Are spectral coefficients and scalefactor bands same? I'm confused with the scalefactor bands.
Which ones are acutally huffman coded into bitstream?
Quote from: dduarr on 31 March, 2015, 03:08:47 AMAre spectral coefficients and scalefactor bands same? I'm confused with the scalefactor bands.With AAC you have a block of 1024 audio samples, which are transformed to frequency domain; hence you obtain 1024 frequency components (let's forget about overlapping and short blocks for now). These frequency components are then grouped into 49 bands, approximately corresponding to the human auditory system's critical bands. Each of these bands is then assigned its own scale factor. So, every scale factor band contains multiple frequency components (coefficients), but all components within a band are quantized with the same scale factor.QuoteWhich ones are acutally huffman coded into bitstream?The quantized spectral coefficients are being Huffman-coded and packed into a frame, along with the scale factors.