Player for digitally recorded music
US4351213A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1979 |
| Grant date | Sep 28, 1982 |
| Priority date | — |
| Expiry date | Aug 20, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S84/10
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An apparatus (10) for transforming digital data stored in a memory (18) into sounds is disclosed. The apparatus includes an oscillator (12) which drives an address selector (14). The address selector drives the memory. A note generator (20) generates an analog electrical signal responsive to the memory, and a speaker with its associated amplifier stages (22) produces sounds corresponding to the analog electrical signal. A preferred arrangement of the note generator includes an inverting amplifier which can simply be a logic gate (44) and a plurality of resistors (50) selected by switches (56) in feedback relationship with the amplifier. A preferred arrangement includes a duty cycle selector (80) to produce harmonics of the fundamental frequency of the analog electrical signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.