JP3361991B2 - Voice alarm device and fire alarm system for apartment house using the voice alarm device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio alarm device for generating and outputting an audio signal for outputting an audio alarm, and a fire alarm system for an apartment house using the audio alarm device.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing the structure of a fire alarm system for an apartment house using a conventional voice alarm device. In this figure, the fire alarm system for apartment houses is
A fire detector 2 and a dwelling unit receiver 3 provided in each dwelling unit of the apartment building 1, a fire detector 2 provided in a common area such as a corridor in the apartment unit 1 and a speaker 4 for sounding an audio alarm. , An apartment house in the central management room, etc.
It is configured to include a residential building receiver 5 that centrally monitors disaster prevention information inside.

In a fire alarm system for an apartment house having such a configuration, when a fire sensor 2 is issued, a fire signal line L (for example, a fire signal) is emitted from a dwelling unit receiver 3 to which the fire sensor 2 is connected. Receiver 5 for residential building via line L1)
A fire signal is sent to. The residential wing receiver 5 that receives the fire signal transmits the district acoustic control signal line B (for example, to the residential unit receiver 3 of each dwelling unit on the floor where the fire detector 2 that has issued the alarm (that is, the fire floor) and the floor immediately above it. , The district sound control signal SB is transmitted via the district sound control signal lines B1 and B2). At the same time, two lines of audio signal lines KP-KPC (for example, audio signal lines KP1-KP
C1, KP2-KPC2) sends a voice signal to the speaker 4 installed in the common area on the fire floor and the floor directly above it to output a voice alarm, and notify the fire on the fire floor and the floor directly above it. . The dwelling unit receiver 3 is provided with an alarm means for outputting an audio alarm, and when the district sound control signal SB is input, an audio alarm is output from the speaker 7 constituting the alarm means, and the person inside the dwelling unit is notified. Notify you of a fire.

The receiver 5 for the residential building is provided with a voice alarm device 6 for ringing the speaker 4 in the common area. When a fire signal is captured, the voice alarm device 6 receives a fire representative signal FA, Fire area signal FAn (n = 1,2,
3, ...) and a district sound representative signal B that is a representative of the district sound control signal SB are input. When the fire district signal FAn indicating the fire floor is input to the voice alarm device 6 while the district sound representative signal B is input, the voice signal line KPn-KPCn on the fire floor is referred to by referring to a data table (not shown). The audio signal lines KPn + 1-KPCn + 1 on the immediately upper floor are selected and audio signals are output to each. Further, the residential ward receiver 5 is provided with a district sound stop switch 8 for stopping the voice alarm output from the residential unit receiver 3 and the speaker 4 in the common area. By operating the district sound stop switch 8, the district sound representative signal B and the district sound control signal SB are not output, and the voice alarm is not output from the dwelling unit receiver 3 and the speaker 4 of the common unit.

FIG. 4 is a block diagram showing the configuration of the voice alarm device 6. In this figure, the voice alarm device 6 includes an interface 10, a control circuit 11, a data file 12,
The audio file ROM 13, the audio synthesis circuit 14, the amplification circuit 15, the amplifier power supply control circuit 16, the speaker line control circuit 17, the relays K1 to K20, the short circuit protection circuit 18, and the power supply circuit 19 are provided.

The control circuit 11 is composed of an MPU and has an RO
Other circuits are controlled in accordance with the program stored in M and the combination data of voices stored in the data file 12 including a memory card, for example. That is, when the fire representative signal FA, the fire district signal FAn indicating the fire floor, and the district sound representative signal B are taken in through the interface 10, the voice synthesis circuit 14 is activated and the amplifier power supply control circuit 16 is operated to activate the amplification circuit 15. Then, a selection signal is supplied to the speaker line control circuit 17 to connect the speaker 4 in the common area on the fire floor and the speaker 4 in the common area on the floor immediately above it to the amplifier circuit 15. For connection of the speaker 4 in the common area, for example, when connecting the speaker 4 in the common area on the first and second floors, a signal for activating the relays K1 and K2 is supplied to the speaker line control circuit 17. Relay K1,
When K2 is activated, the corresponding short circuit protection circuit 1
8 and the speaker 4, the contacts k ₁ and k ₂ placed in the closed state are closed, and the speakers 4 and 4 on the first floor and the second floor are amplified by the amplifier circuit 15.
Connected to.

The voice synthesizing circuit 14 reads the voice data stored in the voice file ROM 13 after starting, performs digital signal processing on the voice data, and outputs a voice signal.
From the voice synthesizing circuit 14, for example, a voice signal having a content such as "... a fire has occurred in the vicinity ..." is output. The amplifier circuit 15 amplifies the audio signal from the audio synthesis circuit 14 to a predetermined level and outputs it. The amplifier power supply control circuit 16 is configured to include a transistor 20, a transistor 21, and a resistor 22. When the amplifier start signal from the control circuit 11 is turned off, that is, when it is at “L” level, the output of the transistor 20 is “L”. Then, the switch circuit composed of the transistor 21 and the resistor 22 is turned off, and the power supply of the amplifier circuit 15 is turned off. When the district sound stop switch 8 is pressed and the district sound representative signal B is not input, the control circuit 11 outputs the voice synthesis circuit 1
4, the amplifier circuit 15 and the relay K are turned off in this order to stop the voice alarm from the speaker 4 of the common unit. Short circuit protection circuit 1
Reference numeral 8 is for preventing the wiring between the voice alarm device 6 and the speaker 4 of the common part (that is, the voice signal line KPn-KPCn) from being short-circuited or the wiring in the speaker 4 from being short-circuited, thereby damaging the amplifier circuit 15. The speaker 4 is disconnected from the amplifier circuit 15 by detecting the current. The power supply circuit 19 is a commercial power supply 10
Direct current 24V is generated from 0V and output.

