REFERENCES
- R Koenig, H K Dunn & L Y Lacey, The sound spectrograph, J Acoust Soc Amer, vol 18, pp 19–49, 1946.
- R K Potter, G A Kopp & H C Green, Visible Speech, Van Nostrand, New York, 1947.
- A V Oppenheim, Speech spectrograms using the fast Fourier transform, IEEE Spectrum, vol 7, pp 57–62, 1970.
- LR Morris, A PC-based digital speech spectrograph, IEEE Micro, vol 8, pp 68–85, 1988.
- S Cheung & J S Lim, Combined multiresolution (wideband/narrowband) spectrogram, IEEE Trans Sig Proc, vol 40, pp 975–977, 1992.
- F J Harris, On the use of windows for harmonic analysis with the discrete Fourier transform, Proc IEEE, vol 66, pp 51–66, 1978.
- L Cohen, Time-frequency distributions-a review, Proc IEEE, vol 77, pp 941–981, 1989.