Abstract: A signal processing apparatus having a register unit with the number of bits required for signal processing, which is not larger than predetermined number of bits, and comprising a ROM which inputs, as an address signal, an output signal from the register unit or an input signal to the signal processing apparatus, and uses an input signal to the register unit as a part of an output signal from the ROM. This makes it possible to greatly reduce the cost of a system which executes complex processing yet requires a reduced number of bits in the input signals and a reduced number of bits for the register that is essentially required by reducing the amount of signal processing and the number of electric components, to greatly improve the quality of the apparatus accompanying the reduction in the number of electric components, and to cheaply increase the signal processing functions without decreasing the processing speed.

Abstract: A signal processing apparatus having a register unit with the number of bits required for signal processing, which is not larger than predetermined number of bits, and comprising a ROM which inputs, as an address signal, an output signal from the register unit or an input signal to the signal processing apparatus, and uses an input signal to the register unit as a part of an output signal from the ROM. This makes it possible to greatly reduce the cost of a system which executes complex processing yet requires a reduced number of bits in the input signals and a reduced number of bits for the register that is essentially required by reducing the amount of signal processing and the number of electric components, to greatly improve the quality of the apparatus accompanying the reduction in the number of electric components, and to cheaply increase the signal processing functions without decreasing the processing speed.