A device for adaptively encoding input digital audio signals from a plurality of channels

摘要

A novel apparatus capable of adaptively encoding input digital audio signals from a plurality of channels according to the invention comprises a quantization device 10, first and second cognitive parameter measurement devices 20 and 30, And first, second and third bit allocation units 40, 50 and 60, quantization device 70 and formatting circuit 80. In the novel second cognitive parameter measuring device 30 and the first bit allocation unit 40 of the present invention, the second cognitive parameter measuring device 30 is a signal table measured by the first cognitive parameter measuring device 20. Measure perception information amounts of each frame included in each of the input digital audio signals based on mask ratio data, sound pressure levels and masking thresholds, and N × F current and previous frames for the N total channels. Extracts average and standard deviation parameters for an inter-channel frame group corresponding to the measured amounts of cognitive information, wherein F is a positive integer and F for each of the N channels. An intra-channel frame group is generated that includes the current and previous frames. And the first bit allocation unit 40 determines a bit for each of the in-channel frame groups based on the amount of cognition information measured for each of the in-channel frame groups and the average and standard deviation parameters. Generates bit allocation information corresponding to the determined bit for each of the frame groups in the channel.