Alternate window compression/decompression method, apparatus, and system

A compression method, comprising:

• setting, with respect to data having periodicity to be compressed, windows of the same size for every plurality of sections according to a period of the data,
• sequentially performing processing for sorting sample data alternately among the set windows of the same size, and
• applying processing for sequentially detecting sampling points where all errors between a data value on a straight line connecting data of two sampling points and each sample data value in the same sampling point as each data value on the straight line are equal to or less than a desired value,
• which are sampling points where a time interval between said two sampling points is the longest within a predetermined range, as sample points of the compression data to data obtained by the sorting processing.

A compression method, comprising:

• setting, with respect to data having periodicity to be compressed, windows of the same size for every plurality of sections according to a period of the data,
• sequentially performing processing for sorting sample data alternately among the set windows of the same size, and
• applying processing for sequentially detecting sampling points where an error between a data value on a straight line connecting data of two sampling points and a sample data value in the same sampling point as the data value on the straight line is equal to or less than a desired value,
• which are sampling points immediately preceding sampling points where said error exceeds said desired value, as sample points of the compression data to data obtained by the sorting processing.

A compression apparatus, comprising:

• sorting means for, with respect to data having periodicity to be compressed, setting windows of the same size for every plurality of sections according to a period of the data;
• means for sequentially performing processing for sorting sample data alternately among the set windows of the same size;
• and
• compressing means for applying compression processing to data obtained by said sorting means.

A compression apparatus, comprising:

• sorting means for, with respect to data having periodicity to be compressed, setting windows of the same size for every plurality of sections according to a period of the data,
• processing means for sequentially performing processing for sorting sample data alternately among the set windows of the same size;
• and
• linear compression means for applying processing for sequentially detecting sampling points where, when data of two sampling points are subjected to linear interpolation, an error between the interpolated data and original data is equal to or less than a desired value, as sample points of the compression data to data obtained by said sorting means.

A compression/decompression system, comprising:

• on a compression side, with respect to data having periodicity to be compressed, means for setting windows of the same size for every plurality of sections according to a period of the data,
• means for sequentially performing processing for sorting sample data alternately among the set windows of the same size, and
• means for applying compression processing to data obtained by the processing and obtaining compression data, and
• on a decompression side, means for applying decompression processing corresponding to said compression processing to said compression data,
• means for setting windows of the same size for said every plurality of sections for data obtained by the processing, and
• means for sequentially performing processing for sorting said data alternately among the set windows of the same size and obtaining decompression data.

A compression/decompression system, comprising:

• on a compression side, with respect to data having periodicity to be compressed, means for setting windows of the same size for every plurality of sections according to a period of the data,
• means for sequentially performing processing for sorting sample data alternately among the set windows of the same size, and
• means for applying processing for sequentially detecting sampling points where, at the time when linear interpolation is applied to data of two sampling points, an error between interpolated data and original data is equal to or less than a desired value as sample points to data obtained by the processing,
• said means for applying processing obtaining amplitude data of each sample point and timing data representing a time interval between said each sample point as compression data, and
• on a decompression side, means for using amplitude data of each sample point included in said compression data and timing data representing a time interval between said each sample point to find interpolation data for interpolating amplitude data having a time interval indicated by said timing data and,
• means for setting windows of the same size for said every plurality of sections based on said pitch data and sequentially performing processing for sorting said interpolation data alternately among the set windows of the same size, and
• means for obtaining decompression data.