TWI435707B - Physiological signal measurement system applied for smart phone - Google Patents

Description

Physiological signal measurement system for smart phones

The invention relates to a physiological signal measuring system, in particular to a physiological signal measuring system applied to a smart phone.

The medical ultrasound-Doppler system is mainly used to measure blood flow velocity in human blood vessels and is used for judging various cardiovascular diseases, and thus has been widely used in various clinical diagnoses. The ultrasonic-Doppler system can use an analog circuit or a digital circuit to excite and receive an ultrasonic signal. After the ultrasonic signal enters the blood vessel, the Doppler effect produces a different blood flow rate. The echo signal is processed by a digital signal processing chip to calculate the echo signal, and is converted into a Doppler signal, wherein the frequency of the Buhler signal is in an audio range, and the Buhler signal has a real signal. And a imaginary signal. The physician can listen to the Doppler signal to determine the directionality of the blood flow and the blood flow rate. In addition, the instrument can analyze the real signal and the imaginary signal in the Doppler signal to generate a spectrum image and spectrum. The image is displayed on a display device to quantify the condition of the blood flow and provide useful diagnostic information to the physician.

However, the above-mentioned digital signal processing chip is expensive, and the front end must be connected with a complicated additional circuit, such as a high sampling rate analog converter, a memory and a stylized counter, etc., resulting in additional circuit design. inconvenient. In addition, in order to display the spectrum image, an external display device is also required, and the peripheral circuit of the external display device is also extremely cumbersome, including a driving circuit and an image encoding circuit. Therefore, the above additional circuit and display device increase the volume of the medical ultrasonic-Doppler system, so that the medical ultrasonic-Doppler system can only be used by professional medical institutions.

In view of the increase in computing speed and display function of modern smart phones, and its advantages of high penetration rate and low price in the future, if the smart phone is regarded as a new embedded device, it is applied to medical ultrasonic waves. - In the Doppler system, the volume problem of the medical ultrasound-Doppler system can be effectively solved. However, at present, most smart phones only provide a single audio source input terminal. How to synchronously input the real signal and the imaginary signal in the Doppler signal to the input terminal of the single tone source is a problem to be solved in the technical field.

An object of the present invention is to provide a Doppler device for efficiently processing a physiological signal such as a blood flow rate and displaying a spectrum image of a physiological signal by a smart phone for convenient use by the user in daily life. And achieve the function of instant self-monitoring.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

In order to achieve one or a part or all of the above or other objects, a physiological signal measuring system applied to a smart phone according to an embodiment of the present invention includes a transducing device, a Doppler device, and a wisdom. Mobile phone. The transducer is adapted to be attached to a user's skin.

The Doppler device includes an excitation receiving module, a first processing module and a second processing module. The excitation receiving module signal connection transducing device is configured to transmit an ultrasonic excitation signal to the transducing device, and the ultrasonic excitation signal enters the skin of the user via the transducing device, generates an echo signal, and activates the receiving module. To receive echo signals. The first processing module signal is connected to the excitation receiving module, and processes the echo signal to generate a first Doppler signal. The second processing module signal is connected to the first processing module, and converts the first Doppler signal into a single audio signal. The smart phone has a single audio source terminal, and is selectively connected to the Doppler device by a single audio source terminal, including a third processing module and a display module. The third processing module is electrically connected to the single source terminal to receive the single audio signal, and is converted into a second Doppler signal, and processes the second Doppler signal to generate a spectrum image. The display module is electrically connected to the third processing module to display the spectrum image.

In an embodiment, the Doppler device includes a first control module electrically connected to the excitation receiving module, the first processing module, and the second processing module, and the smart phone transmits the first source through the single source. Control the signal to the first control module. The smart phone further includes a second control module, an interface module and a memory module. The second control module is electrically connected to the single source end and the third processing module. The interface module is electrically connected to the second control module for the user to input the control signal, and is transmitted to the first control module via the second control module, the single source terminal, and the second processing module. The memory module is electrically connected to the single sound source terminal and the third processing module to store the single audio signal, the second Doppler signal and the spectrum image.

