KR0165095B1 - Analog pogsag signal analizer and method of the same in wireless paging receiver - Google Patents

Abstract

The present invention relates to an apparatus and method for analyzing an analog POCSAG signal received by a radio call receiver, and more particularly, to analog reclamation of a radio call receiver for more accurately reproducing analog input signal input by wire or wirelessly. A signal analyzing apparatus and method.

That is, an object of the present invention is to provide an analog breadth signal analyzing apparatus for converting an analog signal received by being modulated into a digital bit stream and analyzing it according to software to reproduce an accurate breadth signal.

Accordingly, by demodulating the modulated analog ground signal received at the radio call receiver and sampling the received data converted into the digital bit stream according to software, it is possible to reproduce the accurate ground signal and minimize communication error.

Description

Analog Signaling Signal Analysis Apparatus and Method for Wireless Call Receiver

1 is a block diagram of an analog Ack signal analysis device of the wireless call receiver according to the present invention.

2 is an operational flow diagram for a carrier sensing routine in accordance with the present invention.

3 is an operational flow diagram for a counter interrupt routine according to the present invention.

4 is a flowchart of an operation for a timer interrupt routine according to the present invention.

* Explanation of symbols for main parts of the drawings

10: buffer unit 20: signal amplification unit

30: demodulation part 40: microprocessor

50: memory

The present invention relates to an apparatus and method for analyzing an analog POCSAG signal received by a radio call receiver, and more particularly, to analog reclamation of a radio call receiver for more accurately reproducing analog input signal input by wire or wirelessly. A signal analyzing apparatus and method.

The analog detonation signal received by the paging receiver is deformed by the influence of noise or waveform distortion that infiltrates the transmission path during transmission, resulting in an error in the paging. Therefore, to accurately reproduce the received signal, it is necessary to analyze and reconstruct it.

In general, the analog breadth signal is a kind of a wireless call signal system, and is composed of one preamble and a subsequent codeword group. The preamble is composed of at least 576 bits to prepare the radio page receiver to synchronize first. The codeword group starts with a synchronous code word, and includes a plurality of code words, namely, an address code word, a message code word, and an idle code word. It is composed of In addition, the structure of the codeword group is composed of a sync codeword having one codeword and the following eight frames, each frame has two codewords, and one codeword is composed of 32 bits. do. Accordingly, the codeword group consists of 17 codewords, that is, 544 bits. On the other hand, a plurality of frames are divided into eight numbers, each of which is called one of eight frames (0-7) according to the three least significant bits (LSB) state of the 21 identification bits. do.

In addition, each wireless call receiver based on the conventional digging signal method is assigned seven numbers called capcodes from the wireless calling service provider on the system according to the provision of the digging protocol. That is, the radio call receiver recognizes an address coming into the cap code and notifies the subscriber when the address is received.

At this time, the conventional analog signal as described above is a noise and waveform distortion on the transmission path during the transmission, the reproduction of the signal at the receiving side includes the noise as part of the signal to reproduce the received signal can not be accurately reproduced.

As described above, when a wireless call receiver is called using a conventional analog signal signal, it is impossible to correct distortion of a signal due to noise or waveform distortion occurring on a wireless transmission path, thereby accurately reproducing the received signal. The problem arises.

Disclosure of Invention The present invention has been made in view of the above problems, and an object thereof is to provide an analog breadth signal analyzing apparatus for converting a modulated and received analog signal into a digital bit stream and analyzing it according to software to reproduce an accurate breadth signal. have.

