Apparatus and method for generating a frequency enhanced signal using temporal smoothing of subbands

Method of processing audio signals, comprising:

• generating an encoded core signal;
• and
• generating a frequency enhancement signal using a method of generating a frequency enhancement signal, comprising:
• generating an enhancement signal from a core signal, the enhancement signal comprising an enhancement frequency range not included in the core signal, wherein a current time portion of the enhancement signal or the core signal comprises subband signals for a plurality of subbands;
• calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core signal, and
• wherein the generating comprises smoothing the plurality of subband signals of the enhancement frequency range or the core signal using the same smoothing information.

A non-transitory digital storage medium having a computer program stored thereon to perform the method of generating a frequency enhancement signal, the method comprising:

• generating an enhancement signal from a core signal, the enhancement signal comprising an enhancement frequency range not included in the core signal, wherein a current time portion of the enhancement signal or the core signal comprises subband signals for a plurality of subbands;
• calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core signal, and
• wherein the generating comprises smoothing the plurality of subband signals of the enhancement frequency range or the core signal using the same smoothing information,
• when said computer program is run by a computer.

A non-transitory digital storage medium having a computer program stored thereon to perform the method of processing audio signals, the method comprising:

• generating an encoded core signal;
• and
• generating a frequency enhancement signal using a method of generating a frequency enhancement signal, comprising:
• generating an enhancement signal from a core signal, the enhancement signal comprising an enhancement frequency range not included in the core signal, wherein a current time portion of the enhancement signal or the core signal comprises subband signals for a plurality of subbands;
• calculating the same smoothing information for the plurality of subband signals of the enhancement frequency range or the core signal, and
• wherein the generating comprises smoothing the plurality of subband signals of the enhancement frequency range or the core signal using the same smoothing information,
• when said computer program is run by a computer.