The first control module includes an oscillator and a timing controller, and the oscillator and the timing controller generate an trigger control signal according to the control signal. The excitation receiving module comprises a pulse exciter, a chopper, a current limiter, an amplifier and a filter. The pulse exciter controls the signal according to the trigger to generate an ultrasonic excitation signal. The chopper is electrically connected to the pulse exciter and the transducing device to reduce the noise of the ultrasonic excitation signal and prevent the echo signal from entering the pulse exciter. The wave limiter is electrically connected to the chopper to limit the size of the echo signal. The amplifier is electrically connected to the limiter to amplify the echo signal. The filter is electrically connected to the amplifier to filter out noise in the amplified echo signal.

In an embodiment, the first processing module includes a demodulator, a sampler, and a filter. The demodulator is electrically connected to the excitation receiving module to demodulate the echo signal into a first Doppler signal, wherein the first Doppler signal comprises a real signal and an imaginary signal. The sampler is electrically connected to the demodulator to sample the first Doppler signal according to a sampling frequency. The filter is electrically connected to the sampler to filter out the high frequency harmonic signal and the low frequency vibration signal in the sampled first Doppler signal. The second processing module includes a conversion circuit having a quadrature oscillator, a multiplier, and an adder. The quadrature oscillator generates a first orthogonal signal and a second orthogonal signal. The multiplier is electrically connected to the first processing module and the quadrature oscillator to multiply the real signal by the first orthogonal signal to generate a first frequency, and multiply the imaginary signal by the second orthogonal signal. A second frequency is generated. The adder is electrically connected to the multiplier and adds the first frequency and the second frequency to form a single audio signal.

In an embodiment, the third processing module has a video processing method, including: capturing a second Doppler signal; providing a data buffer to store the second Doppler signal; and performing a Fourier transform method To convert the second Doppler signal into a spectrum image; display an instant spectrum image on the display module; provide an end button on the display module; and when the user presses the end button, the third processing module The spectrum image is stored in a memory module. In addition, the method further includes: capturing a second Doppler signal; providing a recording button on the display module; when the user presses the recording button The third processing module stores the second Doppler signal in the memory module.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as upper, lower, left, right, front or rear, etc., are only used to refer to the directions of the accompanying drawings. Therefore, the directional terms are used for illustration only and are not intended to limit the invention.

The physiological signal measurement system of the embodiment of the present invention provides a Doppler device, and can effectively process a physiological signal such as a blood flow rate by using a smart phone. A physiological signal such as a blood flow rate is measured by an ultrasonic wave to generate a Doppler signal, and after a Doppler device, for example, an analog circuit operation, a single audio source terminal of the smart phone, for example, a headphone input terminal, is used. Internally, the spectrum analysis of the Doppler signal is performed to display a spectrum image of the Doppler signal on its screen, which is convenient for the user to use in daily life, and achieves the function of real-time self-monitoring. And the medical ultrasonic-Doppler system is miniaturized, and can be applied to portable or pocket type.

Please refer to the first figure, which is a block diagram of a physiological signal measurement system according to an embodiment of the present invention. A physiological signal measuring system includes a transducer device 100, a Doppler device 200 and a smart phone 300. The transducer device 100 is attached to a user's skin, such as an attached ultrasonic transducer (Attached Ultrasound Transducer), wherein the transducer device 100 includes the number, size, and center of a transducer. Frequency, materials, etc., all of which can be customized according to the needs of different users.

The Doppler device 200 includes an excitation receiving module 210 (Transmitter/Receiver), a first processing module 220 (Processor), a second processing module 230, a first control module 240 (Controller), and a charging device. Unit 250 (Battery). The excitation receiving module 210 is, for example, an ultrasonic excitation receiving module, and is connected to the transducer device 100 for transmitting an ultrasonic excitation signal U to the transducing device 100. The ultrasonic excitation signal U enters and uses the transducing device 100. After the skin of the person, an echo signal U' is generated, and the receiving receiving module 210 is configured to receive the echo signal U'.

