JP2007319287A - Alarm recognizing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarm recognizing system capable of facilitating treatment and responding to various kinds of medical devices. <P>SOLUTION: The alarm recognizing system has: a flash ROM 6 storing the width of each pulse of pulse signals constituted by converting the alarm sound generated by the medical device into digital as frequency data; a converting means converting input sound including the alarm sound to an input sound signals and amplifying the same, generating sound signals by taking out signals in the band of the alarm sound from the input sound, converting the sound signals to pulse signals, and constituted of a microphone 1, an amplifier 2, a filter 3, and a converting circuit 5; and an FPGA 7 performing coincident detection serially determining whether the pulse width of the pulse signals from the converting means and the pulse width of the frequency data read out from the flash ROM 6 coincide with each other, and detecting whether the frequency data and the pulse signals coincide with each other based on the number of pulse coinciding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an alarm recognition apparatus that recognizes an alarm sound of a medical device used by a resident in a medical facility such as a hospital, a clinic, or a nursing facility.

  As a medical facility, for example, in a hospital, an act of injecting a liquid from a patient's vein using a medical device such as an infusion pump or a syringe pump for treatment of a hospitalized patient is performed. In this case, when the liquid injection is completed, an alarm sound such as “beep-beep” is emitted from the medical device, and the patient listens to the alarm sound and informs the nurse of the nurse center using a nurse call. In this method, the patient listens to the alarm sound from the medical device and informs the nurse at the nurse center using the nurse call, which becomes an obstacle when giving priority to other urgent contacts and is troublesome. In particular, it becomes a problem that cannot be ignored at night when there are few nurses.

  By the way, in order to notify that the medical device is generating an alarm sound, the nurse call device and the medical device are connected via an outlet provided on the wall surface of the hospital room and the alarm from the medical device is transmitted to the nurse call. There is technology that is trying to do. However, there are problems such as the difference in the shape of the outlet and the interface of the medical device not corresponding to such a technology, which could not be realized with many medical devices.

  Therefore, there is a method for extracting a signal from a medical device that sends an electric signal simultaneously with an alarm sound from the medical device to display the signal on a nurse center display device or sounds a buzzer (for example, see Patent Document 1). . In this signal extraction method for a medical device, an alarm sound emitted from the medical device is received by a microphone, and a reception signal received by the microphone is converted into a digital signal and written in advance in a storage device as first audio data. Thereafter, the alarm sound received from the microphone is converted into a digital signal to be used as the second audio data, and this data is written in the storage device. Then, the first audio data and the second audio data are compared, and if the two data match, it is determined that an alarm sound is output from the medical device, and the alarm sound is output from the medical device. An alarm information signal indicating that the alarm is being sent is sent to the outside.

Such a medical device signal extraction method allows the nurse to perform the tasks in order of priority in consideration of the urgency between processing the alarm sound of the medical device and other tasks.
JP-A-10-234680

  However, this conventional medical device signal extraction method has the following problems. This medical device signal retrieval method obtains two pieces of audio data, and then compares these data. At this time, if the two audio data do not match, the signal extraction method of the medical device determines that at least one of the audio data is not an alarm sound from the medical device, and the alarm sound from the medical device is The process from the reception of the first audio data to the comparison of the second audio data is repeated. For this reason, the process of writing the audio data to the storage device is repeated, and the signal extraction method of the medical device has a problem that the processing time is increased and the process becomes complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an alarm recognition device that enables simplification of processing, and that can handle various medical devices without requiring a dedicated interface for the medical devices.

  In order to solve the above-mentioned problem, the invention of claim 1 includes storage means for storing, as frequency data, the width of each pulse of a pulse signal obtained by digitally converting an alarm sound emitted from a medical device, and an alarm sound. Conversion means for converting an input sound into an input sound signal, taking out a signal in the band of the alarm sound from the input sound signal and converting it into a pulse signal; width of each pulse of the pulse signal from the conversion means; and the storage means Detecting means for sequentially determining whether or not each pulse width of the frequency data read out from is similar, and determining that the frequency data and the pulse signal match when the number of similar pulses is equal to or greater than a predetermined value; It is characterized by providing.

