5 is a flowchart showing an infrared data transmission processing step.

FIG. 6 is a flowchart illustrating a procedure for changing the transmission stop timing of the infrared I / F transmission unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 radio section 3 waveform shaping section 4 LED circuit 5 speaker drive circuit 6 speaker 7 radio section / call notification section 8 decoder 8a data error detection section 8b signal search section 8c radio section operation control signal generation section 8d infrared data transmission control signal Production unit 9 Clock oscillator 10 CPU 10a Infrared data transmission control unit 10b N value determination unit 10c Time T calculation unit 11 System bus 12 EEPROM 13 ROM 14 RAM 15 Infrared data transmission switch 16, 17 Control signal line 18 Control circuit unit 19 Parallel circuit Serial conversion circuit 20 Infrared interface transmission unit 21 Data external output unit 22 Primary power supply 23 Boost circuit 24 Switch

Claims (3)

[Claims] A wireless unit; a memory for storing information; an infrared data transmission unit for outputting the information to the outside by infrared rays; and an infrared data transmission control unit for controlling transmission of the information from the infrared data transmission unit. A wireless selective call receiver, comprising: means for detecting that infrared transmission operation is permitted; and means for reading and transmitting the information for a predetermined length. . 2. The radio selective calling receiver according to claim 1, wherein the infrared transmission operation is permitted when power supply to the radio unit is cut off. 3. The radio selective call receiver according to claim 2, wherein the infrared data transmission control unit disables the infrared transmission operation a predetermined time before the start of power supply to the wireless unit.