US 6,207,885 B1 · System and method for rendition control

Abstract

The invention presents a rendition control apparatus that not only reduces processing so that processing is neither complicated nor complex, but also reduces the used storage region. The rendition control apparatus allows for differences in the timing over the passage of time when reproducing and rendering a continuous sound waveform, and renders sound waveforms naturally and with good rhythm, while making it possible to change the reproduction tempo freely. The rendition control apparatus includes a waveform data storage means for storing waveform data rendered at a certain tempo; a reproduction tempo information production means for producing reproduction tempo information indicating a reproduction tempo; a time-axis compression/expansion processing means for compressing/expanding and reproducing the waveform data stored in said waveform data storage means in real-time on the time axis, based on reproduction tempo information produced by said reproduction tempo information production means; a control signal production means for producing a control signal for modulating periodically with the passage of time the reproduction with the time-axis compression/expansion processing means, based on the reproduction tempo information. Reproduction tempo information produced by said reproduction tempo information production means are entered into said control signal production means, and said control signal production means produces, as the control signal, a periodical signal whose period corresponds to the entered reproduction tempo information.

Claims23

Dependent claims

A system for rendition control, the system comprising:

a waveform storage means for storing a continuous sound waveform;
a compression and expansion means for generating a reproduction waveform by compressing or expanding the sound waveform while following a temporally changing control signal indicating a level of compression or expansion;
and
a periodic signal generation means for generating a periodic signal whose waveform shape changes with the passage of time;
wherein the periodic signal is communicated to the compression and expansion means as the control signal;
and
wherein the periodic signal generation means comprises:
a periodic waveform storage means for storing a plurality of periodic waveforms;
a periodic waveform read-out means for temporally switching, in accordance with certain sequence information, between the plurality of periodic waveforms so as to generate a periodic signal whose waveform shape changes with the passage of time;
and
a sequence information storage means for storing sequence information specifying an order with which the periodic waveforms are read out by the periodic waveform read-out means.

8 more elements

A system for rendition control, the system comprising:

memory for storing waveform data rendered at a certain tempo;
and
a processor programmed for
producing reproduction tempo information indicating a reproduction tempo,
producing depth information indicating a modulation depth, producing a periodic control signal with a period that corresponds to the reproduction tempo information and an amplitude that corresponds to the modulation depth for modulating the waveform data, and
compressing or expanding and reproducing the waveform data in real-time based on the reproduction tempo information and the control signal.

3 more elements

A method for rendition control, the method comprising the steps of:

storing waveform data rendered at a certain tempo;
producing reproduction tempo information indicating a reproduction tempo;
producing depth information indicating a modulation depth;
producing a periodic control signal with a period that corresponds to the reproduction tempo information and an amplitude that corresponds to the modulation depth for modulating the waveform data;
and
compressing or expanding and reproducing the waveform data in real-time based on the reproduction tempo information and the control signal.

3 more elements

Dependencies are inferred from the claim text.

System and method for rendition control

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System and method for rendition control

Life of this patent

Abstract

Claims23