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DESCRIPTION JP2010049606

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DESCRIPTION JP2010049606
An object of the present invention is to reliably output a sweep sound including a frequency at
which a maximum sound pressure can be obtained. A PWM processing unit generates and
outputs a PWM pulse train having a fixed duty ratio and having a frequency that changes linearly
with the passage of time in a sweep frequency range including a maximum sound pressure
frequency fp1 set initially. The sweep sound is output from the speaker 46 through the low pass
filter 42 and the amplifier 44. When setting the sound pressure measurement mode, the
measurement processing unit 56 causes the PWM processing unit 54 to output a sweep sound
from the speaker 46 to measure the sound pressure. The measured maximum sound pressure
frequency fp2 obtained by the sound pressure measurement is input to the EEPROM 32 and
stored. The frequency range correction unit 58 corrects the sweep frequency range by shifting
the initial setting position of the maximum sound pressure frequency fp1 within the sweep
frequency range to the stored measured maximum sound pressure frequency fp2. [Selected
figure] Figure 2
Alarm
[0001]
The present invention relates to an alarm installed in a general house or the like to monitor and
warn a fire by battery drive.
[0002]
BACKGROUND Conventionally, a home alarm (hereinafter referred to as a "home alarm device")
that detects and warns of an abnormality such as a fire or a gas leak in a home has become
widespread.
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[0003]
In such a home alarm device, a sensor unit and an alarm unit are integrally provided in the home
alarm device, and a fire alarm is issued when a fire is detected, and the fire alarm and alarm can
be performed with the home alarm device alone. Therefore, it is easy to install and inexpensive,
and it has been widely disseminated along with the obligatory installation in general houses.
[0004]
As an alarm when a fire is detected by a conventional home alarm device, for example, an alarm
sound such as "Peepy" is output from a speaker or a piezoelectric buzzer.
Here, “Peepy” is called sweep sound, and the frequency is linearly changed with the passage of
time in an easy-to-hear sweep frequency range such as 2 to 3 KHz including the frequency at
which the maximum sound pressure of the speaker and piezoelectric buzzer can be obtained. The
sweep sound is output.
JP, 2005-44317, A JP, 2004-54356, A
[0005]
However, in such a conventional alarm, the frequency at which the maximum sound pressure can
be obtained is obtained from the characteristic data of the speaker used in the design stage, and
the frequency of the maximum sound pressure is included in the sweep frequency range,
Although the sweep frequency range is determined, the frequency at which the maximum sound
pressure of the speaker or piezoelectric buzzer can be obtained varies depending on the
individual or the CPU clock, and the maximum sound pressure is set in the sweep frequency
range set based on the design parameters There is a problem that the sweep frequency range
may be deviated from the frequency at which is obtained.
[0006]
An object of the present invention is to provide an alarm device which can reliably output a
sweep sound including a frequency at which a maximum sound pressure can be obtained.
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[0007]
According to the present invention, when an abnormality is detected, a sweep sound whose
frequency changes linearly with time as an alarm sound is output from the acoustic converter as
an alarm sound, and has an initial duty ratio and an initial state. A PWM processing unit that
generates and outputs a PWM pulse train having a frequency that changes linearly with time in a
predetermined sweep frequency range including the set maximum sound pressure frequency,
and a voice signal by passing the PWM pulse train through a low pass filter The acoustic output
circuit unit that amplifies and outputs from the acoustic converter after converting it into a
signal, and when the sound pressure measurement mode is set, causes the PWM processing unit
and the acoustic output circuit unit to output sweep sound from the acoustic converter and
measure the sound pressure A sound pressure measurement unit, a storage unit for receiving
and storing the measured maximum sound pressure frequency from which the maximum sound
pressure obtained by the sound pressure measurement is obtained, and the maximum sound in
the sweep frequency range The initial setting position of the frequency, alarm, characterized in
that by shifting the stored measured maximum sound pressure frequency and a frequency range
correcting unit that corrects the sweep frequency range.
[0008]
Here, the frequency range correction unit obtains a difference between the maximum sound
pressure frequency of the initially set sweep frequency range and the stored measured maximum
sound pressure frequency, and sets the initially set sweep frequency range so as to eliminate this
difference. to correct.
[0009]
The PWM processing unit comprises: an amplitude data setting unit that sets predetermined
amplitude data that does not change with the passage of time; a frequency setting unit that sets a
frequency that changes linearly with the passage of time within a predetermined sweep
frequency range; A PWM conversion unit that generates and outputs a PWM pulse train having a
duty ratio converted from the amplitude data set by the amplitude data setting unit and having a
frequency that changes according to the passage of time set by the frequency setting unit;
Equipped with
[0010]
The acoustic transducer includes a speaker or a piezoelectric buzzer.
[0011]
According to the present invention, the sweep frequency range is corrected such that the
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maximum sound pressure frequency in the sweep frequency range initially set based on the
design parameters is matched to the measured maximum sound pressure frequency measured
and stored for each alarm. Even if the actual maximum sound pressure frequency is different due
to the variation as an individual of the speaker or the piezoelectric buzzer, the sweep sound
including the maximum sound pressure frequency can be output with certainty.
[0012]
FIG. 1 is an explanatory view showing an appearance of a home alarm device according to the
present invention, and FIG. 1 (A) shows a front view and FIG. 1 (B) shows a side view.
[0013]
In FIG. 1, the home alarm device 10 of the present embodiment is composed of a cover 12 and a
main body 14.
At the center of the cover 12, a smoke detection unit 16 having a smoke inlet open to the
periphery is disposed to detect a fire when smoke from the fire reaches a predetermined
concentration.
[0014]
An acoustic hole 18 is provided on the lower left side of the smoke detection unit 16 provided on
the cover 12, and a speaker is built in the back so that an alarm sound and a voice message can
be output.
An alarm stop switch 20 is provided below the smoke detection unit 16.
The alarm stop switch 20 also functions as an inspection switch.
[0015]
An LED 22 is disposed inside the alarm stop switch 20 as shown by a dotted line, and when the
LED 22 lights up, it passes through the switch cover portion of the alarm stop switch 20 so that
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the lighting state of the LED 22 can be recognized from the outside. There is.
[0016]
In addition, a mounting hook 15 is provided on the upper rear side of the main body 14, and a
screw or the like is screwed into the wall of the room to be installed, and the living alarm device
10 can be installed on the wall by attaching the mounting hook 15 to this screw. it can.
[0017]
The home alarm device 10 is installed on, for example, a wall surface such as a living room or a
bedroom of a house, and if a fire occurs, a fire is detected and an alarm is started.
Detecting this fire and starting an alarm is called "announcement" in a resident alarm.
[0018]
For example, "Peepy" is continuously output as a sweep sound as an alarm sound of the home
alarm device 10-4 when a fire is detected.
At the same time, the LED 22 blinks or blinks.
When the alarm stop switch 20 is operated in a state where the home alarm device 10 is emitting
an alarm sound, the alarm sound is stopped and the LED 22 is turned off.
[0019]
Further, the home alarm device 10 has a fault monitoring function, and when a fault is detected,
for example, an alarm sound such as "beep" is intermittently output at predetermined time
intervals and the LED 22 is turned on instantaneously, causing a fault. To inform
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The fault alarm output from the home alarm device 10 can be stopped by operating the alarm
stop switch 20.
[0020]
The faults detected and warned by the home alarm device 10 are mainly battery capacity
decrease alarm (battery out alarm) which detects and warns the drop of the battery voltage, and
other sensors such as a smoke detector etc. Includes appropriate fault alerts such as faults.
[0021]
FIG. 2 is a block diagram showing an embodiment of a home alarm according to the present
invention.
The home alarm device 10 includes a CPU 24. The CPU 24 is provided with a sensor unit 26, a
notification unit 28, an operation unit 30, an EEPROM 32, a RAM 36, a transfer unit 38, and a
battery power supply 40.
[0022]
In the present embodiment, the smoke detection unit 16 is provided in the sensor unit 26, and a
smoke detection signal corresponding to the smoke concentration is output to the CPU 24.
In addition to the smoke detector 16, the sensor 26 may be provided with a thermistor for
detecting a temperature caused by a fire.
Further, in the case of a home alarm device for monitoring a gas leak, the sensor unit 26 is
provided with a gas leak sensor.
[0023]
The notification unit 28 is provided with a speaker 46 which is an acoustic transducer driven by
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an acoustic output circuit unit including a low pass filter 44 and an amplifier 44, and an LED 22
driven by the display circuit unit 48.
A piezoelectric buzzer may be used instead of the speaker 46.
[0024]
The low pass filter 42 is a simple filter composed of a capacitor and a resistor, converts the PWM
pulse train output from the CPU 24 into an audio signal waveform, amplifies it by the amplifier
44 and outputs a sweep sound from the speaker 46.
The LED 22 blinks, blinks, lights up, or the like to display an abnormality such as a fire or a
failure.
[0025]
An alarm stop switch 20 is provided in the operation unit 30. When the alarm stop switch 20 is
operated, the alarm sound being sent from the home alarm device 10 can be stopped. The alarm
stop switch 20 doubles as an inspection switch in the present embodiment.
[0026]
The alarm stop switch 20 is effective when an alarm sound is output from the notification unit
28 by the speaker 46. On the other hand, the alarm stop switch 20 functions as an inspection
switch in a normal monitoring state where no alarm sound is output, and when the inspection
switch is pressed, a voice message for inspection, etc. is output from the notification unit 28.
[0027]
The EEPROM 34 stores maximum sound pressure frequency data 34 of the speaker 46 obtained
and input by sound pressure measurement to be described later.
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[0028]
The battery power supply 40 uses, for example, an alkaline dry battery having a predetermined
number of cells, supplies a battery voltage of, for example, 5.0 volts as a rated voltage, and
reduces the power consumption of the entire circuit unit in the living horn 10 as a battery
capacity. Guarantees a battery life of approximately 10 years.
[0029]
An abnormality monitoring unit 50 and a sweep sound processing unit 52 are provided in the
CPU 24 as functions realized by execution of a program.
The sweep sound processing unit 52 is provided with functions of a PWM processing unit 54, a
sound pressure measurement unit 56, and a frequency range correction unit 58.
[0030]
When the smoke detection signal from the smoke detection unit 16 provided in the sensor unit
26 exceeds the fire level and the fire is detected, the abnormality monitoring unit 50 detects an
alarm sweep sound from the speaker 46 of the notification unit 28, for example, "Peepy". Are
repeatedly output, and the LED 22 of the notification unit 28 is blinked, for example.
[0031]
The PWM processing unit 54 provided in the sweep sound processing unit 52 has a frequency
that changes linearly with the passage of time in a predetermined sweep frequency range having
a predetermined duty ratio and including the initially set maximum sound pressure frequency
fp1. Generate and output a PWM pulse train.
The PWM pulse train output from the PWM processing unit 54 is passed through the low pass
filter 42 and then amplified by the amplifier 44 to output a sweep sound from the speaker 46.
[0032]
The sound pressure measurement unit 52 causes the speaker 46 to output a sweep sound whose
frequency changes linearly in the sweep frequency range set wider by the PWM processing unit
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54 at the time of setting the sound pressure measurement mode by switch operation or the like.
The sound pressure is measured using the sound pressure measuring device to obtain the
maximum sound pressure frequency fp2.
[0033]
Maximum sound pressure frequency data 34 indicating the maximum sound pressure frequency
fp2 obtained by the sound pressure measurement is input and stored in the EEPROM 32 using a
personal computer or a dedicated writer.
[0034]
Note that the storage of the measured maximum sound pressure frequency may be stored by
switching the CPU port by a jumper resistor.
