Drive circuit
As one embodiment a drive circuit is disclosed. When a three-value signal including a value representing zero is input, the drive circuit outputs two two-value signals that drive two drive elements such that the difference between values representing the two two-value signals corresponds to a value representing the input three-value signal. When the value of the input three-value signal represents zero, output signals are determined in accordance with the input history of the three-value signal. The drive circuit may also be provided with a memory that records a flag value that is reversed in accordance with the input history of the input three-value signal, and the combination of the output two two-value signals being determined in accordance with the flag.
1. A drive circuit to which a three-value signal including a value representing 0 is input, and which outputs two two-value signals for driving two drive elements such that a difference between the values representing the two two-value signals corresponds to a value representing the three-value signal, which is input,
the drive circuit is connected to a logic circuit being input the three-value signal and a memory storing a flag value of the first flag determined based on the three-value signal input to the logic circuit,
the drive circuit determining a combination of the two two-value signals, which are output, according to the flag value of the first flag stored in the memory and a value of the three-value signal, which is input to the logic circuit, in the case where the value of the three-value signal represents 0.
2. The drive circuit according to claim 1 , further comprising the memory, wherein the flag value is inverted according to an input history of the three-value signal, and the combination of the two two-value signal being determined according to the flag value.
3. The drive circuit according to claim 2 , wherein the flag value is inverted when the three-value signal currently input has a value not representing 0 and the three-value signal previously input has a value representing 0.
4. The drive circuit according to claim 1 , further comprising the memory further configured to store a flag value of a second flag, wherein
the flag value of the first flag being inverted when a three-value signal having a value except 0 is input after a three-value signal having a value representing 0 is input,
the flag value of the second flag being inverted when the first flag is inverted, and
the drive circuit determining the combination of the two two-value signal according to the combination of the first and second flag.
5. The drive circuit according to claim 1 , further comprising a counter configured to count a number of times in which one of combination of the two two-value signal is output when a three-value signal having a value except 0 is input, the drive circuit determining the combination of the two two-value signal according to a value of the counter.
6. An operation method of a drive circuit comprising:
inputting a three-value signal including a value representing 0, and
outputting two two-value signals for driving two drive elements such that a difference between the values representing the two two-value signals corresponds to a value representing the three-value signal,
the drive circuit is connected to a logic circuit being input the three-value signal and a memory storing a flag value of a first flag determined based on the three-value signal input to the logic circuit,
the drive circuit determining a combination of the two two-value signals, which are output, according to the flag value of the first flag stored in the memory and a value of the three-value signal, which is input to the logic circuit, in the case where the value of the three-value signal represents 0.