Tube Amplifier Emulator
OwnerShengchao Alfred Liinventor
Life of this patent
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Abstract
This disclosure shows methods and apparatus to emulate vacuum tube amplifiers that have output transformers, to deliver “tube sound”, where the output transformer nonlinearity is emulated. Prior arts that emulated vacuum tube amplifiers either did not include output transformer nonlinearity in their emulation, or did not do it correctly. The disclosed methods and apparatus have the advantage of low cost and flexibility, because the output transformers are included in the emulation.
Claims20
A speaker driving circuit without output transformer for nonlinearly modifying bass frequency components of input signal according to the amplitudes of those bass frequency components included in said input signal, while leaving higher frequency components included in said input signal approximately unaffected by said nonlinear modifying, comprising:
- a type 2 compressor,
- a type 3 expander,
- a voltage driver,
- a second proportional adder/subtracter,
- an optional first proportional adder/subtracter,
- an optional type 1 Rp/Power supply emulator,
- where the first input port of said type 2 compressor receives said input signal, the first output terminal and the second output terminal of said voltage driver coupled to a loudspeaker or a plural of loudspeakers, the output port of said voltage driver coupled to the first input port of said second proportional adder/subtracter, the output port of said type 3 expander is coupled to the second input port of said second proportional adder/subtracter, the output port of said second proportional adder/subtracter is coupled to the second input port of said type 2 compressor, and either:
- said output port of said second proportional adder/subtracter is coupled to the input port of said optional type 1 Rp/Power supply emulator, the output port of said optional type 1 Rp/Power supply emulator is coupled to the second input port of said optional first proportional adder/subtracter, the output port of said type 2 compressor is coupled to the first input port of said optional first proportional adder/subtracter, the output port of said optional first proportional adder/subtracter is coupled to the input port of said type 3 expander, and is also coupled to the input port of said voltage driver, or:
- the output port of said type 2 compressor is coupled to the input port of said type 3 expander, and is also coupled to the input port of said voltage driver, whereby said speaker driving circuit can be used to emulate vacuum tube amplifiers, to achieve sound effects, or to protect speakers from damaging from excessive cone excursion, or any combination of them.
A speaker driving circuit without output transformer for nonlinearly modifying bass frequency components of input signal according to the amplitudes of those bass frequency components included in said input signal, while leaving higher frequency components included in said input signal approximately unaffected by said nonlinear modifying, comprising:
- a type 2 expander,
- a type 3 compressor,
- a voltage driver,
- a second proportional adder/subtracter,
- an optional first proportional adder/subtracter,
- an optional type 1 Rp/Power supply emulator,
- where the first input port of said type 2 expander receives said input signal, the first output terminal and the second output terminal of said voltage driver coupled to a loudspeaker or a plural of loudspeakers, the output port of said voltage driver coupled to the first input port of said second proportional adder/subtracter, the output port of said type 3 compressor is coupled to the input port of said voltage driver, the output port of said type 2 expander is coupled to the second input port of said second proportional adder/subtracter, the output port of said second proportional adder/subtracter is coupled to the input port of said type 3 compressor, and either:
- the output port of said type 2 expander is coupled to the input port of said optional type 1 Rp/Power supply emulator, the output port of said type 3 compressor is coupled to the first input port of said optional first proportional adder/subtracter, the output port of said optional type 1 Rp/Power supply emulator is coupled to the second input port of said optional first proportional adder/subtracter, the output port of said optional first proportional adder/subtracter is coupled to the input port of said type 2 expander, or:
- the output port of said type 3 compressor is coupled to the input port of type 2 expander, whereby said speaker driving circuit can be used to emulate vacuum tube amplifiers, to achieve sound effects, or to protect speakers from damaging from excessive cone excursion, or any combination of them.