  That is, in the first aspect of the invention, the storage means stores in advance the width of each pulse of the pulse signal obtained by converting the alarm sound emitted by the medical device as frequency data. In such a state, when the medical device emits an alarm sound, the conversion means converts the input sound including the alarm sound into an input sound signal, and extracts the signal of the alarm sound band from the input sound signal to generate the sound signal. The sound signal is converted into a pulse signal. The detection means sequentially determines whether or not the pulse width of the pulse signal from the conversion means matches the pulse width of the frequency data read from the storage means. Thereafter, the detection means performs coincidence detection between the frequency data and the sound signal based on the number of coincident pulses.

  According to a second aspect of the present invention, in the alarm recognition device according to the first aspect of the present invention, the alarm recognition device includes a selection unit that selects a sound signal from the conversion unit based on a predetermined level set in advance, and the detection unit includes the selection unit. It is characterized in that the determination is made when the sound signal is larger than a predetermined level according to the selection result of the means.

  According to a third aspect of the present invention, in the alarm recognition device according to the first or second aspect, the storage unit stores the width of each pulse of a pulse signal corresponding to a plurality of alarm sounds as frequency data, and the detection unit. Sequentially determines whether the pulse of each pulse signal from the conversion means is similar to the width of each pulse of the plurality of frequency data read from the storage means, and the number of similar pulses is equal to or greater than a predetermined value. In some cases, the frequency data and the pulse signal are determined to match.

  According to a fourth aspect of the present invention, in the alarm recognition device according to any one of the first to third aspects, when the detection means receives a pulse signal from the conversion means, the pulse width of the pulse signal and the frequency The pulse width of the pulse signal from the conversion means is continuously compared with the leading pulse width of the frequency data until the leading pulse width of the data matches, and a determination is made when the two pulse widths are similar. It is characterized by that.

  In the invention of claim 1, it is determined whether or not the input sound is an alarm sound by comparing the pulse width of the pulse signal corresponding to the input sound signal with the pulse width of the frequency data stored in advance. Therefore, there is no need to repeat recording as in the conventional case, and the processing can be simplified. Furthermore, compared to the case where audio data matching is detected as in the prior art, whether or not the alarm sound depends on the number of pulses of the pulse signal similar to the pulse width of the frequency data stored in advance corresponding to the alarm sound of the medical device. Therefore, it is possible to arbitrarily adjust the alarm sound recognition accuracy.

  According to the second aspect of the present invention, whether or not the sound signal is subject to coincidence detection is selected using the selecting means. For example, the same kind of medical device in another room is generated by the coincidence detection for the low-level sound signal. It is possible to prevent the possibility of malfunction by detecting the alarm sound.

  According to the invention of claim 3, it is possible to automatically determine and notify which medical device the currently generated alarm sound is emitted. This also makes it possible to deal with alarm sounds from a plurality of different medical devices such as manufacturers.

  According to the invention of claim 4, the head pulse of the pulse signal and the head pulse of the frequency data stored in advance can be matched, so that the alarm sound recognition rate can be improved.

Next, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, a case where an alarm sound of a medical device used for a patient near a hospital bed in a hospital room is a detection target will be described as an example of the medical device used in a hospital.
(Embodiment 1)

  An alarm recognition apparatus according to this embodiment is shown in FIG. 1 includes a microphone 1, an amplifier 2, a filter 3, a comparator 4, a conversion circuit 5, a flash ROM (Read Only Memory) 6, an FPGA (Field Programmable Gate Array) 7, an alarm output circuit 8, and a relay circuit. 9 is provided. Further, as shown in FIG. 2, the FPGA 7 includes an address counter 7A, a control circuit 7B, a pulse width measurement circuit 7C, a pulse width comparison circuit 7D, a pulse width similarity counter 7E, and a coincidence detection circuit 7F.

