Signal processing apparatus and method

A signal processing apparatus comprising:

• a controller configured to generate control data based on an edge at which a value of a digital data to be transmitted is changed, wherein the control data is used for controlling frequency modulation to a carrier signal;
• frequency modulation circuitry configured to perform the frequency modulation to the carrier signal on the basis of the control data generated by the controller;
• and
• transmission circuitry configured to transmit, as a transmission signal, the carrier signal to which the frequency modulation is performed by the frequency modulation circuitry,
• wherein the controller is configured to perform edge detection that detects the edge at which the value of the digital data is changed, and edge data generation that generates, as the control data, edge data indicating a position of the edge detected by the edge detection at a time interval shorter than a time interval of the edge in the digital data,
• the controller is configured to perform data conversion that converts the digital data such that a time average of the edge in the digital data is constant, and
• the edge detection detects the edge in the digital data converted by the data conversion.

A signal processing apparatus, comprising:

• a controller configured to generate control data based on an edge at which a value of a digital data to be transmitted is changed, wherein the control data is used for controlling frequency modulation to a carrier signal,
• frequency modulation circuitry configured to perform the frequency modulation to the carrier signal on the basis of the control data generated by the controller;
• and
• transmission circuitry configured to transmit, as a transmission signal, the carrier signal to which the frequency modulation is performed by the frequency modulation circuitry,
• wherein the controller is configured to perform edge detection that detects the edge at which the value of the digital data is changed, and edge data generation that generates as the control data, edge data indicating a position of the edge detected by the edge detection at a time interval shorter than a time interval of the edge in the digital data, wherein
• the edge data generation generates the edge data indicating the position of the edge by a pulse, and
• the controller is configured to perform polarity adjustment that adjusts a polarity of the pulse in the edge data generated by the edge data generation such that a rate of each polarity is equal.