JPH048971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an individual selective calling receiver that receives a digitally encoded calling information signal consisting of a receiver calling number and a message signal. In particular, the present invention relates to an individual selective calling receiver that stores message signals.

Conventionally, in this type of individual selective calling receiver, the transmitting base station repeatedly makes the same call (same calling number and same message signal) for the purpose of increasing the receiving rate on the receiver side. Repeat calls may be made repeatedly.

On the other hand, an individual selective calling receiver (hereinafter simply referred to as a "receiver") having at least two calling information storage sections for storing calling information such as a calling number and a message is capable of handling two or more calls and In the case where the calling information included in the call is received and the calling information is stored, and the above-mentioned repeat call is made, it is okay to judge the above two or more calls as the same call. However, conventional receivers always receive a new call each time they receive a call specifying the receiver's calling number, regardless of whether the call information is the same as the previously received call information. It was stored as information, and at the same time, when the memory became full, it was erased in chronological order.

Therefore, when the above-mentioned repeat call is made, calls with the same call information (hereinafter referred to as "same call")
That's what it means. ) is received in succession, there is a drawback that at least two call information storage units in the receiver become full or nearly full with the same call information.

The present invention eliminates the prior art drawback in which calling information is stored more than necessary by the same call, thereby erasing previously stored useful calling information. To provide an individual selective calling receiver which can effectively utilize a calling information storage section without erasing previously stored useful calling information.

According to the present invention, a carrier wave modulated by a signal including a calling number and a message signal read to the calling number is received and demodulated, and when this demodulated signal matches a predetermined own signal, a notification to that effect is announced. In the individual selective calling receiver, the first
A first message signal corresponding to the received signal is stored and retained, and the stored first message signal is compared with a second message signal corresponding to the received and detected second signal, and it is determined that the two are different. There is obtained an individual selective calling receiver characterized in that it includes a central processing unit that performs control to store and hold the second message signal when the second message signal is received.

An explanation will be given below based on the drawings of the embodiment.

FIG. 1 is a block diagram of a receiver according to an embodiment of the present invention. In FIG. 1, an antenna 1 is connected to an input of a modulated signal receiving section 2. In FIG. The output of this modulated signal receiving section 2 is connected to the input of a demodulating section 3, and the output of this demodulating section 3 is connected to the calling number comparison detecting section 4.
connected to the input of This calling number comparison detection section 4
, a memorized call information signal (hereinafter referred to as "message signal") A and this message signal A.
A clock H and a calling number detection pulse D synchronized with the clock H and a calling number detection pulse D are sent to the calling information storage section 5. In addition, part of the call information detected by the call number comparison detection unit 4 is
The information is sent to the call information display section 6. This call information display section 6 outputs the stored contents of the call information storage section 5 by a signal L.
It is configured to be expressed by.

With such a configuration, the modulated signal containing the calling information received by the calling number comparing and detecting section 4 via the antenna 1 is demodulated by the demodulating section 3 and then sent to the called number comparing and detecting section 4 by the receiver. It is detected by comparing it with the calling number held by the person. A part of the detected call information prompts the call information display section 6 to display the call information, and the other part is temporarily stored in the call information storage section 5, and the stored contents of the call information storage section 5 are stored in the call information display section 6. L can be displayed on the call information display section 6 at any time.

FIG. 2 shows the message signal A, clock H,
and a time chart of the calling number detection pulse D. In FIG. 2, X is the time from the fall of the calling number detection pulse D to the first rise of the shift clock H, T is the half time of the period of the shift clock H, and Y is the message signal [4-bit NRZ (non-return-to-zero) signal] This is the time from when the first clock pulse of the shift clock H falls after reading A to when the called number detection pulse D of the next call falls. Also t ₁ to _{t 13}
is the rise or fall time of each pulse, t ₁
~t ₇ is the first call, t ₈ ~ _{t 10} is the second call, t ₁₁
~t ₁₃ indicates the third call. Here, X,
Y and Z are set to have enough time for one bit to completely shift in the JK flip-flop.

