Method for detecting audio ticks in a noisy environment
First Claim
1. Method for detecting ticks on a device with which an audio signal is received in a noisy environment, from the audio signal which includes a stream of audio samples (y(n), (y′
- (n)), the method comprising the steps of;
applying the audio signal to a coarse tick detection processor arranged to decide whether the audio signal likely includes a tick; and
only if the course tick processor decides that the audio signal likely includes a tick, enabling a fine tick detection processor to decide, by more thorough processing of said audio signal, whether the audio signal represents a tick on the device, wherein the fine tick detection is performed using a comparison with a previously trained set of reference properties that are characteristic for the device with which the audio signal is received.
3 Assignments
0 Petitions
Accused Products
Abstract
A method for detecting, in an audio signal including a stream of audio samples (y(n), (y′(n)), ticks in a noisy environment, comprises the steps of applying the signal to a coarse tick detection processor arranged to decide whether it is likely that the signal includes a tick and, only then, enabling a fine tick detection processor to decide, by more thorough processing the audio signal, whether the audio signal represents an audio tick. The coarse processing step preferably includes buffering audio samples (y(n), (y′(n)), determining the maximum and minimum values of each sample, forming their local range, delaying the local range with one or more samples and comparing the difference between the actual local range and the delayed local range with a threshold value (Tc), and, if the difference exceeds the threshold value, outputting a trigger (nc) for enabling the fine detection processor The fine processing step preferably includes buffering audio samples (y(n), (y′(n)), computing, for each buffer content (Bp(n,m)), a Fast Fourier Transformed buffer content (Ec(ω,m)), determining the difference (Fc(ω,m)) between the resulting frequency components, comparing the difference (Fc(ω,m)) to the content of a previously trained fingerprint set (F*(ω,m)) and calculating a correlation coefficient (p(Fc,F*)) between them, comparing the correlation coefficient to a threshold value (TP) and, if the correlation coefficient exceeds the threshold value, outputting a signal indication the presence of a tick in the audio signal.
5 Citations
23 Claims
-
1. Method for detecting ticks on a device with which an audio signal is received in a noisy environment, from the audio signal which includes a stream of audio samples (y(n), (y′
- (n)), the method comprising the steps of;
applying the audio signal to a coarse tick detection processor arranged to decide whether the audio signal likely includes a tick; and only if the course tick processor decides that the audio signal likely includes a tick, enabling a fine tick detection processor to decide, by more thorough processing of said audio signal, whether the audio signal represents a tick on the device, wherein the fine tick detection is performed using a comparison with a previously trained set of reference properties that are characteristic for the device with which the audio signal is received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15, 16, 17, 18)
- (n)), the method comprising the steps of;
-
9. System for detecting, in an audio signal which includes a stream of audio samples (y(n), (y′
- (n)), ticks on a device with which the audio signal is received in a noisy environment, the system comprising a coarse tick detection processor and a fine tick processor, wherein the coarse tick processor is arranged to decide whether the signal likely includes a tick; and
, only if the course tick processor decides that the audio signal likely includes a tick, to enable the fine tick processor to decide, by more thorough processing of said audio signal, whether the audio signal represents a tick on the device, wherein the fine tick detection is performed using a comparison with a previously trained set of reference properties that are characteristic for the device with which the audio signal is received. - View Dependent Claims (10, 11, 12, 13, 14, 19)
- (n)), ticks on a device with which the audio signal is received in a noisy environment, the system comprising a coarse tick detection processor and a fine tick processor, wherein the coarse tick processor is arranged to decide whether the signal likely includes a tick; and
-
20. A method for detecting ticks in a noisy environment, from an audio signal received by a device, the audio signal including a stream of audio samples (y(n), (y′
- (n)), the method comprising the steps of;
applying the audio signal to a coarse tick detection processor adapted to decide whether the audio signal likely includes a tick; and only if the course tick processor decides that the audio signal likely includes a tick, enabling a fine tick detection processor to decide, by more thorough processing of said audio signal, whether the audio signal represents a tick, wherein the fine tick detection is performed using a comparison with predetermined reference properties that are characteristic for the device with which the audio signal is received, suppressing influence of background signals, by computing Fourier transforms of the audio samples in a plurality of buffers; determining differences between energies of respective frequency components of the Fourier transforms for successive buffers; and comparing the differences to contents of a previously trained reference set. - View Dependent Claims (21)
- (n)), the method comprising the steps of;
-
22. A system for detecting ticks from a noisy environment in an audio signal received by a device, wherein the audio signal includes a stream of audio samples (y(n), (y′
- (n)) of the noisy environment, the system comprising a coarse tick detection processor and a fine tick detection processor, wherein the coarse tick detection processor is adapted to decide whether the audio signal likely includes a tick; and
, only if the course tick processor decides that the audio signal likely includes a tick, to enable the fine tick detection processor to decide, by more thorough processing of said audio signal, whether the audio signal represents a tick, wherein the fine tick detection processor is configured to perform a comparison with predetermined reference properties that are characteristic for the device with which the audio signal is received, suppressing influence of background signals, bycomputing Fourier transforms of the audio samples in a plurality of buffers; determining differences between energies of respective frequency components of the Fourier transforms for successive buffers; and comparing the differences to contents of a previously trained reference set. - View Dependent Claims (23)
- (n)) of the noisy environment, the system comprising a coarse tick detection processor and a fine tick detection processor, wherein the coarse tick detection processor is adapted to decide whether the audio signal likely includes a tick; and
Specification