Electronic musical instrument with automatic loudness compensati

Details Electronic musical instrument with automatic loudness compensati Electronic musical instrument with automatic loudness compensati

1979-03-09

1980-07-29

Truhe, J. V.

Music

Instruments

84 126, G10H 102

Patent

active

042145031

ABSTRACT:
In a musical keyboard instrument of a type having a number of tone generators substantially less than the number of keys, one of the tone generators being assigned to a key when activated, the pitch of the tone generator being set by the particular key, apparatus is provided for maintaining a constant audible loudness level to the listener from the tone generator regardless of the pitch of the tone generator. A plurality of sets of amplitude values are stored in a memory, each set including one value for each key. Each set of values corresponds to a particular loudness level. The envelope amplitude of the tone generator output is controlled to produce the same loudness level for all notes by addressing a set of values according to the selected loudness level and addressing a particular value according to which key is activated. An amplitude value is selected which is then used to control the envelope amplitude of the tone generator output signal. The amplitude value is used by the attack, decay, sustain and release amplitude generator such that the instantaneous envelope amplitude is always proportional to the selected amplitude value.

REFERENCES:
patent: 3809786 (1974-05-01), Deutsch
patent: 3908504 (1975-09-01), Deutsch
patent: 3913442 (1975-10-01), Deutsch
patent: 4079650 (1978-03-01), Deutsch et al.
patent: 4085644 (1978-04-01), Deutsch et al.

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