Device for analyzing auscultation sounds, in particular respiratory sounds
First Claim
1. A device for analyzing mediate-auscultation noises, in particular respiratory noises, comprising:
- an input for receiving a time-domain signal (S(t)) representative of an acoustic noise, sampled in a multiplicity of intensities (I(m)) each associated with a chosen instant (m), storage means including, a processing module configured to work together with calculating means with a view to evaluating a set of transformed intensities (IT(fk)), each associated with a predetermined audio frequency (fk), while the storage means are further configured to store said transformed intensities in memory, and an output (26) linked, on the one hand, to the storage means in order to deliver each transformed intensity in correspondence with an associated frequency, and, on the other hand, to means for representing the transformed intensities as a function of the frequencies, with a view to obtaining a spectral representation of the auscultation noise, characterized in that the processing module is configured to evaluate a phase for each intensity (Φ
[I(m)]), as a function of a difference between the associated chosen instant (m) and a chosen start instant (m0), with a view to attributing, to each intensity, a complex value (Ic(n)) and its conjugate value (Ic*(n)), in that the processing module is further configured to evaluate a set of transformed intensities (IT(m, fk)) for each chosen instant (m), by producing, for each frequency (fk), a sum over a multiplicity of current instants (n) of terms resulting from a product involving, for each current instant (n), a) the complex intensity (Ic(m+n)) associated with the sum of the chosen instant (m) and of the current instant (n), b) the conjugate complex intensity (Ic*(m−
n)), associated with the difference in the chosen instant and in the current instant, and c) a complex exponential of a pure imaginary product of the frequency (fk) and the current instant (n), and in that the storage means are configured to store in memory each transformed intensity (IT) as a function of an associated frequency (fK), on the one hand, and of a chosen instant (m), on the other hand, which makes it possible to obtain a three-dimensional representation in terms of time (m) and of frequencies (fk) of the auscultation noise, while preserving a real-time scale.
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Abstract
The invention concerns a device for analysing medical sounds, in particular respiratory sounds, comprising an input receiving a sound signal sampled in intensity levels each associated with a selected time, and storage means (2, 4, 5) comprising a processing module for evaluating, in cooperation with computing means (3), a set of transformed intensity levels, each associated with a predetermined sound frequency. It further comprises an output (26) connected to the storage means (2) for delivering each transformed intensity level in correspondence with an associated frequency, and means for representing (6, 90, 91) intensity levels transformed on the basis of frequencies, to obtain a spectral representation of the auscultation sound. The invention is characterised in that the processing module is further capable of evaluating a set of transformed intensity levels for each selected time, and the storage means (2) store each intensity level transformed on the basis of an associated frequency, and of a selected time, thereby providing a three-dimensional representation in time and in frequencies of the auscultation sound.
32 Citations
15 Claims
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1. A device for analyzing mediate-auscultation noises, in particular respiratory noises, comprising:
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an input for receiving a time-domain signal (S(t)) representative of an acoustic noise, sampled in a multiplicity of intensities (I(m)) each associated with a chosen instant (m), storage means including, a processing module configured to work together with calculating means with a view to evaluating a set of transformed intensities (IT(fk)), each associated with a predetermined audio frequency (fk), while the storage means are further configured to store said transformed intensities in memory, and an output (26) linked, on the one hand, to the storage means in order to deliver each transformed intensity in correspondence with an associated frequency, and, on the other hand, to means for representing the transformed intensities as a function of the frequencies, with a view to obtaining a spectral representation of the auscultation noise, characterized in that the processing module is configured to evaluate a phase for each intensity (Φ
[I(m)]), as a function of a difference between the associated chosen instant (m) and a chosen start instant (m0), with a view to attributing, to each intensity, a complex value (Ic(n)) and its conjugate value (Ic*(n)),in that the processing module is further configured to evaluate a set of transformed intensities (IT(m, fk)) for each chosen instant (m), by producing, for each frequency (fk), a sum over a multiplicity of current instants (n) of terms resulting from a product involving, for each current instant (n), a) the complex intensity (Ic(m+n)) associated with the sum of the chosen instant (m) and of the current instant (n), b) the conjugate complex intensity (Ic*(m−
n)), associated with the difference in the chosen instant and in the current instant, andc) a complex exponential of a pure imaginary product of the frequency (fk) and the current instant (n), and in that the storage means are configured to store in memory each transformed intensity (IT) as a function of an associated frequency (fK), on the one hand, and of a chosen instant (m), on the other hand, which makes it possible to obtain a three-dimensional representation in terms of time (m) and of frequencies (fk) of the auscultation noise, while preserving a real-time scale. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of analyzing mediate-auscultation noises respiratory of the type comprising the following stages:
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a) sampling a time-domain signal (S(t)), representative of an acoustic noise, in a multiplicity of intensities (I(m)) each associated with a chosen instant (m), b) evaluating a set of transformed intensities (IT(fk)), each associated with a predetermined audio frequency (fk), c) storing said transformed intensities in memory, and d) delivering each transformed intensity in correspondence with an associated frequency, with a view to obtaining a spectral representation of the auscultation noise, characterized in that stage a) further includes the choice of a start instant (m0), in that stage b) comprises the following operations;
b1) evaluating a phase for each intensity (Φ
[I(m)]), as a function of a difference between the associated chosen instant (m) and the start instant (m0), with a view to attributing, to each intensity, a complex value (Ic(n)) and its conjugate value (Ic*(n)),b2) evaluating a product involving, for a current instant (n);
the complex intensity (Ic(m+n)) associated with the sum of the chosen instant (m) and of the current instant (n), the conjugate complex intensity (Ic*(m−
n)) associated with the difference in the chosen instant and in the current instant, anda complex exponential of a pure imaginary product of the frequency (fk) and the current instant (n), b3) evaluating a set of transformed intensities (IT(m, fk)) for each chosen instant (m), by forming, for each frequency (fk), a sum over a multiplicity of current instants (n) of terms resulting from the products obtained at operation b2), in that, in the course of stage c), each transformed intensity (IT) is stored in memory as a function of an associated frequency (fk), on the one hand, and of a chosen instant (m), on the other hand, and in that, in the course of stage d), each transformed intensity is delivered in correspondence with an associated frequency (fk), on the one hand, and with a chosen instant (m), on the other hand, which makes it possible to obtain a three-dimensional representation in terms of time (m) and of frequencies (fk) of the auscultation noise, while preserving a real-time scale. - View Dependent Claims (15)
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Specification