[0035]
The frequency range correction unit 58 is a PWM processing unit to shift the initial setting
position of the maximum sound pressure frequency fp1 within the sweep frequency range to the
maximum sound pressure frequency fp2 according to the measured maximum sound pressure
frequency data 34 stored in the EEPROM 32. The sweep frequency range preset in 54 is
corrected so that the actually measured maximum sound pressure frequency fp2 of the speaker
46 always falls within the corrected sweep frequency range.
[0036]
FIG. 3 is a block diagram showing a functional configuration of the sweep sound processing unit
52 of FIG.
In FIG. 3, the CPU 24 includes an amplitude data setting unit 60, a register 62, a frequency
setting unit 64, a register 66, a PWM conversion unit 68, and a control unit 70 as a PWM
processing unit 54 which is a function realized by executing a program. Is provided.
[0037]
On the other hand, in the EEPROM 32, maximum sound pressure frequency data 34 indicating
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the maximum sound pressure frequency fp2 of the speaker 46 obtained by the sound pressure
measurement is stored.
Further, for the frequency setting unit 64 of the PWM processing unit 54, a frequency range
correction unit 72 is provided.
[0038]
The amplitude data setting unit 60 sets predetermined amplitude data which does not change
with the passage of time in the register 62.
The frequency setting unit 64 sets, in the register 66, a frequency that linearly changes with the
passage of time in a predetermined sweep frequency range.
The PWM conversion unit 68 has a duty ratio converted from the amplitude data set in the
register 62 by the amplitude data setting unit 60, and changes the frequency which changes with
the lapse of time set in the register 66 by the frequency setting unit 64. Generate and output a
PWM pulse train.
[0039]
FIG. 4 is a graph showing conversion characteristics for converting the amplitude data in the
PWM conversion unit 68 of FIG. 3 into a duty ratio.
In FIG. 4, the horizontal axis is amplitude data, which is, for example, 8-bit data, and all 1 has the
maximum value Dmax. The vertical axis is the duty ratio R, the maximum value Tmax of the
amplitude data is 100%, the duty ratio R is 0% at the audio data 0, therefore the linear data 74 is
converted to the duty ratio R It is set as a conversion characteristic to
[0040]
Referring again to FIG. 3, the PWM pulse output from the PWM conversion unit 68 is passed
through a simple low-pass filter 42 consisting of a capacitor and a resistor to remove frequency
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components, for example, exceeding the upper limit of audio audio frequency of the PWM pulse.
After being converted into an audio signal waveform close to a sinusoidal waveform having a
smooth amplitude change, and amplified by the amplifier 44, the audio signal is output from the
speaker 46 as a sweep sound.
[0041]
FIG. 5 shows sound pressure characteristics and impedance characteristics of the speaker 46
used in the present embodiment, which is given as design parameters based on product
specifications.
[0042]
In FIG. 5, the horizontal axis is the frequency f and is shown by logarithm.
The left side of the vertical axis is the sound pressure level, and the right side is the impedance.
[0043]
The speaker 46 has a sound pressure characteristic 76, and the maximum sound pressure
frequency fp1 at which the maximum sound pressure is 95 dB is around 3.2 KHz.
The speaker 46 has an impedance characteristic 78, and the impedance also increases in a peak
manner in the portion where the sound pressure is high.
[0044]
With respect to the sound pressure characteristic 76 of such a speaker, for example, a range of
500 Hz to 4 KHz is set as the sweep frequency range 75 for outputting the sweep sound so as to
include the maximum sound pressure frequency fp1.
[0045]
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FIG. 6 is a time chart showing the sweep frequency set by the frequency setting unit 64 of FIG.
In FIG. 6, the frequency f is shown on the vertical axis with respect to the time t on the horizontal
axis, and the sweep sound is output over the time t0 to t6.
[0046]
The time from time t0 to t6 is divided into three sections t0 to t2, t2 to t4, and t4 to t6, and
changes linearly with different slopes with the passage of time in each time divided section A
frequency output characteristic having a polygonal line characteristic is set.
