SK148793A3 - Medical thermometer - Google Patents

Abstract

The clinical thermometer is comprised of an input from a signal conditioner, which signals are generated by a sensor consisting of a negative coefficient resistance arranged to remain in contact with an area of the human body, a signal translating stage which is comprised of a capacity-resistance load network; a microcontroller which receives the information from the prior stages without having to effect an analog-digital conversion, an output being provided for a voice synthetizer which incorporates parasite suppressing filters and an amplifier stage for the sound signals appropriate to the application and an acoustical transducer such as a loud speaker; and an output for a digital display of the measured temperature. The circuit is designed as a compact arrangement which integrates the stages of conditioning the input signals coming from the probe, the microcontroller and the conditioner of low frequency signals provided to the loud-speaker, said circuit having incorporated a voice synthetizer, a measurement circuit and a microcontroller which sends the corresponding signals to the ideal modules formed by the circuit. Application to the visual and sound indication of the human body temperature.

Description

Technical field

The present invention relates to a talking display causing a speaker output to be made.

1 medical designed thermometer with digital signal generation.

Display tags and sounds

BACKGROUND OF THE INVENTION

Medical thermometers are known which are provided with a display for displaying the measured temperature values, these values being represented by numbers and sometimes supplemented by other data. In some cases, however, these displays are difficult to read, especially at a certain distance, and by people who have vision problems. These problems arise especially with LCD displays, that is, using liquid crystals.

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The above-mentioned shortcomings are overcome by a medical thermometer with a digital and spoken display, designed to generate signals that cause markings on the display and sound. emitted by a loudspeaker according to the invention, the essence of which is. It consists of an electronic circuit based on a central processing unit which contains a set of memories and is programmable. and having an input to which a temperature-responsive sensor is connected, said sensor being formed by a negative temperature coefficient resistor, from a signal conditioning block emitted by said sensor, from a block containing a microcontroller. an adjusting stage for adjusting analog signals forming intelligible sounds emitted by the loudspeaker, and a display for displaying values.

The medical thermometer according to the invention is thus capable of emitting intelligible sounds corresponding to words. which indicates temperature values, so that this medical thermometer can be used without sight and difficulty by blind people and vision, without the need to read the values on the display, simply by listening to the spoken data. For this purpose, a medical thermometer according to the invention is provided with an electronic synthesizer which, together with the circuit and the representation of the time value corresponding to the measured temperature value, transmits on the display the teaching signals which as a whole

L ror s 1 ova, also indicating temperature values measured by a medical laplomer.

The electronic circuit on which the medical thermometer for measuring the temperature of the human body is based. it is connected, on the one hand, to a sensor intended to be placed directly on the body of a person, and, on the other hand, to a loudspeaker intended to emit sound signals corresponding to temperature values and to a display designed to display marks corresponding to the measured temperature values.

The electronic functionally consists of a microcomputer and supplied to the loudspeaker.

the circuit shown in the conditioning stage of the conditioning stage of the block diagram, input signals, voice signals.

Said circuit may be formed in a number of ways, according to one embodiment consisting of individual components belonging to each other, and according to the known physical knowledge of both electronic and integrated circuit design, the components are preferred, then in an integrated circuit in which the components perform logic functions representing the operation of the whole facility.

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The invention will be explained in more detail by way of example with reference to the accompanying drawing, in which it is shown schematically as a non-limiting example. block diagram of a medical thermometer according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

On the left side, there is a block showing which stages are marked with reference numbers and correspond to the following parts of the electronic circuit. Block 1 consists of a temperature sensor, i.e., a device that senses the temperature value and its variation and emits electrical measurable signals proportional to the measured temperature. The temperature sensor contains an NTC type resistor, that is, a resistance with a negative temperature coefficient, the characteristic of which is that its ohmic value decreases with increasing measured temperature. The system works according to the tables. supplied by the manufacturer, resistance - temperature is simple and quick to determine the ratio

Block 2 adjusts the signals emitted by the temperature sensor and converts the resistance value with a negative temperature coefficient into a data that can be directly processed by the microcomputer or microcontroller built into the device. This circuit is based on a load circuit formed by a precision resistor, a negative temperature coefficient resistor, and a capacitor.

In this way, the temperature is measured directly from the microcontroller without the need to incorporate an A / D converter into this device. In addition, due to the method used, errors caused by battery voltage drop and capacitor condition are eliminated.

Block 3 forms a microcontroller of the whole system, which measures the temperature, this information is fed to a set of quartz crystals embedded in the device, as well as the necessary data to a voice synthesizer. The microcontroller is made to order and is based on a computer, you are programmed to perform a general functional thermometer algorithm and to connect with a quartz coefficient).

several external modules (synthesizer, crystals and resistor with negative temperature)

Due to the technology used, the synthetic module and the liquid-crystal interface module are physically integrated into the microcontroller using a technology known as ASIC.

