Method for adapting a sound converter to a reference sound converter

Abstract

The method for adapting a sound converter to a reference sound converter includes the sound converter having a first linear transfer function with a first frequency response, a second linear transfer function with a second frequency response, and a trivial nonlinearity. The sound converter has a non-linear transfer function corresponding to the frequency response from combination of the first linear transfer function, the trivial nonlinearity, and the second linear transfer function. A first frequency spectrum of the reference sound converter is determined at a low input level. A second frequency spectrum of the reference sound converter is determined at a high input level. The second determined frequency spectrum is used as the second frequency response in the second linear transfer function, and the division of the first frequency spectrum by the second frequency spectrum is used as the first frequency response in the first linear transfer function.

Claims

1. A method for preparing a sound converter to adapt a sound of the sound converter to a sound of a reference sound converter, the method comprising the steps of: determining a first frequency spectrum of the sound converter with an intrinsic profile, wherein the sound converter has a first linear transfer function having a first frequency response, a second linear transfer function having a second frequency response, and a trivial nonlinearity connected between said first linear transfer function and said second linear transfer function, wherein the sound converter has a non-linear transfer function corresponding to a frequency response resulting from a combination of said first linear transfer function, said trivial nonlinearity, and said second linear transfer function, and wherein said first frequency spectrum is determined at a first input level, corresponding to said intrinsic profile not being influenced by said trivial nonlinearity; and determining a second frequency spectrum at a second input level, corresponding to said intrinsic profile being influenced by said trivial nonlinearity, wherein the step of determining said second frequency spectrum is comprised of the steps of: using a sweep having exponential frequency curve as an input signal at said second input level, measuring a corresponding output signal of the sound converter, and deconvoluting said output signal using said input signal so as to generate a second determined frequency spectrum, wherein said second determined frequency spectrum is comprised of said second frequency response in said second linear transfer function, wherein a division of said first frequency spectrum by said second frequency spectrum is comprised of said first frequency response in said first linear transfer function, and wherein said second linear transfer function comprises a second phase response determined from the step of deconvoluting said output signal.

2. The method for preparing a sound converter to adapt a sound of the sound converter to a sound of a reference sound converter, as in claim 1, wherein said sweep is comprised of a sine sweep having an exponential frequency curve.

3. The method for preparing a sound converter to adapt a sound of the sound converter to a sound of a reference sound converter, as in claim 1, wherein said sweep has an initial frequency of greater than 20 Hz.

4. The method for preparing a sound converter to adapt a sound of the sound converter to a sound of a reference sound converter, as in claim 1, wherein said sweep has a cutoff frequency of less than 20 kHz.

5. The method for preparing a sound converter to adapt a sound of the sound converter to a sound of a reference sound converter, as in claim 1, wherein the step of determining said first frequency spectrum is comprised of the steps of: using another sweep having an exponential frequency curve as another input signal at said first input level, measuring another corresponding output signal of the sound converter, and deconvoluting said another output signal using said another input signal.

6. The method for preparing a sound converter to adapt a sound of the sound converter to a sound of a reference sound converter, as in claim 5, wherein said first linear transfer function comprises a first phase response determined from the step of deconvoluting said another output signal.

7. The method for preparing a sound converter to adapt a sound of the sound converter to a sound of a reference sound converter, as in claim 1, wherein the sound converter is comprised of a digital circuit.

8. The method for preparing a sound converter to adapt a sound of a sound converter to a sound of a reference sound converter, as in claim 1, wherein the sound converter is comprised of a digital guitar amplifier.

9. The method for preparing a sound converter to adapt a sound of a sound converter to a sound of a reference sound converter, as in claim 1, wherein the sound converter is comprised of a signal generator for sweeps having an exponential signal curve.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) The invention will be explained in greater detail hereinafter on the basis of exemplary embodiments.

(2) FIG. 1 shows a schematic view of an illustration of music playback using a sound converter.

(3) FIG. 2 shows a schematic view of an illustration of the sound converter.

(4) FIG. 3 shows a schematic view of an illustration of music playback using a reference sound converter.

(5) FIG. 4 shows a schematic view of a flow chart for adapting the sound converter to the reference sound converter.

DETAILED DESCRIPTION OF THE INVENTION

(6) The sound converter 100 shown in FIGS. 1 and 2 has an input 101 for an input signal and an output 102 for an output signal. Furthermore, the sound converter 100 has a first linear transfer function 111 having a first frequency response and a second linear transfer function 112 having a second frequency response. A trivial nonlinearity 130 is connected between the first linear transfer function 111 and the second linear transfer function 112. For example, the signal from a pickup of an electric guitar 141 can be used as the input signal of the sound converter 100. The output signal of the sound converter 100 can then, optionally after further amplification, be output as a sound signal via a loudspeaker 142, so that the listeners 150 can perceive the guitar music. The sound reproduced via the loudspeaker 142 can therefore be influenced by means of the sound converter 100.

(7) An example of a reference sound converter 200 is illustrated in FIG. 3. In the exemplary embodiment shown, the signal from a pickup of the electric guitar 141 is amplified using a classic guitar amplifier 221 and output as sound via the monitor loudspeaker integrated into the guitar amplifier 221. The sound is then recorded by means of a microphone 222 and, if necessary after further amplification, output via the loudspeakers 142 so that the listeners 150 can hear the guitar music. The guitar amplifier 221 used, its monitor loudspeaker, and the microphone significantly influence the sound perceived by the listener 150.

(8) In the present case, the sound converter 100 is to be adapted in terms of its sound to the sound of the given reference sound converter 200.

(9) For this purpose, as shown in FIG. 4, a first frequency spectrum of the reference sound converter is determined at a first input level or low input level, i.e., at a low amplitude of the input signal (step 410). A second frequency spectrum of the reference sound converter is then determined at a second or high input level (step 420). For this purpose, a sweep, in particular a sine sweep having an exponential frequency curve, is used as the input signal and the corresponding output signal is measured (step 421). By deconvoluting the output signal using the input signal (step 422), the second frequency spectrum of the reference sound converter is determined. This can be done by cutting out the linear pulse response from the time signal resulting from the deconvolution (step 423). The second determined frequency spectrum is then used as the second frequency response in the second linear transfer function (430). By dividing the first frequency spectrum by the second frequency spectrum, the first frequency response is then obtained (step 440), which is used in the first linear transfer function.

(10) A particularly simple method is therefore proposed, using which a sound converter can be adapted to a reference sound converter.

LIST OF REFERENCE NUMBERS

(11) 100 sound converter 101 input of the sound converter 102 output of the sound converter 111 first linear transfer function 112 second linear transfer function 130 trivial nonlinearity 141 electric guitar 142 speakers 150 listeners 200 reference sound converter 201 input of the reference sound converter 202 output of the reference sound converter 221 guitar amplifier having integrated monitor speaker 222 microphone