JP3162965B2 - Receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable device such as a pager for receiving a message transmitted from a base station via a radio channel, notifying a user of the reception of the message, and displaying the received message. And a receiving device such as an FM multiplex receiving device.

[0002]

2. Description of the Related Art Today, a portable radio paging device such as a pager which receives a message transmitted from a base station via a radio channel, notifies a user of the reception of the message, and displays the received message. Is widespread. Generally, such a paging device has an internal SR
Equipped with memory such as AM (static RAM),
A function is provided for temporarily storing the received message in the memory, and thereafter displaying the received message in accordance with a user's instruction. In China, Hong Kong, etc., information providing text information such as weather forecast, traffic information, television program guide, etc. to the subscriber's radio paging device using such a function of the radio paging device. Provided services are being provided. The radio pager receives such various kinds of character information as a variable-length message.

For this reason, some of the messages received by the radio pager have long data lengths depending on the contents. However, since a message is transmitted serially one character at a time, the longer the data length of the transmitted message, the higher the possibility that a transmission error of the message due to a change in the radio wave condition occurs during transmission of one message.

[0004] Generally, the messages include messages that are always transmitted in the same sentence pattern. For this reason, a character string representing a common part in a message that is always transmitted in the same sentence pattern, for example, "Waiting at."
A character string representing "Please go home." Is predetermined as a "fixed sentence". This fixed phrase is represented by an unused character code in the message. An unused character code is a character code other than a character code (hereinafter, referred to as a “normal character”) for which a code is already assigned according to an existing standard such as a JIS code or a Chinese code. This allows
The more boilerplate messages you have, the more
The larger the difference between the number of characters in the original character string of the fixed phrase and the number of characters in the corresponding character code, the shorter the length of the message transmitted between the base station and the radio pager can be, Transmission efficiency can be improved.

Therefore, the radio pager serially receives a message in which normal characters and character codes representing fixed phrases are mixed, and converts the character code in the received message into
Each time one message is received, it is stored in the memory in real time, and after the reception is completed, the message is read out from the memory and displayed. Further, as described above, since the paging device receives a variable-length message, the received message includes one of the displayed contents.
Also includes items that cannot be displayed in the number of times. in this case,
The radio paging device displays the contents of a display screen (hereinafter, referred to as a display screen 1) in response to a user's instruction or at regular time intervals.
The displayed contents of the times are called "pages". ), One message is displayed.

Hereinafter, a specific message display operation of the conventional paging apparatus will be described. FIG. 5 is an explanatory diagram showing a message decoding method in a conventional radio pager. FIG. 5A shows a received message (hereinafter, referred to as “message”).
"Received message". ) Shows the storage state. FIG.
(B) shows a correspondence table in which a character code representing a fixed phrase and its expanded text are associated with each other. In FIG. 5B,
“O”, “Δ”, and “□” indicate character codes representing different fixed phrases, and “×” indicates one ordinary character. FIG. 5C shows an expanded sentence read from the correspondence table corresponding to a character code representing a fixed sentence. FIG. 5 (d)
Indicates display data created from the message in FIG.

As shown in FIG. 5A, the memory (S
In the (RAM), the message is stored in the form of a mixture of ordinary characters and character codes representing fixed phrases. When displaying a message, a microcomputer (hereinafter referred to as a “microcomputer”) in the radio paging apparatus performs an SRA.
From M, the character codes of the number of characters to be displayed are read out one by one from the message. The microcomputer stores the number of characters read from the beginning of the message in a page pointer in the microcomputer.

Further, the microcomputer is provided with a display data memory as shown in FIG. 5D for storing display data for the number of characters to be displayed. The microcomputer determines whether the read character code is a normal character or a character code representing a fixed phrase, and if it is a normal character, creates display data corresponding to the character code and stores the display data in the display data memory. Write to. If it is a character code representing a fixed phrase, it is the original character string of the fixed phrase corresponding to the character code from the correspondence table shown in FIG. The expanded sentence stored in characters is read out and written in a fixed sentence memory in the microcomputer shown in FIG. 5C, which is a memory different from the display data memory.

If there is display data already written in the display data memory, the microcomputer subtracts the number of characters of the display data already written in the display data memory from the number of characters to be displayed, and obtains the remaining data. A character string is read from the head of the fixed phrase memory by the number of characters, display data is created, and written in the display data memory. When one page of display data is written to the display data memory, that page is displayed.

