Patent10.1121/1.395874
Tone signal processing device
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TL;DR: In this paper, a digital filter is provided between a tone signal generation circuit and a sampling circuit which resamples this digital tone signal in accordance with a second sampling frequency which is lower than the first sampling frequency.
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Abstract: A digital filter is provided between a tone signal generation circuit which supplies a digital tone signal in accordance with a first sampling frequency and a sampling circuit which resamples this digital tone signal in accordance with a second sampling frequency which is lower than the first sampling frequency. This digital filter filters the input digital tone signal with such amplitude-frequency characteristics as to be able to substantially remove an aliasing noise produced due to the second sampling frequency (e.g., with low-pass filter characteristics having a cut-off frequency which is 1/2 the second sampling frequency). This removes high frequency components producing an aliasing noise from the digital tone signal before it is applied to the resampling circuit whereby generation of the aliasing noise in resampling is prevented. The resampling is performed for adapting the digital tone signal to an operation clock frequency of an effect imparting circuit provided in a posterior stage for imparting, in digital, a tone effect such as a modulation effect to the digital tone signal.
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Citations
Patent
Multichannel decimation/interpolation filter
Douglas W. Morton
- 05 Jan 1988
TL;DR: In this article, a multichannel, digital filter capable of operation in either decimation or interpolation mode is presented, where the filter includes means for receiving and storing data representing the number of channels M and N for each channel, and mode data re-presenting decimation and interpolation modes.
84
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Kun Lin,Jonathan Mayer,James Martin Nohrden +2 more
- 26 Sep 1997
TL;DR: In this article, a dynamic volume control system in an audio processor uses gain and delay signals from a digital signal processor to dynamically control the user-selected volume of the audio processor.
74
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Semiconductor emulation of tube amplifiers
Eric K. Pritchard
- 23 Mar 1988
TL;DR: In this article, a semiconductor system analog or digital processor (402) for emulating a vacuum tube amplifier having first distortion (372), tone control (373), and second distortion (374) circuits is presented.
64
Patent
Software sound synthesis system
Steven S. O'Connell
- 22 Nov 1995
TL;DR: In this article, an audio signal processing system including an input circuit for inputting musical instrument digital interface (MIDI) commands in real time over a plurality of channels, a computer including a central processing unit (CPU) supplied with the MIDI commands, and an output circuit for audibly reproducing the voices from the digital voice data stored in the RAM, was presented.
53
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A reduced-memory reverberation simulator in a sound synthesizer
Michael V. Jenkins,Dong Quijie,Edward M. Veeser +2 more
- 10 Sep 1997
TL;DR: In this paper, the authors proposed a reverberation simulator with a substantially reduced volatile storage, random access memory, or buffer size in comparison to conventional reverberation simulators by decimating the sound signal prior to applying the sound signals to a reverberator and then interpolating the generated sound signal generated by the reverberator to restore the sample frequency.
35
References
Patent
Interpolation-decimation circuit for increasing or decreasing digital sampling frequency
Ronald Eldon Crochiere,Lawrence R. Rabiner +1 more
- 24 Sep 1975
TL;DR: In this article, a general purpose interpolator-decimator circuit for increasing or decreasing the sampling rate of a digital signal by a factor L/M, where L and M are integers, is disclosed.
121
Patent
Electronic musical instrument equipped with a reverberation tone generating apparatus
Mitsumi Kato,Futamase Tsuyoshi +1 more
- 05 May 1983
TL;DR: In this paper, the most suitable reverberation one for the selected tone colour is attached to a musical tone with a selected tone color in an electronic musical instrument equipped with a multiplicity of keyboards and reverberation tones are independently attached to musical tones which are generated in accordance with the keyboards.
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