In order to achieve the above object, the present invention includes a buffer unit for removing and outputting harmonic components in buffering the analog signal input from the dedicated line; A signal amplifier for filtering and outputting the waveform distortion of the signal applied from the buffer unit and amplifying the gain in the op amp by a variable resistor; By demodulating the analog signal applied from the signal amplifying unit, extracting the binning signal and outputting the binarized reception data RXD, the carrier detection signal CD is generated when the signal level and frequency of the input signal are above a certain level. A demodulator for generating and outputting the demodulator; A microprocessor for sampling the received data RXD input from the demodulator at predetermined time intervals when the carrier detection signal CD is applied from the demodulator and analyzing the breadth signal; And a memory unit for storing software for detecting a control signal applied from the microprocessor and analyzing the breadth signal.

In addition, to achieve the above object, the present invention provides a method for analyzing an analog signal of a radio call receiver, comprising: a first step of operating a counter when a carrier detection signal (CD) is applied; Generating a interrupt based on a counting result of the counter to operate a timer according to a bit transition of the carrier detection signal CD; And a third process of sampling the received data RXD for a predetermined time and analyzing each signal configuration in comparison with a reference byte in order of the configuration of each codeword of the breadth signal.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

FIG. 1 is a configuration diagram of an analog Bock signal analyzing apparatus for a wireless call receiver according to the present invention. Hereinafter, the accompanying drawings are operational flowcharts of software stored in a memory unit shown in FIG. 1, and FIG. FIG. 3 is an operational flowchart for the counter interrupt routine, and FIG. 4 is an operational flowchart for the timer interrupt routine.

Analogue digging signal analysis apparatus of the wireless call receiver according to the present invention is a buffer unit 10, a signal amplifier 20, a demodulator 30, a microprocessor 40 and a memory unit as shown in FIG. 50 is provided.

The buffer unit 10 is for removing harmonic components included in the received analog signal. The buffer unit 10 removes harmonic components and buffers the analog signal applied from the dedicated line, and applies them to the signal amplifier 20.

The signal amplification unit 20 filters and amplifies the input analog signal, removes the waveform distortion of the signal applied from the buffer unit 10, amplifies it in the op amp and applies it to the demodulator 30. At this time, it amplifies to the desired gain according to the resistance value of the variable resistor connected to the off-amp.

The demodulator 30 demodulates an analog signal applied from the signal amplifying unit 20 to extract a breadth signal and converts the digital signal into a digital bit stream that is easily decoded. The analog applied from the signal amplifying unit 20 is applied. Demodulating the signal and extracting the breadth signal to convert it into received data (RXD; Received Data) of the binarized digital bit stream and at the same time the signal level and frequency of the inputted breadth signal are above a certain level, the carrier detection signal (CD; Carrier Detect) is generated and output to the microprocessor 40, respectively.

The microprocessor 40 controls the sampling by operating the counter and timer according to the software stored in the memory unit 50 by sampling the reception data RXD. That is, when there is a carrier detection signal CD applied from the demodulation unit 30 by the software stored in the memory unit 50, sampling the received data RXD while operating a counter and a timer at predetermined time intervals. The sampling process is performed until the carrier detection signal CD is no longer applied from the demodulator 30.

The memory unit 50 stores software for analyzing and reconstructing the configuration of the received signal by operating the counter and the timer of the microprocessor 40 in a predetermined order.

The analog breadth signal analyzing apparatus of the present invention operates as follows.

First, when an analog signal including an explosion signal is received through a dedicated line in the wireless call receiver, the buffer unit 10 removes harmonic components of the received analog signal and outputs the harmonic component to the signal amplifying unit 20. That is, the buffer unit 10 has a function of a low pass filter and removes unnecessary harmonics.

On the other hand, the signal amplification unit 20 receives the signal filtered by the buffer unit 10 removes the distortion, that is, distortion of the signal waveform and at the same time amplifies with a desired gain and outputs to the demodulator 30. At this time, the gain value amplified by the signal amplifier 20 is adjusted according to the resistance value of the variable resistor connected to the op amp.

