JPH01286533A - Radio selective call receiver - Google Patents

Abstract

PURPOSE:To use a power switch of a general purpose structure by interrupting a preset circuit from a speaker even in the event of momentary interruption on the way of changeover of a power switch so as to eliminate any discharge path thereby preventing the reduction in the output potential of the preset circuit. CONSTITUTION:In the case of changeover of a slider 6 of a power switch 5 in a way of B C or C B, the preset circuit 2 and a power battery 3 are interrupted momentarily, but the preset circuit 2 is not connected to ground and not connected to the speaker 4, then no discharge path is formed. Thus, the output potential of the preset circuit 2 is not largely reduced by the momentary interruption. Thus, a general purpose switch is adopted for the power switch 5 used for the power switch circuit and the degree of freedom of the selection of the power switch 5 is expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to radio selective calling receivers such as Pocket Peμ, and more particularly to radio selective calling receivers using a three-position power switch.

BACKGROUND OF THE INVENTION FIG. 2 shows a block diagram of a power switch circuit in a conventional radio selective calling receiver. In FIG. 2, 11 is a processing circuit for identifying a demodulated received signal, and 12 is a preset circuit for setting the processing circuit 11 to an initial state. 13
is a power source battery, which is connected to the processing circuit 11. 1
4 is a speaker that produces a ring tone. Reference numeral 15 denotes a three-position sliding power switch, and the speaker 14 and preset circuit 12 are connected to a power battery 13 via the three-position sliding power switch 15. The first switch of this power switch 15. Second. Third terminal 16a, 16b, 16c
are commonly connected to the power supply battery 13, the fourth terminal 16d is connected to the preset circuit 12, and the fifth terminal 16e is connected to the speaker 14. Three terminals are made conductive at the same time. 18 and 19, one of which is connected to the preset circuit 12
and the fourth terminal 16d, the other of the resistors 18 is connected, and the other of the resistors 19 is connected to the speaker 1.
Connected to 4.

Next, the operation of the power switch circuit of the conventional radio selective calling receiver will be explained. In FIG. 2, when the slider 17 of the power switch 15 is in position A, the wireless selection receiver is in the "off 1" state, and when it is in position B or C, it is in the 1-on-1 state.

The processing circuit 11 is constantly supplied with power in order to identify the state of the power switch 15. The 1-on state at positions B and C allows the resistor 19 to be used as a discharge means for a radio selective calling receiver, for example, so that the volume of the speaker 14 is loud at position B and silent at position C.

Turn the power switch 15 to A-4B.

Alternatively, when switching is made between A-B-C, the preset circuit 12 is connected to the power supply battery 13, operates by being supplied with power, and sets the processing circuit 11 to an initial state.

Here, when switching the power switch to B-C or C-hB, if the preset circuit 12 and the power supply battery 13 are momentarily disconnected, the output potential of the preset circuit 12 decreases due to discharge, and if this potential decrease is large, A problem arises in that the preset operation is performed again despite the ON status. This potential drop can be reduced by providing a discharge time constant to the preset circuit 12 and the resistor 18, but this has no effect when the speaker 14 is producing sound, and the speaker 1
4, a discharge occurs instantaneously, resulting in a large potential drop.

Such switching of the power switch 15 while the speaker door is ringing results in the same operation as the switch 1 off 1.

For this reason, the power switch 15 is one that does not cause instantaneous interruption of the circuit when switching. In FIG. 2, the power switch 15 is provided with five terminals 16a to 16e, and the three terminals are connected at the same time no matter where the slider 17 of the power switch 15 is positioned.

In this way, even in the conventional radio selective calling receiver described above, the above operation can be realized using the power switch 15 having the above structure.

Problems to be Solved by the Invention However, in the above-mentioned conventional 1s-less selective call receiver,
Since the power switch 15 is a sliding type that simultaneously conducts three terminals, there is a problem in that an expensive power switch with limited flexibility in shape must be used.

The present invention is intended to solve these conventional problems.
The object of the present invention is to provide a wireless selective calling receiver using a power switch having a general-purpose structure.

Means for Solving the Problems In order to solve the above problems, the present invention provides a processing circuit for identifying a demodulated received signal, a preset circuit for setting this processing circuit to an initial state, and a speaker for producing a ringing tone. A wireless selective calling receiver having a three-position switching two-circuit power switch is provided, and a preset circuit and a power battery are connected to predetermined terminals of a first circuit of the power switch, and a second circuit is connected to a preset terminal of a first circuit of the power switch. A speaker is connected to a predetermined terminal of the circuit, and predetermined terminals of the first and second circuits are connected to each other, and the connection between the power battery, the preset circuit, and the speaker is cut off when the power switch is in a first position. , the power source battery is connected to the preset circuit through the first circuit in the second position and the third position, and the respective volumes are set to be different through predetermined terminals of the second circuit. The preset circuit is connected to a speaker, and is configured so that the preset circuit and the speaker are not connected even during switching of the power switch.

Operation With the above configuration, the wireless selective calling receiver is in the OFF 1 state when the power switch is in the first position, and in the second position, for example, the speaker is used at a low volume, and the third For example, a speaker is used to increase the volume at the location.

