JPH0520936B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to an audio device with an alarm/broadcast switching function, and in particular, to an audio device that is capable of broadcasting at any time even when an alarm sound is sounding, and that can return to sounding the alarm sound even after the broadcast ends. This article relates to a sound device with an alarm/broadcast switching function that can be used. [Technical Background of the Invention and Problems Thereof] Conventionally, this type of acoustic device with an alarm/broadcasting function has a warning acoustic device 40 as shown in FIG. 5a.
and a broadcasting sound device 41 are installed separately, so that the alarm speaker SP ₁ and the broadcasting speaker SP ₂ operate independently. In addition, as shown in Figure 5b, one speaker
Alarm acoustic device 4 whose SP includes an alarm amplifier AMP
There is a system that can be switched between 2 and broadcasting using relay Ry. However, in the configuration shown in Fig. 5a, even if the warning sound and the broadcast sound are sounded simultaneously, the content of the broadcast sound is canceled out by the alarm sound, and therefore the meaning of the broadcast is half destroyed, and the effectiveness of the broadcast is reduced. In order to obtain this, the alarm sound must be stopped (Figure 6: Broadcast ON, Alarm ON). In addition, in the configuration shown in FIG. 5b, the speaker is always connected to the broadcasting side and ready for broadcasting, and in the event of an alarm, the relay is activated by the alarm control signal, and the speaker is switched to the alarm side.
An alarm sounds. Since broadcasting is not possible while this alarm is sounding, its utility value is halved. If you are forced to broadcast, you must return the alarm to the inactive state before broadcasting (see 6th
Figure broadcast SP, alarm SP). If such an operation is performed, there is a problem that it will not be possible to issue a re-warning when the broadcast ends (Japanese Patent Publication No. 11444/1983, Utility Model No. 11444/1983)
-038494 (Utility Model Application Publication No. 55-138851) Microfilm). [Object of the Invention] The present invention has been made to solve the above-mentioned difficulties.It is possible to sound an alarm even during broadcasting, to broadcast at any time even when the alarm is sounding, and to issue the alarm again even after the broadcast ends. It is an object of the present invention to provide an audio device with an alarm/broadcast switching function that can return to sound. [Summary of the Invention] In order to achieve the above object, according to the acoustic device with an alarm/broadcast switching function of the present invention, the alarm sound signal or the broadcast signal is switched to the alarm side or the broadcast side by the switching means and inputted. an alarm signal detection circuit including a speaker that sounds when the alarm is activated, a one-shot multivibrator that detects each signal from the sensor and outputs a time-limited alarm signal to generate an alarm sound signal; a broadcast control signal detection circuit including an oscillator that oscillates an alarm sound signal when triggered by an alarm signal from the broadcast control signal, and a one-shot multivibrator that detects a control signal that controls the broadcast signal and outputs a time-limited broadcast control signal; An alarm signal from the alarm signal detection circuit and a broadcast control signal from the broadcast control signal detection circuit are input, and when an alarm signal is input during broadcasting, a logic output is output that gives priority to the input of the alarm signal, and broadcasting is performed during the alarm. A priority logic circuit including a flip-flop that outputs a logic output based on a broadcast control signal when a control signal is input, and a switching means that is alerted by a logic output from the priority logic circuit when an alarm signal is input to the priority logic circuit during broadcasting. When the broadcast control signal is input to the priority logic circuit during an alarm, the switching means is switched to the broadcast side by the logic output from the priority logic circuit.If the control signal disappears during the alarm, the switching means is switched to the alarm side. and a switching control circuit including a transistor for switching back to the side. [Embodiments of the Invention] Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the acoustic device with an alarm/broadcast switching function according to the present invention is a speaker which is sounded by switching an alarm sound signal W or a broadcast signal S to the alarm side or the broadcast side, respectively, by a switching means 10 and inputting the alarm sound signal W or the broadcast signal S. Time-limited alarm signals A, B for detecting each signal A ₀ , B ₀ from the SP, fire sensor, and gas leak sensor (not shown) and generating an alarm sound signal.
