CN-121982753-A - Ultrasonic detection method and ultrasonic detection device

CN121982753ACN 121982753 ACN121982753 ACN 121982753ACN-121982753-A

Abstract

The embodiment of the invention relates to the technical field of fingerprint identification, and discloses an ultrasonic detection method and an ultrasonic detection device. The ultrasonic detection method comprises the steps of responding to a main control signal, starting operation of an ultrasonic detection device, generating and sending a boosting signal, a control signal and a sampling driving configuration signal by an ultrasonic receiving and sending driving circuit, enabling the boosting signal and the control signal and the sampling driving configuration signal to work in the same clock domain, controlling an ultrasonic transduction array to send out ultrasonic waves by a signal generating circuit according to the boosting signal and the control signal, sampling echo signals of the ultrasonic transduction array by an ADC module according to the sampling driving configuration signal to obtain sampling data, and receiving the sampling data by a signal receiving circuit. Each signal used in the ultrasonic detection process works in the same clock domain, so that the synchronism of each signal work in the ultrasonic detection is improved, and the ultrasonic detection effect is improved.

Inventors

Meng Ziqin
ZHANG YAOGUO
SHI JUNLIANG
ZHU YANQING
XIA BO

Assignees

基合半导体（宁波）有限公司

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (10)

1. An ultrasonic testing method, applied to an ultrasonic testing device, comprising: responding to the main control signal, and starting the operation of the ultrasonic detection device; The ultrasonic receiving and transmitting driving circuit generates and transmits a boosting signal, a control signal and a sampling driving configuration signal, wherein the boosting signal and the control signal and the sampling driving configuration signal both work in the same clock domain; the signal generating circuit controls the ultrasonic transduction array to emit ultrasonic waves according to the boosting signal and the control signal; the ADC module samples echo signals of the ultrasonic transduction array according to the sampling driving configuration signals to obtain sampling data; The signal receiving circuit receives the sampled data.
2. The ultrasonic testing method of claim 1, wherein the ultrasonic transceiver driving circuit generating and transmitting the boost signal, the control signal comprises: the ultrasonic receiving and transmitting driving circuit sends a boosting signal to the signal generating circuit; After a first preset time interval, the ultrasonic receiving and transmitting driving circuit box sends the control signal through the signal generating circuit.
3. The ultrasonic detection method according to any one of claims 1 to 2, wherein the ultrasonic transmission-reception drive circuit transmitting the sampling drive configuration signal includes: after the ultrasonic transceiver driving circuit sends the control signal, the ultrasonic transceiver driving circuit sends the sampling driving configuration signal to the ADC module after a second preset time interval; the second preset time value is an integer multiple of the sampling period of the ADC module.
4. The ultrasonic detection method according to claim 1, characterized by further comprising, before the signal receiving circuit receives the sampling data: The ultrasonic receiving and transmitting driving circuit generates and transmits a signal receiving driving signal, wherein the transmission time of the signal receiving driving signal is later than the sampling driving configuration signal, and the interval time is a third preset time; the signal receiving circuit performs a receiving action of the sampling data in response to the signal receiving driving signal.
5. The ultrasonic testing method according to claim 4, wherein, The third preset time is determined according to the sampling period of the ADC module and the frequency of the system clock.
6. The ultrasonic detection method according to claim 1, characterized by further comprising, after the signal receiving circuit receives the sampling data: Storing the sampling data by using a buffer queue; And notifying a main control to receive the sampling data stored in the buffer queue when the storage amount of the sampling data in the buffer queue reaches a preset value.
7. The ultrasonic detection method according to claim 6, characterized by further comprising, after the signal receiving circuit receives the sampling data: Filtering the sampled data; and carrying out normalization processing on the sample data after the filtering processing.
8. The ultrasonic testing method according to claim 1, further comprising, after the ultrasonic transceiver driving circuit transmits the boost signal: the ultrasonic receiving and transmitting driving circuit sends a dummy data write enabling signal to the cache queue; the cache queue writing a dummy signal in response to the dummy data write enable signal; After the storage amount of the dummy data in the cache queue reaches a preset value, notifying a main control to receive the data stored in the cache queue; when the main control is detected to receive the data stored in the buffer queue, the ultrasonic receiving and transmitting driving circuit sends the control signal to the signal generating circuit.
9. An ultrasonic detection device is characterized by comprising an ultrasonic receiving and transmitting driving circuit, a signal generating circuit, an ultrasonic transduction array, an ADC module and a signal receiving circuit, wherein the ultrasonic detection device is used for executing the ultrasonic detection method according to any one of claims 1 to 8.
10. The ultrasonic testing device of claim 9, further comprising a buffer queue.

