Apparatus for changing coefficients utilized to perform a convolution operation having address generator which uses initial count number and up/down count inputs received from external

A digital signal processing circuit which performs convolution processing using stored coefficients on sampling data, said digital signal processing circuit comprising:

• coefficient storage means for storing said coefficients;
• coefficient input means for sequentially receiving new coefficients;
• address generating means for generating a sequence of write addresses for said coefficient storage means by incrementing or decrementing an initial number in accordance with control data received from an external source, said control data defining said initial number and an amount of said incrementing or decrementing;
• and
• writing control means for controlling said coefficient input means such that said new coefficients are written into said coefficient storage means at locations corresponding to said write addresses generated by said address generating means.

A digital signal processing circuit that performs convolution processing using stored coefficients on sampling data, said digital signal processing circuit comprising:

• coefficient storage means for storing said coefficients;
• coefficient input means for sequentially receiving new coefficients;
• address generating means for generating a sequence of write addresses for said coefficient storage means by incrementing or decrementing an initial number received from an external source in accordance with an up/down count indicator received from an external source, said initial number corresponding to a first write address in said sequence of write addresses to be generated and said up/down count indicator indicating whether said sequence of write addresses is to be generated by incrementing or decrementing said initial number;
• and
• writing control means for controlling said coefficient input means such that said new coefficients are written into said coefficient storage means at locations corresponding to said write addresses generated by said address generating means.