an oscillator 16 that is triggered by the alarm signal from the alarm signal detection circuit and oscillates an alarm sound signal, and a control signal _C0 that controls the broadcast signal to detect and control the broadcast for a limited time. When the broadcast control signal detection circuit 12 that outputs signal C, the alarm signals A and B from the alarm signal detection circuit, and the broadcast control signal C from the broadcast control signal detection circuit are input, and the alarm signal is input during broadcasting. A priority logic circuit 13 outputs a logic output H that gives priority to the input of the alarm signal, and outputs a logic output L that gives priority to the input of the broadcast control signal when the broadcast control signal is input during the alarm; is input to the priority logic circuit, the switching means is switched to the alarm side by the logic output H from the priority logic circuit, and when the broadcast control signal is input to the priority logic circuit during the alarm, the logic output L from the priority logic circuit switches the switching means to the alarm side. It is equipped with a switching control circuit 14 which switches the switching means to the broadcasting side and switches the switching means again to the alarming side if the control signal _C0 disappears during the alarm. The switching control circuit 14 controls the relay switching contact 10 by means of a relay 15 . The oscillator 16 is triggered by alarm signals A and B from the alarm signal detection circuit 11, and the oscillation signal is applied to the amplifier 17 as an alarm sound signal W. To explain this alarm/broadcast switching in detail, as shown in FIG. resistance
R ₁ is connected between the capacitor C ₁ and the capacitor C ₂ , and when the relay switching contact 10a is switched to the alarm side shown by the broken line, the amplifier 17 is connected to the speaker SP via the resistor R ₃ . Terminals SIGA and SIGB to which broadcast signal S is applied are relay switching contacts 10
When b and 10c are switched to the side shown by the solid line, the transformer T is connected to the speaker SP via the resistor _R3 . Furthermore, when the relay switching contacts 10b and 10c are switched to the side shown by the broken line, the terminals SIGA and SIGB are connected to a terminal impedance consisting of a capacitor C ₃ , a resistor R ₄ and a capacitor C ₄ . Specific examples of the alarm signal detection circuit 11, broadcast control signal detection circuit 12, priority logic circuit 13, switching control circuit 14, and relay 15 shown in FIG. 1 will be described with reference to FIG. This alarm signal detection circuit 11 includes a fire sensor,
Each signal A ₀ from a gas leak sensor (not shown),
_B0 is taken into the central processor unit (CPU), and from its output terminals OUT1 and OUT2 via transistors _Tr1 and _Tr2 , the NOR circuit 20-21,
It is added to one-shot multivibrators OMV ₁ and OMV ₂ constituted by the intervention of CR series circuits 22 and 23 and input/output feedback, and outputs time-limited alarm signals A and B. This output is NOR circuit 2
4 is applied. p and q are connected to a fire indicator light circuit and a gas leak indicator light circuit (not shown) for fire signal A and gas leak signal B, respectively. The broadcast control signal detection circuit 12 is a terminal to which an AC control signal _C0 for controlling the broadcast signal S is applied.
CONT, GND is connected between diode D ₂ , resistor R ₅ , and capacitor C ₅ , and is connected from between diode D ₂ and resistor R ₅ to transistor Tr ₃ via diode D ₁ and resistor R ₆ . D ₁ and resistance R ₆
Between them is a capacitor C ₆ , a resistor R ₆ and a transistor Tr ₃
A resistor R ₇ is connected in parallel between the bases of each. The collector of this transistor Tr ₃ is connected to Vcc through a resistor R ₈ and a resistor R ₉ . Resistance R ₈ , resistance R ₉
It is connected to the base of the transistor Tr ₄ from between, and its collector is connected from the resistor R ₁₀ to the emitter of the transistor Tr ₃ . The collector of the transistor _Tr4 is applied to a one-shot multivibrator _OMV3 constituted by the intervention of a CR series circuit of NOR circuits 31-32 and input/output feedback, and outputs a time-limited broadcast control signal C. This broadcast control signal C is applied to the NAND circuit 25 together with the output of the NOR circuit 24. The priority logic circuit 13 consists of a NAND circuit 26 to which the output from the NOR circuit 24 is applied, and a NAND circuit 27 to which the output from the NAND circuit 25 is applied, and is configured by feeding back input and output to each other. It constitutes a flip-flop FF. This priority logic circuit 13 receives the alarm signals A and B from the alarm signal detection circuit 11 and the broadcast control signal C from the broadcast control signal detection circuit 12, and
When alarm signals A and B are input during broadcasting, outputs a logical output H that gives priority to the input of alarm signals A and B,
Broadcast control signal C is input during alarm, logic output L
This outputs the following. The truth table of this flip-flop FF is expressed as the alarm signal A from the one-shot multivibrator,
Table 1 shows parameters B, broadcast control signal C, and output D from flip-flop FF.

