Piano tone-synthesizing system for electronic musical instruments

Claim 3

A system according to claim 1 comprising combining the respective musical tone signals in a ratio of substantially 1: 1:0.2:0.16:0.14.

Claim 4

A system according to claim 1 comprising deriving said 4'', 8'' and 16'' tone signals from said tone generators with respective percussive envelopes.

Claim 5

A piano tone synthesizing system for electronic musical instruments comprising: keyboard means having a plurality of keys for initiating tone generation; a plurality of tone generators; keyer means for coupling out tone tone signals of 4'', 8'' and 16'' from said tone generators in response to operation of each key of said keyboard means; a first tone coloring filter means coupled to said keyer means for supplying said 4'' tone signal with the color of flute tones; a second tone Coloring filter means coupled to said keyer means for supplying said 8'' tone signal with the color of flute tones; a third tone coloring filter means coupled to said keyer means for suppying the color of flute tones to said 16; tone signal; a fourth tone coloring filter means coupled to said keyer means for supplying the 4'' and 8'' tone signals with the color of brass tones; a fifth tone coloring filter means coupled to said keyer means for supplying said 4'' and 8'' tone signals with the color of string tones; and means for combining output signals from said first to fifth tone coloring filters to generate a synthesized tone signal.

Claim 6

A piano tone synthesizing system for electronic musical instruments comprising: keyboard means having a plurality of keys for initiating tone generation; a plurality of tone generators; keyer means for coupling out tone tone signals of 4'', 8'' and 16'' from said tone generators in response to operation of each key of said keyboard means; a first tone coloring filter means coupled to said keyer means for supplying said 4'' tone signal with the color of flute tones; a second tone Coloring filter means coupled to said keyer means for supplying said 8'' tone signal with the color of flute tones; a third tone coloring filter means coupled to said keyer means for suppying the color of flute tones to said 16; tone signal; a fourth tone coloring filter means coupled to said keyer means for supplying the 4'' and 8'' tone signals with the color of brass tones; a fifth tone coloring filter means coupled to said keyer means for supplying said 4'' and 8'' tone signals with the color of string tones; and means for combining output signals from said first to fifth tone coloring filters to generate a synthesized tone signal.

Claim 7

A system according to claim 4 further comprising amplitude varying means coupled to said first tone coloring filter means for progressively reducing the amplitudes of a plurality of 4'' tone signals delivered from said keyer means in response to operation of a plurality of keys on said keyboard means as their frequencies decrease.

Claim 8

A system according to claim 5 wherein said amplitude varying means comprises a high pass filter.

Claim 9

A system according to claim 5 wherein said amplitude varying means comprises a mixer coupled between said keyer and said first tone coloring filter.

Claim 10

A system according to claim 7 wherein said mixer includes a plurality of input terminals; one output terminal coupled to the input of said first tone coloring filter; a plurality of first resistors of equal resistance connected at one end to the plural input terminals respectively; and a plurality of second serially connected resistors of equal resistance successively interconnecting the opposite ends of said first resistors with at least one second resistor coupled between successive opposite ends of said first resistors, one end of said serial connection of said second resistors being connected to said output terminal, and said input terminals being supplied with the 4'' tone signals whose frequencies progressively decrease from the input terminal coupled to the first resistor which is connected at its said other end to the output end of said serial connection of said second resistors toward the input terminals successively coupled at points along said serial connection of said second resistors.

Claim 11

A system according to claim 8 wherein said input terminals of said mixer are each supplied with a plurality of 4'' tone signals falling within a predetermined compass collectively.

Claim 12

A system according to claim 4 further comprising amplitude varying means coupled to said third tone coloring filter means for progressively reducing the amplitudes of a plurality of 16'' tone signals delivered from said keyer means in response to operation of a plurality of keys on said keyboard means as their frequencies increase.

Claim 13

A system according to claim 10 wherein said amplitude varying means is a low pass filter.

Claim 14

A system according to claim 10 wherein said amplitude varying means is a mixer connected between said keyer means and said third tone coloring filter.

Claim 15

A system according to claim 12 wherein said mixer includes a plurality of input terminals, one output terminal coupled to the input of said third tone coloring filter means, a plurality of first resistors of equal resistance connected at one end of said plural input terminals respectively; and a plurality of second serially connected resistors of equal resistance successively interconnecting the opposite ends of said first resistors with at least one second resistor coupled between successive opposite ends of said first resistors, one end of said serial connection of said second resistors being connected to said output terminal, and said input terminals being supplied with 16'' tone signals whose frequencies progressively increase from the input terminal coupled to the first resistor which is connected at its said other end to the output end of said serial connection of said second resistors toward the input terMinals successively coupled at points along said serial connection of said second resistors.

Claim 16

A system according to claim 10 wherein said input terminals of said mixer are each supplied with a plurality of 16'' tone signals falling within a predetermined compass collectively.

