Abstract: A multifunctional backpack with adjustable shoulder strap is provided, which includes a backpack body and a shoulder strap. A lower of the shoulder strap is connected to the backpack body, and there are two or more sheet bodies extending along a transverse direction of the backpack body on an upper of the backpack body. Two sides of the sheet bodies are connected to the backpack body, and an insertion hole is formed between middles of the sheet bodies and the backpack body. A hook buckle is connected to an upper of the shoulder strap; the hook buckle includes a hook buckle main body and a hook buckle connector. One end of the shoulder strap is connected to the hook buckle main body, and a bottom of the hook buckle main body and a bottom of the hook buckle connector are connected by a bottom plate.

Abstract: A multifunctional backpack with adjustable shoulder strap is provided, which includes a backpack body and a shoulder strap. A lower of the shoulder strap is connected to the backpack body, and there are two or more sheet bodies extending along a transverse direction of the backpack body on an upper of the backpack body. Two sides of the sheet bodies are connected to the backpack body, and an insertion hole is formed between middles of the sheet bodies and the backpack body. A hook buckle is connected to an upper of the shoulder strap; the hook buckle includes a hook buckle main body and a hook buckle connector. One end of the shoulder strap is connected to the hook buckle main body, and a bottom of the hook buckle main body and a bottom of the hook buckle connector are connected by a bottom plate.

Abstract: An ultrasound imaging receiver circuit includes a plurality of amplifiers configured to receive input signals from a plurality of ultrasound transducer channels respectively; a plurality of ADCs connected with the amplifiers respectively; a switching circuit connected with the ADCs; an image signal processor connected with the switching circuit; and a control signal generator. Each amplifier includes a first input port configured for receiving one input signal from an ultrasound transducer channel, a second input port connected to the ground and an output port connected to one ADC, the first input port being connected to the output port through a first switch. The control signal generator is configured to compare the input signal with a first preset threshold and a second preset threshold and output control signals controlling the first switch and the second switch based on the comparisons.