Subsequently, the demodulator 30 demodulates the analog signal filtered and amplified by the signal amplification unit 20, converts the analog signal into a digital bit stream, generates a carrier detection signal CD, and applies it to the microprocessor 40, respectively. . At this time, the digital bit stream is output to the microprocessor 40 as reception data RXD. In addition, the carrier detection signal CD is generated when the level and frequency of the received signal are above a certain level, whereby the microprocessor 40 can determine the presence or absence of the detonation signal received.

When the carrier detection signal CD is applied from the demodulator 30, the microprocessor 40 recognizes that the carrier detection signal CD is applied and operates a counter and a timer. Accordingly, the microprocessor 40 samples the reception data RXD at regular time intervals. In this case, the sampling operation starts sampling when the carrier sensing signal CD generated by the demodulator 30 is present, and the start and repetition time of sampling are determined according to the bit transition of the carrier sensing signal CD.

On the other hand, the microprocessor 40 performs sampling by operating a counter and a timer in accordance with software stored in the memory unit 50. At this time, the software detects the presence or absence of a carrier detection signal to operate a counter, a counter interrupt routine to operate a timer according to the bit transition of the carrier detection signal, and a sample of received data when a byte is configured. After the bit cycles through, the preamble, sync code word, frame, sync code word are compared with the reference byte. It consists of a timer interrupt routine that analyzes the digging signal in order.

Detailed operations on this are first performed in accordance with the carrier sensing routine as shown in FIG. The microprocessor 40 checks the presence or absence of the applied carrier detection signal CD (step Sl), and counts the carrier detection signal CD generated by operating the counter if the carrier detection signal CD exists. Step S2 ~ S3). Counting is repeatedly performed until the counting result reaches the set number of counts. If the counting result is reached, a counter interrupt occurs (steps S4 to S5).

If there is no carrier sense signal CD in step S1, i.e., if the bit remains low, it is checked if there is a carrier sense signal CD for the previously received breading signal (step S6). By stopping the operation of the counter (step S7) and limiting the occurrence of the timer / counter interrupt (step S8), it completes without performing a software algorithm.

On the other hand, the count interrupt routine is executed after step S5. If the bit transition of the carrier detection signal CD is rising edge (step T1), it is recognized as a preamble (step T2) and after setting the timer value (step T3), The timer is started (step T4). At this time, the timer value to be set is preferably 833/3 ms. In addition, if the bit transition of the carrier detection signal CD does not occur in step T1, the next step is performed without recognizing the preamble. On the other hand, while performing step T3, the value of the next counter to be programmed is programmed (step T5), and the value of the operated timer is compared with the set 833/3 mu m (step T6). At this time, if the timer value is before 833/3 ms, the counter interrupt routine is repeated, and after 833/3 ms, a timer overflow occurs (step T7) and a timer interrupt is performed (step T8).

When the timer value is 833 ms after the step T8 (step E1), the reception data RXD applied from the demodulator 30 is sampled to read the bit polarity (step E2). In addition, the sampled bits are circulated to form one byte (step E3), in order to easily compare the bytes corresponding to the respective configurations of the received widening signal with the reference byte.

On the other hand, it is checked whether the received data RXD sampled after the step E3 is a preamble, and if the preamble is compared with the reference byte of the preamble (steps E4 to E5), the generated preamble signal is counted up to count the result. After checking whether it is 576 bits, that is, 72 bytes (steps E6 to E7), if it is 72 bytes, it is recognized that it is a synchronization code word located after the preamble of the breadth signal (step E8).

In step E4, if the received data RXD is not a preamble, it is checked whether it is a sync codeword, and if it is a sync code word, it is compared with a reference byte of the sync code word (steps E9 to E10). After counting up and confirming that the counting result is 32 bits, i.e., 4 bytes (steps E11 to E12), if it is 4 bytes, it is recognized that the frame is located after the synchronization code word of the breading signal (step E8).

