Time-sequential format, a data sequence in which the first sample of channel 1 is followed by the first sample of channel 2, then the first sample of channel 3, etc., until the first sample of all channels is given; then follows the second sample of channel 1, the second sample of channel 2, etc. As opposed to trace-sequential format in which the first sample of channel 1 is followed by the second sample of channel 1, etc., until all of channel 1 is given, followed by channel 2, etc. If an array of data is thought of as a matrix:
the multiplexed format may be thought of as reading by columns and trace-sequential format as reading by rows. The data output of digital recording equipment is usually in multiplexed format whereas most data processing is done in trace-sequential format. Converting from the one format to the other (demultiplexing) is one of the first steps in data processing and usually part of the edit routine. Such a format conversion is called matrix transposition.