JPH068997B2 - Chime sound generation circuit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a chime sound generation circuit, and in particular, a simple circuit is a chime sound generation circuit that generates a chime sound composed of continuous first and second audible signals. Regarding

[Technical Background of the Invention and its Problems] As shown in FIG. 7, the conventional chime sound generation circuit has a non-lock call button 34, a control circuit 35, an oscillator 36,
39, attenuation circuits 37 and 40, amplifier 38, speaker 41
It is composed of. When the call button 34 is pressed, the terminal 3
When a signal is input via 5c, the continuous first and second
A chime sound including an audible signal is transmitted from the speaker 41. The number of times the chime sound is transmitted is controlled by the control circuit 35. Further, the start-up and recovery of the oscillator 36 and the start-up and recovery of the oscillator 39 are controlled by the terminals 35a and 35b of the control circuit 35.
Through. The first audible signal generated by the oscillator 36 is attenuated by a predetermined attenuation curve of the attenuation circuit 37. When the oscillator 36 is restored, the oscillator 39 is activated by the control circuit 35. The second audible signal generated by the oscillator 39 is attenuated by a predetermined attenuation curve of the attenuation circuit 40. First, second
A chime sound "pin" and "pon" composed of an audible signal is emitted from the speaker 41.

Since the control circuit of this conventional chime sound generating circuit is configured by wiring logic such as a monostable multivibrator, it has drawbacks such as a complicated circuit and a large number of parts.
Further, there is a defect that the restoration control of the first audible signal and the activation control of the second audible signal become irregular, and the sense of the chime sound is impaired.

Therefore, a program of the microcomputer outputs a pulse train corresponding to "pin, pon" and a pulse of an audio frequency from the first and second output terminals thereof, adds the pulse train to an integrating circuit, and outputs the pulse train to the first transistor. An electronic chime is known in which a desired voltage envelope corresponding to a duty ratio is formed and synthesized by amplitude modulation in a second transistor to generate a "pin, pong" timbre (Japanese Patent Publication No. 59-11119). ). In addition, a pair of transistors and a pair of capacitors are used, and an envelope is formed by the difference between the reference voltage and the terminal voltage due to the charging current of each capacitor. Modulate (synthesize) in the circuit, "pin, pong"
There is also known a chime sound signal generating circuit for generating each chime sound (micro film of Japanese Utility Model Application No. 56-149845 (Japanese Utility Model Application No. 58-54698)).

However, in the former case, the circuit for forming the rectangular wave of the microcomputer and the envelope forming circuit, as well as the combining circuit by amplitude modulation are complicated, and in the latter case, each transistor and capacitor must be provided independently. Moreover, there is a problem that a modulation (synthesis) circuit is required, and the whole circuit becomes complicated.

[Object of the Invention] The present invention has been made in view of the above-mentioned points.
It is an object of the present invention to provide a chime sound generation circuit capable of generating a chime sound having an excellent sense of feeling with a simple circuit by calculating the frequency and transmission time of an audible signal by a program.

[Summary of the Invention] In order to achieve this object, a chime sound generation circuit according to the present invention calculates a first rectangular wave having a predetermined cycle, and after a predetermined time has elapsed, a prediction different from this cycle is performed. The rectangular wave calculating means for calculating the second rectangular wave having a predetermined cycle, and the capacitor charged with the H level of the first rectangular wave generated by the calculation of the rectangular wave calculating means are charged with the L level of the first rectangular wave. Charging means for interrupting charging, discharging means for discharging the capacitor at the L level of the second rectangular wave generated by the operation of the rectangular wave calculating means, and interrupting discharge at the H level of the second rectangular wave, and charging means And a control means for controlling the operation of the discharging means, and an output means for outputting a chime sound composed of a first audible signal generated by charging the capacitor and a second audible signal generated by discharging.