The first processing module 220 is, for example, an ultrasonic signal processing module, and is connected to the excitation receiving module 210 and the first control module 240, and processes the echo signal U' to generate a first Doppler signal ( Not numbered). The second processing module 230 is, for example, an audio processor, and is connected to the first processing module 220 and the first control module 240 to convert the first Doppler signal into a single audio signal O. In particular, since the first Doppler signal has a directional characteristic, it includes a real signal and an imaginary signal, and the second processing module 230 transmits the first Doppler signal that originally required the two-channel transmission. By means of mixing, it becomes a single audio signal O that requires only mono transmission, and maintains its directional characteristic, and outputs to a single audio source terminal 310 on the smart phone 300, for example, a headphone input terminal.

The first control module 240 is electrically connected to the excitation receiving module 210, the first processing module 220, and the second processing module 230, and the first control module 240 is connected to the smart phone 300 by the second processing module 230. The single source terminal 310 is connected to the signal, and the smart phone 300 can transmit a control signal C to the first control module 240 of the Doppler device 200 via the tone source terminal 310 according to the signal connection relationship. The control signal C is processed by the second processing module 230 for audio processing, and then transmitted to the first control module 240, so that the first control module 240 can be used by the smart phone 300. The parameters inside the Doppler device 200 are adjusted. The first control module 240 is a parameter controller between the modules, and uses the smart phone 300 to perform internal parameter adjustment through the control signal C transmitted by the single source terminal 310. The adjustable parameters include ultrasonic excitation. Frequency, pulse repetition period, number of pulses, position of sample/hold, cutoff frequency of filter, etc.

The charging unit 250 can provide all of the power required by the Doppler device 200. In one embodiment, the charging unit 250 can be charged or directly powered by a DC-to-DC power converter or the like to supply power to other modules.

The Smartphone Unit 300 is, for example, a Personal Digital Assistant (PDA) or a Tablet PC, and includes the aforementioned audio source 310 (Audio Jack) and a third processing module 320 (Analysis). A display module 330 (Display), a second control module 340, a user interface 350 (User Interface), a memory module 360, and a wireless transmission W (Wireless) and a positioning information G (Position Information) external communication module 370 (Communications). The Doppler device 200 can be selectively connected by a single tone source terminal 310. In this embodiment, the tone source terminal 310 includes a microphone input terminal and a mono channel transmission terminal, and the microphone input terminal receives the Doppler input terminal. The single audio signal O of the directional signal of the device 200 is transmitted to the third processing module 320, and the mono signal transmission terminal outputs the control signal C transmitted by the second control module 340.

The third processing module 320 is electrically connected to the single source terminal 310 to receive the single audio signal O, and is converted into a second Doppler signal (not labeled), and processes the second Doppler signal to generate a spectrum image. The third processing module 320 receives the single audio signal O of the directional signal of the Doppler signal from the microphone input end of the single source terminal 310, and converts it into a second Doppler signal and stores it in a data buffer. And a Fourier transform operation is performed immediately, and the Fourier transform operation includes operations such as a mixture demodulation process, an overlap process, a Doppler spectrum operation, a Doppler signal storage, a picture storage, and a spectrogram analysis.

The display module 330 is electrically connected to the third processing module 320, and the spectrum image is displayed in real time, and a control function button, a scroll and a data graphic provided by the interface module 350 are displayed. The Doppler spectrum diagram with directionality processed by the third processing module 320.

The second control module 340 is electrically connected to the single source terminal 310 and the third processing module 320, and includes an internal control and an external control. The internal control system is controlled according to the program corresponding to the interface module 350 and the third processing module 320, and the external control system controls the Doppler device 200, and the interface module 350 receives a user-adjusted parameter. The signal is converted to control signal C and transmitted to the Doppler device 200 using the tone source terminal 310.

