生理訊號之量測系統

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

098120768

專利證號

I 409052

專利獲證名稱

生理訊號之量測系統

專利所屬機關 (申請機關)

國立成功大學

獲證日期

2013/09/21

技術說明

一般生理訊號大多很低頻，以量測心室阻抗為例，包含諧波在內也不會超過100 Hz，但為了避免與生物體內的其他電訊號干擾，如神經訊號(ENG)，在量測時，一般是注入一頻率為數十kHz的交流電流訊號，再量測其對應之電壓訊號的振幅與相位，換算出其阻抗值。若以數位方式擷取，用傳統數位訊號處理方式，則前端的類比-數位轉換器的取樣頻率與儀器的工作時脈必須非常高，以致於大多數擷取與量測時變生醫訊號的系統，尤其是需要量測相位的儀器，是以類比的方式處理訊號，最好的例子是「電導心導管量測儀器」。 我們提出了一種新的數位生醫訊號處理方法，與以DSP晶片為主建構的儀器，可以有效地以較低的取樣頻率，達到高相位解析度。 The frequencies of most biosignals are typically very low. Take cardiac impedance signal as an example, its frequencies are less than 100 Hz, including its harmonics. However, to avoid the interference with other biosignals, such as ENG, the typical measurement method is to inject an ac current signal with an order of tens of kilohertz, and measure the magnitude and phase of its corresponding voltage signal. Accordingly, its impedance can be calculated. If the digital acquisition and processing method is used, the sampling rate of the front-end ADC and the clock of the instrument will be extremely high. Therefore, most instruments designed for acquiring and processing time-varying biosignals are made by analog circuits, especially the ones with phase measurement. The best example is the conductance catheter measurement system. A novel method of digitally processing biosignals and a DSP-based instrument are proposed. High phase resolution can be achieved with a reduced sampling rate.

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