Orthogonal signal quadruplicated frequency counting method with filter function
A quadrature signal, counting method technology, applied in electrical components, pulse technology and other directions, can solve the problems of counting errors, interference, lack of filtering function, etc., to overcome the loss of counting and shield electromagnetic interference.
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specific Embodiment approach 1
[0019] Specific implementation mode one: combine figure 1 Describe the present embodiment, the quadrature signal quadruple frequency counting method with filtering function described in the present embodiment, it comprises the steps:
[0020] Step 1: Initialize the counter, the A signal shift register and the B signal shift register. The storage spaces of the A signal shift register and the B signal shift register are both 4 bits, and the A signal shift register is used to store a cycle The A signal in the quadrature signal, the B signal shift register is used to store the B signal in the quadrature signal of one cycle;
[0021] Step 2: When the clock signal CLK is rising, go to Step 3;
[0022] Step 3: The A signal shift register and the B signal shift register shift one bit at the same time, and go to step 4;
[0023] Step 4: According to the A signal of one period stored in the current A signal shift register, it is judged whether the A signal is a rising edge at the curr...
specific Embodiment approach 2
[0034] Specific embodiment two: this embodiment is a further limitation of the quadrature frequency counting method for quadrature signals with filtering function described in specific embodiment one,
[0035] In step 4, the method of judging whether the A signal at the current moment is a rising edge according to the A signal of one cycle stored in the current A signal shift register is: if the A signal of one cycle stored in the A signal shift register is 0011, then It is judged that the A signal is a rising edge, and if not, it is judged that the A signal is not a rising edge.
specific Embodiment approach 3
[0036] Specific embodiment three: this embodiment is a further limitation of the quadrature frequency counting method for quadrature signals with filtering function described in specific embodiment one,
[0037] In step 6, the method of judging whether the A signal at the current moment is a falling edge according to the A signal of one cycle stored in the current A signal shift register is: if the A signal of one cycle stored in the A signal shift register is 1100, then It is judged that the A signal is a falling edge, and if not, it is judged that the A signal is not a falling edge.
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