Hardware implemented moving average processor

A device for finding a moving average of a series of data sampled at a predetermined sampling period, comprising:

• first delay means for sequentially receiving said series of data and for delaying each of the data by a time period corresponding to N sampling periods to output a result of the delay, N being an integer, wherein said first delay means comprises a plurality of cascade-connected delay circuit means;
• adding means having one input receive sequentially each data of said series of data;
• second delay means for delaying an output of said adding means by a time period corresponding to one sampling period to output a result of the delay;
• subtracting means for carrying out subtraction between an output of said second delay means and an output of said first delay means, said adding means having the other input receive the output of said subtracting means for adding the data supplied to said one input and said subtracting means output to output a result of the addition;
• means for dividing an output of said subtracting means by a coefficient (N-1) to produce a moving average output of said device;
• selecting means for selectively passing one output from said plurality of cascade-connected delay circuit means to said subtracting means, and
• control means responsive to a moving average term number instructing signal for generating a signal for defining a selecting operation of said selecting means and a division coefficient for said dividing means.

A system for digitally processing an analog signal applied from a signal source, comprising:

• means for sampling the analog signal from said signal source at a predetermined sampling period to convert the sampled signal into digital signal data;
• moving average processing means for carrying out moving average processing on an output of said converting means to produce a moving average output;
• and
• means for carrying out predetermined data processing of said moving average output,
• said moving average processing means comprising
• first delay means for receiving output data of said converting means in series and delaying the received data by a time period corresponding to N sampling periods to output the delayed data, N being an integer,
• adding means having one input receive the output data of said converting means in series,
• second delay means for delaying an output of said adding means by a time period corresponding to one sampling period to output a result of the delay,
• means for carrying out subtraction between an output of said second delay means and that of said first delay means, and
• means for dividing an output of said subtracting means by a coefficient (N-1) to produce said moving average output,
• said adding means having the other input receive the output of said subtracting means, and adding the data supplied to said one input and said subtracting means output to output a result of the addition.

A method of finding a moving average of a series of data sampled at a predetermined sampling period, comprising the steps of:

• delaying each of the data in said series of data by a time period corresponding to N sampling periods, N being an integer;
• performing adding operation on the data delayed by the time period corresponding to said N sampling periods;
• delaying the data added in said adding step by a time period corresponding to one sampling period;
• performing subtracting operation between the data delayed by the time period corresponding to said N sampling periods and the data delayed by the time period corresponding to said one sampling period;
• and
• dividing data obtained in said subtracting step by a coefficient (N-1),
• said adding step comprising the step of adding the data obtained in said subtracting step and the data delayed by the time period corresponding to said N sampling periods.