The interface module 350 is electrically connected to the second control module 340 for the user to input the control signal C, and is transmitted through the second control module 340, the single source terminal 310, and the second processing module 230 of the Doppler device 200. To the first control module 240. The interface module 350 can provide a plurality of functional buttons through the display module 330, and includes a plurality of internal control buttons and options, such as: Start, Pause, Save, Record, Stop. (Stop), Finish, Color, Sampling Frequency, graphic enlargement, etc., and a plurality of external control buttons and reels corresponding to the Doppler device 200, for example: ultrasonic excitation center frequency, pulse Wave repetition period, number of pulse waves, sampling depth, and the like.

The memory module 360 is electrically connected to the single source terminal 310 and the third processing module 320 for storing the single audio signal O, the second Doppler signal, and the spectrum image. In one embodiment, memory module 360 such as a memory card (microSD ^TM), may be built in the smartphone 300, such as a portable hard drive or the additional outer smartphone 300.

The external communication module 370 has a wireless transmission function (Wireless) including, for example, Wifi, 3G, 3.5G, Bluetooth transmission, etc., and functions of positioning information G such as GSM, GPS, Google MAP, and the like. The function of wireless transmission W can be combined with the application to transmit the directional second Doppler signal, spectrum image and other data to a remote database or PC for storage, or to a remote professional for analysis. . In addition, the function of positioning information G allows the caregiver to track the current location of the user, which will help home care and elderly care. In a preferred embodiment, the physiological signal measuring system has a wireless communication module for wireless transmission between the devices, and the signals required between the devices such as the Doppler signal and the control signal are mutually transmitted.

The following is a detailed description of an embodiment. Please refer to the first diagram and the second diagram at the same time. The second diagram is a block diagram showing the detailed functions of the physiological signal measurement system according to the embodiment of the present invention. The first control module 240 includes an oscillator 241 and a timing controller 242. The oscillator 241 generates an actuator control signal S according to the control signal C, and the timing controller 242 controls the signal according to the control signal C and the trigger. S generates two trigger control signals S _A and S _B having a phase delay of 180 degrees.

The excitation receiving module 210 can be divided into an excitation circuit, a protection circuit and a receiving circuit, and includes a pulse exciter 211, a cutter 212, a limiter 213, and an amplifier 214. And a filter 215. The pulse exciter 211 is part of the excitation circuit, the chopper 212 and the wave limiter 213 are part of the protection circuit, and the amplifier 214 and the filter 215 are part of the receiving circuit. The pulse igniter 211 is, for example, a bipolar pulser, which can be controlled according to the control signal C of the smart phone and the trigger control signals S _A and S _B generated by the first control module 240. Adjust the value of the excitation center frequency, pulse repetition frequency (PRF), and the number of pulses (Burst cycle) of one of the ultrasonic excitation signals U generated.

In order to enable the ultrasonic excitation signal U to smoothly enter the skin of the user via the transducer device 100, a layer of gel may be applied to the skin of the user to help the ultrasonic excitation signal U penetrate deep into the skin of the user, and according to The flow rate of the blood vessel generates an echo signal U'. The echo signal U' is returned to the Doppler device 200 via the transducer device 100.

The chopper 212 is electrically connected to the pulse exciter 211 and the transducing device 100 for reducing the noise of the ultrasonic excitation signal U and preventing the echo signal U' from entering the pulse exciter 211. The wave limiter 213 is electrically coupled to the chopper 212 to limit the voltage of the echo signal U' to avoid damaging the back end components. The amplifier 214 includes a preamplifier and a variable gain amplifier, and is electrically coupled to the current limiter 213 for receiving the echo signal U' and amplifying it to a sufficient amount for the back end module to process. The filter 215 is, for example, a band pass filter electrically connected to the amplifier 214 to filter out noise in the amplified echo signal U'.