[Embodiment of the Invention] An embodiment of a chime sound generation circuit according to the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 is a common control unit provided as control means. The common control unit 1 has a CPU 4, a ROM 5, and a RAM 6, and through the data bus 7 and the cable drivers 8a to 8g, the terminals PL ₀ , PL ₁ , PL ₂ , PH ₁ , PH ₂ , PH ₂ , P.
It controls F ₁ and PF ₂ . Normally, the terminal PL ₀ is at L level. When the first rectangular wave is transmitted to the terminal PF ₁ , the terminal PL ₁ is at L level and the terminal PH ₁ is at H level. When the second rectangular wave is being sent to the terminal PF ₂ , the terminal PL ₂ is at L level and the terminal PH ₂ is at H level.

A rectangular wave calculation program 15 shown in FIG. 2 is provided as a rectangular wave calculation means. The rectangular wave calculation program 15 is a periodic program and is started every 102 μS when controlled by an execution management program (not shown), and returns from the connector 25. The rectangular wave calculation program 15 uses the register memory RGM and the register table RETn (n is 0 to 5) shown in FIG. The register memory RGM is provided in the RAM 6 shown in FIG. 1 and has a 1-word configuration with 0 to 11 bits being a register RG ₂ and 12 to 17 bits being a register RG.
₁ and 31 bits are flag FLG (hereinafter, simply RGM, R
G ₁ , RG ₂ , and FLG). Register table RET ₀ is "14", RET ₁ is "7", RET ₂ is "18",
"9" is written in RET _3, "490" is written in LET ₄ , "1677" is written in RET ₅ and the register table RETn is the ROM shown in FIG.
It is provided in 5. When the rectangular wave calculation program 15 is executed, the judgment box 16 judges whether to calculate the first rectangular wave or the second rectangular wave. Also, the judgment boxes 16a, 16b
It is determined whether or not the numerical value of RG ₁ is "0". When it is "0", 1 is added to the numerical values of RG ₁ and RG _{2 in} processing 17 and 19. When 1 is added to RG ₁ , the first rectangular wave setting process is executed in process 23a. First in the first square wave setting process
The terminal PA of the terminal board 2 shown in the figure becomes H level. RG ₁
Since the numerical value of RG ₁ is “1” at this time, the numerical value of RG ₁ is not “0” in the next cycle (first counting from the 0th), and therefore the determination box 16a transits to processing 17a and thereafter.
When the numerical value of RG ₁ is "7", the first rectangular wave reset process is executed in process 32b. The terminal PA becomes L level in the first rectangular wave reset process. If the numerical value of RG ₁ becomes 14 or more, the numerical value of RG ₁ is set to “0” in processing 18b.
When the rectangular wave calculation program 15 is executed in the second cycle, the processing transits again to the processing 17 and thereafter. 490 the first square wave
When it is sent out, the FLG is activated in process 21, and R
Initialize G ₂ . Judgment box 1 in the next cycle
Second rectangular wave set processing and second
Performs rectangular wave reset processing. In the second rectangular wave setting processing, the terminal PB is set from H level to L level as shown in FIG. 4, and in the second rectangular wave reset processing, the terminal PB is reset from L level to H level. The time from setting to resetting is determined by the numerical value of RG ₁ , and the judgment is made by referring to the data 9 of RET ₃ shown in FIG. 3 in the judgment box 27a. The number of times the second rectangular wave is transmitted is determined by the RET ₅ data 16
The decision box 29 is determined with reference to 77. When the second rectangular wave is sent 1677 times, the sending operation of the second rectangular wave is completed, and the register memory RGM is set to all in processes 31a, 31b, and 31c.
Initialize to "0" and pass control to the execution management program via the connector 25a.

In FIG. 1, the charging means for charging the capacitor with the first rectangular wave is composed of a diode D ₁ , a capacitor C ₁ , a diode D ₃ and resistors R ₃ and R ₄ . Diode D ₁ is terminal PF 1 of the common control unit 1 _receives the terminal PA 1 of the terminal plate _3, the first rectangular wave that has passed through the terminal PA of the terminal plate 2 to the anode, the capacitor C ₁ at the H level of the first rectangular wave Charge the
Charging is interrupted at the L level of the first rectangular wave. Thus, the capacitor C ₁ is charged to generate a chime sound including the first audible signal.

