Codificador de audio, decodificador de audio, método para proporcionar una información de audio codificada, método para proporcionar una información de audio decodificada, programa informático y representación codificada utilizando una ampliación de ancho de banda adaptada a la señal

An audio encoder for providing an encoded audio information on the basis of an input audio information comprises a low frequency encoder configured to encode a low frequency portion of the input audio information to obtain an encoded representation of the low frequency portion, and a bandwidth extension information provider configured to provide bandwidth extension information on the basis of the input audio information. The audio encoder is configured to selectively include bandwidth extension information into the encoded audio information in a signal-adaptive manner. An audio decoder comprises a low frequency decoder configured to decode an encoded representation of a low frequency portion to obtain a decoded representation of the low frequency portion, and a bandwidth extension configured to obtain a bandwidth extension signal using a blind bandwidth extension for portions of an audio content for which no bandwidth extension parameters are included in the encoded audio information, and to obtain the bandwidth extension signal using a parameter-guided bandwidth extension for portions of the audio content for which bandwidth extension parameters are included in the encoded audio information.