Player for digitally recorded music

Details Player for digitally recorded music Player for digitally recorded music

1979-08-20

1982-09-28

Witkowski, Stanley J.

Music

Instruments

84DIG10, G10H 510

Patent

active

043512135

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.

REFERENCES:
patent: 3821714 (1974-06-01), Tomisawa et al.
patent: 3977291 (1976-08-01), Southard
patent: 4014238 (1977-03-01), Southard
patent: 4079334 (1978-03-01), Hamilton
patent: 4119005 (1978-10-01), Kondo et al.

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