Description

Ultrasonic detection method and ultrasonic detection device Technical Field The invention relates to the technical field of fingerprint identification, in particular to an ultrasonic detection method and an ultrasonic detection device. Background The ultrasonic sensor is a device for mutually converting acoustic energy and electric energy, ultrasonic signals are sent by the ultrasonic sensor, echo signals reflected by fingers of a user are received by the ultrasonic sensor, fingerprint identification can be achieved according to the echo signals, and therefore the ultrasonic sensor is widely applied to biological identification devices. However, when the ultrasonic sensor performs fingerprint detection, there is at least a problem in that since the driving circuit for ultrasonic signal transmission and the receiving circuit for echo signal are respectively provided in different chips, complex synchronization processing is required between the chips in order to ensure time synchronization of signal transmission and echo signal reception. And due to the influence of wiring and the like between chips, delay effect can appear in signal transmission between the chips, and the delay effect can influence the synchronous effect. Disclosure of Invention The embodiment of the invention aims to provide an ultrasonic detection method and an ultrasonic detection device, which are used for operating all signals used in the ultrasonic detection process in the same clock domain, so that the synchronism of the operation of all signals in the ultrasonic detection is improved, and the ultrasonic detection effect is improved. In order to solve the technical problems, the embodiment of the invention provides an ultrasonic detection method, which comprises the steps of responding to a main control signal, starting operation of an ultrasonic detection device, generating and sending a boosting signal, a control signal and a sampling driving configuration signal by an ultrasonic receiving and sending driving circuit, wherein the boosting signal and the control signal and the sampling driving configuration signal are all operated in the same clock domain, controlling an ultrasonic transduction array to send out ultrasonic waves by a signal generating circuit according to the boosting signal and the control signal, sampling echo signals of the ultrasonic transduction array by an ADC module according to the sampling driving configuration signal to obtain sampling data, and receiving the sampling data by a signal receiving circuit. The embodiment of the invention also provides an ultrasonic detection device which comprises an ultrasonic receiving and transmitting driving circuit, a signal generating circuit, an ultrasonic transduction array, an ADC module and a signal receiving circuit, wherein the ultrasonic detection device is used for executing the ultrasonic detection method. Compared with the related art, the application has the advantages that the signal generating circuit and the signal receiving circuit are arranged in the same chip, and the signal generating circuit and the signal receiving circuit are controlled simultaneously through the ultrasonic receiving and transmitting driving circuit, so that the complex synchronization problem is avoided, the robustness of ultrasonic detection is enhanced, and the accuracy is higher. In addition, the ultrasonic receiving and transmitting driving circuit generates and transmits a boosting signal and a control signal, wherein the ultrasonic receiving and transmitting driving circuit transmits the boosting signal to the signal generating circuit, and the signal generating circuit transmits the control signal after a first preset time interval. In addition, the ultrasonic transceiver driving circuit sends the sampling driving configuration signal comprises the step that after the ultrasonic transceiver driving circuit sends the control signal, the ultrasonic transceiver driving circuit sends the sampling driving configuration signal to the ADC module after a second preset time interval, wherein the second preset time value is an integral multiple of the sampling period of the ADC module. In addition, before the signal receiving circuit receives the sampling data, the ultrasonic receiving and transmitting driving circuit generates and transmits a signal receiving driving signal, the transmission time of the signal receiving driving signal is later than the sampling driving configuration signal, the interval time is a third preset time, and the signal receiving circuit responds to the signal receiving driving signal to execute the receiving action of the sampling data. In addition, the third preset time is determined according to the sampling period of the ADC module and the frequency of the system clock. In addition, after the signal receiving circuit receives the sampling data, the signal receiving circuit further comprises the steps of utilizing a buffer queue to store the sampling data