Apparatus for combining stored waveforms to synthesize musical tones
AssigneeYamaha Corporation
InventorsAkira IIzuka, Kenji Kawakami
Life of this patent
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Abstract
A musical tone synthesizing apparatus comprising FM operators and connection control device. At least one of the FM operators comprises a waveform memory, phase data generation device, and output inversion device. The waveform memory stores fundamental waveform data. The phase data generation device generates phase data as an address signal for accessing the waveform memory on the basis of a musical tone designation signal and a modulation signal inputted from an external circuit. The output inversion device selects whether a waveform signal read out from the waveform memory is outputted after sign inversion, or is outputted directly. The connection control device arbitrarily combine connections of the FM operators.
Claims18
A musical tone synthesizing apparatus comprising:
- circuitry means for generating a musical tone designation signal and an initial modulation signal;
- a plurality of frequency modulation operators each including a waveform memory means for storing fundamental waveform data, and phase data generation means for generating a phase data address signal for accessing said waveform memory means on the basis of said musical tone designation signal and said modulation signal inputted from said circuitry means, said frequency modulation operators thereby producing an output waveform signal;
- at least one of said plurality of frequency modulation operators further includes output inversion means for selecting whether said output waveform signal read out from said waveform memory in accordance with said phase data is outputted after sign inversion or is outputted directly;
- and
- connection control means for arbitrarily combining input and output connections of said plurality of frequency modulation operators, whereby at least one of said output waveform signals outputted from said output inversion means is inputted to at least one of said plurality of frequency modulation operators as at least one component of the modulation signal.
A musical tone synthesizing apparatus comrpising:
- first memory means for storing waveform data;
- first phase generating means for generating first phase data as a first address signal for accessing said first memory means;
- first modulation means for receiving and modulating said first address signal based on a modulation signal inputted thereto;
- first reading-out means for reading-out said waveform data from said first memory means according to said modulation first address signal, so that a first musical tone signal is generated;
- first inverting means for arbitrarily inverting said first musical tone signal;
- second memory for storing waveform data;
- second phase generating means for generating second phase data as a second address signal for accessing said second memory means;
- second reading-out means for reading-out said waveform data from said second memory means according to said second address signal, so that a second musical tone signal is generated;
- and
- adding means for adding said first musical tone signal inverted by said first inverting means and said second musical tone signal from said second reading out means to produce an output musical tone signal.
A musical tone synthesizing apparatus comprising:
- first memory means for storing waveform data;
- first phase generating means for generating first phase data as a first address signal for accessing said first memory means;
- first modulation means for receiving and modulating said first address signal based on a modulation signal inputted thereto;
- first reading-out means for reading-out said waveform data from said first memory means according to said modulation first address signal, so that a first musical tone signal is generated;
- first inverting means for arbitrarily inverting said first musical tone signal;
- and
- first feeding back means for feeding said arbitrarily inverted first musical tone signal from said first inverting means back to said first modulating means as said modulation signal.
Dependencies are inferred from the claim text.