In the above example, the message signal A and the shift clock H have a 4-bit configuration, but the number of signal bits may be increased depending on the amount of information.

FIG. 3 is a detailed block diagram of the call information storage section 5 shown in FIG. 1. In FIG. 3, the call information storage section 5 includes a sub-storage section 7, a first main storage section 8, a second main storage section 9, and a comparison section 10.

The message signal A and the clock H are guided to this sub-storage section 7. The output of this secondary storage section 7 is led to the first main storage section 8 and the comparison section 10. The output of this first main storage section 8 is led to a second main storage section 9 and a comparison section 10. The calling number detection pulse D is input to the comparison unit 10, and the comparison unit 10 compares the storage contents of the sub storage unit 7 and the first main storage unit 8 and the contents of the sub storage unit 7 and the second main storage unit 9. The respective stored contents are compared and comparison information is taken out via terminals E, F, and G. Further, B is applicable only when the storage contents of the secondary storage section 7 and the storage contents of the first main storage section 8 are different, and the storage contents of the secondary storage section 7 and the storage contents of the second main storage section 9 are different. C ₈ and C 9 are shift pulses that are generated, and C 8 and C ₉ are shift pulses that cause the storage contents of the sub storage section 7 to be transferred to the first main storage section 8 and the storage contents of the first main storage section 8 to the second main storage section 8. It is a signal line for memory shifting to the storage section 9, and L is a signal line for carrying out the call information shown in FIG. This is a signal line for displaying on the display section 6.

With this configuration, after the power is turned on, the first message signal A is first stored in the sub-storage section 7, and the storage contents of this sub-storage section 7 are sent to the comparison section 10. Next, the second call is received and the comparator 1
At the same time as the detection pulse D informing that the calling number has been detected is input to 0 (t ₈ in FIG. 2), the detection pulse D becomes the shift pulse B, and the message contents in the sub-memory section 7 are transferred to the first main memory section 8. memory is shifted to Then, immediately after that (Fig. 2 t ₉ ),
The message signal A of the second call is input to the sub-storage section 7, and the comparison section 10 compares the storage contents of the sub-storage section 7 with the storage contents of the main storage sections 8 and 9.

This comparison unit 10 is configured such that the storage content of the secondary storage unit 7 and the storage content of the first main storage unit 8 are different, and the storage content of the secondary storage unit 7 and the storage content of the second main storage unit 9 are different. It has a function to enable shift pulse B to be generated only when the shift pulse B is generated. Therefore, when the third call is received and the detection pulse D is generated in a state where the shift pulse B can be generated (t ₁₁ in FIG. 2), the detection pulse D becomes the shift pulse B as it is, and the storage contents of the sub-storage section 7 are is memory shifted to the first main memory section 8, and the memory contents of the first main memory section 8 are memory shifted to the second main memory section 9. Then, immediately after that (Fig. 2 t ₁₂ ),
The message signal A of the third call is input to the sub-storage section 7.

From then on, the above operation continues, and the main memory unit 8 or 9
If the storage contents of the sub-storage section 7 are the same as those of the sub-storage section 7, even if the detection pulse D is generated, the comparison section 10
Shift pulse B is not generated due to the function of This is not done, and only the storage contents of the sub-storage section 7 are updated by the next message signal A.

FIG. 4 is a detailed block diagram of the call information storage section 5 shown in FIG. 3. The call information storage section 5 shown in FIG. 4 stores each storage section shown in FIG.
It has a 4-bit configuration using flip-flops, and the comparing section consists of only one AND circuit, two OR circuits, and eight NOR circuits.

In FIG. 4, each symbol corresponds to each symbol in FIG. 3, respectively. The sub storage section 7 has JK for memory.
Flip-flops 11 to 14 are provided, and a JK flip-flop 15 for memory is provided in the first main memory section 8.
18 are further provided with memory JK flip-flops 19 to 22 in the second main storage section 9,
Further, the comparator 10 is provided with NOR circuits 23 to 30, OR circuits 31 and 32, and an AND circuit 33, and the sub storage section 7 is further provided with an inverter circuit 34.
is provided and configured as shown in the figure. Note that the signal L (L ₇ , L ₈ , L ₉ ) is not directly related to the present invention, so its explanation will be omitted.

