Audio signal decoding and encoding device, decoding device and encoding device

An audio signal decoding and encoding device comprising:

• a decoding device and an encoding device,
• the decoding device having:
• a stream separating circuit for separating a main signal and a control signal from an encoded stream;
• a control signal decoding circuit for decoding the control signal obtained through the separation process to output blocking information;
• a decoding and dequantizing circuit for decoding and dequantizing the main signal obtained through the separation process in accordance with the decoded control signal;
• a frequency-time converting circuit for converting the dequantized main signal of a frequency domain into a time domain signal;
• and
• an information multiplexing circuit for multiplexing the time domain signal and the blocking information, and
• the encoding device having:
• an information separating circuit for separating the time domain signal and the blocking information from a multiplex signal;
• a time-frequency converting circuit for converting the time domain signal into a frequency domain signal on the basis of the blocking information obtained through the separation process;
• a psycho-acoustic model circuit for carrying out an acoustic sense analysis for the time domain signal;
• a control signal encoding circuit for generating a control signal for quantization and encoding on the basis of a psycho-acoustic model to carry out the encoding;
• a quantizing and encoding circuit for quantizing and encoding the frequency domain signal in accordance with the control signal;
• a stream multiplexing circuit for multiplexing the encoded control signal and the encoded frequency domain signal to generate an encoded stream;
• and
• an output control circuit for controlling output timing of the encoded stream on the basis of the blocking information so that the processing delay time within the device becomes fixed.