JPH04207234A - Multichannel pager - Google Patents

Abstract

PURPOSE:To eliminate a failure of reception due to an artificial miss by using a synchronizing signal collating function and switching back a channel to a preliminarily set specific channel to give an alarm at the time when the the collation impossible state continues for a certain time. CONSTITUTION:A SYNC pattern in a ROM 5 is read out to discriminate whether the signal inputted from an antenna 21 and decoded by a decoder 7 coincides with the SYNC signal or not by a SYNC collating module 1. If a current function selecting flag discriminating module 2 finds that a current function selecting flag is 0, it is regarded that synchronism cannot be acquired, and the frequency in SYNC NG is counted up to a prescribed value by a SYNC NG frequency integrating module 3. When this frequency reaches the prescribed value, the collating module 1 refers to a channel number write bit 4 in the ROM 5 to switch the channel to the preliminarily set specific channel by a channel switching module 6. Simultaneously, the channel change is reported to a user by an alarm means like a speaker 25 or a display part 29.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a multi-channel pager with a frequency changing function used in areas where a plurality of reception areas coexist.

2. Description of the Related Art Conventionally, this type of multi-channel pager has a plurality of receiving channels (frequencies) (fl.

f2), but the switching is done manually using a switch. In FIG. 3, it is assumed that the pager user is currently in an area where only f1 can be received. The pager user moves to area 12 and f 2
It is assumed that the channel (hereinafter referred to as ch2) that can receive only After that, assume that the user leaves the area f2 again. At that time, in the conventional multi-channel pager, the user had to manually reset the channel to a channel (hereinafter referred to as ch+) that can receive data from ch2 (f2) to f].

FIG. 4 shows a block diagram of the pager. The antenna 21 tunes the receiving frequency, and the receiving section 22 and local oscillation circuit 23 convert the receiving frequency to an intermediate frequency. Waveform shaping section 2
The signal demodulated in step 4 is checked in the decoder 25 with the code in the ROM 28 in which the calling number is stored, and if they match, the user is notified of the reception by a sound from the speaker 25 or the like.

In a conventional multi-channel pager, a push switch (PUSHSW) 27 is used for channel switching. FIG. 5 shows a conventional switching operation flow. After turning on the power, the currently receivable channels are displayed on the LCD (3
1). When the switch 27 is pushed, a message is displayed on the display section 29 (32). After the message display ends, the state shifts to the channel setting state (33). In the channel setting state, the pager user pushes the switch 27 again to set the desired channel (34).

Problems to be Solved by the Invention However, in the conventional pager described above, the receiving channel (
Since switching between receiving frequencies (receiving frequency) is performed by operating a switch, even if there is a pager user between receiving areas (fQ in FIG. 3), the user may forget to switch channels and receive no reception.

The present invention solves these conventional problems,
The purpose of the present invention is to provide a multichannel pager that eliminates the state of not receiving data due to human error.

Means for Solving the Problems In order to achieve the above object, the present invention provides a 5YNC pager.
(Synchronization signal) Use the verification function. S)' NC verification function is a function for synchronizing with the 5YNC code included in the signal sent from the base station. If the NG (impossible) state in which 5YNC verification cannot be performed continues for a certain period of time, the current channel number is forcibly returned to a preset specific channel and a warning is issued with a sound or the like. Further, a flag for this function is provided on the ROM map so that this function can be selected.

Effect: Therefore, by the automatic change of the reception channel according to the invention,
This has the effect of preventing a situation in which reception is not possible within a receivable area and preventing human error.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention, and FIG. 2 shows its operation flow. In Figure 1, 1 is a 5YNC (synchronization signal) verification module, 2 and 3 are a function selection flag discrimination module and a 5YNCNG frequency accumulation module provided inside the 5YNC verification module 1, and 4 is an R
Channel number write bit provided inside OM5, 6
7 is a channel switching module, and 7 is a decoder. The same reference numerals as in other FIG. 4 indicate the same names.

The operation of the above configuration will be explained with reference to FIG. At power on (POWER0N) 40, the 5YNC matching module 1 checks whether the signal input from the antenna 21 and decoded by the decoder 7 matches the 5YNC signal.
Read out the 5YNC pattern of M5. (41)
, if the 5YNC verification with the received signal is established (OK), this state is maintained, and then the calling number is verified and the speaker 25
, and the display unit 29 displays a message.

On the other hand, this function selection flag determination module 2 determines whether this function selection flag is set (in the case of 1), and if it is set, the current channel is maintained, and if necessary, the button can be manually pressed as before. Channel switching is performed by switch 27 (42). If the flag is O, it is assumed that synchronization could not be achieved, and 5YNC is performed up to the specified number of times.
The number of NGs is counted by the 5YNCNG number integration module 3 (43). When the number of NGs reaches a predetermined value, 5YN
The C verification module 1 refers to the channel number write bit 4 of the ROM 5 and switches to a specific channel preset by the channel switching module 6 (44).

Also, at the same time as channel switching, the speaker 25 and display unit 2
The alarm means 9 notifies the user of the channel change.

Therefore, in FIG. 3, if ch+ is set as the specific channel, when the user returns from the Ch2 area to the ch+ area, the user will automatically return to ch+. In addition, ch+
The change from Ch2 to Ch2 can be made by the bush switch 27 as before.

Furthermore, in the above description, an example has been shown in which the 5YNC collation module 1 is provided separately from the decoder 7, but they may be formed integrally. It is also possible to replace the functions of the decoder 7 and the like with a CPU.

Effects of the Invention As is clear from the above embodiments, the present invention has the following effects.

(1) Since the channel is automatically changed (feedback), it is possible to prevent a situation where no reception occurs due to forgetting to change the channel.

(2) If you add a flag for frequency change function selection,
゛It can also be used as a conventional veneer.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a multi-channel pager in an embodiment of the present invention, FIG. 2 is a flow diagram for explaining the operation of the pager, and FIG. 3 is an explanation showing the relationship between the pager reception areas. 4 are block diagrams showing the configuration of the conventional example, and FIG. 5 is a flow diagram showing the operation of the conventional example. 1...5 YNC verification module, 2...This function selection flag discrimination module, 3...5YNCNG frequency integration module, 4...Channel NO write bit, 5...
...ROM, 6...Channel switching module, 7...
・Decoder, 25...Speaker, 27...Bunyusuinochi. Figure 2 Figure 6 □ Base station Figure 4 Figure 5 ■ 42 seconds or more

Claims (1)

[Claims] A pager that can switch between multiple channels to receive and decode.
a collation means for performing synchronization verification of the received signal on the set channel; an integration means for counting the number of times when the synchronization signal is not verified; and when the number of integrations reaches a predetermined value, the set channel A multi-channel pager comprising channel switching means for switching to a specific channel stored in advance, and alarm means for warning of the channel switching.