The first processing module 220 processes the echo signal U' to obtain a first Doppler signal having a real signal I and an imaginary signal Q, and the first processing module 220 includes a solution. The modulator 221, a sampler 222 and a filter 223. The demodulator 221 is electrically connected to the excitation receiving module 210, and includes a mixer and a harmonic filter to demodulate the echo signal U' into the first one including the real signal I and the imaginary signal Q. Buller signal. The sampler 222 is electrically connected to the demodulator 221 to sample the real signal I and the imaginary signal Q in the first Doppler signal according to a sampling frequency equal to the pulse repetition frequency. The filter 223 is, for example, a band pass filter and is electrically connected to the sampler 222. Since the first Doppler signal after sampling will generate a high frequency harmonic signal with the same sampling frequency and a low frequency vibration signal generated during the measurement, it is necessary to filter the above two signals by using a band pass filter. .

Since the frequency of the Doppler signal is located in the discernable audio range of the single source of a smart phone, the first Doppler signal can be directly entered into the internal source via the built-in tone source of the smart phone. However, to determine the direction of blood flow, it is necessary to simultaneously process the real signal and the imaginary signal in the Buhler signal. Therefore, the real signal and the imaginary signal must be input to the mono source side simultaneously. In order to solve the problem that the real signal and the imaginary signal are simultaneously input to the single source, a conversion circuit 232 is designed in the second processing module 230 to solve the above problem. Among them, the technology of the conversion circuit 232 adopts a Weaver Receiver Technique (WRT).

The second processing module 230 further includes an amplifier 231. The first Doppler signal including the real signal I and the imaginary signal Q processed by the first processing module 230 is amplified by the amplifier 231, and the signal is amplified by the amplifier 231. A first Doppler signal including a real signal I' and an imaginary signal Q' is generated to facilitate subsequent conversion circuit 232 for processing. Referring to the third figure, the conversion circuit 232 has a quadrature oscillator 233, a multiplier 234, and an adder 235. The quadrature oscillator 233 generates a first orthogonal signal Pi and a second orthogonal signal Pq. The multiplier 234 is electrically connected to the first processing module 220 via the amplifier 231, and is electrically connected to the orthogonal oscillator 232. . The multiplier 234 multiplies the real signal I' of the amplifier 231 by the first orthogonal signal Pi to generate a first frequency I", and multiplies the imaginary signal Q' by the second orthogonal signal Pq. A second frequency Q" is generated. The adder 235 is electrically connected to the multiplier 234, and the first frequency I" and the second frequency Q" are added to form a single audio signal O.

The smart phone 300 can selectively connect to the Doppler device 200 by its tone source terminal 310. In the embodiment, the third processing module 320 includes a data buffer 321 and a spectrum analyzing unit 322. The third processing module 320 receives the single audio signal O via the tone source terminal 310, and converts it into a second Doppler signal O', and stores it in the memory module 360. At the same time, the data buffer 321 will be the second. The Buhler signal O' is temporarily stored, and the spectrum analyzing unit 322 processes the second Doppler signal O' to generate a spectrum image V. The display module 330 is electrically connected to the third processing module 320 to display the spectrum image V. In addition, the display module 330 further includes an output unit 331, and the output unit 331 can output the spectrum image V to the memory module 360 for storage operation.

In an embodiment, the third processing module 320 of the smart phone 300 has a video processing method for processing the second Doppler signal O' to generate the spectral image V. The flowchart is as shown in the fourth figure. The processing method is as follows:

Step (S100): First, the information is initialized.

Step (S101): providing a function icon of the start key on the display module. When the user presses the start key, the step (S102) is performed.

Step (S102): capturing the second Doppler signal.

Step (S103): providing a data buffer to store the second Doppler signal in the data buffer.

Step (S104): Converting the second Doppler signal into a spectrum image by a Fourier transform method.

