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A continuously scanning FT spectrometer (Bruker IFS 120 HR) has been applied for observing time-resolved spectra after pulse phenomena by a multi-sampling method with a help of a chip computer SX} \textbf{369}, 293(2003)}. In the present study, we used a pulse discharge with a duration of 40 $\mu$sec in a mixture of N$2$ (120 mTorr) and CH$4$ (15 mTorr) to produce HNC and HCN emissions which were monitored by the $\nu$$1$ bands (C-H stretch in HCN or NH stretch in HNC) with a resolution of 0.06 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$. The cell was cooled down by liquid nitrogen or dryice. Thirty data were collected to produce 30 interferograms with a 2 $\mu$sec interval. The emission intensities from v$1$ = 1 of HCN and HNC decreased for 15 $\mu$sec after turning off the discharge and increased later. The emission from v$1$ = 2 of HCN showed similar time profile as the v$1$ = 1 emission. However, the emission from v$2$=2 of HNC showed a different time profile.