When the microcomputer reads out a part of the expanded sentence in the fixed sentence memory, the number of characters from the beginning is read and stored in a fixed sentence pointer in the microcomputer. Here, when the page up key instructing the next page to be turned forward (in the forward direction) is pressed, the microcomputer reads the next character string from the expanded sentence in the fixed sentence memory and reads the display data. Create and write in display data memory. When the microcomputer reads all the character strings of the expanded sentence in the fixed sentence memory, the microcomputer resets the fixed sentence memory and the fixed sentence pointer. At this point, if one page of display data has not been written to the display data memory, the microcomputer reads the next character code from the SRAM. Hereinafter, each time the page up key is depressed, the display contents of the message are sequentially paged and displayed, and all pages of the message are displayed.
Further, when a page down key for instructing page feed display in the reverse direction is pressed while a certain page in the message is displayed, the microcomputer reads the page pointer, the fixed phrase memory, and the fixed phrase text. After resetting the pointer, the first page of the message is displayed by the above procedure.

Thus, for example, a certain message is 3
In the case of the page length, each time the user presses the page up key, the display content of the message is sequentially displayed in the order of first page → second page → third page. On the other hand, if the user presses the page down key while the third page of the message is displayed, for example, the third page is displayed to the first page. That is, the radio pager sequentially displays the next page when the page up key is pressed, but does not display the previous page when the page down key is pressed, but displays the next page instead. Display the first page of the message.
The reason that the previous page is not displayed when the page down key is pressed is that the character code representing the fixed phrase in the message must be expanded each time the message is displayed. This is because the procedure becomes more complicated than the processing procedure of displaying the page in the forward direction. In other words, even if a fixed phrase pointer is provided, since the length of each fixed phrase varies, it is difficult to simply indicate the number of characters from the end of the fixed phrase by an address in the fixed phrase memory, and This is because the length of the fixed phrase cannot be determined unless the fixed phrase is read from the correspondence table.

[0012]

However, as described above, some of the messages received by the radio pager have a relatively long display content of, for example, about 10 pages, depending on the content. . When the user views such a relatively long display content, particularly when trying to see the latter half of the message back to the previous page, pressing the page down key causes the message to be displayed on the first page at once. When you return,
The user must press the page-up key many times to reach a desired page, which is troublesome and troublesome. For example, when the user wants to see the ninth page while the tenth page of the message is displayed, the first page is displayed on the radio pager by pressing the page down key. rear,
Then, by pressing the page up key, the pages must be sequentially switched to display the ninth page. In this case, the user presses the page down key once,
The page-up key must be pressed eight times, which is a troublesome operation for the user.

In another general information processing apparatus having a display screen, for example, an electronic organizer, the page up key and the page down key may be depressed only in a different direction of page feed. In many cases, the display contents are used to display the display contents one page at a time. For this reason, in the paging apparatus, performing the page turning operation in which the page up key and the page down key are different from each other does not match the user's feeling, and in combination with the above-described problem, the page having the desired display content for the user There is a problem that the operation of searching for is very troublesome, and gives an impression that the wireless paging device is difficult to handle.

Further, in the conventional paging apparatus, a fixed phrase is developed at the time of display. Therefore, even if the page is turned in the forward direction, the above complicated processing procedure must be performed every time the page is turned. In addition, there is a problem that the load on the microcomputer at the time of display increases. The present invention has been made in view of the above problems, and even when a variable-length message including a fixed phrase is received, the received message is displayed in a simpler processing procedure, and the user's key operation and It is an object of the present invention to provide a radio pager in which a corresponding page turning display is performed without a sense of incongruity for a user, and the user can easily confirm a desired page.

[0015]

According to a first aspect of the present invention, there is provided a radio pager, comprising: a correspondence between a character code string constituting a fixed phrase and a fixed character code representing the fixed phrase; Table storing means for storing a correspondence table indicating a message, a message storing means having a storage area for storing a message, and a message received as a character code string in which fixed-form character codes are mixed is stored as it is. First writing means for writing to the means, reading means for sequentially reading all the character codes in the message written by the first writing means one by one, and searching the correspondence table for the read character codes, Determining means for determining whether the read character code is a fixed phrase character code, and as a result of the determination, the read character code is a fixed phrase character If it is the same message, the character code string corresponding to the fixed-form character code in the correspondence table is stored in the predetermined free storage area in the message storage means, otherwise, the read character code is left as it is. A second writing unit that continuously writes in the order in which the messages are read, an address storage unit that stores a head address in a message written by the second writing unit,
A forward page feed instruction input means for receiving an input of a content for instructing page feed display on the next page, and an address in the address storage means in accordance with an input from the forward page feed instruction input means. A first address updating means for updating to an address, a reverse page feed instruction input means for receiving an input of a content for instructing page feed display on a previous page, and an address in response to an input from the reverse page feed instruction input means. Second address updating means for updating the address in the storage means to the head address of the previous page, page reading means for reading a character code string for one page from the address in the address storage means, and reading by the page reading means Display means for displaying the selected character code string.

