JPH04349725A - Selective calling receiver - Google Patents

Abstract

PURPOSE:To extend the battery service life by switching power supply to a radio section from the operation of receiving an address signal into the operation of receiving a preamble signal when a specific signal is received. CONSTITUTION:The communication signal consists of a 576-bit preamble signal, a synchronizing signal and 8 frame signals, and one batch is referred to as a period from the synchronizing signal till the frame signal (32+512 bits). The address signal is sent in the ascending order corresponding to each frame. Power is supplied to a radio section for the reception of the synchronizing signal and the address signal till the address signal reaches an individual calling number or over (1-4 batches). When a specific signal is received, the power supply to the radio section for the reception of the synchronizing signal and the address signal so far is switched into the power supply to the radio section for receiving the preamble signal. Thus, the operating time of the radio section is reduced and the efficiency of battery saving is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selective call receiver, and more particularly to a battery saving (intermittent reception) system.

0002

[Prior Art] A conventional selective calling receiver is
160830, the generic name POCSA
The G-code method is popular. In this system, a preamble signal is followed by a batch consisting of a sync signal, an address signal, and a message signal. When the receiver side detects the preamble signal, it intermittently supplies power to the radio section in order to detect the sync signal and address signal. Additionally, if the address signal matches the individual calling number, a continuing message signal is received and stored in memory. When the sync signal cannot be detected approximately twice, the radio section stops detecting the sync signal and address signal, and the radio section is intermittently supplied with power for preamble signal detection.

0003

[Problem to be Solved by the Invention] In the above-mentioned prior art, for self-reception, which is generally said to be about 2 times a day,
Power is supplied to the wireless unit due to the much larger number of receptions other than itself, which does not contribute to improving battery saving.

Therefore, in the present invention, when a specific signal (for example, a specific address number) is received, the power supply to the wireless section is changed from the operation of receiving the address signal (address number) even if address transmission continues. It is an object of the present invention to provide a selective call receiver having a long battery life by switching to an operation of receiving a preamble signal.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the receiver of the present invention is designed to be able to determine a specific signal from among the received signals. That is, the first power supply means supplies power to the radio section intermittently at a predetermined period so that the preamble signal can be detected, and the first power supply means supplies power to the radio section intermittently at a predetermined period so that the address signal and the specific signal can be detected. a second power supply means for supplying power; a specific signal detection means for detecting a specific signal from the wireless unit; and when the specific signal detection unit detects the specific signal, the second power supply unit supplies power to the wireless unit. The first power supply means has a switching means for switching from the first power supply means to the first power supply means.

[0006]

[Operation] In order to receive the address signal and the specific signal, power is supplied to the radio section from the second power supply means, and when it is determined that the specific signal has been received by the specific signal detection means, the power supply of the radio section is performed. The supply is switched from the second power supply means to the first power supply means receiving the preamble signal. Therefore, power consumption in the receiving section is suppressed.

[0007]

[Examples] The details of the present invention will be explained below with reference to Examples. FIG. 1 is a block diagram of a selective call receiver according to the present invention. A desired radio frequency is demodulated by a radio section 2 including a discriminator via a built-in antenna 1, and converted into a rectangular wave by a waveform shaping circuit 3. Wireless section 2 and waveform shaping circuit 3
A power supply control circuit 4 that supplies power to is controlled by a control section 5. The power supply control circuit 4 includes first power supply means for supplying power to the wireless section 2 in order to receive the preamble signal;
It has a second power supply means for supplying power to the wireless section 2 in order to receive the sync signal, address signal and specific signal. The control unit 5 performs bit synchronization with the received signal, frame synchronization, battery saving means to reduce power consumption of the radio unit 2, etc., and an address signal from the radio unit 2, an individual calling number of the receiver, and a specific number (signal). Comparison with written data from the P-ROM 6 (individual call number storage means) is performed with error control, and a comparison means for determining whether or not a call has been made is controlled.

When the match with the individual call number is confirmed, the subsequent message data is stored in the memory 9 (storage means) and used by the alarm device 8 such as a buzzer, LED or vibrator via the alarm drive circuit 7. Notify the person of the call. Alternatively, when a match with a specific number is confirmed, address reception is switched to preamble reception. Further, the stored message is sent to the LCD drive circuit 10 via the control section 5 by an external operation member 13 consisting of switches, and is displayed on the LCD display 12. The power switch 13a, which is a part of the external operation member,
Basically, when you do not want to receive a message, turn off the power switch 13a to extend the battery life. The control unit 5 and the LCD drive circuit 10 include a crystal oscillation circuit 1.
A clock signal is sent from 1. Power supply control circuit 4, control unit 5, memory 9, LCD drive circuit 10, and oscillation circuit 11
The message processing section 14 is composed of a one-chip microcomputer. A battery 15 supplies power to the selective call receiver.

FIG. 2 is a flowchart of the receiving operation according to the present invention. The example is P with a transmission speed of 512 bps.
OCSAG format, 576-bit preamble signal (:PRE), sync signal (:SC) and 8
Each batch consists of frame signals (0F to 7F), and one batch refers to the period from the sync signal to the frame signal (32+512 bits). Further, address transmission (message transmission) is assumed to be transmitted for each frame. The individual calling number is "800" (frame: 0F), and the specific number is "800" (frame: 0F).
1978880" and both numbers are stored in the individual call number storage means. Also, the address signal (number) of the 0 frame of the 1st batch is "480", the address signal of the 0 frame of the 2nd batch is "800", 3 The address signal of frame 0 of batch 0 is "1200", the address signal of frame 0 of batch 4 is "1978880", and there is no address transmission of frame 0 from batch 5 onwards.