Step (S105): displaying an instant spectrum image on the display module.

Step (S106): providing a function icon of a stop button and a pause button on the display module, and when the user presses the stop button, the movie processing method is ended.

Step (S107): When the user presses the pause button, the step (S108) is performed.

Step (S108): The third processing module stops capturing the second Doppler signal.

Step (S109): providing a function icon of the storage key on the display module, and when the user presses the storage key, the step (S110) is performed.

Step (S110): storing the spectrum image in the memory module.

Wherein, when the step of performing the video processing method (S102), the method further includes:

Step (S111); providing a function icon of a recording button on the display module.

Step (S112); when the user presses the record button, the third processing module stores the second Doppler signal in the memory module.

Step (S113); at this time, a function icon of a stop button is provided on the display module. When the user presses the stop button, the above steps are ended.

Please refer to the fifth figure, which is a schematic diagram of the implementation of the physiological signal measurement system according to the embodiment of the present invention. The patch type ultrasonic transducing device 100 is fixed to the user's carotid artery by means of a ventilated film, and the Doppler device 200 and the smart phone 300 are simultaneously fixed to the user's hand by a moving arm sleeve. The user can monitor the physiological state of the user at any time by the above fixed method, and the user can set the parameters on the smart phone, and can see the instant Doppler spectrum image and the like on the display module of the smart phone. .

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

100. . . Transducer

200. . . Doppler device

210. . . Excitation receiver module

211. . . Pulser

212. . . Chopper

213. . . Wave limiter

214. . . Amplifier

215. . . filter

220. . . First processing module

221. . . Demodulator

222. . . Sampler

223. . . filter

230. . . Second processing module

231. . . Amplifier

232. . . Conversion circuit

233. . . Orthogonal oscillator

234. . . Multiplier

235. . . Adder

240. . . First control module

241. . . Oscillator

242. . . Timing controller

250. . . Charging unit

300. . . Smart phone

310. . . Mono source

320. . . Third processing module

321. . . Data buffer

322. . . Spectrum analysis unit

330. . . Display module

331. . . Output unit

340. . . Second control module

350. . . Interface module

360. . . Memory module

370. . . External communication module

C. . . Control signal

S, S _A , S _B . . . Exciter control signal

U. . . Ultrasonic excitation signal

U’. . . Echo signal

I, I’. . . Real signal

Q, Q'. . . Imaginary signal

I"...first frequency

Q"...second frequency

O. . . Single audio signal

O’. . . Second Doppler signal

Pi. . . First orthogonal signal

Pq. . . Second orthogonal signal

W. . . Wireless transmission

G. . . Location information

V. . . Spectral image

The first figure is a block diagram of a physiological signal measurement system according to an embodiment of the present invention.

The second figure is a block diagram showing the detailed functions of the physiological signal measurement system according to the embodiment of the present invention.

The third figure is a block diagram of the conversion circuit.

The fourth picture is a flow chart of the audio and video processing method in the smart phone.

The fifth figure is a schematic diagram of the implementation of the physiological signal measurement system according to the embodiment of the present invention.

100. . . Transducer

200. . . Doppler device

210. . . Excitation receiver module

220. . . First processing module

230. . . Second processing module

240. . . First control module

250. . . Charging unit

300. . . Smart phone

310. . . Mono source

320. . . Third processing module

330. . . Display module

340. . . Second control module

350. . . Interface module

360. . . Memory module

370. . . External communication module

C. . . Control signal

U. . . Ultrasonic excitation signal

U’. . . Echo signal

O. . . Single audio signal

W. . . Wireless transmission

G. . . Location information

Claims (10)