[0008]

In the conventional voice alarm device described above, the relay circuits K1 to K20 of the speaker line control circuit 17 are turned off after the power of the amplifier circuit 15 is turned off when the alarm is stopped. And corresponding contacts k ₁ to k ₂₀
Are opened, the contacts k ₁ to k ₂₀ are opened after the power supply of the amplifier circuit 15 is turned off.
While the audio signal line KPn-KPCn is cut off, a noise sound may be generated from the speaker 4 or the short-circuit protection circuit 18 may be activated due to an abnormal waveform signal generated due to a decrease in the power supply of the amplifier circuit 15. That is, the operation becomes unstable between the time when the power of the amplifier circuit 15 is turned off and the time when its output becomes completely zero, and the output of the voice synthesis circuit 14 does not become completely zero during this time. Therefore, the amplifier circuit 15 may output a signal having an abnormal waveform. A noise sound due to this signal may be output from the speaker 4 or the short-circuit protection circuit 18 may be operated. Incidentally, when the short-circuit protection circuit 18 operates, it cannot be restored unless the power source of the voice alarm device itself is turned off. Therefore, once the short-circuit protection circuit 18 operates, it is troublesome to restore it.

The present invention has been made in view of the above-mentioned circumstances, and prevents malfunction of a short-circuit protection circuit that protects a speaker from generating a noise sound and an overcurrent to the speaker due to a reduction in power supply of an amplifier circuit when an alarm is stopped. It is an object of the present invention to provide a sound alarm device that can be used and a fire alarm system for an apartment house using the sound alarm device.

To achieve the above object, an audio alarm device according to the present invention comprises an audio signal generating circuit for outputting an audio signal for alarm, and an amplifier circuit for amplifying the audio signal from the audio signal generating circuit. A cutoff circuit inserted between the amplifier circuit and the speaker, a short circuit protection circuit inserted between the cutoff circuit and the amplifier circuit, at least on / off control of the power supply of the amplifier circuit and the cutoff an audio alarm device and a control circuit for performing switching control of the circuit, the control circuit, after disconnecting the speaker from the amplifier circuit to the blocking circuit opening control to when the audio alarm stop, the amplification It is characterized in that the power supply of the circuit is controlled to be turned off . According to this configuration, the cutoff circuit for connecting the speaker and the amplifier circuit is turned off and the speaker is disconnected from the amplifier circuit before the power of the amplifier circuit is turned off. Even if a waveform signal is output,
A noise sound due to the signal is not output from the speaker, and the short circuit protection circuit does not operate.

A fire alarm system for an apartment house according to a second aspect of the present invention comprises: a fire detector provided in each dwelling unit of the apartment house; and a fire detector provided in each dwelling unit to detect an alarm issued by the fire detector. A dwelling unit receiver that outputs a fire signal at
It has a common-use speaker provided in a common area such as a corridor on each floor in the apartment building and the voice alarm device, and at least activates the voice alarm device when a fire signal from the receiver in the dwelling unit is captured. Sending a voice signal to each common area speaker on the floor where the fire detector that issued the alarm is installed and on the floor immediately above the common area speaker provided in the common area on each floor,
Further, the present invention is characterized by further comprising: a residential building receiver for stopping the output of the audio signal of the audio alarm device when the district sound is stopped. According to this configuration, since the voice alarm device according to claim 1 is provided, no noise sound is output from the speaker when the alarm is stopped, and the short-circuit protection circuit of the voice alarm device does not malfunction. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The voice alarm device of this embodiment is
Except that the operation when the output of the voice alarm of the control circuit is stopped is different,
The configuration is the same as the voice alarm device shown in FIG. 4 described above, and therefore FIG. 4 is incorporated. Further, since the fire alarm system for an apartment house using this voice alarm device has the same configuration as the fire alarm system for an apartment house shown in FIG. 3, FIG. 3 is also referred to in this case. When the district sound stop switch 8 (see FIG. 3) of the residential receiver 5 is operated and the district sound representative signal B is no longer input, the control circuit 11 of the voice alarm device according to the present embodiment relays K and amplifies. Circuit 1
5, the voice synthesizing circuit (voice signal generating circuit) 14 is turned off in this order to stop the voice alarm from the speaker 4 of the common part. That is, the control circuit 11 turns off the relay K of the contact k that connects the speaker 4 and the amplification circuit 15 before turning off the power supply of the amplification circuit 15, and thereafter, after a waiting time of, for example, 5 msec, the amplification circuit. Turn off the power of 15.