The discharging means for discharging the electric charge charged in the capacitor C ₁ by the second rectangular wave is the capacitor C ₁ , the resistor R ₂ , and the diode D.
It consists of ₂ . The electric charge charged in the capacitor _{C 1} resistor _{R 2,} a diode _{D 2,} the terminal PB of the terminal plate 2, the terminal PB ₂ of the terminal plate 3, the second rectangular wave having passed through the terminal PF ₂ of the common control unit 1 L level And discharge at the H level of the second rectangular wave. Thus, the discharge of the capacitor C ₁ produces a chime sound composed of the second audible signal.

The output means for outputting the chime sound composed of the first audible signal generated by charging the capacitor C ₁ and the second audible signal generated by discharging is composed of the amplifier 10 and the speaker 11. The chime sound output to the terminal PD is sent to the amplifier 10 and the speaker 11 via the capacitor C ₂ .

The numerical value of the register table RETn is not limited to the above embodiment. Further, in the above embodiment, 1 word 3
Although the description has been made with 2 bits, the number of bits is not limited to 32. Depending on the type of CPU, eight CPUs each having a word of 4 bits may be used.

[Operation of the Invention] In the chime sound generating circuit configured as described above, when the call button 12 shown in FIG.
The signal via the terminal PS, the cable receiver 9 and the data bus 7 is detected by the CPU 4. The signal of the call button 12 outputs the "0" th first rectangular wave to the terminal PA shown in FIG. 4 (b) at the time t ₀ shown in FIG. 4 (a). At time t ₀ , the terminal PB in FIG. 4 (c) becomes H level by the terminal PH ₁ of the common control unit 1 in FIG. Since the first rectangular wave is sent from the 0th to 489th by the rectangular wave calculation program 15 in FIG. 2, the time τ ₁ between the time points t _{0 to} t _{1 in} FIG. 4 is 74.
It will be 9.7 mS. Since the second rectangular wave is transmitted from the 0th to the 1676th, the time τ ₂ from time t _{1 to} time t _{2 in} FIG. 4 is 3250.
It becomes mS. The period of the first rectangular wave is 102 μS × 15 = 1.53 mS, and the period of the second rectangular wave is 102 μS × 19 = 1.938 mS. The duty of the first rectangular wave is 102 μS × 7 = 0.714 mS, and the duty of the second rectangular wave is 102 μS × 9 = 0.918 mS. The frequency of the first rectangular wave is 653.59 Hz, and the frequency of the second rectangular wave is 516 Hz.

FIG. 5 shows the characteristics of the capacitor C ₁ during charging. When the “0th” first rectangular wave is transmitted, Δt is output from the terminal PA.
_After "H" is output for ₁ hour, "L" is output for Δt ' ₁ hour. At this time, the terminal PB is "H" and the terminal PC is "L". When “H” is output from the terminal PA for Δt ₁ hour, the resistance R ₁ , the diode D ₁ ,
A combined resistance of the capacitor C ₁ and the resistors R ₄ and R ₃ (hereinafter referred to as R ₄
The current flows through (denoted as // R ₃ ). At this time, the capacitor C ₁ is charged for the time Δt ₁ as shown in FIG. In the subsequent Δt ′ ₁ hour, “L” is output from the terminal PA, and the current passes through the resistor R ₁ and the terminal PA.
Flow into the diode D ₁ , the capacitors C ₁ and R ₄
// to _{R 3,} the current does not flow. This operation is τ ₁ hour (74
9.7m) Repeatedly, R ₄ // between the terminal PD and the reference potential point
It becomes the voltage across R _3, as shown in Figure 5. The electric charge charged in the capacitor C ₁ becomes the voltage Vc shown in FIG. 5 at time t ₁ . When the voltage generated at R ₄ // R ₃ is output to the speaker 11, the first rectangular wave (Δt ₁ + Δt ′ ₁ )
The first audible signal with the frequency of 653.59HZ is output. After elapse of τ ₁ hour, the second rectangular wave (Δt ₂ + Δt ′ ₂ ) is output to the terminal PB at time t ₁ . At this time, the terminal PA is "L",
The terminal PC becomes "H". The terminal PB is Δt shown in FIG.
“L” is output only for ₂ hours, and then “H” is output for Δt ′ ₂ hours. By setting the terminal PA to “L”, the current from the power source + B flows through the resistor R ₁ to the terminal PA, and thus does not pass through the diode D ₁ . At this time, when the terminal PB becomes “L”, the electric charge charged in the capacitor C ₁ becomes the resistance R ₄ ,
It is discharged to the terminal PB through the resistor R ₂ and the diode D ₂ . When this operation is repeated for τ ₂ hours, a waveform due to the voltage across the resistor R ₄ is obtained as shown in FIG. 6, and the second audible signal is formed at the terminal PD. In addition, Δt ′ shown in FIG.
There is no change for ₂ hours.