A physiological signal measuring system for a smart phone, comprising: a transducing device for attaching to a user's skin; a Doppler device comprising: an excitation receiving module, and a signal connection The device is configured to transmit an ultrasonic excitation signal to the transducer device, and the ultrasonic excitation signal enters the skin of the user through the transducer device to generate an echo signal, and the excitation receiving module is configured to receive The first processing module is connected to the excitation receiving module and processes the echo signal to generate a first Doppler signal; and a second processing module is connected to the signal The first processing module converts the first Doppler signal into a single audio signal; a smart phone has a single sound source terminal, and the signal source is selectively connected to the Doppler by the single sound source terminal The device includes: a third processing module electrically connected to the single tone source to receive the single audio signal, and converted into a second Doppler signal, and processing the second Doppler signal to generate a spectrum Image; and one Illustrates module electrically connected to the third processing module, to display the spectral image. The physiological signal measuring system for a smart phone according to the first aspect of the invention, wherein the Doppler device comprises a first control module electrically connected to the excitation receiving module, the first processing The module and the second processing module, and the smart phone transmits a control signal to the first control module via the single source. The physic signal measuring system for a smart phone as described in claim 2, wherein the smart phone includes: a second control module electrically connected to the single audio source terminal and the third processing module An interface module electrically connected to the second control module for the user to input the control signal, and transmitted to the second control module, the single source terminal and the second processing module a control module; and a memory module electrically connected to the single audio source and the third processing module to store the single audio signal, the second Doppler signal, and the spectrum image. The physiological signal measuring system for a smart phone, as described in claim 2, wherein the first control module includes an oscillator and a timing controller, and the oscillator and the timing controller are configured according to the The control signal generates a trigger control signal. The physiological signal measuring system for a smart phone according to the fourth aspect of the invention, wherein the excitation receiving module comprises: a pulse trigger, the signal is controlled according to the trigger to generate the ultrasonic excitation signal; a chopper, electrically connected to the pulse exciter and the transducing device for reducing noise of the ultrasonic excitation signal and preventing the echo signal from entering the pulse exciter; a wave limiter electrically connecting the a chopper to limit the size of the echo signal; an amplifier electrically connected to the current limiter to amplify the echo signal; and a filter electrically connected to the amplifier to filter the amplified back The noise in the wave signal. The physiological signal measuring system for a smart phone as described in claim 1, wherein the first processing module comprises: a demodulator electrically connected to the excitation receiving module to use the echo The signal is demodulated into the first Doppler signal, wherein the first Doppler signal comprises a real signal and an imaginary signal; a sampler is electrically connected to the demodulator, and the sample is sampled according to a sampling frequency. a first Doppler signal; and a filter electrically connected to the sampler to filter out the high frequency harmonic signal and the low frequency vibration signal in the sampled first Doppler signal. The physiological signal measuring system applied to the smart phone according to the sixth aspect of the invention, wherein the second processing module comprises a conversion circuit, the conversion circuit has a quadrature oscillator, a multiplier and an addition The quadrature oscillator generates a first orthogonal signal and a second orthogonal signal, and the multiplier is electrically connected to the first processing module and the orthogonal oscillator to combine the real signal with the first Multiplying an orthogonal signal to generate a first frequency, and multiplying the imaginary signal by the second orthogonal signal to generate a second frequency, the adder is electrically connected to the multiplier, and the first The frequency and the second frequency are added to form the single audio signal. The physiological signal measuring system applied to a smart phone according to claim 1, wherein the Doppler device further comprises a charging unit. The physiological signal measuring system for a smart phone according to the first aspect of the invention, wherein the third processing module has a video processing method, the audio processing method comprising: capturing the second Doppler signal Providing a data buffer for storing the second Doppler signal; converting the second Doppler signal into the spectrum image by a Fourier transform method; displaying the instantaneous spectrum image in the display module Providing an end button on the display module; and when a user presses the end button, the third processing module stores the spectrum image in a memory module. The physiological signal measuring system for a smart phone as described in claim 9 , wherein the audio processing method further comprises: capturing the second Doppler signal; providing a recording button on the display module When the user presses the record button, the third processing module stores the second Doppler signal in the memory module.