Claim 17

A system according to claim 4 further including amplitude varying means coupled to said fifth tone coloring filter means for progressively reducing the amplitudes of a plurality of 4'' tone signals and those of a plurality of 8'' tone signals delivered from said keyer in response to operation of a plurality of keys on said keyboard means as their frequencies increase.

Claim 18

A system according to claim 4 further comprising a first amplitude varying means connected between said keyer means and said fourth tone coloring filter means and a second amplitude varying means connected between said keyer means and said fifth tone coloring filter means; said first and second amplitude varying means each having a plurality of input terminals, a first and a second output terminal, a plurality of first resistors successively connected at one end to the plural input terminals respectively, and a plurality of second serially connected resistors of equal resistivity successively interconnecting the opposite ends of said plural first resistors with at least one second resistor coupled between successive opposite ends of said first resistors; said first and second output terminals being connected to the end terminals of the serial circuit comprised of said serially connected second resistors; said plural input terminals of each of said first and second amplitude varying means being so connected to said keyer means as to receive a group of 4'' tone signals and that of 8'' tone signals respectively whose frequencies progressively decrease from the input terminal which is coupled to the first resistor which is connected at its said other end to said first output terminal toward the input terminal which is coupled to the first resistor which is connected at its said other end to said second output terminal; said first and second output terminals of said first and second amplitude varying means being connected to said fourth tone coloring filter; and said second output terminal of each of said first and second amplitude varying means being connected to said fifth tone coloring filter.

Claim 19

A piano tone-synthesizing system for electronic musical instruments comprising: keyboard means having a plurality of keys for initiating tone generation; a plurality of tone generators; keyer means for coupling out tone signals of 4'', 8'' and 16'' from said tone generators in response to operation of at least one key of said keyboard means; means coupled to the output of said keyer means for forming a first musical tone signal, said means including a tone coloring filter means for supplying the 4'' tone signals with the color of flute tone and means coupled to said tone coloring filter means for varying the levels of the 4'' tone signals as a function of their frequencies over a given range of frequencies; means coupled to the output of said keyer means for forming a second musical tone signal, said means including a tone coloring filter means for supplying the 8'' tone signals with the color of flute tones; means coupled to the output of said keyer means for forming a third musical tone signal, said means incluidng a tone coloring filter means for imparting the color of flute tones to the 16'' tone signals and means coupled to said tone coloring filter for varying the levels of the 16'' tone signals as a function of their frequencies over a given range of frequencies; means coupled to the output of said keyer means for forming a fourth musical tone signal, said means including a tone coloring filter means for supplying the 4'' and 8'' tone signals with the color of brass tones; means coupled to the output of said Keyer means for forming a fifth musical tone signal, said means including a tone coloring filter means for supplying the 4'' and 8'' tone signals with the color of string tones and means coupled to said tone coloring filter means for varying the levels of the 4'' 8'' tone signals as a function of their frequencies over a given range of frequencies; and means for combining said first to fifth musical tone signals in a predetermined ratio to generate a synthesized tone signal.

Claim 20

A piano tone-synthesizing system for electronic musical instruments comprising: keyboard means having a plurality of keys for initiating tone generation; a plurality of tone generators; keyer means for coupling out tone signals of 4'', 8'' and 16'' from said tone generators in response to operation of at least one key of said keyboard means; means coupled to the output of said keyer means for forming a first musical tone signal, said means including a tone coloring filter means for supplying the 4'' tone signals with the color of flute tone and means coupled to said tone coloring filter means for varying the levels of the 4'' tone signals as a function of their frequencies over a given range of frequencies; means coupled to the output of said keyer means for forming a second musical tone signal, said means including a tone coloring filter means for supplying the 8'' tone signals with the color of flute tones; means coupled to the output of said keyer means for forming a third musical tone signal, said means incluidng a tone coloring filter means for imparting the color of flute tones to the 16'' tone signals and means coupled to said tone coloring filter for varying the levels of the 16'' tone signals as a function of their frequencies over a given range of frequencies; means coupled to the output of said keyer means for forming a fourth musical tone signal, said means including a tone coloring filter means for supplying the 4'' and 8'' tone signals with the color of brass tones; means coupled to the output of said Keyer means for forming a fifth musical tone signal, said means including a tone coloring filter means for supplying the 4'' and 8'' tone signals with the color of string tones and means coupled to said tone coloring filter means for varying the levels of the 4'' 8'' tone signals as a function of their frequencies over a given range of frequencies; and means for combining said first to fifth musical tone signals in a predetermined ratio to generate a synthesized tone signal.

Claim 21

A system according to claim 17 wherein said predetermined ratio in which the respective musical tone signals are combined in substantially 1:1:0.2:0.16:0.14.