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AssigneeUberchord Engineering GmbH
InventorMartin Polak
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This is a method and installation in which a time-domain digital audio signal is split into a plurality of narrow-band time-domain digital audio signals confined to specific frequency bands, short-term segments of which are temporarily stored in memory. The method comprises the use of signal processing algorithms for extracting multiple signal features from said short-term segments in a fixed sequence or upon request from a decision-making algorithm. Said decision-making algorithm makes tentative or final decisions about the type of occupancy of frequency bands resulting from the extracted features. Said decision-making algorithm may request from said signal processing algorithms further specific feature extractions from specific short-term segments and make further tentative or final decisions about the type of occupancy of frequency bands resulting from the requested features. Next, said decision-making algorithm stores its tentative decisions and makes final decisions about band occupancy for processing together with results from later short-term segments. Eventually, said decision-making algorithm outputs final decisions derived from current and past short-segments in the form of a set of notes having been played over some recent time interval, together with information as to the timing of each note from the set.
A method for processing an original time-domain digital audio signal wherein said signal is split into a plurality of narrow-band time-domain digital audio signals confined to specific frequency bands, short-term segments of which are temporarily stored in memory, the method comprising:
An apparatus for processing a sequence of signals wherein an original time-domain digital audio signal is split into a plurality of narrow-band time-domain digital audio signals confined to specific frequency bands, short-term segments of which are temporarily stored, with physical elements including at least a processor and a memory allowing use of signal processing algorithms for extracting from said short-term segments narrow-band time-domain features such as average power, and/or average amplitude, and/or instantaneous frequency or characteristics derived therefrom, and/or instantaneous period or characteristics derived therefrom, and/or instantaneous envelope or characteristics derived therefrom, and/or the time-domain positions of zero-crossings derived from sample values, directly or by interpolation, or characteristics derived therefrom, said extraction of said features taking place in a fixed sequence or upon request from a decision-making algorithm, then having said decision-making algorithm make tentative or final decisions about the type of occupancy of frequency bands resulting from said narrow-band time-domain features, then having said decision-making algorithm request from said signal processing algorithms further specific narrow-band time-domain features from specific short-term segments and make tentative or final decisions about the type of occupancy of frequency bands resulting from said requested features, said decision-making algorithm storing its tentative and final decisions about band occupancy in said memory for processing together with results from later short-term segments, and said processor further having said decision-making algorithm output final decisions derived from current and past short-segments in the form of a set of notes having been played over some recent time interval, together with information as to the timing of each note from the set.
Dependencies are inferred from the claim text.