In addition, in the second and third positions, the preset circuit is connected to the power supply circuit, and even if there is a momentary interruption while switching the KW source switch, the preset circuit and the speaker are disconnected, so the speaker, etc. There is no discharge path to the preset circuit, so the output potential of the preset circuit will not drop significantly. In addition, when the 7-source switch is 1 OFF 1, the output potential of the preset circuit is discharged by the ground, and the ground V base/I
When the power switch is turned down to /, it becomes possible to take over the 1-on-1 operation of the next power switch. Therefore, the power switch circuit can be configured using a versatile and inexpensive switch.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram of a power switch circuit of a radio selective calling receiver showing one embodiment of the present invention. In FIG. 1, 1 is a processing circuit for identifying a demodulated received signal;
The processing circuit 1 is a preset circuit for setting to an initial state. 3 is a power supply battery, processing times &! ! Connected to 1. Reference numeral 4 designates a speaker for producing a ringing tone, and reference numeral 5 designates a three-position two-circuit type power switch which is provided with two circuits each having five terminals and can be switched to three positions by a slider 6. In this first circuit 7 of the power switch 5, the first terminal 7a is grounded, the second terminal 7b and the third terminal 7c are commonly connected to the preset circuit 2, and the fourth terminal 7d is commonly connected to the fifth terminal 7c. It is connected to the power supply battery 3. Further, in the second circuit 8 of the power switch 5, the first terminal 8a is open, the second terminal 8b is commonly connected to the third terminal 8c, and the fourth terminal 7d and the fifth terminal 7e of the first circuit 7, 4th terminal 8d
is connected to the speaker 4 via the resistor 9, and the fifth terminal 8e
is directly connected to speaker 4. Further, the slider 6 has a structure in which two terminals on both sides of three consecutive terminals are connected.

Next, the operation of this radio selective calling receiver will be explained. When the slider 6 of the power switch 5 is in position A, the wireless selective calling receiver is in the off state, and the first terminal 7a and third terminal 7c are connected in the first circuit 7 of the power switch 5, and the preset circuit is activated. 2 is grounded, and in the second circuit 8, the first terminal 8a and the third terminal & are connected. When the slider 6 is at position B and position CK, the radio selective calling receiver is in the ON position, position BK fielder 6
When there is a second terminal 7 in the first circuit 7,
b and the fourth terminal 7d are connected, and the preset circuit 2 is connected to the power battery 3. In the second circuit 8, the second terminal 8b and the fourth terminal & are connected, and the power battery 3 is connected to the speaker 4 through the resistor 9. connected to. In this case, the speaker 4 as a calling means is used at a low volume. Furthermore, when the slider 6 is at position C, the third
The terminal 7c and the fifth terminal 7e are connected to form the preset circuit 2.
is connected to the power source battery 3, and in the second circuit 8, the third terminal & and the fifth terminal 8e are connected to the power source battery 3.
It is connected to the front speaker 4. In this case, the speaker 4 as a calling means is used with a high volume.

Here, move the slider 6 of the power switch 5 from B to C or C.
-B, the preset circuit 2 and the power supply battery 3 are momentarily disconnected. However, since the preset circuit 2 is not grounded and is not connected to the speaker 4, and therefore has no discharge path, the output potential of the preset circuit 2 does not drop significantly due to instantaneous interruption as in the conventional case. Also, move the slider 6 of the power switch 5 to B→
When the AK is switched to the 1-off-0 state, the preset circuit 2 is grounded, and the output potential of the preset circuit 2 is discharged by the ground and drops to the ground level, and the preset operation is performed in the next 1-on-1 state. The processing circuit 1 is set to an initial state.

Effects of the Invention According to the present invention, even if the preset circuit and the power supply battery are momentarily interrupted, there is no discharge path for a speaker or the like as in the conventional case, so the output potential of the preset circuit will not drop significantly due to the instantaneous interruption. Therefore, it is possible to make the power switch used in the power switch circuit more versatile.
This has the advantage of increasing the degree of freedom in selecting the power switch to be used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a power switch circuit of a radio selective call receiver showing an embodiment of the present invention, and FIG. 2 is a block diagram of a power switch circuit of a conventional radio selective call receiver. 1... Processing circuit, 2... Preset circuit, 3...
Power supply battery, 4... Speaker, 5... Power switch,
6... Suffida, 7.8... First and second circuits,
7a-7e. 8a to 8e...first to fifth terminals, 9...resistance. Agent Yoshihiro Morimoto Figure 1 Figure 2

Claims (1)

[Claims] 1. A wireless selective calling receiver having a processing circuit for identifying a demodulated received signal, a preset circuit for setting the processing circuit to an initial state, a speaker for producing a ring tone, and a power source battery, A three-position two-circuit power switch is provided, a preset circuit and a power battery are connected to a predetermined terminal of a first circuit of the power switch, a speaker is connected to a predetermined terminal of a second circuit, and the first and second circuits are connected to a predetermined terminal of the second circuit. Predetermined terminals of the second circuit are connected to each other, the power supply switch is disconnected from the power supply battery and the preset circuit and the speaker when the power switch is in the first position, and the power supply battery is disconnected from the power supply battery when the power supply switch is in the second position and the third position. are connected to the preset circuit via the first circuit, and are connected to the speakers via predetermined terminals of the second circuit so that the respective volumes are different, including during the switching of the power switch. A wireless selective calling receiver configured such that the preset circuit and the speaker are not connected.