Normalization for multi-stage quantization in audio coding using gain-shape residuals

A method for decoding audio data, the method comprising:

• obtaining an encoded audio bitstream representative of the audio data that includes normalized residual data as 14 bits using a fixed-point signed representation;
• and
• performing inverse multi-stage vector quantization with respect to the normalized residual data to obtain one or more subbands representative of the audio data;
• reconstructing, based on the one or more subbands, the audio data;
• rendering, based on the audio data, one or more speaker feeds;
• and
• outputting, for playback, the one or more speaker feeds.

A device configured to encode audio data, the device comprising:

• a memory configured to store the audio data;
• and
• processing circuitry in communication with the memory, the processing circuitry configured to:
• perform multi-stage vector quantization with respect to one or more subbands of the audio data to obtain quantized audio data, wherein after each stage of the multi-stage vector quantization, the processing circuitry is further configured to normalize an error associated with residual data corresponding to the quantized audio data;
• generate, based on the quantized audio data, an encoded audio bitstream representative of the audio data;
• and
• output, to an audio decoding device, the encoded audio bitstream.