[Table] θ: Previous state Output D is applied from resistor _R11 to the base of transistor _Tr5 , and resistor _R12 is connected between the base and emitter of transistor _Tr5 . The collector is connected to Vcc by a relay 15. On the other hand, resistor R ₈ is applied to the base of transistor Tr ₆ through resistor R ₁₄ , whose base is connected to resistor
It falls to ground via _R13 , and its collector is connected to relay 15. In the acoustic device with an alarm/broadcast switching function configured in this way, an AC control signal C ₀ (for example, 500 Hz
~2KHz, Vpp=6~20v) is applied from the terminals CONT and GND of the broadcast control signal detection circuit 12, the DC component is cut off by the capacitor _C5 , and then connected to the diode _D1 , diode _D2 , and capacitor via the resistor _R5 . Transistor rectified by C ₆ and through resistor R ₆
Transistor Tr ₃ turns on as a bias source for Tr ₃
do. When transistor Tr ₃ is turned on, transistor Tr ₄ is biased and one-shot multivibrator OMV ₃ is operated. The time-limited broadcast control signal C from this one-shot multivibrator OMV ₃ has a logic output of H level, a fire signal A ₀ ,
If there is no gas leak signal B ₀ , the one-shot multivibrator OMV ₁ of the alarm signal detection circuit 11,
Since the logic outputs of alarm signals A and B from OMV ₂ are at L level, NOR circuit 24 and NAND circuit 2
5. Due to the flip-flop FF, as is clear from the above truth table of the flip-flop FF, the output D becomes the logic output L, and the transistor Tr ₅ becomes
OFF, the relay 15 is not operated, and the relay switching contacts 10a, 10b, 10c are on the broadcasting side (second
(solid line in the figure). In this state, the broadcast signal S
When applied to the terminals SIGA and SIGB, broadcast sound is emitted from the speaker SP via the resistor _R3 from the transformer T (Figure 4a). In this manner, the broadcast control signal detection circuit 12 detects the control signal C ₀ , outputs a limited-time broadcast control signal C, and controls the broadcast signal S to be emitted from the speaker SP. During this broadcast, a signal A ₀ from at least one of a fire sensor and a gas leak sensor (not shown),
_B0 is taken into the central processor unit (CPU), and from its output terminals OUT1 and OUT2 is passed through transistors _Tr1 and _Tr2 to the NOR circuit 20-2.
1, 22-23 one-shot multivibrators OMV ₁ and OMV ₂ . One-shot multivibrator of alarm signal detection circuit 11
Due to the nature of the one-shot multivibrator, when the output from OMV ₁ and OMV ₂ is a fire signal A ₀ or a gas leak signal B ₀ , the logic output becomes H level for a limited time, and the output alarm signals A and B are output from OMV 1 and OMV 2. teeth
Applied to NOR circuit 24, flip-flop FF
From the above truth table, the logic output of output D becomes H, transistor Tr ₅ turns ON, and relay 15
operates, and relay switching contacts 10a, 10b, 10
c is switched to the alarm side (broken line in FIG. 2).
Therefore, the oscillator 16 is triggered by the alarm signal A or B from the alarm signal detection circuit 11, and the oscillation signal is applied to the amplifier 17 as an alarm sound signal W, and an alarm sound is sounded from the speaker SP.
