One of the most common digital-signal-processing techniques is the discrete Fourier transform (DFT), which breaks a signal into its component frequencies and can be represented as a matrix.

最常见的数字信号处理技术之一是离散傅立叶变换（DFT），它把一个信号分解成它的组成频率，并表示成一个矩阵。

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Particularly fierce arguments are raging around the Department for Transport (DfT), which must make cuts of 25% or more in its budget.

异常激烈的争论围绕着英国交通部（DfT）进行，因为它必须砍掉25%预算或更甚。

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Appendix 1 - Fortran DFT source program.

附录1—Fortran DF t源程序。

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Shadow transport secretary Maria Eagle said it was not appropriate that the investigation will be carried by a DfT non-executive director.

BBC: West Coast Main Line bid probe 'must be external'

An independent report last year by Sam Laidlaw - chief executive of Centrica, the owner of British Gas - found there was a "damning failure" by the DfT that led to ministers - who had not been told about flaws in the bidding process - awarding the contract after being given inaccurate reports.

BBC: West Coast Main Line fiasco caused by 'major failures'

Mr Laidlaw, who is a non-executive director of the DfT, is due to give evidence to the House of Commons transport committee next week.

BBC: Rail line