| 摘要 |
<p>A signal processing apparatus wherein a changed signal, such as a degraded signal or the like, can be restored with realizability achieved without increasing the apparatus scale. The signal processing apparatus (1) has a processing part (4) that restores a source signal data, which is, for example, a signal before being changed, from an original signal data in which the change, such as degradation, has occurred (and which will be referred to as "changed data" hereinafter). There are provided a changed data area in which the changed data is stored and a restored data area in which the signal data as restored is stored each time the restoring process is done. The processing part performs a repetitive processing for obtaining the source signal. When the energy value of the residual data is less than zero during the repetitive processing, some of the energy having already moved to the restored data area is placed, by use of change factor information, back to the changed data area such that the energy value of the residual data becomes equal to or greater than zero. In this way, the repetitive processing is performed such that the data formed in the restored data area after completion of the repetitive processing will be used as the source signal data.</p> |