  The microphone 1 is used in the vicinity of a medical device. The microphone 1 uses a sound including an alarm sound generated by a medical device as an input sound, and converts the input sound into an input sound signal that is an analog electric signal. The amplifier 2 amplifies the input sound signal output from the microphone 1. The filter 3 extracts the sound signal in the band used for the alarm sound of the medical device from the input sound signal received from the amplifier 2, and sends this sound signal to the comparator 4 and the conversion circuit 5.

  The comparator 4 selects whether the sound signal from the filter 3 is output from a medical device installed in the vicinity of the microphone 1. For this purpose, a threshold of a predetermined level is preset in the comparator 4. This threshold value is set to a level at which a sound signal corresponding to the sound of the minimum volume output from the medical device is detected. Accordingly, when the sound signal from the filter 3 exceeds the threshold value, the comparator 4 sends an enable signal indicating that the sound signal is valid as a recognition process target to the FPGA 7. When the sound signal is below the threshold value, a disable signal indicating that the sound signal is ignored is sent to the FPGA 7.

  The conversion circuit 5 converts the analog sound signal output from the filter 3 into a digital sound signal, that is, a pulse signal. The alarm sound from the medical device is usually different for each medical device, and is basically a simple sinusoidal repetitive sound. As a result, the pulse signal becomes a pulse train that is different for each medical device and is simply repeated. An example of pulse conversion from an analog sound signal to a pulse signal is shown in FIG.

In the flash ROM 6, each pulse width of the pulse signal corresponding to the alarm sound generated by the medical device to be detected is stored in advance as frequency data by appropriate means. In storing, first, the level of an alarm sound emitted by the medical device is detected. In the case of a sound having a sound volume above a certain level, an analog sound signal is converted into a pulse signal by an A / D conversion circuit. Then, each pulse width of the pulse signal is counted and measured by a counter, and each counter value is sequentially stored in the flash ROM 6 as frequency data in advance. In this embodiment, the pulse signal shown in FIG. 4 is used as a pulse signal corresponding to an alarm sound generated by the medical device to be detected. In Figure 4, the pulse signal is the pulse width T _A, ..., if repeated T _G sequentially, flash ROM6 is sequentially stored as frequency data of a predetermined number N pulses widths.

  The FPGA 7 is an LSI that can be programmed, and forms the configuration shown in FIG. 2 by programming. With this configuration, the FPGA 7 performs recognition processing on the pulse signal from the conversion circuit 5. That is, when the FPGA 7 receives the pulse of the pulse signal from the conversion circuit 5, it measures the width of this pulse. Further, the FPGA 7 reads out a pulse of frequency data from the flash ROM 6. Thereafter, the FPGA 7 compares the pulse width of the read frequency data with the pulse width of the pulse signal to detect the coincidence of the pulse width, and the alarm sound included in the input sound of the microphone 1 corresponds to the alarm sound corresponding to the frequency data. To determine if it can be considered the same. Then, the FPGA 7 controls the alarm output circuit 8 and the relay circuit 9 to notify the determination result.

  The alarm output circuit 8 displays, for example, lighting of a light emitting diode (not shown) that the medical device to be detected emits an alarm sound under the control of the FPGA 7. The relay circuit 9 includes a relay (not shown), and informs that the medical device to be recognized is generating an alarm sound by closing the relay contact of the relay under the control of the FPGA 7.

Specifically, the address counter 7A of the FPGA 7 counts the number of pulses of the pulse signal output from the conversion circuit 5, generates a memory address corresponding to the count value, and outputs the memory address to the control circuit 7B. The control circuit 7B controls reading of frequency data from the flash ROM 6. That is, when receiving a memory address from the address counter 7A, the control circuit 7B reads out the pulse width stored in the memory address from the flash ROM 6 and sends it to the pulse width comparison circuit 7D. Thus, the control circuit 7B is sent to the pulse width comparator circuit 7D reads sequentially from the beginning of the pulse width T _A frequency data.