[0047]
Also, the sweep frequency range is 500 Hz to 4.0 kHz determined from the sound pressure
characteristics in FIG. 5, and by changing the sweep sound in this frequency range, even the
elderly person has a frequency that can be easily heard, the sweep sound Can be clearly
recognized.
[0048]
The sweep frequency range always includes the maximum sound pressure frequency fp1, and the
maximum sound pressure point P1 is initially set to pass through the maximum sound pressure
frequency fp1 at time tp of the last section.
[0049]
The change of the sweep frequency with the passage of time is as follows.
First, in the time interval t0 to t2, the frequency f is changed in accordance with the straight line
80 having the slope a, with the lowest start frequency f1 as the initial value, and when the
frequency f4 is reached at the time t1, the gentle slope b is The frequency is changed until time
t2 in accordance with the straight line 82 held.
[0050]
For the next time interval t2 to t4, the frequency f5 is reached at time t3 according to the straight
line 84 having the same slope a as the straight line 80, starting from the frequency f2 shifted in
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the positive direction by the predetermined frequency Δf with respect to the start frequency f1.
After changing the frequency f up to the time t4, the frequency f is changed according to the
straight line 86 having the same slope b as the straight line 82.
[0051]
For the last time interval t4 to t6, the frequency f6 at the time t5 according to the straight line 88
having the inclination a starting from the frequency f3 higher by the predetermined frequency
Δf than the start frequency f2 in the immediately preceding time interval t2 to t4. The frequency
f is linearly increased until the frequency b is reached, and then the frequency is changed linearly
up to the time t6 according to the straight line 90 having the slope b.
[0052]
FIG. 7 is a list showing a piecewise function for setting the sweep frequency of FIG. 6 with the
passage of time, and the frequency generated according to the straight lines 80, 82, 84, 86, 88,
90 with the passage of time. Can be defined as a partitioned function divided at each time
interval.
[0053]
By calculating the piecewise function of FIG. 7 by executing the program in the CPU 24, the
frequency setting unit 64 can set the frequency which changes according to the straight line 80
to 90 in FIG. Since fixed amplitude data is set for the register 60, a PWM pulse whose frequency
changes according to FIG. 6 with the passage of time having a constant duty ratio converted
based on the amplitude data. Can be generated and output.
[0054]
The PWM pulse for sweep sound output output from the PWM processing unit 62 is converted
into a substantially sinusoidal waveform by passing a low-pass filter 42 so that frequency
components exceeding the upper limit frequency of the audio audio frequency band are removed
and After being amplified by the above, the sweep sound such as "Peepy" is output from the
speaker 46, for example.
[0055]
However, the setting of the sweep frequency shown in FIG. 6 is obtained from the sound pressure
characteristic 76 as the design data of FIG. 5, and the maximum sound pressure frequency of the
speaker 46 varies among individuals, and the frequency of FIG. In the setting, the sweep
frequency range may not include the maximum sound pressure frequency of the speaker actually
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used.
[0056]
Therefore, in the present invention, at the stage of the inspection test after the assembly of the
home alarm device of the present embodiment is completed, the sweep of the wide sweep
frequency range set for measurement from the alarm by setting the sound pressure
measurement mode. Sound is actually output, and the maximum sound pressure level fp2 is
measured using a sound pressure measuring device, and stored as maximum sound pressure
frequency data 32 in the EEPROM 32, as shown in FIG.
[0057]
When power is supplied from the battery 40 of the alarm device 10 and started up with the
maximum sound pressure frequency data 34 stored in the EEPROM 32, operation of the
frequency range correction unit 58 by execution of the program by the CPU 24 causes the
situation shown in FIG. Thus, the maximum sound pressure frequency data 34 is read out from
the EEPROM 32, and the maximum sound pressure frequency within the sweep frequency range
sweeps the initial setting position of fp1 to match the stored measured maximum sound pressure
frequency fp2. Correct the range.
[0058]
FIG. 8 shows the correction of the sweep frequency range of FIG.
