Electronic sound signal generator achieving scratch sound effect using scratch readout from waveform memory
US5512704A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1993 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Oct 12, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2210/241
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
While a sound waveform is reproductively read out from a waveform memory in accordance with a readout rate designated in correspondence to a desired pitch, scratch control data for controlling readout rate and readout direction are generated using a manual controller or an envelope function generator. In accordance with the scratch control data, the readout rate is changed. The thus-changed readout rate is of a positive or negative value depending on a factor that controls the readout direction. Readout from the waveform memory of the waveform data is controlled on the basis of the changed readout rate so that, when the changed rate is of a positive value, the waveform data are read out from the memory in the forward direction at a readout speed corresponding to the rate value, and when the changed rate is of a negative value, the waveform data are read out from the memory in the reverse direction. Further, when the changed rate is zero, the waveform data readout is stopped. Thus, in accordance with time-variable conditions of the scratch data, it is possible to perform a variety of waveform readout controls, such as discontinuing readout, accelerating and slowing down readout in t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.