  On the other hand, the pulse width measurement circuit 7C of the FPGA 7 measures the width of the pulse signal received from the conversion circuit 5 in order, and sends the pulse width as the measurement result to the pulse width comparison circuit 7D. The pulse width comparison circuit 7D compares the pulse width of the pulse signal received from the pulse width measurement circuit 7C with the pulse width of the frequency data received from the control circuit 7B. The pulse width comparison circuit 7D is used when the pulse width of the pulse signal received by the pulse width measurement circuit 7C is within a predetermined range (for example, 98% to 102%) of the pulse width of the frequency data received from the control circuit 7B. The determination result that both are similar is sent to the pulse width similarity counter 7E. Then, the pulse width similarity counter 7E counts the number of similar pulses. The coincidence detection circuit 7F matches the pulse signal received from the conversion circuit 5 with the pulse signal corresponding to the frequency data stored in the flash ROM 6 if the number of pulses counted by the pulse width similarity counter 7E is equal to or greater than a predetermined number. Match detection is performed assuming that For example, if the numerical value is equal to or greater than a certain ratio (for example, 25% or more) of the number N (for example, 512) of pulse widths stored in the flash ROM 6, coincidence is detected. When the coincidence detection circuit 7F determines that the two pulse signals coincide with each other, the alarm output circuit 8 is controlled to light the light emitting diode, and the relay circuit 9 is controlled to close the relay contact. The coincidence detection circuit 7F performs coincidence detection only while receiving the enable signal from the comparator 4, and pauses coincidence detection while receiving the disable signal from the comparator 4.

Next, the operation of the present embodiment will be described. First, an alarm sound generated by a medical device to be recognized is recorded in advance. That is, the level of the alarm sound emitted from the medical device is detected, and when an alarm sound exceeding a predetermined level is emitted, the alarm sound is converted into a pulse signal by the comparator. Thereafter, the time that is pulse width of each pulse of the high level of the pulse signal is measured by a counter, the count pulse width T _A, ..., writes the N a T _G in the order predetermined number N pieces in the flash ROM 6.

  After the recording of the alarm sound emitted by the medical device to be recognized is completed and the frequency data is stored in the flash ROM 6, a microphone, for example, is installed in the vicinity of the medical device in which a nurse, for example, in the hospital detects the alarm sound. To do. The microphone 1 uses sounds generated in the vicinity as input sounds, and converts the input sounds into input sound signals. The amplifier 2 amplifies the input sound signal from the microphone 1, and the filter 3 extracts the sound signal in the band used for the alarm sound of the medical device from the input sound signal output from the amplifier 2, and compares this sound signal with the comparator 4 and the conversion circuit 5.

  When the sound signal output from the filter 3 exceeds the threshold value, the comparator 4 sends an enable signal indicating that the sound signal is valid to the FPGA 7, and when the sound signal is equal to or lower than the threshold value, A disable signal indicating that the sound signal is ignored is sent to the FPGA 7. The conversion circuit 5 converts the analog sound signal output from the filter 3 into a digital pulse signal and sends it to the FPGA 7.

For example, the FPGA 7 performs recognition processing when receiving the first pulse P1 of the pulse signal shown in FIG. First, the FPGA 7 measures the pulse width. That, FPGA 7 is a pulse width measurement circuit 7C, by examining the distance from the rising _{T 1} of the pulse P1 to the trailing _{T 2,} measuring the width _{T a} pulse P1.

Thereafter, the FPGA 7 compares the pulse widths. That, FPGA 7 is a time of between falling T ₂ of the pulse P1 to the rise T ₃ of the next pulse P2, using the memory address counting the first pulse P1 by the address counter 7A, corresponding to the counter value , under the control of the control circuit 7B, it reads out the beginning of the pulse width _{T a} from the frequency data of the flash ROM 6. FPGA7 is by pulse width comparator circuit 7D, compares the pulse width _{T A} pulse width _{T a} and frequency data of the pulse signal. Here, the FPGA 7 determines whether or not the two pulse widths are similar by the pulse width comparison circuit 7D. If the pulse width of the pulse signal T _a pulse width comparator circuit 7D and the pulse width T _A of the frequency data is similar is determined, the pulse width similar counter 7E counts the pulses P1.

