JPS5928096B2 - Selective call receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a selective call receiving device with an improved ringing tone generation function.

A selective call receiving device emits a ring tone in response to a paging signal from a base station, and notifies the person carrying the receiving device that a call has been made. Depending on the situation, the ringing sound may be inconvenient.

In such a case, the generation of the ring tone is prohibited by operating a switch, etc., and the receiving device stores the call in the newly installed dedicated memory, and when the situation becomes such that the ring tone can be generated. , a method is generally known in which the stored contents are read out by operating a switch or the like, and when a ring tone is emitted, it is assumed that there is a call. However, the conventional selective call receiving apparatus has the disadvantage that the entire circuit configuration is complicated because it requires a dedicated memory circuit. SUMMARY OF THE INVENTION It is an object of the present invention to provide a selective call receiving device which eliminates the drawbacks of the above-mentioned conventional example and can store the fact that a call has been made and check it later with a simple configuration.

In order to achieve the above object, the present invention uses a decoder with a latch function, and turns off the power supply to the ringing tone generating means driven by the output of the decoder by turning off the first switch, so that there is no sound even when a call is received. The state can be maintained,
Further, the first switch is later turned on to obtain a V-fixed time decoder output using a timer, and a speaker is sounded through a ringing tone generation circuit to notify that a call has been made. be.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below using one embodiment thereof with reference to the drawings.

In the drawing, 1 is an antenna that receives a calling signal, 2 is a reception circuit that amplifies the received signal, performs detection, etc., and 3
is a decoder that detects that it is its own calling signal and, once called, continuously generates an H level output until it is reset, and has a built-in latch circuit.

A decoder including this latch circuit is also used in a conventional selective call receiving apparatus. Note that the reset signal is applied to terminals 3a and 3b of the decoder 3 to reset the latch circuit.

Reference numeral 4 denotes a ringing tone generating circuit which constitutes a ringing tone generating means together with a transistor 5 and a speaker 6; 5 a transistor serving as an amplifying section for amplifying the ringing tone to a level that drives the speaker 6; and 7 controlling the volume generated by the speaker 6. 8 is a switch (first switch) that is turned off when memorizing a call; one end (input side) is connected to the power supply, and the other end (output side) is connected to the variable resistor 7 and the transistor via the speaker 6. 5.

9 is a power switch, and 10 is a DC power supply.

11 is a reset switch (second switch) for manually stopping the generation of the ringing tone; 12 is an AND gate; 13 is a timer for generating a reset signal; and 113a is a terminal for starting the timer. be.

Next, the operation of the embodiment configured as above will be explained. Normally, switches 8 and 9 are on and switch 11 is off. In this state, a selective calling signal transmitted from the base station is received by antenna 1, detected by circuit 2, and applied to decoder 3. If the decoder 3 determines that the signal is its own calling signal, the signal is sent to the ringing tone generation circuit 4. Ringing tone generation circuit 4 generates an audible ringing tone and drives transistor 5. Transistor 5 drives speaker 6, and a ringing tone is emitted. The volume of this ringing tone can be freely set using the variable resistor 7. here switch 8
Since the gate is 0N, the signal from the decoder 3 causes the gate 12 to become 0N, and at the same time, the timer 13 starts.
A set signal is generated after a predetermined time. This reset signal is applied to the terminal 3a of the decoder 3, and the decoder is reset and the generation of the ringing tone is stopped. If the reset switch 11 is turned on before the reset signal is issued by the timer 13, the decoder 3 is similarly reset and the ringing tone is stopped. Next, we will explain what happens when the ringer sounds and you are in a bad situation.

In this case, switch 8 is turned off. When a self-calling signal is received in this state, the power applied to the speaker 6 and the transistor 5 is cut off by the switch 8, so even if the ringing tone generating circuit 4 generates a ringing tone, the speaker 6 does not respond to the ringing signal. Make no sound. Further, since the switch 8 is turned off, the AND gate 12 is turned off, and therefore the timer 13 does not start. Reset switch 11
Even if the switch 8 is operated by mistake, the decoder 3 will not be reset since the switch 8 is set to 0FF. Therefore, the decoder 3 continues to generate an output. As time passes, the situation becomes such that it is acceptable to emit a ringing tone, and when the switch 8 is turned on, the speaker power 6 is activated and an audible tone is emitted. At the same time, the gate 12 also becomes ON, and the timer 13 starts.
The following is the same as the normal state, and the ringing tone is automatically reset or manually reset (by the switch 11).
Note that it is practically convenient to use an integrated volume for the variable resistor 7 and the switch 8. As explained above, according to the present invention, by turning on and off the power supply to the ringing tone generating means connected to the decoder with the latch function, the ringing tone can be switched between sounding and silent, as well as being silent. Even if the power supply is turned back on at a later time, the call information latched in the decoder is used to generate a sound to notify that a call has been made, so there is no need to provide a complicated dedicated memory circuit. This has the advantage that it can satisfy the later playback function of the ring tone required of the above-mentioned call receiving device. Furthermore, since the timer can be reset using both the timer and the second switch, the second switch can be reset even in the middle of the timer operation after confirming the ring tone to prepare for a new call. Since the second switch is disabled, there is no need to worry about accidentally setting it before confirming the call.

[Brief explanation of drawings]

The drawing is a block diagram of a selective call receiving apparatus according to an embodiment of the present invention. 3... Decoder, 4... Ringing tone generation circuit, 6...
Speaker, 8... first switch, 11... second switch for resetting, 13... timer.

Claims (1)

[Claims] 1. A decoder that detects a ringing signal and continuously generates an output until a reset signal is added, a ringing tone generation circuit that generates a ringing tone by the output of the decoder, and a speaker driven by the output of the ringing tone generation circuit. a first switch whose output side is connected to the amplification section and for controlling power supply from an input side power supply; and a first switch provided between the output side and a reset terminal of the decoder and closed. a second switch for resetting the decoder; an AND gate that ANDs the output of the decoder and the power supply voltage supplied from the output side; the output of the AND gate is connected to a start input terminal; and a timer that generates a reset signal for resetting the decoder by its output.