[Effects of the Invention] As is clear from the above embodiments, according to the chime sound generation circuit of the present invention, the first rectangular wave of a predetermined cycle is calculated, and after a predetermined time has elapsed, this cycle A rectangular wave calculating means for calculating a second rectangular wave of a predetermined cycle different from the above, and a capacitor is charged with the H level of the first rectangular wave generated by the calculation of the rectangular wave calculating means, Charging means for interrupting the charging at the L level of the rectangular wave, and discharging the capacitor at the L level of the second rectangular wave generated by the calculation of the rectangular wave calculating means, and interrupting the discharge at the H level of the second rectangular wave. The discharging means, the control means for controlling the operation of the charging means and the discharging means, and the output means for outputting a chime sound composed of the first audible signal generated by charging the capacitor and the second audible signal generated by discharging. By having the first, Since the frequency and the number of times of transmission of the second rectangular wave can be calculated and determined based on the predetermined time data, the first and second
A simple circuit can be used to create a chime sound with excellent sound quality that consists of audible signals.

[Brief description of drawings]

1 is a block diagram showing an embodiment of a chime sound generation circuit according to the present invention, FIG. 2 is a flow chart of a rectangular wave calculation program provided in the chime sound generation circuit of FIG. 1, and FIG.
FIG. 4 is a data configuration diagram according to FIG. 2, FIGS. 4, 5, and 6 are waveform diagrams relating to the chime sound generation circuit of FIG. 1, and FIG. 7 is a block diagram of a conventional chime sound generation circuit. is there. 1 ... Common control unit (control means) 10 ... Amplifier (output means) 11 ... Speaker (output means) 15 ... Rectangular wave calculation program (rectangular wave calculation means) D ₁ ...... Diode C ₁ ...... Capacitor D ₃ ...... diodes R _{3, R 4} ...... resistance (charging means) _{D 2} ...... diodes C ₁ ...... capacitor R ₂ ...... resistor (discharge means)

Claims (1)

[Claims] 1. A first rectangle of a predetermined cycle in a call switch and a chime sound generation circuit for generating a chime sound composed of first and second audible signals which are continuous in accordance with the operation of the call switch. A rectangular wave calculating means for calculating a second rectangular wave having a predetermined cycle different from the cycle after calculating the wave and a predetermined time, and the rectangular wave calculating means generated by the calculation of the rectangular wave calculating means. Charging means for charging the capacitor at the H level of the first rectangular wave and interrupting charging at the L level of the first rectangular wave; and the charging means for the L level of the second rectangular wave generated by the operation of the rectangular wave operation means. Discharge the capacitor, the second
Discharging means for interrupting the discharge at the H level of the rectangular wave, control means for controlling the operations of the charging means and the discharging means, a first audible signal generated by charging the capacitor, and a second audible signal generated by the discharging. A chime sound generation circuit comprising: an output unit that outputs a chime sound composed of an audible signal.