  Similarly, the FPGA 7 determines whether or not the pulse width is similar for each pulse following the first pulse P1 of the pulse signal. That is, the FPGA 7 uses the pulse width similarity counter 7E to determine whether the width of each pulse of the pulse signal is similar to a predetermined number N of frequency data as shown in FIG. Count the number of similar pulses. When the counting by the pulse width similarity counter 7E is completed, the FPGA 7 counts the number of pulses counted by the pulse width similarity counter 7E, that is, the number of pulses that match the pulse width of the frequency data among the pulses of the pulse signal is a predetermined number or more. The coincidence detection circuit 7F detects whether or not When the FPGA 7 detects a predetermined number or more of matched pulses by the match detection circuit 7F, the FPGA 7 considers that the pulse signal from the conversion circuit 5 matches the pulse signal corresponding to the frequency data stored in the flash ROM 6. , Send the output to the alarm output circuit 8 to light up the light emitting diode of the alarm output circuit 8, send the output to the relay circuit 9 to close the relay contact, the alarm sound from the medical device (For example, a nurse center).

As described above, according to the present embodiment, each pulse width of the frequency data of the medical device to be compared is stored in advance in the flash ROM 6, so that the process of repeating recording as in the prior art is not required. Thus, the processing can be simplified. In the present embodiment, each pulse width of the frequency data is read from the flash ROM 6 and compared, so that the speed of the recognition process is increased and the alarm sound can be recognized quickly. Further, in the present embodiment, whether or not the sound signal is subject to recognition processing by the FPGA 7 is selected by the comparator 4, so that erroneous recognition can be prevented. For example, it is possible to prevent the possibility of malfunction by recognizing an alarm sound generated by a medical device of the same kind in another hospital room by recognition processing for a low-level sound signal. Furthermore, in comparison with the case where coincidence of audio data is detected as in the prior art, in this embodiment, the pulse width of frequency data recorded in advance corresponding to the alarm sound of the medical device and the input sound of the microphone 1 are supported. Since the recognition processing is performed by comparing the pulse width of the pulse signal to be performed, it is possible to arbitrarily adjust the alarm sound recognition accuracy as needed by changing the setting of the pulse width comparison circuit 7D. In addition, the number of similar pulses is counted, and if they are similar to each other by a predetermined number or more, it is determined that they match. Therefore, by changing the setting of the pulse width similarity counter 7E, the alarm sound recognition accuracy can be increased as necessary. It is possible to adjust arbitrarily.
(Embodiment 2)

  In the present embodiment, the leading pulse of the sound signal from the conversion circuit 5 and the leading pulse of the frequency data stored in the flash ROM 6 are matched. For this reason, in the present embodiment, as shown in FIG. 7, the pulse width comparison circuit 7D has a predetermined pulse width of the frequency data received from the control circuit 7B. When it is out of the range, it is determined that the pulse width of the pulse signal from the conversion circuit 5 and the pulse width of the frequency data stored in the flash ROM 6 are dissimilar. Then, the pulse width comparison circuit 7D sends a dissimilar signal indicating dissimilarity to the address counter 7A. When receiving the dissimilar signal, the address counter 7A sends an initial value memory address, that is, a memory address corresponding to a value when the first pulse of the pulse signal is counted, to the control circuit 7B. As a result, while the pulse width comparison circuit 7D outputs the dissimilar signal, the control circuit 7B reads out the leading pulse width of the frequency data from the flash ROM 6 and sends it to the pulse width comparison circuit 7D.

Pulse width comparator circuit 7D, as shown in FIG. 8, are repeated and the beginning of the pulse width T _A of the frequency data stored in advance, a comparison between the pulse width of the pulse signal from the conversion circuit 5. The pulse width comparison circuit 7D continues to send dissimilar signals to the address counter 7A until the two pulse widths are similar. When the two pulse widths are similar, the pulse width comparison circuit 7D stops the output of the dissimilar signal and performs the same recognition processing as in the first embodiment.