With this configuration, the operation of the storage section of this embodiment will be explained. The sub-storage section 7 constitutes a serial register, and the message signal A is input to the sub-storage section 7 by the shift clock H. When finished,
Clock H stops. The message in the sub-storage unit 7 that has been input is sent to the NOR circuits 23 to 2 via the terminal E.
6 and 27 to 30, and are compared with the output of the first main storage section 8, which enters the terminal F, and the output of the second main storage section 9, which enters the terminal G.

Here, if there is even a slight difference between the secondary storage section 7 and the first main storage section 8, or between the secondary storage section 7 and the second main storage section 9, the OR circuit 31 or 32 becomes high level. Shift pulse B can be generated by detection pulse D only when OR circuits 31 and 32 are both at high level. Therefore, the storage contents of the secondary storage section 7 are different from the storage contents of the first main storage section 8,
When the storage contents of the secondary storage section 7 are different from the storage contents of the second main storage section 9, a shift pulse B is generated, and the message of the secondary storage section 7 is transferred to the first main storage section 8. The message in the main memory section 8 is shifted to the second main memory section 9, and the message in the second main memory section 9 is erased. Immediately after that, a new message will be input into the secondary storage section 7.

Conversely, if at least one of the storage contents of the secondary storage section 7 and the storage contents of the first main storage section 8 or the storage contents of the secondary storage section 7 and the storage contents of the second main storage section 9 are completely equal, In this case, the output of the OR circuit 31 or 32 becomes low level, the shift pulse B is not generated even if the detection pulse D is input, and the stored contents of the first main memory section 8 and the second main memory section 9 remain unchanged. Retained.

In the above embodiment, the number of memory sections is three and the number of bits in one memory section is four, but the present invention is not limited to this. The comparison section consists of one AND circuit, (n-1) OR circuits, and a NOR circuit [(n-1).
1)×m], the same implementation is possible. Here, n is the number of storage units, and m is the number of bits in one storage unit.

In addition, the functions of the above-mentioned embodiments can be used as other embodiments.
It can also be realized using a CPU (central processing unit).

As described above, according to the present invention, by using a simple call information comparison section using only an AND circuit, an OR circuit, and a NOR circuit, when the same call is received, the previous memory is not erased,
There is an excellent effect that the call information storage section can be used effectively.

In addition, in line with this effect, it is also easy to add a function that does not issue an alert, vibration, LED display, etc. when the same call is received, and conversely issues the above alert, etc. in other cases. This has the advantage of eliminating the trouble of alerts and the like, especially when the same call is received in succession.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a receiver according to an embodiment of the present invention. Figure 2 is also an operation time chart. Third
The figure is also a block configuration diagram of the call information storage section. FIG. 4 is a detailed block diagram of the call information storage unit. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Modulated signal receiving section, 3... Demodulating section, 4... Calling number comparison detection section, 5... Calling information storage section, 6... Calling information expression section, 7... Sub-storage section, 8...
First main memory section, 9... Second main memory section, 10... Comparison section, 11-22... Flip-flop for JK, 2
3 to 30...NOR circuit, 31,32...OR circuit, 3
3...AND circuit, 34...Inverter circuit.

Claims (1)

[Claims] 1. An individual selective calling receiver that receives and demodulates a carrier wave modulated by a signal containing a calling number and a message signal following the calling number, and notifies when this demodulated signal matches a predetermined self-signal. , a first message signal corresponding to the detected first signal is stored and held, and the stored first message signal and the detected second message signal are stored and held.
an individual selection call characterized by comprising a central processing unit that compares the signal with a second message signal corresponding to the signal and controls the second message signal to be stored and held when it is determined that the two are different. receiver.