Apparatus for controlling reproduction on pitch variation of an input waveform signal
US5001960A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Jun 7, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2210/201
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An input waveform signal representing, for example, a string oscillation is input to a pitch extraction circuit. The pitch extraction circuit extracts a pitch frequency from the input waveform signal, and this pitch frequency is input to a RAM connected to a CPU. On the other hand, LFO data from an LFO is input to a RAM. The CPU detects the amount of variation of the pitch frequency based on the pitch frequency and coverts the amount of variation of the pitch frequency in accordance with a predetermined conversion function. Thereafter the converted value is added to the LFO data to form musical sound control data for imparting a tremolo effect or a vibrato effect. The musical sound production circuit thereby imparts the above effect to the musical sound to be produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.