Block 4 provides for the modification of analog voice signals, including filtering, constituting this step of the controller.

amplification of these signals. The module is integrated into the above

Block 4 consists, as mentioned above, of a set of filters to eliminate interfering signals that may arise in the previous stages, and a voice synthesizer whose signals of low amplitude are amplified by an amplifier built in the same stage, generating the corresponding amplitude to power the loudspeaker forming the block 5. This loudspeaker is preferably built into the housing of the medical thermometer.

Block 6 is an LCD, i.e., a liquid crystal display, which displays values corresponding, for example, to the human body temperature at a given moment, maximum temperature and minimum temperature, and other information.

Among the functional parts constituting the medical thermometer according to the invention, there are three fixed and essential parts: a temperature sensor for directly sensing the human body temperature being measured, a loudspeaker for emitting sound signals indicating the measured values, and finally a display for visual representation measured values. Therefore, these functional parts will not be discussed further.

The functional parts constituting the essence of the circuit representing. The present invention relates to an economic thermometer according to the invention.

which can be called asic and

The blocks 2, 3 and 4 of the illustrated diagram can be made as a single block comprising all of said blocks 2, 3 and 4, constructed as an integrated circuit of the type intended for specific use. This circuit performs the functions of all of said blocks 2, 3 and 4, with the advantage of simplifying and reducing weight. The cost of this integrated circuit, even if manufactured according to the specific requirements of the manufacturer of medical thermometers, is also substantially reduced.

When analyzing the functional design of the unified block, which now forms a major part of the medical thermometer, the following sub-assemblies can be mentioned, with this distinction being only formal and given only to clarify the course of the input and output signals.

1) The voice synthesizer is based on ADPCM technology using 3 bits, allowing to obtain an audible frequency range for the necessary voice quality for the output stage. This voice synthesizer is based on a 12 kbytes memory containing the voice to be synthesized and a synchronous state computer that manages the memory and coordinates the appropriate messages to shape the numbers and markings shown, ranging from 32.0 to 42, 0 degrees Celsius.

2) A measurement circuit based on a synchronous state computer that uses digital signals to directly perform a resistance measurement with a negative temperature coefficient connected to a temperature sensor. This makes it possible to eliminate the connection to the A / D converter.

3) A microcontroller based on a computer of synchronous states and also used to transmit the relevant circuitry to carry out the case: triggering signals to each ideal module of algorithms, or activities necessary for the device, measuring physical quantities; control of power supply to voice synthesizer and display, switching off the device.

and finally

It should be pointed out that the method of measurement by the temperature sensor allows the processing of the input signal even ha in the software program, since there is no module designed to perform analog to digital conversion. The method used directly uses signals from the microcontroller to perform temperature to frequency conversion. That is, the physical-to-digital converter in this case does not exist in an integrated circuit that combines the above functional stages.

charge

Temperature measurement is performed by counting the amount of charge and discharge performed by a resistor with a negative temperature coefficient on the capacitor and comparing it to the amount of discharge achieved by a resistor of known value. negative resistance with

From the resulting ratio, the value is obtained by the temperature coefficient, and this value corresponds, according to the above table, to the temperature measured by the temperature sensor. This measurement method maximally simplifies the respective modules and obtaining the measured values in a stagnant manner, regardless of the variation of the supply voltage (supplied by the battery pack located in the device housing) and the differences in ohmic value of the capacitor used.

Another advantage of the embodiment of the medical thermometer according to the invention is the very small number of components directly involved in the measurement, which are the capacitor, the exact resistance and the resistance with a negative temperature coefficient connected to the temperature sensor.

According to a preferred embodiment of the invention, the medical thermometer is provided with a suitable housing, in which a temperature sensor is placed in an easily accessible location, which is placed on the human body, further comprising a loudspeaker and a plurality of openings enabling sound output.

Claims (4)

PATENT TOOLS 1. Medical thermometer with digital and spoken display. for producing signals causing the formation of 2-marks on the display and the production of sounds emitted by a loudspeaker, characterized in that it consists of 2 electronic circuits based on a central processing unit which contains a memory set and programmable and which has an input to which a temperature-responsive sensor connected to it, consisting of a negative temperature coefficient resistor, a signal conditioning block emitted by said sensor, a block containing a microcontroller, analog signal conditioning, a speaker emitted sound, a readjustment stage and a display for displaying values . Medical thermometer according to claim 1, characterized in that the signal produced by a negative temperature coefficient resistor consists of data directly processable by a microcontroller embedded in a device comprising a load circuit consisting of a precision resistor, a negative temperature coefficient resistor and a capacitor. A medical thermometer according to claim 1, characterized in that the built-in microcontroller is provided with quartz stabilization outlets providing the necessary data to the voice synthesizer module, and comprises a synthesizer module and a liquid-crystal interface module forming a display. A medical thermometer according to claim 1, characterized in that it consists of a single circuit, combining physically and functionally the steps of adjusting the input signals coming in from the integrated sensor correspondingly. T 2 m controller and 2 adjustment stage of low-frequency signals emitted by the loudspeaker, the integrated circuit comprising a voice synthesizer to produce audible signals generating sound signals indicating the measured temperature value; connected to a sensor, and a microcontroller for transmitting signals corresponding to ideal modules for performing the respective operations.