Proposed is a new technique of effective regeneration of high-frequency 
tonal components in an augmented MPEG-4 AAC HE decoder. The basic idea 
is to synthesize the tonal components using the technique called synthetic 
sinusoidal coding that is already adopted in the MPEG-4 codecs in another 
context. Here, the idea is to mix this technique with standard Spectral 
Band Replication (SBR), i.e. to add some control information to a standard 
MPEG-4 AAC HE bit-stream that is used to synthesize the high-frequency 
tonal components in a decoder. In that way, provided is proper synthesis 
of rapidly changing sinusoids as well as proper harmonic structure in 
the high-frequency band. The experiments show that the tool improves 
significantly the compression performance when added to an MPEG-4 AAC HE codec. 
This improvement has been confirmed by listening tests.