In this way, the alarm signal detection circuit 11 detects the fire signal.
A ₀ or gas leak signal B ₀ is detected and alarm signal A
Or B is output and an alarm sound signal W is emitted from the speaker SP (Fig. 4b). If you wish to broadcast during this alarm, apply the AC control signal C ₀ again from the terminal CONT and GND from the main controller or sub-controller (not shown).
The broadcast control signal C from the one-shot multivibrator OMV ₃ of the control signal detection circuit 12 has a logic output of H level, and is a fire signal A ₀ and a gas leak signal.
Even if B ₀ exists, the one-shot multivibrators OMV ₁ and OMV ₂ of the alarm signal detection circuit 11 have a logic output of L after the above-mentioned time limit has elapsed due to their nature, so it is clear from the above truth table of the flip-flop FF. As shown, the logical output of output D is L, and
Transistor Tr ₅ is turned OFF, the operation of relay 15 is canceled, and relay switching contacts 10a, 10b,
10c switches to the broadcasting side (solid line in FIG. 2). In this state, broadcast signal S is connected to terminals SIGA and SIGB.
In addition to this, broadcast sound is emitted from the speaker SP from the transformer T via the resistor _R3 (Fig. 4c). At this time, by operating the main controller or sub-controller (not shown) to stop the broadcast,
AC control signal applied from terminal CONT, GND
When C ₀ disappears, the transistor Tr ₃ of the control signal detection circuit 12 is turned off, and the transistor Tr ₆ of the switching control circuit 14 is biased from Vcc.
When the relay 15 operates, the relay switching contact 10a,
10b and 10c are the alarm side (broken line in Figure 2)
Then, the alarm signal W is emitted from the speaker SP (Fig. 4d). In this way, even after the broadcast ends, the alarm sound can be returned to sounding again. That is, alarm signal A, alarm signal B, and broadcast control signal C are all one-shot multivibrators.
Output from OMV ₁ , OMV ₂ , OMV ₃ , NAND circuit 25, flip-flop
As is clear from the above truth table of the flip-flop FF, when the alarm signal A and the alarm signal B are the logic output H, the output D becomes the logic output H, and the alarm signal A and the alarm This is a logic circuit that gives priority to the input of the alarm signals A and B over the broadcast control signal C, in which when both the signal B has a logic output L and the broadcast control signal C has a logic output H, the output D becomes a logic output L. As a result, even if the one-shot multivibrator outputs of the broadcast control signal C, alarm signal A, and alarm signal B are input at the same time, the output D becomes H. When the output D becomes H, the transistor Tr ₅ of the switching control circuit 14 is driven, and the relay 1 is activated.
5 operates and switches the speaker SP to the alarm sound side. When the output D becomes L, the transistor Tr ₅ of the switching control circuit 14 turns OFF and switches the speaker SP to the broadcasting side, but if there is no control signal C ₀ at this time, the transistor Tr ₆ of the switching control circuit 14 turns OFF.
ON, relay 15 operates and the speaker SP is switched to the alarm sound side again. Therefore, relay 15
It becomes OFF when both the transistor Tr ₅ and the transistor Tr ₆ of the switching control circuit 14 are OFF, and only when the control signal C ₀ is present and the alarm signals A and B are not received after that. In this case, the speaker SP is switched to the broadcast side. Table 2 shows the status of the above device, the operation of the relay 15, and the status of the speaker SP.

