Spectral band replication transmits only lows and predicts highs from them

Evidence

With SBR, the higher frequencies are not transmitted, and the bits are instead allocated to convey the lower frequencies more accurately, from which the higher frequencies are predicted (see Figure 15.15). Side information at a low bit rate is transmitted to adjust the spectral envelope of the higher frequencies to match better that of the original higher frequencies. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 2162

Categorization

Category: Causal Relationships

• DEFINE: Explains the bit-saving mechanism behind spectral band replication used in low-bitrate codecs.