According to a second aspect of the present invention, there is provided a radio pager.
The wireless paging apparatus according to claim 1, further comprising: reception completion detection means for detecting completion of reception of the message; and read permission means for permitting the reading means to read after reception completion detection means detects reception completion, The reading means starts reading after obtaining permission from the reading permission means.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

[0018]

FIG. 1 is a block diagram showing the configuration of a radio pager 100 according to an embodiment of the present invention. The radio paging device 100 includes an RF (radio frequency) block 101, a decoder 102, and an EEP (electr).
ical erasable programmable
e) ROM 103, microcomputer 104, SRAM 105,
It includes a mask ROM 106, an LCD (liquid crystal display) driver 107, an LCD module 108, a key matrix 109, an LED (light emitting diode) 110, a vibrator 111, and a buzzer 112. Further, the microcomputer 104 includes a display data memory 113.

The RF block 101 always receives radio information of a predetermined length at fixed time intervals, and outputs the received radio information to the decoder 102. Also, the decoder 102
According to the instruction from the base station, the mobile station receives a variable length message transmitted from the base station following the wireless information and outputs the variable length message to the decoder 102. The decoder 102 identifies from the received wireless information whether or not the information is transmitted to the wireless calling device 100. As a result of the identification,
If the message is addressed to the radio pager 100, it instructs the RF block 101 to continuously receive the subsequent message and outputs an interrupt signal to the microcomputer 104. Subsequently, the decoder 102 sequentially transfers the character code in the message received by the RF block 101 to the microcomputer 104 as serial data. Further, the decoder 102 detects the completion of the reception of the message and notifies the microcomputer 104 of the completion. Also, the decoder 102
If the identification result indicates that the wireless paging apparatus 100 is addressed to the paging apparatus 100, the LED 110, the vibrator 111 and the buzzer 1
12 to notify the reception.

The EEPROM 103 stores set environment data, for example, a timer setting time for relocating a message in the SRAM 105, or a timer setting time for reception notification and a reception notification method corresponding thereto. The microcomputer 104 writes the character code in the message received one character at a time in the SRAM 105 as it is while receiving the message. When receiving the notification of the completion of the reception from the decoder 102, the microcomputer 104 checks each character from the head of the written received message one by one with the correspondence table in the mask ROM 106, and if the collated character code is a normal character, it is left as it is. If it is a character code representing a fixed phrase, it is developed into a character string corresponding to the character code in the correspondence table, and is written in a free storage area following the received message in the SRAM 105. In this way, when all the character codes in the received message are decoded and the decoded message is written in the SRAM 105, the microcomputer 104 changes the control information of the received message, invalidates the received message, and (Hereinafter referred to as a “decryption message”). Hereinafter, the message decoding process of the microcomputer 104 will be described in more detail with reference to FIGS. Further, the microcomputer 104 creates display data for each page by using the decoded message in the SRAM 105, and displays the content of the received message on the LCD module 108 by page. The page turning display process of the microcomputer 104 will be described in more detail below with reference to FIG.

FIG. 2 is an explanatory diagram showing the storage area classification and the storage state of messages in the SRAM 105 of this embodiment. FIG. 2A shows a storage area division in the SRAM 105. FIG. 2B shows the contents of the received message. FIG. 2C shows the contents of the decryption message. FIG.
5 is a flowchart showing a processing procedure in decoding a received message by the microcomputer 104 according to the embodiment.

When the reception of the message is started, the microcomputer 104 converts the character code in the message transferred one character at a time from the decoder 102 together with the interrupt signal into the character code as it is as shown in FIG. ,
The data is sequentially written from the beginning of the free storage area at the end of the data area in the SRAM 105 (step S301, step S301).
302). In response to the reception completion notification from the decoder 102 (step S303), the microcomputer 104 creates control information describing the start address and end address of the received message, writes the control information in the control information area in the SRAM 105, and then writes the control information in the SRAM 105. Start decrypting the received message written in. The microcomputer 104 decodes the received message one character at a time as described below.
As shown in (a), the decryption message is written in a free storage area following the storage area in which the received message is written in the data area of the SRAM 105.

