JPH0483431A - Selective call receiver - Google Patents

Abstract

PURPOSE:To make it possible to receive a message even when a power supply switch is disconnected on the way of reception by providing a power control means for supplying battery power to a radio part until power supply from a battery saving means to the radio part is ended. CONSTITUTION:When the battery saving means 5 supplies power to the radio part 2, the power control means supplies the power of a battery 15 to the radio part 2 until the power supply is ended. When power is supplied, the means 5 repeats processing for deciding whether power supply to the radio part 2 and a waveform shaping circuit 3 is stopped or not, and when power is not supplied, stops power supply to the radio part 2 and the circuit 3. Thereby, even when the power supply switch is turned off in reception, power is supplied to the radio part until the reception is ended so as to receive a message.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a selective call receiver.

[Prior Art] A conventional selective call receiver has a configuration in which a battery is connected in series with a power switch, as disclosed in Japanese Patent Application Laid-open No. 58-188943, and when the power switch is turned off, the power to the radio section is also turned off. It is designed to be cut in conjunction with each other.

[Problems and Objectives to be Solved by the Invention] As selective call receivers have become more sophisticated, they have come to be able to handle long messages such as katakana and kanji characters in addition to numbers.

The person carrying the phone is alerted by the ringing tone that there is a call, but is unable to know that the call is in progress and turns the power switch to 0FFL during the call. There was a problem that my phone was disconnected and I was unable to receive messages.

The present invention is intended to solve these problems, and its purpose is to provide a selective call receiver that stops power supply to the radio section when the 'as switch is turned off and enters the battery saving state. It's about doing.

[Means for Solving the Problems] A selective call receiver comprising a radio section that receives and demodulates modulated radio waves, a battery saving means that reduces power consumption of the radio section, a battery, and a power switch. The battery saving means has a determining means for determining that the power supply to the wireless section is stopped, and when the power switch is turned off, the determining means causes the battery saving means to stop supplying power to the wireless section. The selective call receiver further comprises a power control means for supplying the battery power to the radio unit until the battery power is supplied to the radio unit.

[Example] Hereinafter, the details of the present invention will be shown by 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. A power supply control circuit 4 that supplies power to the radio section 2 and the waveform shaping circuit 3 is controlled by a control section 5 .

The control section 5 performs bit synchronization with the received signal, frame synchronization, battery saving means for reducing power consumption of the radio section 2, etc., and the battery saving means stops power supply to the radio section 2 and the waveform shaping circuit 3. It has a determination means for determining whether or not the receiver has been called, and compares it with data from P-ROM6 (unique calling number storage means) in which the unique calling number of the receiver is written, in the error control phase. Controls the comparison means that performs the determination.

When the call is confirmed, the subsequent message data is stored in the memory 9 (storage means). Further, an alarm device 8 such as a buzzer, LED, or vibrator via the alarm drive circuit 7 notifies the user of the call. 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, is basically turned on when you do not want to receive messages.
Turn 3a off to extend battery life. A clock signal is sent to the control section 5 and the LCD drive circuit 10 from a crystal oscillation circuit 11. Power supply control circuit 4, control section 5
, a memory 9, an LCD drive circuit 10, and an 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 power supply (power supply) processing for the wireless unit, etc., according to the present invention. The power processing process (20) samples the power switch periodically (21).

If the power switch is ON, the process advances to power ON processing 27.

If the power switch is OFF, determine whether the power flag is 0 (22). If the power flag = 0, proceed to END (26) and end. If the power flag = 1, the battery saving means determines whether power supply to the radio section 2 and waveform shaping circuit 3 has been stopped (23).If power is being supplied, the battery saving means stops power supply to the radio section 2 and waveform shaping circuit 3. The process returns to (23) to determine whether power is being supplied, and this process is repeated.If power is not being supplied, the power supply flag is set to "0" (24). Then, power supply to the wireless section 2 and waveform shaping circuit 3 is stopped (25). Then, the process advances to END (26) and ends.

FIG. 3 is a timing chart of an embodiment of power processing according to the present invention. In the example, the signaling method is P
OC3AG format. The address (unique calling number) is ``0000009'', so the frame is ``1'' (lbatch is 8 frames from 0'' to 7'').

When the power switch is on, battery saving (
The BS) signal supplies power to the radio section, etc. at the timing of the preamble signal, synchronization signal (SC), and own frame. The power switch turned off while a message was being imported.
If it is FF, the end of the message is confirmed and power is supplied until the battery save state is reached. Therefore, the message will be received until the end.

In the embodiment, the power switch is turned off in the middle of a message, but the same applies when a preamble signal, synchronization signal, and address signal are being received.

[Effects of the Invention] As described above, the present invention provides a selective calling receiver that can receive messages by supplying power to the wireless unit until reception is completed even if the power switch is turned off during reception. It is something to do.

Radio department power control control part -ROM memory LCD drive circuit External operation member Message processing section battery

[Brief explanation of drawings]

FIG. 1 is a block diagram of a selective call receiver according to the present invention. FIG. 2 is a flowchart of power processing according to the present invention. FIG. 3 is a timing chart of power processing according to the present invention. Applicant Seiko Epson Co., Ltd. Agent Patent Attorney Kisanbe Meiki (and 1 other person) Figure 1 Figure 2

Claims (1)

[Claims] In a selective call receiver comprising a radio section that receives and demodulates a modulated radio wave, a battery saving means that reduces power consumption of the radio section, a battery, and a power switch, the battery saving means is configured to and a determination means for determining whether power supply to the radio unit is stopped, and when the power switch is turned off, the determination means determines that the battery saving means is supplying power to the wireless unit. A selective call receiver comprising power control means for supplying the battery power to the radio section until the end of the power supply.