Also, in step E9, if the received data RXD is not a sync codeword, it is checked whether the frame is a frame, and if it is a frame, it is compared with a reference byte of the frame (steps E14 to E15), and then the generated frame signal is counted up and counted. After checking whether the result is 512 bits, that is, 64 bytes (steps E16 to E17), if it is 64 bytes, it is recognized that the synchronization codeword is located after the frame of the blank signal (step E18).

As a result, the reception data RXD is sampled by the microprocessor 40 by the timer interrupt routine as described above, and each code word of the explosion signal is sequentially analyzed.

According to the present invention as described above, by demodulating the modulated analog input signal received by the pager by sampling and analyzing the received data converted into a digital bit stream according to the software, reproduces the accurate input signal signal to analyze the communication error It can be minimized.

Claims (6)

A buffer unit 10 for removing and outputting harmonic components while buffering an analog signal input from a dedicated line; A signal amplifier 20 for filtering and outputting waveform distortion of a signal applied from the buffer unit 10 and amplifying a gain in an op amp by a light resistance; Carrier detection signal when the signal level and frequency of the input signal is more than a predetermined level while demodulating the analog signal applied from the signal amplifying unit 20 to extract the binarized signal and output the binarized reception data RXD. A demodulator 30 for generating and outputting (CD); When the carrier detection signal CD is applied from the demodulator 30, the microprocessor 40 samples the received data RXD input from the demodulator 30 at predetermined time intervals and analyzes the breading signal. Wow; And a memory unit (50) for storing a software for sensing a control signal applied from the microprocessor (40) and analyzing the digging signal. 2. The apparatus of claim 1, wherein the microprogram control unit (40) comprises: a counter operated by a software algorithm of the memory unit (50) according to the presence or absence of a carrier detection signal (CD) applied from the demodulation unit (30); And a timer operated by a software algorithm of the memory unit (50) according to the bit transition state of the carrier detection signal (CD). 10. A method of analyzing an analog signal signal of a wireless call receiver, comprising: a first step of operating a counter when a carrier detection signal (CD) is applied; Generating a interrupt based on a counting result of the counter to operate a timer according to a bit transition of the carrier detection signal CD; And a third process of sampling the received data (RXD) for a predetermined time and analyzing the configuration of each signal configuration by comparing the reference byte with the configuration order of each codeword of the digging signal. Analog Digger Signal Analysis Method. 4. The method of claim 3, wherein the first process comprises: a first step of counting a carrier detection signal by operating a counter when a carrier detection signal is applied; Counting until the counting result reaches a set count, and counting interrupt occurs when the counting result reaches the set count number; If there is no carrier detection signal generated in the first step, it is determined whether there is a carrier detection signal generated when there is an analog signal previously received, and if there is a carrier detection signal, the operation of the timer / counter is stopped, and the timer / And a third step of limiting the occurrence of the counter interrupt. 4. The method of claim 3, wherein the second process includes: a first step of checking whether a bit of the carrier detection signal is a rising edge after the second step of the first process, and recognizing that the bit is a preamble of the detonation signal if the rising edge is detected; A second step of performing a next operation without recognizing the preamble when the bit of the carrier detection signal does not transition in the first step; A third step of setting a timer to a predetermined time and comparing the predetermined time to a predetermined time set by operating the timer simultaneously with the first step; A fourth step of repeating the interrupt routine when the timer value is earlier than the predetermined time set in the third step; And a fifth step of generating a timer overflow when a timer value is set after the predetermined time set in the third step, thereby generating a timer interrupt. 4. The method of claim 3, wherein the third process samples the received data RXD when the timer value is 833 ms after the fifth step of the second process, determines the polarity of the bits, and configures one byte by cycling these bits. A first step of doing; After the first step, it is determined whether the received data RXD is a predetermined code word of the dicing signal, and compared with a reference byte of the corresponding code word. Comparing a with a reference byte of a predetermined code word; A third step of recognizing a code word after the digging signal after the second step; And a fourth step of sequentially performing the second and third steps of each code word of the roughing signal.