That is, the microcomputer 104 executes the S
The received message written in the RAM 105 is read out one character at a time starting from the first character (step S304), and a correspondence table in the mask ROM 106 is searched (step S305) to determine whether the character code is a character code representing a normal character. It is identified whether the character code is a character code representing a fixed phrase (step S306). As a result of the identification, if the character code represents a fixed phrase, the microcomputer 104
An expansion sentence corresponding to the character code is read from the correspondence table in M106 (step S307), and the SRAM 10
5 (step S30).
8). If it is a character code representing a normal character, it is written into the empty storage area as it is (step S308).

In this way, the microcomputer 104 decodes the received message one character at a time while
A decryption message is created by writing to the free storage area in the storage area. Further, the microcomputer 104
When all the character codes in the received message are decoded and written into the free storage area (step S309), control information such as an address for the decoded message is created and written in the control information area of the SRAM 105, and the control information about the received message is written. By erasing
The received message is invalidated (step S310).

FIG. 4 is a flowchart showing an example of a procedure of a page feed display corresponding to a key operation in the microcomputer 104 of this embodiment. The microcomputer 104
It has a display data memory 113 for storing display data of characters × 2 lines, and an address pointer (not shown) for storing an address in the SRAM 105, and starts displaying the decrypted message after the completion of the decryption message creation.
First, the microcomputer 104 initializes the address in the address pointer to the address immediately before the head of the decryption message (step S401).

Next, if the address in the address pointer is not the end address of the decryption message (step S
402), from the address following the address in the address pointer, read out a character code of 8 characters × 2 lines composed of ordinary characters (step S403), and store the end address of the read character string in the address pointer. (Step S404). The microcomputer 104 creates display data of the read character string, writes the display data in the display data memory 113 (step S405), and after the display data has been written, stores the display data in the LCD driver 1
07. Thereby, the first page of the message is displayed. In step S402, if the address in the address pointer is the end address of the decryption message, the process proceeds to step S406.

At this time, when the page up key is pressed (step S406), the microcomputer 104 returns to the processing of step S402. When the page down key is pressed (step S407), if the address in the address pointer is not the end address of the first page of the decryption message (step S408), the microcomputer 104
The address in the address pointer is returned two pages, that is, eight characters × four lines (step S409), and the process returns to step S402. In step S408, if the address in the address pointer is the end address of the first page of the decryption message, step S406
Return to the processing of.

After a lapse of a predetermined time from the display data creation processing in step S404, the process may proceed to the reading processing in step S402, and the next page may be sequentially displayed at a fixed time interval. The SRAM 105 has a storage capacity of about 32 Kbytes and mainly stores received messages. As shown in FIG.
The storage area of the RAM 105 is divided into a control information area, a work area, and a data area.

In a storage area of about 2 Kbytes from address 80 to address 7FF, which is divided as a control information area, for each valid message stored in a data area to be described later, the start address and end address of the message are stored. Is stored. In a storage area of 6 Kbytes from address 800 to address 1FFF, which is divided as a work area, data generated intermediately in processing such as data processing is temporarily stored. The work area is used as a spare storage area for other processing.

In a storage area of 24 Kbytes from address 2000 to address 7FFF, which is divided as a data area,
The content of the received message is written in message units. The mask ROM 106 stores fixed data set in advance in the radio pager, such as a correspondence table showing the correspondence between a character code representing a standard sentence and a corresponding expanded sentence. The character code representing a fixed phrase is, for example,
The first three bits are represented by a 14-bit 2-byte code starting with “7”.

The LCD driver 107 performs L based on display data transferred from the display data memory 113.
The CD module 108 is driven. LCD module 1
08 is, for example, 128 × 32 dots (8 characters × 2 lines)
Is driven by the LCD driver 107 based on the display data, thereby displaying the name of the called party who called the user of the radio pager, the content of the received message, and the like in characters and figures. I do.

The key matrix 109 inputs an input value according to a user operation. The LED 110 notifies the user of the reception of the message by light. Vibrator 11
1 notifies the user of the reception of the message by vibration. The buzzer 112 notifies the user of the receipt of the message by sound. Note that the microcomputer 104 is an SRAM 105
When accessing the, a high frequency is generated and the microcomputer 1
It is known that a reception error easily occurs in data received by the RF block 101 while the 04 accesses the SRAM 105. For this reason, every time one character of the message being received is received, if the character code is to be decoded and rewritten, a newly received character code is likely to cause a reception error. Not. On the other hand, according to the present embodiment, the radio pager 100
Since the decryption of the message is started after the completion of the reception of the message, the message can be received more accurately without being affected by high frequency noise due to the decryption of the message.