The correction of the sweep frequency range is obtained by setting the difference frequency Δf
between the initially set maximum sound pressure frequency fp1 and the actual maximum sound
pressure frequency fp2 obtained by the sound pressure measurement as Δf = fp2-fp1, as shown
in FIG. The straight lines 80, 82, 84, 86, 88 and 90 in FIG. 6 are shifted in the frequency axis
direction by the difference frequency .DELTA.f and corrected to straight lines 80a, 82a, 84a, 86a,
88a and 90a.
[0059]
As a result, the maximum sound pressure point P1 with the maximum sound pressure frequency
fp1 before correction becomes the maximum sound pressure point P2 with the maximum sound
pressure frequency fp2 after correction, and the maximum sound pressure is produced at the
scheduled time tp of the sweep frequency range Can.
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[0060]
FIG. 9 is a list showing a piecewise function for setting the sweep frequency after correction of
FIG. 8 as time passes, and a constant for determining the start position of the right side is
corrected by addition of the difference frequency Δf.
[0061]
FIG. 10 is a flowchart showing alarm sound processing by the sweep sound processor of FIG.
First, when the battery 40 is started by supplying power to the CPU 24 in the inspection test
process at the factory, the maximum sound pressure frequency is checked for correction in step
S1, and the process proceeds to step S2 because the correction is not performed at first. Perform
sound pressure measurement processing.
[0062]
In the sound pressure measurement process, the alarm device of this embodiment is placed in a
non-acoustic room or the like in which the sound pressure measurement device is installed, and
the PWM processing unit 54 in FIG.
The sweep frequency range at the time of this sound pressure measurement changes the
frequency in a frequency range wider than the sweep frequency range 75 for alarm shown in
FIG. 5, for example, 100 Hz to 6 KHz.
[0063]
When the maximum sound pressure frequency fp2 of the speaker actually used is obtained by
this sound pressure measurement, in step S3, the input operation is performed and the maximum
sound pressure frequency data 34 is stored in the EEPROM 32 of the alarm.
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Subsequently, at step S4, correction processing of the sweep frequency range is executed as
shown in FIG. 8, and a correction completed flag is set.
[0064]
On the other hand, when the user installs at home and supplies power from the battery and starts
use after factory shipment, correction is determined from the setting of the correction
completion flag in step S1, and steps S2 to S4 are skipped and the step is performed. Go to 5.
[0065]
In step S5, an alarm sound output instruction by fire detection is awaited, and when the alarm
sound output instruction is determined, the process proceeds to step S6 to execute a sweep
sound output process, for example, a sweep sound such as "Peepy Peep" from the speaker Make
it output.
[0066]
Subsequently, in step S7, a lapse of a predetermined time is awaited, and during that time, if the
alarm stop is not determined in step S8, the process returns to step S6, the sweep sound is
output again, and this is repeated.
[0067]
If it is determined in step S8 that the alarm is stopped before it is determined in step S7 that the
predetermined time has elapsed, the process returns to step S5 and waits for a next alarm sound
output instruction.
[0068]
FIG. 11 is a flowchart showing the details of the sweep sound output process in step S6 of FIG.
10, and implements the processing operation of FIG.
[0069]
In the sweep sound output process of FIG. 11, first, in step S11, a constant in the partition
function for sweep output shown in FIG. 9 is set.
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The setting of the constant includes setting of the start frequencies f1, f2, f3, f4, f6, f8, and slopes
a, b.
The constant setting also includes a fixed set of constant amplitude data for the register 62 by
the amplitude data setting unit 60.
[0070]
Subsequently, in step S12, the elapsed time t is increased by a predetermined time Δt, and in
step S13, the division function of the section to which the current elapsed time t belongs is
selected.
Subsequently, the elapsed time t is substituted into the piecewise function selected in step S14 to
calculate the frequency f, and the frequency f is set in the register 66.
[0071]
Next, in step 15, the amplitude data set in the register 62 is converted into a duty ratio in
accordance with the conversion characteristic of FIG. 4 and a PWM pulse having the duty ratio
converted in step S16 and the set frequency f is output to the register 66.