As described above, in the present embodiment, the counting by the pulse width similarity counter 7E is not started until the leading pulses are similar, and therefore the width of the leading pulse of the pulse signal corresponding to the alarm sound currently being issued by the medical device. And the pulse width at the beginning of the frequency data stored in advance can be matched, and the alarm sound recognition rate can be improved.
(Embodiment 3)

  In the present embodiment, a plurality of alarm sounds, for example, three types of alarm sounds emitted from different medical devices are recorded in advance. That is, the flash ROM 6 stores the first frequency data, the second frequency data, and the third frequency data corresponding to each alarm sound. The alarm output circuit 8 includes a light emitting diode (not shown) corresponding to each medical device, and from which medical device the light emitting diode corresponding to the medical device that detected the output of the alarm sound is turned on by the control of the FPGA 7. Informs if an alarm sound is heard. The relay circuit 9 includes a relay (not shown) corresponding to each medical device, and by controlling the FPGA 7, the relay contact of the relay corresponding to the medical device that detected the output of the alarm sound is closed, thereby Announce the occurrence.

  As shown in FIG. 9, the FPGA 7 according to the present embodiment includes an address counter unit 7J, a control circuit 7B, a pulse width measurement circuit 7C, a pulse width comparison circuit 7D, a pulse width similarity counter unit 7K, and a coincidence detection unit 7L. ing. In the present embodiment, components that are considered to be the same as or the same as those in FIG. 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  The address counter unit 7J includes the same three as the address counter 7A of the first embodiment. The first address counter generates a memory address for reading the first frequency data stored in the flash ROM 6, and the second address counter reads the second frequency data stored in the flash ROM 6. A memory address is generated. The third address counter generates a memory address for reading out the third frequency data stored in the flash ROM 6. Then, the address counter unit 7J sends the generated memory addresses to the control circuit 7B at predetermined intervals.

  The pulse width similarity counter unit 7K includes the same three as the pulse width similarity counter 7E of the first embodiment. If the comparison result with the first frequency data is within a predetermined range, the first pulse width similarity counter indicates that the pulse width of the pulse signal from the conversion circuit 5 is similar to the pulse width of the first frequency data. to decide. Then, the first pulse width similarity counter counts the number of similar pulses. Similarly, the second pulse width similarity counter, if the comparison result with the second frequency data is within a predetermined range, the pulse width of the pulse signal from the conversion circuit 5 and the pulse width of the second frequency data Are judged to be similar. Then, the second pulse width similarity counter counts the number of similar pulses. Further, the third pulse width similarity counter determines that the pulse width of the pulse signal from the conversion circuit 5 and the pulse width of the third frequency data are different if the comparison result with the third frequency data is within a predetermined range. Judge that they are similar. Then, the third pulse width similarity counter counts the number of similar pulses.

  The coincidence detection unit 7L includes the same three as the coincidence detection circuit 7F of the first embodiment. The first coincidence detection circuit stores the pulse signal received from the conversion circuit 5 in the flash ROM 6 if the number of pulses counted by the first pulse width coincidence counter of the pulse width similarity counter unit 7K is equal to or greater than a predetermined number. It is considered that the pulse signal corresponding to the first frequency data is matched. Then, the first coincidence detection circuit sends an output to the alarm output circuit 8 to turn on the corresponding light emitting diode, and sends an output to the relay circuit 9 to close the corresponding relay contact. Similarly, if the number of pulses counted by the second pulse width similarity counter of the pulse width similarity counter unit 7K is equal to or greater than a predetermined number, the second coincidence detection circuit flashes the pulse signal received from the conversion circuit 5. Considering that the pulse signal corresponding to the second frequency data stored in the ROM 6 coincides, the corresponding light emitting diode of the alarm output circuit 8 is turned on, and the corresponding relay contact of the relay circuit 9 is closed. The third coincidence detection circuit stores the pulse signal received from the conversion circuit 5 in the flash ROM 6 if the number of pulses counted by the third pulse width similarity counter of the pulse width similarity counter unit 7K is a predetermined number or more. The corresponding light emitting diode of the alarm output circuit 8 is turned on and the corresponding relay contact of the relay circuit 9 is closed, assuming that it matches the pulse signal corresponding to the third frequency data.

