Patent ID: 8583445
Filing Date: 2013-11-12
Classification: G10L,H04N

Abstract:
1. A method of processing a signal, comprising: receiving a downmix signal decoded by either an audio coding scheme or a speech coding scheme, the downmix signal having a bandwidth of a low frequency signal; obtaining mode information indicating whether the downmix signal is coded using the audio coding scheme or the speech coding scheme; obtaining spatial information usable to upmix the downmix signal, the spatial information including channel level difference information; generating an upmix signal from the downmix signal by using the spatial information, wherein the upmix signal includes a left channel and right channel; determining a band extension base signal corresponding to a partial frequency band of the upmix signal based on extension information; and generating a high frequency region of the downmix signal using the band extension base signal, wherein the generating the high frequency region of the downmix signal comprises time-stretching the band extension base signal in a time domain.