ppg circuit, biometric detection device and biometric detection method
A technology of biological characteristics and detection methods, applied in the direction of measuring devices, using electric/magnetic devices to transfer sensing components, using optical devices to transfer sensing components, etc., can solve problems affecting the accuracy of biometric detection and improve accuracy , The effect of reducing power consumption
Active Publication Date: 2022-07-29
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology
During the measurement process, the photoelectric converter of the biometric detection device may not be placed exactly in the position rich in blood vessels, or during the test, the relative displacement between the biometric detection device and the human body will affect the use of the biometric detection device. for the accuracy of biometric detection
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[0011] When photoplethysmogram (PPG) is used to measure pulse cycle or cardiac blood oxygen, light is used to illuminate the skin to detect the volume change of blood perfusion in the dermis and subcutaneous tissue. The amount of light absorbed also changes, and the subcutaneous blood plethysmogram can be obtained from the measured reflected light intensity to reflect the heart rate and cardiac blood oxygen status. Biometric detection devices generally use multiple photoelectric converters to correspond to multiple positions, and each pulse repetition period T PF In each pulse repetition period T PF Subcutaneous plethysmograms were collected from multiple different locations at one time.
[0012] In the way of sampling multiple photoelectric converters in turn, it is necessary to drive the light source to emit light when sampling each photoelectric converter, that is, each pulse repetition period needs to drive the light source multiple times to sample multiple photoelectric ...
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The present application discloses a PPG circuit (103), a biological feature detection device and a biological feature detection method. The PPG circuit is used to control the light source and N photoelectric converters to sense the biological characteristics of the object to be detected (101). And the N photoelectric converters are divided into K groups of photoelectric converter groups, and the K receiving channels are respectively corresponding to the K groups of photoelectric converter groups; and a controller (106) for controlling the PPG circuit to operate in part. A sampling stage or all sampling stages to generate J or K biometric sampling results per said pulse repetition period (D R ).
Description
technical field [0001] The present application relates to a photoplethysmogram (PPG) circuit, and in particular, to a PPG circuit, a biometric detection device and a biometric detection method that can utilize multiple receive channels to reduce power consumption and improve accuracy. Background technique [0002] Biometric detection devices have good application prospects in biometric detection, such as human blood pressure, blood flow, blood oxygen, brain oxygen, muscle oxygen, blood sugar, microcirculation peripheral blood vessel pulse rate, respiration rate and respiratory capacity. The PPG front-end processing module is an important part of these wearable non-invasive testing instruments. During the measurement process, the photoelectric converter of the biometric detection device may not be placed in a position rich in blood vessels, or during the test, the biometric detection device and the human body have a relative displacement, which affects the use of the biometri...
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IPC IPC(8): G01N21/17G01D5/14G01D5/34
CPCG01N21/17G01D5/14G01D5/34G01N2021/174A61B5/02427A61B2560/0209A61B5/02416A61B5/02108A61B5/14552A61B5/0261A61B5/0059A61B5/7225A61B2562/0233A61B5/307A61B5/6802
Inventor 黄思衡王文祺
Owner SHENZHEN GOODIX TECH CO LTD