Method and apparatus for measuring characteristics of an audio system using a tapered chirp
First Claim
7-1. The method of claim 1, wherein the starting frequency, the ending frequency, the intermediate time duration, and the beginning taper time duration are selected, and an onset chirp frequency, final chirp frequency and total chirp duration are determined automatically.
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Abstract
An apparatus and method for measuring the characteristics of an audio system using a tapered chirp. A starting frequency and an ending frequency for a chirp signal during which the chirp signal has a constant envelope amplitude are determined for the audio system to be measured. An intermediate time duration during which the chirp signal has the constant envelope amplitude is determined for the audio system to be measured. A beginning envelope amplitude taper on time duration is also determined for the audio system to be measured. A chirp signal having the starting frequency, the ending frequency, the intermediate time duration, and the beginning envelope amplitude taper time duration is applied as an input to the audio system to be measured. The resulting output signal from the audio system to be measured is acquired to determine the characteristics of the audio system is acquired. A signal source for generating the chirp signal is provided. A chirp parameter selection mechanism is provided for determining the starting frequency, the ending frequency, the constant envelope amplitude time duration, and the beginning envelope amplitude taper on time duration. A signal acquisition device acquires an output signal from the audio system, and a signal processing device determines one or more response characteristics of the audio system to be measured based on the output signal and the chirp signal. Preferably, the frequency of the chirp signal changes exponentially.
11 Citations
33 Claims
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7-1. The method of claim 1, wherein the starting frequency, the ending frequency, the intermediate time duration, and the beginning taper time duration are selected, and an onset chirp frequency, final chirp frequency and total chirp duration are determined automatically.
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10. The method of claim 9, wherein the chirp frequency changes exponentially from the onset of the chirp until the termination of the chirp.
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11. The method of claim 9, wherein the envelope amplitude taper on function is a cosine squared function.
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18. An apparatus for measuring the characteristics of an audio system using a tapered chirp signal, comprising:
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a signal source for generating a chirp signal to be applied to an input of an audio system, the chirp signal having a starting frequency, an ending frequency, an intermediate time duration during which the envelope amplitude is constant, and a beginning envelope amplitude taper on time duration;
a chirp parameter selection mechanism for determining the starting frequency, the ending frequency, the constant envelope amplitude time duration, and the beginning envelope amplitude taper on time duration;
a signal acquisition device for acquiring an output signal from the audio system to be measured; and
a signal processing device for determining one or more response characteristics of the audio system to be measured based on the output signal and the chirp signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification