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diff --git a/src/spectral/tss.h b/src/spectral/tss.h
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+/*
+  Copyright (C) 2003-2013 Paul Brossier <piem@aubio.org>
+
+  This file is part of aubio.
+
+  aubio is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  aubio is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+/** \file
+
+  Transient / Steady-state Separation (TSS)
+
+  This file implement a Transient / Steady-state Separation (TSS) as described
+  in:
+
+  Christopher Duxbury, Mike E. Davies, and Mark B. Sandler. Separation of
+  transient information in musical audio using multiresolution analysis
+  techniques. In Proceedings of the Digital Audio Effects Conference, DAFx-01,
+  pages 1--5, Limerick, Ireland, 2001.
+
+  Available at http://www.csis.ul.ie/dafx01/proceedings/papers/duxbury.pdf
+
+  \example spectral/test-tss.c
+
+*/
+
+#ifndef AUBIO_TSS_H
+#define AUBIO_TSS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Transient / Steady-state Separation object */
+typedef struct _aubio_tss_t aubio_tss_t;
+
+/** create tss object
+
+  \param buf_size buffer size
+  \param hop_size step size
+
+*/
+aubio_tss_t *new_aubio_tss (uint_t buf_size, uint_t hop_size);
+
+/** delete tss object
+
+  \param o tss object as returned by new_aubio_tss()
+
+*/
+void del_aubio_tss (aubio_tss_t * o);
+
+/** split input into transient and steady states components
+
+  \param o tss object as returned by new_aubio_tss()
+  \param input input spectral frame
+  \param trans output transient components
+  \param stead output steady state components
+
+*/
+void aubio_tss_do (aubio_tss_t * o, const cvec_t * input, cvec_t * trans,
+    cvec_t * stead);
+
+/** set transient / steady state separation threshold
+
+  \param o tss object as returned by new_aubio_tss()
+  \param thrs new threshold value
+
+*/
+uint_t aubio_tss_set_threshold (aubio_tss_t * o, smpl_t thrs);
+
+/** set parameter a, defaults to 3
+
+  \param o tss object as returned by new_aubio_tss()
+  \param alpha new value for alpha parameter
+
+*/
+uint_t aubio_tss_set_alpha (aubio_tss_t * o, smpl_t alpha);
+
+/** set parameter b, defaults to 3
+
+  \param o tss object as returned by new_aubio_tss()
+  \param beta new value for beta parameter
+
+*/
+uint_t aubio_tss_set_beta (aubio_tss_t * o, smpl_t beta);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AUBIO_TSS_H */