JPS63191425A - Selective call receiver - Google Patents

Abstract

PURPOSE:To securely indicates the generation of a call by testing the operation of a melody tone generating circuit and changing a ring-back tone to a sound generated by a sound generating circuit when it is decided that specific operation is not performed. CONSTITUTION:A ringing control circuit 35 consists of a selective tone selecting circuit 36, an operation deciding circuit 37, and a gate circuit 38. The selective ring-back tone selecting circuit 36 allows an operation deciding circuit 37 to decides the operation of a melody IC 6 when a code matching circuit 31 generates a coincidence signal CS while a melody tone is specified with a selection switch 4. If it is decided that the melody IC 6 is unable to operate, a gate control signal for selecting a ringing tone is outputted to the gate circuit 38 and a ringing signal outputted by a ringing generating circuit 33 is supplied as the ring-back tone to a ring-back tone generation part 5. Consequently, a speaker 52 generates a melody tone to inform a subscriber of the generation of ringing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in a selective call receiver capable of selecting a ring tone or a melody tone as a ring tone.

(Prior Art) In general, a selective call receiver receives a selective call signal sent from a base station, compares the individual number code inserted in this signal with its own individual number code, and checks whether both codes are correct. When there is a match, it is assumed that a call to the own device has occurred, and the speaker generates a ring tone. Here, as the ring tone, for example, a signal of 2.6 kHz is used.
An intermittent tone signal at GHz frequency is used.

Incidentally, in recent years, in this type of receiver, attempts have been made to use a melody tone as a ringing tone in addition to the above ringing tone. For example, in this type of receiver, a melody sound generation circuit is installed in addition to the conventional sound generation circuit, and the desired side of the sound generation and melody sound can be specified by a selection switch. The device is configured to selectively output a ring tone or a melody tone specified by the selection switch as a ring tone when a call occurs to the own device. Select a soft melody tone in a relatively quiet place such as a room where the ring tone can easily affect the user, while select a ring tone in a place where the noise is loud and has little impact on others, such as inside a vehicle. Thus, it is extremely useful to be able to select the ring tone as appropriate depending on the place of use.

However, conventional receivers of this type are generally configured so that a general-purpose melody IC is prepared as a melody sound generating circuit, and the melody IC of the desired song is attached to the receiver through a socket. Melody I
If the user forgets to put on the C, or there is a poor contact, etc., a problem may occur in which the melody sound is not output and the call is not notified, which is undesirable. Generally, selective call receivers are configured to issue a low voltage alarm when the battery voltage drops below approximately 1.1V, but since the guaranteed operating voltage of general-purpose melody ICs is 1.2V, When the voltage drops, the melody IC becomes inoperable before a low voltage alarm is generated, and as a result, a problem occurs in that no calls are made. In addition, in order to eliminate these problems, the low voltage detection level of the receiver was set to 1.2.
It is possible to raise the power above V or develop a dedicated melody IC, but the former would shorten the battery life, and the latter would lead to an increase in the price of the melody IC and receiver. I didn't like it.

(Problems to be Solved by the Invention) As described above, in the conventional selective call receiver, when the melody sound generation circuit is forgotten to be attached or a poor contact occurs, or when the battery voltage drops, the melody sound generation circuit does not operate. There is a problem that if the voltage falls below the guaranteed voltage, the call will not be made.The present invention takes this point into account and can reliably notify the occurrence of a call even when the melody sound generation circuit is inoperable. It is an object of the present invention to provide a selective calling receiver that can improve operational reliability.

[Structure of the Invention] (Means for Solving the Problems) As shown in FIG. 1, the present invention provides, in addition to a ringing tone selection means for selecting a ringing tone and a melody tone, an operation determination means for a melody tone generation circuit. A is provided, and when a melody tone is selected by the ring tone selection means, the operation determination means A performs an operation test of the melody tone generation circuit, and when it is determined that the predetermined operation is not performed, the ringing is performed. The sound is changed to a sound generated from a sound generation circuit.

(Function) As a result, even if the melody tone generation circuit becomes inoperable due to a poor contact when worn, a drop in battery voltage, etc. when the melody tone is selected and specified by the ring tone selection circuit, this The inoperable state is detected by the operation determining means A, and the ringing tone is changed to a ringing tone. Therefore, when a call occurs, the occurrence of a ringing is notified by the ringing sound, thereby ensuring a reliable ringing notification. becomes possible.

(Embodiment) FIG. 2 is a circuit block diagram showing the configuration of a selective call receiver in an embodiment of the present invention. This receiver includes a radio circuit section 2 that receives a selective calling signal sent from a base station via an antenna 1 in a receiving circuit 21 and then demodulates it in a demodulation circuit 22, and a control circuit section 3 composed of an integrated logic circuit. and a selection switch 4 for selecting and specifying the type of ring tone.
It is comprised of a ringing tone generator 5 consisting of an amplifier circuit 51 and a speaker 52, and a memory 32 consisting of a ROM that stores the individual number code of the own machine. Among these, the control unit 3 includes a code matching circuit 31 and a sound generation circuit 33 that generates a sound signal.
, an external connection connector 34, and a call control circuit 35, and a melody IC 6 as a melody sound generation circuit is attached to the external connection connector 34. The code matching circuit 31 matches the individual number code inserted in the selective call signal received by the radio circuit section 2 with the individual number code of the own machine stored in the memory 32, and determines whether the same code matches. When this happens, a match signal C8 is output to the call control circuit 35. The sound generation circuit 33 generates a sound signal in which a 2.6 kHz single tone signal is intermittent at 1.68Z.

