Signal encoder and decoder apparatus suitable for encoding an input signal and decoding an encoded signal, recording medium where encoded signals are recorded, and signal encoding and decoding process for encoding an input signal and decoding an encoded signal.

摘要

Invention Patent "APPROPRIATE SIGNAL ENCODER AND SIGNAL DECODER FOR ENCODING AN ENTRY SIGNAL AND DECODING AN ENCODED SIGNAL, RECORDING SUPPORT WHERE ENCODED SIGNALS ARE RECORDED, AND ENCODING PROCESSING AND ENCODING A SIGNALING ENCODING FOR SIGNALING. CODED SIGNAL ". A signal encoding apparatus for encoding an acoustic signal. This signal encoding apparatus includes a transformation circuit for transforming an input acoustic signal into frequency components, a signal component separator circuit for separating an output from the transformation circuit into characteristic tone components and characteristic noise components, a circuit tone characteristic encoder to encode a tone characteristic component signal, and a noise characteristic component encoder circuit to decode a noise characteristic component signal, in which the noise characteristic component encode circuit encodes the respective signal components of the signal of characteristic tone components so that they have respectively different lengths of code to thereby improve the coding efficiency without degrading the sound quality with respect to the tone acoustic signal stica.