[0010] The receiver is "powered on" by the power switch.
(20) Then, the process advances to "Preamble signal?" (21), where power is supplied to the wireless unit for a short time (about 20 bits) and it is determined whether the received signal is a preamble signal. If no preamble signal is detected, the process proceeds to "1 second timer set" (22), which sets a 1 second timer. Then, the process advances to "1 second elapsed?" (23), which determines whether the set timer has elapsed for 1 second. If 1 second has not elapsed, the determination of whether 1 second has elapsed is repeated. When one second has elapsed, the process returns to "Preamble signal?" (21) to determine whether it is a preamble signal. That is, power is supplied to the radio section for a short period of one second, and preamble signal detection is performed. When a preamble signal is detected, the process advances to "Sync signal?" (24), which determines whether it is a sync signal. Power is supplied to the wireless section during this "sync signal?" (24) period as well. This process is repeated until a sync signal is detected. When a sync signal is detected, the process proceeds to ``sync timer set'' (25), in which a sync timer is set to determine the time to supply power to the wireless unit in accordance with the next sync signal. Next, the process proceeds to "address timer set" (26), which sets an address timer that determines the time to supply power to the wireless section in accordance with the address signal of the own frame. In the embodiment, since frame=0, the timer time is set to "zero". Then, the process advances to "Address timer elapsed?" (27), which determines whether the address timer has elapsed. In the embodiment, since the timer time is "zero", the address signal is immediately received. That is, power is continuously supplied to the wireless section from the detection of the sync signal to the detection of the address signal. The address signal of the first batch is "480" and when the reception of the address signal is completed, the process goes to "Address 1 same?" (28) which determines whether this address signal and the individual call number are the same (called). . Since the addresses are not the same, the power supply to the wireless unit is stopped and the address signal and specific signal are determined to be the same or not. "Address 2 is the same?" (
Proceed to step 30). Since the numbers are not the same here as well, the process advances to "Sync timer elapsed?" (31), which determines whether the previously set sync timer has elapsed. This process is repeated until the next sync signal is transmitted (the sync timer has elapsed). When the sync timer has elapsed, the process advances to "sync signal?" (32), where power is supplied to the wireless section again to detect the sync signal and the sync signal is detected. If the sync signal cannot be detected, the “Preamble signal?” (21
), and the preamble signal is detected.

When the second batch of sync signals is detected as in this embodiment, a sync timer is set to determine the time for supplying power to the wireless unit in accordance with the next sync signal. Proceed to (25). Similarly, when the reception of the address signal is completed, the process proceeds to "Is the address the same?" (28) where it is determined whether the address signal and the individual calling number are the same (called). In the second batch, since the address signal and the individual call number are the same, the process proceeds to "message storage" (29) where a message following the address signal is stored. Then, the power supply to the wireless section is stopped, and the process proceeds to step (31). Similarly, detect the third batch of sync signals using "sync signal?" (32),
The process proceeds to "sync timer set" (25), where the sync timer is set again to determine the time to supply power to the wireless section in accordance with the next sync signal.

The processing of the third batch is also similar to the processing of the first batch.

The processing for the fourth batch is similar up to step (30). The address signal of the 4th batch is “1978”
880", which is affirmed in step (30), and "Preamble signal? ” (21), a preamble signal is detected, and this process is repeated until the next preamble transmission. In the embodiment, address transmission is performed for each frame, and a specific signal is sent at the end of each frame.

That is, until the address signal becomes a specific signal (between batches 1, 2, 3, and 4), power is supplied to the radio section (second power supply means) for receiving the sync signal and address signal. When a specific signal is received, power is supplied to the radio unit for receiving the sync signal and address signal (including the specific signal), and power is supplied to the radio unit for receiving the preamble signal (first power supply means)
Switch to . Therefore, the operating time of the wireless section is shortened and battery saving efficiency is improved.

FIG. 3 is a timing chart diagram of FIG. 2. The first power supply output corresponds to step (21) processing in FIG. 2. In other words, it supplies power for 20 bits. The second power supply output corresponds to step (24) and (28) in FIG.
, (29) and (32) are combined. In other words, it will be 32 bits (steps: 24) + 32 bits (1/2 of the frame) (excluding message reception, and since the address signal consists of 2 words and can be sent to either, it will actually be at least 64 bits) bits).

In this embodiment, the specific signal is an address number, but it is not limited to this. For example, P
The same thing can be done even if the configuration is such that a specific signal is used in the position of the standard synchro signal of the OCSAG standard. Further, although the specific signal is stored in the individual call number storage means so that it can be changed from the outside, this is not limited to this, and the same may be done if it is fixed in the ROM (within the program) of the microcomputer, for example.

[0017]

[Effects of the Invention] As described above, according to the present invention, it is possible to reduce the power supply to the radio unit due to calls other than the self, and to provide a selective call receiver with high battery saving efficiency and long battery life. can do.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a selective call receiver of the present invention.

FIG. 2 is a flowchart of reception processing according to the present invention.

FIG. 3 is a timing chart diagram of FIG. 2;

[Explanation of symbols]

2...Radio section 4...Power control 5...Control unit 6...P-ROM 9...Memory 10...LCD drive circuit 13...External operation member 14...Message processing section 15...Battery

Claims (1)

[Claims] 1. A radio section that receives a preamble signal, a specific signal, and an address signal; a first power supply means that supplies power to the radio section intermittently at a predetermined period so that the preamble signal can be detected; a second power supply means for intermittently supplying power to the radio section at a predetermined period so as to detect the address signal and the specific signal; and an individual call number storage means for storing the individual call number of the selective call receiver. a specific signal detecting means for detecting the specific signal from the wireless unit; and when the specific signal detecting unit detects the specific signal, power supply to the wireless unit is switched from the second power supply unit to the first power supply unit. A selective call receiver comprising a switching means for switching to a power supply means.