By the way, the ring control circuit 35 is composed of a ring tone selection circuit 36, an operation determination circuit 37, and a gate circuit 38, as shown in FIG. 3, for example. Of these, the ring tone selection circuit 36 instructs the operation determination circuit 37 to determine the operation of the melody IC 6 when the code matching circuit 31 generates a match signal C8 with the selection switch 4 specifying a melody tone. If the result of this determination is that the melody lc6 is inoperable, a gate control signal is outputted to the gate circuit 38 to select a ringing tone, and the ringing signal output from the tone generation circuit 33 is used as a ringing tone. This signal is supplied to the ring tone generator 5. On the other hand, the operation determination circuit 37 supplies a trigger signal ("H" level) AS to the melody IC 6 when a determination command arrives from the ring tone selection circuit 36, and in response, the operation determination circuit 37 supplies the melody IC 6 with a trigger signal ("H" level) AS. It is determined from the signal level of the BS whether or not the melody IC 6 is operating normally, and the determination signal is sent back to the ring tone designation circuit 36.

With such a configuration, the selection switch 4 is set to the melody sound side, and in this state, when a call occurs to the own machine and the code matching circuit 31 outputs the matching signal C8,
At this point, the ringing tone selection circuit 36 outputs a determination command to the operation determination circuit 37. Then, the operation determination circuit 37 sends the trigger signal A to the melody IC 6 as shown in FIG.
s is output, and in this state, the signal level of the melody sound BS output from the melody IC 6 is monitored. If Melody IC6 is working normally now, Melody IC6
As shown in FIG. 4, the melody sound BS with a sufficiently high signal level is output from the melody sound BS.
7 determines that the melody IC 6 is normal and sends the result back to the ring tone selection circuit 36. Incidentally, since there are variations in the activation time of the melody IC 6, the operation determination circuit 37 determines the signal level at the time when the time T1 during which the melody IC 6 is reliably in the operating state has elapsed after outputting the trigger signal As. When a signal indicating that the ring tone is normal is returned, the ring tone selection circuit 36 sends a signal to the gate circuit 38.
The gate control signal of the melody IC 6 is outputted to open the AND gate on the side of the melody IC 6, thereby supplying the melody tone as a ring tone to the ring tone generator 5. Therefore, a melody tone is generated from the speaker 52, thereby notifying the subscriber of the occurrence of a call.

On the other hand, if the melody IC 6 is not securely attached to the external connection connector 34 or the battery voltage has dropped below 1 to 2 V, which is the guaranteed operation voltage of the melody IC 6, the operation determination circuit 37 Even after a certain period of time T1 has elapsed since the trigger signal As was output, the melody IC 6 still outputs the melody sound 8 with a sufficiently high signal level.
8 is not generated. Therefore, the operation determination circuit 37 determines that the melody IC 6 is inoperable and sends a signal to that effect back to the ring tone selection circuit 36. Then, the ringing tone selection circuit 36 outputs a gate control signal of the it H++ level to the gate circuit 38 to open the AND gate on the ringing tone generation circuit 33 side. As a result, the ringing signal output from the ringing tone generating circuit 33 is supplied to the ringing tone generating section 5,
A sound is generated from the speaker 52 to notify the subscriber of the occurrence of a call.

In this embodiment, when a melody tone is specified by the selection switch 4, the operation determination circuit 37 determines the operating state of the melody IC 6, and the ring tone is changed to a melody tone according to the determination result. Since the melody IC 6 can be set to make a call or a sound, a sound will be generated instead of the melody sound when the melody IC 6 is inoperable, and as a result, the occurrence of a call will be reliably notified. be able to. Therefore, there is no need to raise the low voltage alarm generation level of the receiver, and there is no need to prepare a dedicated melody IC with a low guaranteed operation voltage, so it is possible to extend battery life and use a general-purpose melody IC. A receiver can be provided.

It should be noted that the present invention is not limited to the second embodiment.

For example, in the case of a receiver whose main operations such as code matching are performed by a microprocessor, the operation determination means may be installed in this microprocessor. Various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, in addition to the ringing tone selection means for selecting a ringing tone and a melody tone, a means for determining the operation of the melody tone generation circuit is provided, and the ringing tone selection means When the melody sound is selected, the operation determination means performs an operation test of the melody sound generation circuit, and when it is determined that the predetermined operation is not performed, the ring tone is changed to the sound generated from the ringtone generation circuit. By changing the sound to a sound, it is possible to reliably notify the occurrence of a call even when the melody sound generation circuit is inoperable, thereby providing a selective call receiver that can improve operational reliability. .

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a circuit block diagram showing the configuration of a selective call receiver in an embodiment of the present invention, and FIG. 3 is the configuration of the call control circuit of the receiver. FIG. 4 is a signal waveform diagram used to explain the operation of the circuit. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Radio circuit section, 3... Control circuit section, 31... Code checking circuit, 32... Memory for individual number code storage, 33... Sound generation circuit , 34・
・・Connector for external connection, 35 ・・Call control circuit, 3
6...Ring tone selection circuit, 37...Operation determination circuit, 3
8... Gate circuit, 4... Selection switch, 5...
Ringing tone generator, 6... melody IC.

Claims (1)

[Claims] In addition to having a built-in ringing tone generation circuit, the device also includes a terminal to which a melody tone generation circuit is attached, and a ringing tone selection means for selecting either the ringing tone or the melody tone as a ringing tone, and generates a call to the own machine. In a selective calling receiver that outputs a ring tone or a melody tone selected by the ring tone selection means as a ring tone when a melody tone is selected by the ring tone selection means, the melody tone generation circuit A selective call receiver comprising an operation determining means for changing the ringing tone to a ringing tone generated from the ringing tone generation circuit when it is determined that a predetermined operation is not performed after performing an operation test.