JPH0756554Y2 - Selective call signal receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a selective call signal receiver capable of calling with a plurality of selective call numbers, and more particularly to a storage means for storing the selective call numbers.

[Prior Art] Conventional selective call signal receivers are provided in various types of signal formats. However, the basic configuration is the same. This will be described with reference to FIG. This selective call signal is based on the document "STANDARD MESSAGE FORMATS FOR DIGITAL R
ADIO PAGING "(Post Office Code Standardization Ad
vison Group (POCSAG), Autumn, 1980).

One batch is composed of one sync code string and eight frames. Two code strings are contained in one frame.
The selective call signal receivers in this case are classified into eight groups. The receivers in each group receive and process only the selective call code string of a predetermined frame in each batch. For example, the receivers belonging to the third group receive only the selective call signal of the third frame of each batch, and do not receive the other first, second, fourth to eighth frames.

The configuration of each code string will be described with reference to FIG. Each code string in this case is composed of 32 bits. The first 1 bit is called address data bit 401, and whether this code string has the information of the selective call number,
Indicate whether you have the message information. When this bit is 0, it indicates that this code string has information on the selective call number. This address data bit 401
The 20 bits following are the selective call number message bit 402. When address data bit 401 is 0, the 18 bits before this 20 bits are the selective call number,
The last 2 bits are function bits. Selective call number
10 bits following message bit 402 are error detection
Redundant bit 403 for correction. Furthermore, the last 1 bit of each code string is a parity bit for error detection.
It is 404.

On the other hand, the selective call receiver stores a predetermined selective call number using a storage means in each receiver. Each receiver receives the selective call signal of a predetermined frame, and if the address data bit of the code string in the selective call signal is 0, it precedes the succeeding selective call number and message bit by 18 bits. The bit is compared with the selective call number of the receiver stored in the storage means.

The example shown in FIG. 5 is a case where the storage means is a ROM and four selective call numbers are assigned to one receiver. The first selective call number 501 is stored in 18 bits from the address 0000000B (B indicates that this number is a binary number) to 0010001B of the storage means. Similarly, the second selective call number 502 and the third selective call number 5
03 and the fourth selective call number 504 are stored 18 bits each. Address 1001000B to 100101
In the 4-bit setting information bits 506 up to 1B, information indicating which of the first to fourth selective call numbers is valid and which number is not used is written. Addresses 1001100B and above are used for other purposes.

The receiver uses the information of the setting information bit 506 in FIG. 5 to know which one of the first to fourth selective call numbers is actually set and valid, and reads all the selective call numbers. It is compared with the selective call number, message and bit of the code string received and received.

[Problems to be Solved by the Invention] However, in the above-described conventional technique, the storage means that stores a plurality of selective call numbers does not have the maximum number of selectable call numbers that can be set. If it is not used, when the plurality of selective call numbers stored in the storage means are to be compared with the selective call number / message / bit of the code string in the received selective call signal, the storage means is used. The problem is that it is necessary to control so as not to compare the value stored in the unused area with the selective call number, message and bit of the code string in the received selective call signal, and an extra circuit is required. There was a point.

Therefore, the present invention solves such a problem,
The purpose is to compare the plurality of selective call numbers stored in the storage means with the selective call numbers / messages / bits of the code string in the received selective call signal. Even if the maximum number of selectable call numbers that can be set is not set in the storage means in which is stored, a selective call signal receiver that can configure a comparison circuit without considering that is provided. Especially.

[Means for Solving the Problems] The selective call signal receiver of the present invention has a means for storing a plurality of selective call numbers and can be called by the plurality of selective call numbers for receiving and processing the selective call signals. In the wireless receiver, the value of the synchronous code string sent as a part of the selective call signal to the selective call number storage area which is not currently used in the means for storing the plurality of selective call numbers is stored. It is characterized by being stored.

[Operation] According to the above configuration of the present invention, even if the maximum number of selectable call numbers that can be set is not set in the storage means that stores a plurality of select call numbers, the storage means is vacant. Considering that the value of the synchronous code string is stored in the area and the same selective calling number as the synchronous code string is not set in the receiver, the plural selective calling numbers stored in the storage means are stored. When an attempt is made to compare the number with the selective call number / message / bit of the code string in the received selective call signal, the number of selective call numbers stored in the storage means is not taken into consideration, and It does not matter even if all the values of the area reserved for the inner selective calling number are compared with the selective calling number, message and bit.

[Embodiment] FIG. 1 is an address map diagram of a ROM used as a storage means in an embodiment of the present invention. Address 0000000B
18 bits from 1 to 0010001B are the first selected call number 10
It is the area of 1, followed by the second selective call number 102, the third
An area of 18 bits is reserved for each of the selective call number 103 and the fourth selective call number 104. Address 1001
Area 105 after 000B is used for other purposes. Further, in the example of FIG. 1, the same value as the synchronous code sequence is contained in the areas of the third and fourth selective calling numbers, and only the first and second selective calling numbers are assigned to the receiver,
In addition, the case where the fourth selective call number is not set is shown.

FIG. 2 is a block diagram of a main part of the embodiment of the present invention, that is, a selective call number comparison circuit, which comprises a selective call number storage means 201 and a comparison circuit 202. The comparison circuit 202 displays the code string DAT in the received selective call signal.
A and the selective call number IDDT read from the selective call number storage means 201 are input. The comparison circuit 202 compares the selective call number / message / bit in the code string DATA with the selective call number IDDT, and outputs the coincidence signal COINC when they coincide.

In the comparison circuit 202 shown in FIG. 2, from the selective call number storage means 201 to the fourth selective call number from the first selective call number according to the address map diagram of the storage means shown in FIG. Are read out, and the selected call number, message, and bit in the code string DATA are compared in the same manner from the first selected call number to the fourth selected call number. The same value as the synchronous code sequence is stored in the third and fourth selective call number areas of the selective call number storage means, but the synchronous code sequence is not transmitted at the frame position. There is no match in the fourth selective call number.

[Advantages of the Invention] According to the invention as described above, in the wireless receiver capable of calling with a plurality of selective calling numbers, the maximum number that can be set in the storage means for storing the plurality of selective calling numbers. Even if the selective call number is not set, any selective call number in the storage means has the same configuration without considering which selective call number in the storage means is valid and which selective call number is invalid. In this circuit, it can be compared with the selective call number, message and bit in the code string of the received selective call signal. Therefore, whether the selective call number in the storage means is valid or invalid, the selective call number is compared with the selective call number / message / bit in the code string of the received selective call signal is selected. An extra circuit can be omitted.

Further, as shown in FIG. 5, a setting information bit 50 indicating which selective calling number is valid or invalid in the storage means.
Eliminates the need for 6 and can efficiently use storage means.

[Brief description of drawings]

FIG. 1 is an address map diagram of a ROM which is a storage means of an embodiment of the present invention. FIG. 2 is a block diagram of a main part of an embodiment of the present invention, that is, a selective call number comparison circuit. FIG. 3 is a diagram showing a basic signal format of a selective calling signal. FIG. 4 is a diagram showing the configuration of a code string. FIG. 5 is a conventional address map diagram when a ROM is used as a storage means.

Claims (1)

[Scope of utility model registration request] 1. A radio receiver which has means for storing a plurality of selective call numbers and which receives and processes a selective call signal and which can be called by the plurality of selective call numbers, stores the plurality of selective call numbers. A selective calling signal receiver characterized in that the value of the synchronous code string sent as a part of the selective calling signal is stored in a selective calling number storage area which is not currently used among the means for storing. .