The operation of the control circuit 11 when the district sound is stopped will be described with reference to the flow chart shown in FIG. First, in step S10, it is determined whether or not the district sound stop state by the operation of the district sound stop switch 8, that is, the state in which the district sound representative signal B is not input, is output during the voice alarm output. The process is repeated, and if the local sound is stopped, the process proceeds to step S12, and the corresponding individual relay K is turned off. That is, when the speakers 4 and 4 of the common area on the first floor and the second floor of the apartment house are ringing, the relays K1 and K2 are turned off. Relays K1, K2 is the contact k _1, k ₂ is turned off is opened, the 1st and the speaker 4, 4 of the second floor of the shared portion is disconnected from the amplifier circuit 15. At this point, no sound is output from the speakers 4 and 4. After the relay K is turned off, that is, after the contacts k ₁ and k ₂ are opened, the step S14 waits for 5 msec, and after 5 msec, the amplifier start signal to the amplifier power supply control circuit 16 is turned off in step S16 (that is, "L" level). As a result, the power supply to the amplifier circuit 15 is turned off and stopped. After turning off the amplifier starting signal, the control signal for starting the voice synthesizing circuit 14 is turned off (that is, set to "L" level) in step S18. As a result, the voice synthesis circuit 14 is stopped. Note that FIG. 2 shows the above operation in a time chart. In this figure, time T1 is waiting for 5 msec.

As described above, in this embodiment, the connection between the speaker 4 and the amplifier circuit 15 is controlled to be opened before the power source of the amplifier circuit 15 is turned off when the voice alarm is stopped. Even if an abnormal waveform signal is output when the power is turned off, the speaker 4 has already been disconnected from the amplifier circuit 15. Therefore, no noise sound due to the abnormal waveform signal is output from the speaker 4. Moreover, the short-circuit protection circuit 18 does not malfunction due to the signal.

[0015]

As described above, according to the voice alarm device of the present invention, when the output of the voice alarm is stopped, the cutoff circuit for connecting the speaker and the amplifier circuit is opened before the power source of the amplifier circuit is turned off. Since the speaker is controlled to disconnect from the amplifier circuit, even if a signal having an abnormal waveform is output when the power source of the amplifier circuit is turned off, it is possible to prevent a noise sound due to the signal from being output from the speaker. Further, since it is possible to prevent an overcurrent to the speaker due to the noise, it is possible to avoid a malfunction of the short circuit protection circuit. By using this audio alarm device in a fire alarm system for an apartment house, a noise sound is output from the speaker when the alarm is stopped, and the short-circuit protection circuit of the audio alarm device does not malfunction. A fire alarm system for use can be provided.

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation of a control circuit of a voice alarm device according to the present invention when a voice alarm is stopped.

FIG. 2 is a time chart when a voice alarm of the control circuit of FIG. 1 is stopped.

FIG. 3 is a block diagram showing a configuration of a fire alarm system for an apartment house using a conventional voice alarm device.

FIG. 4 is a block diagram showing a configuration of the voice alarm device of FIG.

[Explanation of symbols]

1 apartment house 2 fire detector Receiver for 3 dwelling units 4 Common speaker 5 Receiver for residential building 6 Voice alarm device 8 district sound stop switch 11 Control circuit 14 Speech synthesis circuit 15 Amplification circuit 16 Amplifier power control circuit 17 Speaker line control circuit 18 Short circuit protection circuit 19 Power circuit K1 to K20 relay

Continuation of front page (56) Reference JP-A-7-175996 (JP, A) JP-A-9-204585 (JP, A) JP-A-52-50199 (JP, A) JP-A-2-68695 (JP , A) JP-A-2-284562 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G08B 17/00

Claims (2)

(57) [Claims] 1. A voice signal generating circuit for outputting a voice signal for warning, an amplifier circuit for amplifying a voice signal from the voice signal generating circuit, and a cutoff circuit interposed between the amplifier circuit and a speaker. A voice alarm device including a short-circuit protection circuit interposed between the cutoff circuit and the amplification circuit, and a control circuit for performing at least on / off control of the power supply of the amplification circuit and open / close control of the cutoff circuit. The control circuit controls the opening of the cutoff circuit to disconnect the speaker from the amplifier circuit when the voice alarm is stopped, and then the increase circuit.
Voice alarm characterized by turning off the power supply of the width circuit
apparatus. 2. A fire detector provided in each dwelling unit of an apartment house, and a dwelling unit receiver provided in each dwelling unit, which outputs a fire signal by detecting an alarm from the fire detector, A common-use speaker provided in a common area such as a corridor on each floor of the house, and the voice alarm device, and at least each floor is activated by activating the voice alarm device when a fire signal from the receiver in the dwelling unit is captured. Among the above-mentioned common-use speaker provided in the common-use part, a voice signal is sent to each common-use speaker on the floor where the fire detector that has issued the alarm is installed or on the floor immediately above, and the voice alarm device is in a state where the district sound is stopped. 2. A fire alarm system for an apartment house using the voice alarm device according to claim 1, further comprising: a receiver for a residential building that stops the output of the voice signal of 1.