[Table] In the above examples, relays and relay switching contacts were used as the switching means and the switching control circuit that controls the switching means, but solid-state devices can also be used. [Effects of the Invention] As is clear from the above embodiments, according to the acoustic device with the alarm/broadcast switching function of the present invention, the alarm sound signal or the broadcast signal can be sent to the alarm side or the broadcast side, respectively, by the switching means. An alarm signal detection circuit includes a speaker that sounds when switched and input, and a one-shot multivibrator that detects each signal from the sensor and outputs a time-limited alarm signal to generate an alarm sound signal; Broadcast control signal detection including an oscillator that is triggered by an alarm signal from a signal detection circuit and oscillates an alarm sound signal, and a one-shot multivibrator that detects a control signal that controls the broadcast signal and outputs a time-limited broadcast control signal. The circuit receives an alarm signal from the alarm signal detection circuit and a broadcast control signal from the broadcast control signal detection circuit, and outputs a logical output that gives priority to the input of the alarm signal when the alarm signal is input during broadcasting;
A priority logic circuit including a flip-flop that outputs a logic output according to the broadcast control signal when a broadcast control signal is input during an alarm, and a logic output from the priority logic circuit when an alarm signal is input to the priority logic circuit during a broadcast. It includes a transistor that switches the switching means to the alarm side and switches the switching means to the broadcast side by a logic output from the priority logic circuit when a broadcast control signal is input to the priority logic circuit during the alarm, and when the control signal disappears during the alarm. By being equipped with a switching control circuit including a transistor that switches the switching means back to the alarm side, the alarm can be sounded during broadcasting.
To enable broadcasting at any time even during the sounding of an alarm sound, and to return to sounding the alarm sound even after the broadcast ends.

[Brief explanation of drawings]

FIG. 1 is a system block diagram of an audio device with an alarm/broadcast switching function according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the alarm/broadcast switching section of FIG. 1, and FIG. 3 is an alarm/broadcast switching section of FIG.・Partial detailed circuit diagram of the acoustic device with broadcast switching function; FIG. 4 is a timing chart of the acoustic device with alarm/broadcast switching function; FIGS. 5 a and b are block diagrams of the conventional alarm/broadcast acoustic device; FIG. 6 is a timing chart of the audio device. W...Alarm sound signal, S...Broadcast signal, A ₀ , B ₀
...Each signal from the sensor, A, B...Alarm signal, _C0 ...Control signal, C...Broadcast control signal, SP
...Speaker, 10, 10a, 10b, 10c...
...Switching means, 11...Alarm signal detection circuit,
OMV ₁ , OMV ₂ ...One-shot multivibrator, 12...Broadcast control signal detection circuit, Tr ₃ ...
Transistor, OMV ₃ ...One-shot multivibrator, 13...Priority logic circuit, FF...Flip-flop, 24...NOR circuit, 25...
NAND circuit, 14...Switching control circuit, 15...
Relay, Tr ₅ , Tr ₆ ...Transistor, 16...
oscillator.

Claims (1)

[Claims] 1 Switching means 1 for switching alarm sound signal W or broadcast signal S
0, 10a to 10c, the speaker SP is sounded by switching to the alarm side or broadcasting side, respectively, and each signal A ₀ , B ₀ from the sensor.
an alarm signal detection circuit 11 including one-shot multivibrators OMV ₁ and OMV ₂ that output time-limited alarm signals A and B for detecting and generating the alarm sound signal; an oscillator 16 that is triggered by an alarm signal and oscillates the alarm sound signal; and a time-limited broadcast control signal C that detects a control signal _C0 that controls the broadcast signal.
One-shot multivibrator that outputs
A broadcast control signal detection circuit 12 including OMV ₃ , alarm signals A and B from the alarm signal detection circuit, and broadcast control signal C from the broadcast control signal detection circuit are input, and the alarm signal is input during broadcasting. Logic outputs D and H give priority to the input of the alarm signal when
a priority logic circuit 13 including a flip-flop FF which outputs logical outputs D and L according to the broadcast control signal when the broadcast control signal is input during an alarm; When the broadcast control signal is input to the priority logic circuit during the alarm, the switching means is switched to the alarm side by the logic outputs D and H from the priority logic circuit, and when the broadcast control signal is input to the priority logic circuit during the alarm, the logic output from the priority logic circuit is A switching control circuit 1 including a transistor Tr ₅ that switches the switching means to the broadcast side by outputs D and L, and a transistor Tr ₆ that switches the switching means to the alarm side again if the control signal C ₀ disappears during an alarm.
4. An audio device with an alarm/broadcast switching function characterized by comprising: