Interpolation filter system implemented by digital circuit

An interpolation filtering system implemented by a digital circuit, comprising an interpolation filtering operation controller, cascaded drive modules, an intermediate result cache Random Access Memory (RAM), and a filter coefficient storage Read Only Memory (ROM), wherein the interpolation filtering operation controller comprises cascaded filter operation modules and a master state machine;

• the intermediate result cache RAM is configured to store externally input data of the interpolation filtering system and intermediate results calculated by a filter operation module of each stage of the interpolation filter calculation controller;
• the filter coefficient storage ROM is configured to store filter coefficients required for calculation by the filter operation module of each stage of the interpolation filter calculation controller;
• the cascaded drive modules comprise a counter configured to control the interpolation filtering operation controller to read and write the intermediate result cache RAM and the filter coefficient storage ROM;
• and
• the interpolation filtering operation controller is configured to control, under drive of counting beats output by the cascaded drive modules, the master state machine to select data which is cached in the intermediate result cache RAM or data is input externally directly, and send to the cascaded filter operation modules for performing an accumulation operation, and meanwhile, also control the master state machine to select the filter coefficients of the filter coefficient storage ROM and send to the cascaded filter operation modules for performing a multiplication operation, thereby achieving an objective of interpolation filtering after the processing by the cascaded filter operation modules.