Signal processing circuit and related chip, flow meter and method

A chip, comprising:

• a signal processing circuit coupled to a first transducer and a second transducer, wherein there is a distance greater than zero between the first transducer and the second transducer, and a fluid having a flow velocity flows sequentially through the first transducer and the second transducer, and the signal processing circuit comprises:
• a first transmitter, coupled to the first transducer;
• a first receiver, coupled to the first transducer;
• a second transmitter, coupled to the second transducer;
• a second receiver, coupled to the second transducer;
• and
• a control unit, coupled to the first transmitter, the first receiver, the second transmitter and the second receiver, wherein the control unit is configured to:
• during an initializing stage, obtain at least two first parameters corresponding to at least two temperatures, at least two second parameters corresponding to the at least two temperatures, and obtain the distance at least according to one of the at least two second parameters;
• and
• during a normal stage, obtain the flow velocity according to the at least two first parameters, the at least two second parameters and the distance without measuring a current temperature by using a temperature sensor;
• wherein the at least two first parameters are related to the distance and a current acoustic speed corresponding to the current temperature;
• the at least two second parameters are related to a delay time of the first transmitter, the first receiver, the second transmitter, the second receiver, the first transducer and the second transducer.

A signal processing method, characterized in that the signal processing method is configured to control a first transmitter, a first receiver, a second transmitter and a second receiver, the first transmitter and the first receiver are coupled to a first transducer, the second transmitter and the second receiver are coupled to a second transducer, wherein there is a distance greater than zero between the first transducer and the second transducer, and a fluid having a flow velocity flows sequentially through the first transducer and the second transducer;

• and the signal processing method comprises:
• during an initializing stage, obtaining at least two first parameters corresponding to at least two temperatures, at least two second parameters corresponding to the at least two temperatures, and obtain the distance at least according to one of the at least two second parameters;
• during a normal stage, obtaining the flow velocity according to the at least two first parameters, the at least two second parameters and the distance without measuring a current temperature by using a temperature sensor;
• wherein the at least two first parameters are related to the distance and a current acoustic speed corresponding to a current temperature;
• the at least two second parameters are related to a delay time of the first transmitter, the first receiver, the second transmitter, the second receiver, the first transducer and the second transducer.