Patent Publication No:US 20050232411 A1.
Audio signature extraction, basically describes a method to detect a specific program or channel on basis of a unique key signature. This is used in television sets to identify various channel. The signature can be sent with data or when frame transmission is offline. The easiest method to implement this is using correlation. An incoming time domain moment can be captured and correlated with a stored reference signal to identify whether it belongs to a specific channel or not.
This patent includes 50 claims which include the methods of deriving the signal by segregating them into blocks and finding their spectral moments. At least one of these spectral moments is then converted into the signature.
Very Helpful!
ReplyDeleteHow do you remove error?
ReplyDeletethe error can be removed using a window function which will smoothen out the waveform
DeleteWhat exactly do you understand about correlation? What is it used for here?
ReplyDeletecorrelation is used to find similarity between two signals. An incoming time domain moment has been captured and correlated with a stored reference signal in this patent
DeleteThe feature extraction can be used to identify audio signatures of various sounds in the environment
ReplyDeleteYes like sounds produced by different birds can be identified
DeleteWhat about errors?
ReplyDeletevery insightful patent link
ReplyDelete