For the same reason as described above, the paging apparatus 100 receives a new message until the microcomputer 104 creates a decryption message from the received message and finishes writing the created decryption message in the SRAM 105. I can't. However, since the time required for decrypting the received message is in the unit of msec, the probability of losing the opportunity to receive a new message due to this is low, and this disadvantage has the following effects obtained as a trade-off relationship. Is negligibly small.

Further, according to the present embodiment, the radio pager 1
In the case of 00, a character code representing a fixed phrase in the received message is expanded in advance and stored in the SRAM 105. This eliminates the need to expand the character code representing a fixed phrase each time it is displayed, and enables the display of a forward page to be displayed in a simpler processing procedure in response to a user's key operation than a conventional wireless paging device. This can reduce the load on the microcomputer 104 at the time of page feed display, and can also perform page feed display in the reverse direction by a simple processing procedure as shown in FIG. In addition, as a result, the user can perform an operation for instructing page-turn display without feeling uncomfortable, and can easily search for desired display content.

Although the above embodiment has been described with respect to an example in which the present invention is applied to a radio paging apparatus, the present invention can be applied to other receiving apparatuses. For example, the present invention can be applied to an FM multiplex receiving apparatus that receives an FM multiplex signal in which a digital signal such as character information is multiplexed on an FM broadcast signal.

[0036]

According to the first aspect of the present invention, a fixed form character code in a message received as a character code string in which fixed form character codes are mixed is converted into a character code string corresponding to a fixed form character string in advance. The message is stored in the message storage means, and the address in the address storage means is updated according to the input from the forward page feed instruction input means and the input from the reverse page feed instruction input means. In both the forward direction and the reverse direction, page turning display can be performed by a simple processing procedure. As a result, the user can operate the forward page feed instruction input means and the backward page feed instruction input means without discomfort while watching the displayed page, and can easily confirm the desired page. Play.

According to the second aspect of the present invention, the reading means starts reading the character code in the message written by the first writing means after the reception completion detecting means detects the reception completion. There is an effect that the message being received can be received more accurately without being adversely affected by the noise generated by the reading unit and the second writing unit accessing the message storage unit.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a radio pager 100 according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing storage area divisions and message storage states in an SRAM 105 of the embodiment.

FIG. 3 is a flowchart showing a processing procedure in decoding a received message by a microcomputer 104 according to the embodiment.

FIG. 4 is a flowchart showing a processing procedure of a page feed display corresponding to a key operation in the microcomputer 104 of the embodiment.

FIG. 5 is an explanatory diagram showing a message decoding method in a conventional radio pager.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Wireless paging device 101 RF block 102 Decoder 103 EEPROM 104 Microcomputer 105 SRAM 106 Mask ROM 107 LCD driver 108 LCD module 109 Key matrix 110 LED 111 Vibrator 112 Buzzer 113 Display data memory

Claims (2)

(57) [Claims] 1. A receiving device for receiving a message from a base station via a wireless channel and displaying the content of the message on a page-by-page basis, comprising: a character code string constituting a fixed phrase; Correspondence table storage means storing a correspondence table indicating correspondence with sentence character codes, message storage means having a storage area for storing messages, and received as a character code string in which fixed form character codes are mixed First writing means for writing the message as it is to the message storage means, reading means for sequentially reading all character codes in the message written by the first writing means one by one, and the correspondence table for the read character codes Determining means for determining whether or not the read character code is a fixed-form character code; and If the output character code is a fixed-form character code, the character code string corresponding to the fixed-form character code in the correspondence table is stored. Second writing means for sequentially writing the same message in the free storage area of the same message in the read order; address storage means for storing the start address in the message written by the second writing means; A forward page feed instruction input means for receiving an input of content for instructing page feed display, and an address in the address storage means is updated to a head address of the next page in response to an input from the forward page feed instruction input means. A first address updating means, and a backward page feed finger for receiving an input of a content for instructing page feed display on the previous page Address input means, second address updating means for updating an address in the address storage means to the head address of the previous page in response to input from the reverse page feed instruction input means, A receiving apparatus comprising: a page reading means for reading a character code string for one page; and a display means for displaying a character code string read by the page reading means. 2. The receiving apparatus according to claim 1, further comprising: reception completion detection means for detecting completion of reception of the message; and reading permission for reading by the reading means after the reception completion detection means detects reception completion. A receiving unit, wherein the reading unit starts reading after obtaining the permission from the reading permitting unit.