Analog digital converter and program therefor

An analog-to-digital conversion apparatus correcting digital signals output from a plurality of analog-to-digital converters that is provided in parallel and samples analog signals in different timing by a predetermined phase, the analog-to-digital conversion apparatus comprising:

• a plurality of data inserting units that is provided corresponding to the analog-to-digital converters besides a predetermined reference analog-to-digital converter among the plurality of analog-to-digital converters and outputs zero-inserted data that is made by respectively inserting data with data value zero between the digital data output from the respectively corresponding analog-to-digital converters by a predetermined number;
• a synthesizing unit that respectively synthesizes the zero-inserted data;
• a plurality of first filter units that is provided corresponding to the analog-to-digital converters besides a predetermined reference analog-to-digital converter among the plurality of analog-to-digital converters, has a filter coefficient based on a first correction coefficient of a frequency domain to be multiplied by a signal within the corresponding frequency domain so that a spurious component caused by the frequency characteristics of the plurality of analog-to-digital converters is removed when converting each of the zero-inserted data into the signal within the frequency domain to synthesize the signals, and passes through the corresponding zero-inserted data to supply the data to said synthesizing unit;
• and
• a second filter unit that has the filter coefficient based on a second correction coefficient to correct a phase error of the signal within the frequency domain, which is caused by multiplying the signal within the frequency domain by the first correction coefficient, and passes through the data output from said synthesizing unit to generate the digital signal.

A program stored on a recordable medium executable so as cause an analog-to-digital conversion apparatus to correct digital signals output from a plurality of analog-to-digital converters that is provided in parallel and samples analog signals in different timing by a predetermined phase, the program causing the analog-to-digital conversion apparatus function as:

• a plurality of data inserting units that is provided corresponding to the plurality of analog-to-digital converters and outputs zero-inserted data that is made by respectively inserting data with data value zero between the digital data output from the respectively corresponding analog-to-digital converters by a predetermined number;
• a synthesizing unit that respectively synthesizes the zero-inserted data to generate the digital signal;
• and
• a plurality of filter units that is provided corresponding to the plurality of analog-to-digital converters, has filter coefficients based on a frequency characteristic of each of the analog-to-digital converters so that the digital signal generated form said synthesizing unit is a digital signal obtained when the frequency characteristics of the plurality of analog-to-digital converters are the same as one another, and passes through the corresponding zero-inserted data to supply the data to said synthesizing unit.

A program stored on a recordable medium executable so as to cause an analog-to-digital conversion apparatus to correct digital signals output from a plurality of analog-to-digital converters that is provided in parallel and samples analog signals in different timing by a predetermined phase, the program causing the analog-to-digital conversion apparatus function as:

• a plurality of data inserting units that is provided corresponding to the plurality of analog-to-digital converters and outputs zero-inserted data that is made by respectively inserting data with data value zero between the digital data output from the respectively corresponding analog-to-digital converters by a predetermined number;
• a synthesizing unit that respectively synthesizes the zero-inserted data;
• a plurality of first filter units that is provided corresponding to the analog-to-digital converters besides a predetermined reference analog-to-digital converter among the plurality of analog-to-digital converters, has a filter coefficient based on a first correction coefficient of a frequency domain to be multiplied by a signal within the corresponding frequency domain so that a spurious component caused by the frequency characteristics of the plurality of analog-to-digital converters is removed when converting each of the zero-inserted data into the signal within the frequency domain to synthesize the signals, and passes through the corresponding zero-inserted data to supply the data to said synthesizing unit;
• and
• a second filter unit that has the filter coefficient based on a second correction coefficient to correct a phase error of the signal within the frequency domain, which is caused by multiplying the signal within the frequency domain by the first correction coefficient, and passes through the data output from said synthesizing unit to generate the digital signal.