AUDIO ENCODING AND DECODING WITH CONDITIONAL QUANTIZERS

摘要

Some methods may involve receiving a frame of encoded audio data that includes transform coefficient data. The transform coefficient data may include exponent data and mantissa data. The mantissa data may include mantissa values that were encoded with uniform or non-uniform boundaries of quantization intervals. The mantissa values may be reconstructed based, at least in part, on exponent profile data. Based on the exponent profile data, statistics regarding the pre-quantization mantissas values may be inferred. The exponent profile data may include exponent differential data. Some such exponent differential data may be exponent difference pairs, though more than two exponent differential data points may be evaluated in alternative methods. At each frequency bin, mantissa value reconstruction may be conditioned on the exponent differential data, e.g., on the exponent difference pairs.