Then, the processing of steps S12 to S17 is repeated until the sweep end frequency is determined
in step S17.
The sweep sound output in this manner necessarily includes the frequency that is the maximum
sound pressure of the speaker, and the sweep sound can be heard with certainty.
[0072]
In the above embodiment, although the case where the alarm sound is output only for the sweep
sound is taken as an example, the alarm sound combining the sweep sound and the voice
message, for example, "Peep fire is a fire" is output You may do so.
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[0073]
In this case, the voice message signal is sampled at 8 KHz, for example, and voice data as 8-bit
data is stored in the EEPROM 32 of FIG. 2 and the frequency setting unit 64 sets 8 KHz equal to
the sample frequency in the register 66. With the passage of time, the amplitude data setting unit
60 reads out voice data of the EEPROM 32 in the register 62 at a reading speed of 8 KHz and
sets it as amplitude data, and has a duty ratio converted from the amplitude data by the PWM
conversion unit 68 and 8 KHz The PWM pulse is output, converted to an audio signal by the low
pass filter 42, amplified by the amplifier 44, and an audio message is output from the speaker
46.
[0074]
In the above embodiment, the amplitude (amplitude voltage level) of the speaker drive signal is
kept constant by setting constant amplitude data and converting it to a duty ratio. Changing the
duty ratio by changing linearly with a predetermined inclination according to the passage of
time, and changing the volume of the sweep sound with the passage of time, for example, how to
emit an alarm sound such that the volume is sequentially increased from the initial volume May
be performed.
[0075]
Moreover, although the above-mentioned embodiment took the home alarm device for fire
detection as an example, other than this, a gas leak alarm, an alarm for crime prevention, etc.
detect other appropriate abnormalities other than that. This embodiment can be applied to the
alarm device as it is.
In addition, it can be applied to alarm devices for various applications such as buildings and
offices as well as for residences.
[0076]
In the above embodiment, the case where the sensor unit is integrally provided to the alarm unit
is taken as an example, but as another embodiment, the alarm unit may be provided with the
sensor unit separately from the alarm unit. .
[0077]
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18
Further, the present invention is not limited to the above-described embodiment, includes
appropriate modifications that do not impair the objects and advantages thereof, and is not
limited by the numerical values shown in the above-described embodiment.
[0078]
Explanatory drawing showing the appearance of the living alarm device according to the present
invention. Block diagram showing the embodiment of the living alarm device according to the
present invention. Block diagram showing the functional configuration of the sweep sound
processing unit of FIG. Graph showing conversion characteristics Graph showing sound pressure
characteristics of the speaker provided as design parameters Time chart showing change over
time of initially set sweep frequency Piecewise function to generate time change over sweep
frequency shown in FIG. 6 The time chart showing the time change of the sweep frequency
corrected based on the measured maximum sound pressure frequency. A list of the piecewise
functions generating the time change of the corrected sweep frequency shown in FIG. 8 is shown.
FIG. 10 is a flowchart showing alarm sound processing according to the embodiment of FIG. 2;
FIG. 10 is a flowchart showing the details of sweep sound output processing in step S6 of FIG. 10;
Over chart
Explanation of sign
[0079]
Reference Signs List 10: home alarm 12: cover 14: main body 15: mounting hook 16: smoke
detection unit 18: acoustic hole 20: alarm stop switch 22: LED 24: CPU 26: sensor unit 28: CPU
30: operation unit 32: EEPROM 34 : Maximum sound pressure frequency data 36: RAM 38:
Translocation unit 40: Battery power supply 42: Low pass filter 44: Amplifier 46: Speaker 48:
Display circuit unit 50: Abnormality monitoring unit 52: Alarm sound processing unit 54: Sweep
sound processing unit 56: sound pressure measurement unit 58: frequency range correction unit
60: amplitude data setting unit 62, 66: register 64: frequency setting unit 68: PWM conversion
unit 70: control unit 72: sound pressure characteristic
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