A speaker driving circuit without output transformer for nonlinearly modifying bass frequency components of input signal according to the amplitudes of those bass frequency components included in said input signal, while leaving higher frequency components included in said input signal approximately unaffected by said nonlinear modifying, comprising:
- a type 2 compressor,
- a type 3 compressor,
- a voltage driver,
- a second proportional adder/subtracter,
- a first proportional adder/subtracter,
- a type 2 Rp/Power supply emulator,
- where the first input port of said type 2 compressor receives said input signal, the first output terminal and the second output terminal of said voltage driver coupled to a loudspeaker or a plural of loudspeakers, the output port of said voltage driver coupled to the first input port of said second proportional adder/subtracter, the output port of said type 3 compressor is coupled to the input port of said voltage driver, and is also coupled to the second input port of said first proportional adder/subtracter, the output port of said type 2 compressor is coupled to the first input port of said first proportional adder/subtracter, the output port of said first proportional adder/subtracter is coupled to the input port of said type 2 Rp/Power supply emulator, the output port of said type 2 Rp/Power supply emulator is coupled to the second input port of said second proportional adder/subtracter, and is also coupled to the input port of said type 2 compressor, whereby said speaker driving circuit can be used to emulate vacuum tube amplifiers, to achieve sound effects, or to protect speakers from damaging from excessive cone excursion, or any combination of them.
A speaker driving circuit without output transformer for nonlinearly modifying bass frequency components of input signal according to the amplitudes of those bass frequency components included in said input signal, while leaving higher frequency components included in said input signal approximately unaffected by said nonlinear modifying, comprising:
- a type 2 expander,
- a type 3 expander,
- a current driver,
- a second proportional adder/subtracter,
- an optional first proportional adder/subtracter,
- an optional type 1 Rp/Power supply emulator,
- where the first input port of said type 2 expander receives said input signal, the output port of said type 2 expander is coupled to the first input port of said second proportional adder/subtracter, the output port of said type 3 expander is coupled to the second input port of said second proportional adder/subtracter, the output port of said second input port of said second proportional adder/subtracter is coupled to the input port of said current driver, the first output terminal and the second output terminal of said current driver coupled to a loudspeaker or a plural of loudspeakers, the output port of said current driver is coupled to the input port of said type 3 expander, and either:
- the output port of said second proportional adder/subtracter is coupled to the input port of said optional type 1 Rp/Power supply emulator, the output port of said optional type 1 Rp/Power supply emulator is coupled to the second input port of said optional first proportional adder/subtracter, said output port of said current driver is coupled to the first input port of said optional first proportional adder/subtracter, the output port of said optional first proportional adder/subtracter is coupled to the input port of said type 2 expander, or:
- said output port of said current driver is coupled to the input port of said type 2 expander, whereby said speaker driving circuit can be used to emulate vacuum tube amplifiers, to achieve sound effects, or to protect speakers from damaging from excessive cone excursion, or any combination of them.
A speaker driving circuit without output transformer for nonlinearly modifying bass frequency components of input signal according to the amplitudes of those bass frequency components included in said input signal, while leaving higher frequency components included in said input signal approximately unaffected by said nonlinear modifying, comprising:
- a type 2 compressor,
- a type 3 expander,
- a current driver,
- a second proportional adder/subtracter,
- a first proportional adder/subtracter,
- a type 2 Rp/Power supply emulator,
- where the first input port of said type 2 compressor receives said input signal, the first output terminal and the second output terminal of said current driver coupled to a loudspeaker or a plural of loudspeakers, the output port of said current driver is coupled to the input port of said type 3 expander, and is also coupled to the second input port of said first proportional adder/subtracter, the output port of said type 3 expander is coupled to the second input port of said second proportional adder/subtracter, the output port of said second input port of said second proportional adder/subtracter is coupled to the input port of said current driver, the output port of said type 2 compressor is coupled to the first input port of said first proportional adder/subtracter, the output port of said first proportional adder/subtracter is coupled to the input port of said type 2 Rp/Power supply emulator, the output port of said type 2 Rp/Power supply emulator is coupled to the first input port of said second proportional adder/subtracter, and is also coupled to the input port of said type 2 compressor, whereby said speaker driving circuit can be used to emulate vacuum tube amplifiers, to achieve sound effects, or to protect speakers from damaging from excessive cone excursion, or any combination of them.
Dependencies are inferred from the claim text.