  Here, as in the first embodiment, the first to third coincidence detection circuits detect coincidence only while receiving the enable signal from the comparator 4 and while receiving the disable signal from the comparator 4. Pauses match detection.

  Next, the operation of the present embodiment will be described. First, an alarm sound generated by each medical device to be recognized is recorded in advance. This recording method is the same as in the first embodiment. As a result, the flash ROM 6 stores the first, second, and third frequency data having N pulse widths.

  The recording of the alarm sound generated by each medical device to be recognized is completed, and each frequency data is stored in the flash ROM 6, and a microphone 1 is placed in the vicinity of the medical device for which a nurse, for example, in the hospital detects the alarm sound. Is installed. Thereafter, in the same manner as in the first embodiment, a pulse signal corresponding to an alarm sound included in the input sound of the microphone 1 is added to the FPGA 7.

For example, the FPGA 7 performs a recognition process when receiving the first pulse P11 of the pulse signal shown in FIG. First, the FPGA 7 measures the pulse width. That, FPGA 7 is a pulse width measurement circuit 7C, examines the rise _{T 11} of the pulse P11 to fall _{T 12,} to measure the width of the pulse P11.

Thereafter, the FPGA 7 compares the pulse widths. That, FPGA 7 is a time _{T 21} between falling _{T 12} pulses P11 rise _{T 13} of the next pulse P12, counting the first pulse P11 by the first address counter in the address counter unit 7J, the counter value Is read out from the first frequency data of the flash ROM 6 under the control of the control circuit 7B. The FPGA 7 compares the width of the pulse P11 of the pulse signal with the pulse width of the first frequency data by the pulse width comparison circuit 7D. Here, the FPGA 7 determines whether or not the two pulse widths are similar by the pulse width comparison circuit 7D. When the pulse width comparison circuit 7D determines that the two pulse widths are similar, the first pulse width similarity counter of the pulse width similarity counter unit 7K counts the pulse P11.

Similarly, FPGA 7 is a next time point T _22, and compares the width and the pulse width of the second frequency data of the pulse signal of the pulse P11 by the pulse width comparator circuit 7D. The pulse width comparison circuit 7D determines whether the two pulse widths are similar. When the pulse width comparison circuit 7D determines that the two pulse widths are similar, the first pulse width similarity counter of the pulse width similarity counter unit 7K counts the pulse P11.

  Hereinafter, similarly, the FPGA 7 determines whether or not the pulse width of the first, second, and third frequency data is similar to each of the pulses following the first pulse P1 of the pulse signal. We will make the same judgment. Thereafter, if the number of pulses counted by the first pulse width similarity counter is greater than or equal to a predetermined number by the first coincidence detection circuit of the coincidence detection unit 7L, the FPGA 7 flashes the pulse signal received from the conversion circuit 5 Assuming that it matches the pulse signal corresponding to the first frequency data stored in the ROM 6, the output is sent to the alarm output circuit 8, the corresponding light emitting diode is turned on, the output is sent to the relay circuit 9, and the corresponding Close the relay contact. Similarly, the FPGA 7 receives the pulse signal received from the conversion circuit 5 if the number of pulses counted by the second pulse width similarity counter is greater than or equal to a predetermined number by the second coincidence detection circuit of the coincidence detection unit 7L. Considering that the pulse signal corresponding to the second frequency data stored in the flash ROM 6 coincides, the corresponding light emitting diode of the alarm output circuit 8 is turned on, and the corresponding relay contact of the relay circuit 9 is closed. Furthermore, if the number of pulses counted by the third pulse width similarity counter is greater than or equal to a predetermined number by the third coincidence detection circuit of the coincidence detection unit 7L, the pulse signal received from the conversion circuit 5 is stored in the flash ROM 6. The corresponding light emitting diode of the alarm output circuit 8 is turned on and the corresponding relay contact of the relay circuit 9 is closed, assuming that it matches the pulse signal corresponding to the third frequency data.

  As described above, according to the present embodiment, it is possible to automatically determine and notify which of the three medical devices the currently generated alarm sound corresponds to. This also makes it possible to deal with alarm sounds from a plurality of different medical devices such as manufacturers.

  As mentioned above, although each embodiment of the present invention has been described in detail, the specific configuration is not limited to each embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in the present invention. In each embodiment, the case where the alarm sound of a medical device used by a patient is automatically recognized near a bed in a hospital room has been described. The present invention is also applied to the case where an alarm sound of a medical device used by a person is recognized. Needless to say, the second embodiment can be applied to the third embodiment. Furthermore, in the third embodiment, a plurality of alarm sounds emitted from different medical devices are recorded in advance. However, different alarm sounds emitted from one medical device are recorded in advance, and an alarm corresponding to each alarm sound is recognized. You may do it. In the above embodiment, the function of the FPGA 7 may be realized by a CPU.

It is a block diagram which shows Embodiment 1 of this invention. It is a block diagram which shows FPGA. It is a wave form diagram which shows an example of the conversion from an analog sound signal to a pulse signal. It is a wave form diagram which shows an example of a pulse signal. It is a figure explaining the comparison with a pulse signal and frequency data. It is a figure which shows the pulse width of a pulse signal, and the pulse width of frequency data. FIG. 6 is a block diagram showing an FPGA according to a second embodiment. It is a figure which shows the pulse width of the pulse signal by Embodiment 2, and the pulse width of frequency data. FIG. 10 is a block diagram showing an FPGA according to a third embodiment. FIG. 10 is a diagram for explaining measurement timing according to the third embodiment.

Explanation of symbols

1 Microphone (conversion means)
2 Amplifier (conversion means)
3 filters (conversion means)
4 Comparator (sorting means)
5 Conversion circuit (conversion means)
6 Flash ROM (storage means)
7 FPGA (detection means)
7A Address counter 7B Control circuit 7C Pulse width measurement circuit 7D Pulse width comparison circuit 7E Pulse width similarity counter 7F Match detection circuit 7J Address counter section 7K Pulse width similarity counter section 7L Match detection section 8 Alarm output circuit 9 Relay circuit

Claims (4)

Storage means for storing, as frequency data, the width of each pulse of a pulse signal obtained by digitally converting an alarm sound generated by a medical device;
Conversion means for converting an input sound including an alarm sound into an input sound signal, taking out a signal of the band of the alarm sound from the input sound signal, and converting it into a pulse signal;
In order to determine whether each pulse width of the pulse signal from the conversion means and each pulse width of the frequency data read from the storage means are similar, if the number of similar pulses is greater than or equal to a predetermined value, Detection means for determining that the frequency data and the pulse signal match;
An alarm recognition device comprising: A selection unit that selects a sound signal from the conversion unit based on a predetermined level set in advance;
2. The alarm recognition device according to claim 1, wherein the detection unit makes a determination when a sound signal is larger than a predetermined level based on a selection result of the selection unit. The storage means stores each pulse width of a pulse signal corresponding to a plurality of alarm sounds as frequency data,
The detection means sequentially determines whether the pulse of each pulse signal from the conversion means is similar to the width of each pulse of a plurality of frequency data read from the storage means, and the number of similar pulses is predetermined. 3. The alarm recognition device according to claim 1, wherein when the value is equal to or greater than the value, the frequency data and the pulse signal are determined to coincide with each other.   When the detection means receives the pulse signal from the conversion means, the pulse width of the pulse signal from the conversion means and the pulse width of the pulse signal from the conversion means until the pulse width of the pulse signal matches the leading pulse width of the frequency data. The alarm recognition device according to any one of claims 1 to 3, wherein the comparison with the leading pulse width of the frequency data is continued and the determination is made when the two pulse widths are similar.

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