Method and device for audio crossfades using decomposed signals

A device for processing audio signals, comprising:

• a first input unit providing a first input signal of a first input audio track and a second input unit providing a second input signal of a second input audio track;
• a decomposition unit configured to decompose the first input audio signal to obtain a plurality of decomposed signals, comprising at least a first decomposed signal and a second decomposed signal different from the first decomposed signal;
• a playback unit configured to start playback of a first output signal obtained from recombining at least the first decomposed signal at a first volume level with the second decomposed signal at a second volume level, such that the first output signal substantially equals the first input signal;
• a transition unit for performing a transition between playback of the first output signal and playback of a second output signal obtained from the second input signal, wherein the transition unit has a volume control section adapted for reducing the first volume level according to a first transition function and reducing the second volume level according to a second transition function different from said first transition function;
• wherein each of the first and second transition functions assigns a predetermined volume level or a predetermined change in volume level to each of a plurality of controller positions within a controller range of a user operated controller defined between a controller first end position and a controller second end position;
• and
• wherein the transition unit is configured to start playback of a second output signal obtained from the second input signal after starting playback of the first output signal but before volume levels of all decomposed signals of the first input signal have reached substantially zero.

A method for processing audio signals, comprising:

• providing a first input signal of a first input audio track and a second input signal of a second input audio track;
• decomposing the first input signal to obtain a plurality of decomposed signals, comprising at least a first decomposed signal and a second decomposed signal different from the first decomposed signal;
• assigning a first volume level to the first decomposed signal and a second volume level to the second decomposed signal;
• starting playback of a first output signal obtained from recombining at least the first decomposed signal at the first volume level with the second decomposed signal at the second volume level, such that the first output signal substantially equals the first input signal;
• while playing the first output signal, reducing the first volume level according to a first transition function and reducing the second volume level according to a second transition function different from said first transition function, wherein each of the transition functions assigns a predetermined volume level or a predetermined change in volume level to each of a plurality of controller positions within a controller range of a user operated controller defined between a controller first end position and a controller second end position;
• starting playback of a second output signal obtained from the second input signal after starting playback of the first output signal but before volume levels of all decomposed signals of the first input signal have reached substantially zero;
• and
• wherein the first transition function and the second transition function differ from each other with regard to slope.

A method for processing audio signals, comprising:

• providing a first input signal of a first input audio track and a second input signal of a second input audio track;
• decomposing the first input signal to obtain a plurality of decomposed signals, comprising at least a first decomposed signal and a second decomposed signal different from the first decomposed signal;
• assigning a first volume level to the first decomposed signal and a second volume level to the second decomposed signal;
• starting playback of a first output signal obtained from recombining at least the first decomposed signal at the first volume level with the second decomposed signal at the second volume level, such that the first output signal substantially equals the first input signal;
• while playing the first output signal, reducing the first volume level according to a first transition function and reducing the second volume level according to a second transition function different from said first transition function, wherein each of the transition functions assigns a predetermined volume level or a predetermined change in volume level to each of a plurality of controller positions within a controller range of a user operated controller defined between a controller first end position and a controller second end position;
• starting playback of a second output signal obtained from the second input signal after starting playback of the first output signal but before volume levels of all decomposed signals of the first input signal have reached substantially zero;
• and
• analyzing an audio signal comprising at least one of the decomposed signals to determine a song part junction between two song parts within the first input audio track or within the second input audio track, wherein a transition time interval of at least one of the transition functions is set such as to include the song part junction.

A method for processing audio signals, comprising:

• providing a first input signal of a first input audio track and a second input signal of a second input audio track;
• decomposing the first input signal to obtain a plurality of decomposed signals, comprising at least a first decomposed signal and a second decomposed signal different from the first decomposed signal;
• assigning a first volume level to the first decomposed signal and a second volume level to the second decomposed signal;
• starting playback of a first output signal obtained from recombining at least the first decomposed signal at the first volume level with the second decomposed signal at the second volume level, such that the first output signal substantially equals the first input signal;
• while playing the first output signal, reducing the first volume level according to a first transition function and reducing the second volume level according to a second transition function different from said first transition function, wherein each of the transition functions assigns a predetermined volume level or a predetermined change in volume level to each of a plurality of controller positions within a controller range of a user operated controller defined between a controller first end position and a controller second end position;
• starting playback of a second output signal obtained from the second input signal after starting playback of the first output signal but before volume levels of all decomposed signals of the first input signal have reached substantially zero;
• receiving a user input referring to a transition command, including at least one transition parameter;
• and
• setting at least one of the transition functions according to the transition parameter.

A device for processing audio signals, comprising:

• a first input unit providing a first input signal of a first input audio track and a second input unit providing a second input signal of a second input audio track;
• a decomposition unit configured to decompose the first input audio signal to obtain a plurality of decomposed signals, comprising at least a first decomposed signal and a second decomposed signal different from the first decomposed signal;
• a playback unit configured to start playback of a first output signal obtained from recombining at least the first decomposed signal at a first volume level with the second decomposed signal at a second volume level, such that the first output signal substantially equals the first input signal;
• a transition unit for performing a transition between playback of the first output signal and playback of a second output signal obtained from the second input signal, wherein the transition unit has a volume control section adapted for reducing the first volume level according to a first transition function and reducing the second volume level according to a second transition function different from said first transition function;
• an analyzing unit configured to analyze an audio signal to determine a song part junction between two song parts within the first input audio track or within the second input audio track, wherein a transition time interval of at least one of the transition functions is set such as to include the song part junction;
• a user interface configured to accept a user input referring to a transition command, including at least one transition parameter, wherein the transition unit is configured to set at least one of the transition functions according to the transition parameter;
• and
• wherein the transition parameter is preferably selected from one or more of:
• a transition start time (T1) of a transition time interval of at least one of the transition functions,
• a transition end time (T3) of a transition time interval of at least one of the transition functions,
• a length of a transition time interval of at least one of the transition functions,
• a transition reference time (T2) within the transition time interval of at least one of the transition functions,
• a slope, shape or offset of at least one of the transition functions, or
• an assignment or deassignment of a preset transition function to or from a selected one of the plurality of decomposed tracks.

A device for processing audio signals, comprising:

• a first input unit providing a first input signal of a first input audio track and a second input unit providing a second input signal of a second input audio track;
• a decomposition unit configured to decompose the first input audio signal to obtain a plurality of decomposed signals, comprising at least a first decomposed signal and a second decomposed signal different from the first decomposed signal;
• a playback unit configured to start playback of a first output signal obtained from recombining at least the first decomposed signal at a first volume level with the second decomposed signal at a second volume level, such that the first output signal substantially equals the first input signal;
• a transition unit for performing a transition between playback of the first output signal and playback of a second output signal obtained from the second input signal, wherein the transition unit has a volume control section adapted for reducing the first volume level according to a first transition function and reducing the second volume level according to a second transition function different from said first transition function;
• an analyzing unit configured to analyze an audio signal to determine a song part junction between two song parts within the first input audio track or within the second input audio track, wherein a transition time interval of at least one of the transition functions is set such as to include the song part junction;
• and
• wherein the device includes a display unit configured to display a graphical representation of at least one of the decomposed signals, wherein a user interface is configured to allow a user to assign or deassign a preset transition function to or from a selected one of the plurality of decomposed tracks.