Apparatus and method for selecting one of a first encoding algorithm and a second encoding algorithm

A method for selecting one of a first encoding algorithm comprising a first characteristic and a second encoding algorithm comprising a second characteristic for encoding a portion of an audio signal to acquire an encoded version of the portion of the audio signal, comprising:

• estimating a first quality measure for the portion of the audio signal, which is associated with the first encoding algorithm, without actually encoding and decoding the portion of the audio signal using the first encoding algorithm;
• estimating a second quality measure for the portion of the audio signal, which is associated with the second encoding algorithm, without actually encoding and decoding the portion of the audio signal using the second coding algorithm;
• and
• selecting the first encoding algorithm or the second encoding algorithm based on a comparison between the first quality measure and the second quality measure,
• wherein estimating the second quality measure comprises determining an estimated adaptive codebook distortion for each sub-portion of a plurality of sub-portions of the portion of the audio signal, and taking an innovative codebook into consideration by reducing the estimated adaptive codebook distortion determined for each sub-portion of the portion of the audio signal using a constant factor.

A non-transitory digital storage medium having a computer program stored thereon to perform, when said computer program is run by a computer, a method for selecting one of a first encoding algorithm comprising a first characteristic and a second encoding algorithm comprising a second characteristic for encoding a portion of an audio signal to acquire an encoded version of the portion of the audio signal, comprising:

• estimating a first quality measure for the portion of the audio signal, which is associated with the first encoding algorithm, without actually encoding and decoding the portion of the audio signal using the first encoding algorithm;
• estimating a second quality measure for the portion of the audio signal, which is associated with the second encoding algorithm, without actually encoding and decoding the portion of the audio signal using the second coding algorithm;
• and
• selecting the first encoding algorithm or the second encoding algorithm based on a comparison between the first quality measure and the second quality measure,
• wherein estimating the second quality measure comprises determining an estimated adaptive codebook distortion for each sub-portion of a plurality of sub-portions of the portion of the audio signal, and taking an innovative codebook into consideration by reducing the estimated adaptive codebook distortion determined for each sub-portion of the portion of the audio signal using a constant factor.