Determining agreement between an analysis signal and at least one reference signal
First Claim
1. A method of determining concordance of an analysis signal with at least one reference signal comprising forming smoothed envelopes of the analysis signal and the reference signal, generating a pulse train for each of the smoothed envelopes comprising pulses which have a duration determined by the time of a predetermined relationship of the envelopes, above or below a threshold signal, said pulse trains respectively representing the analysis signal and the reference signal, and subsequently registering the simultaneous occurence of pulses in the two trains in a predetermined number of consecutive comparisons made each time a pulse occurs in the reference signal pulse train constituting the criterion for the analysis signal and the reference signal being in concordance.
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Abstract
A method and apparatus for determining concordance between an analysis signal with at least one reference signal. The smoothed signals or envelopes are formed of a signal which is to be examined and at least one reference signal. A pulse train is generated for each of the smoothed signals or envelopes, and comprises pulses present during the time for a predetermined polarity of the smoothed signal or envelopes relative a threshold signal. The pulse trains are compared at regular intervals with each other, simultaneous coincidence of pulses in both trains at a predetermined number of consecutive comparisons constituting the criterion that the signals which are to be examined are in concordance with the reference signal. For carrying out this signal examination there are circuits means (2, 4) adapted for forming the smoothed signals or envelopes of the signals. The outputs from said means are connected to one input of a comparator (6) for each signal. A threshold signal (URef1, URef2) is applied to the second input of the comparators for generating an output pulse train comprising pulses generated at a predetermined polarity of said smoothed signals or envelopes relative the threshold signals. Circuits (12, 14, 16, 18) are further adapted for comparing the pulse trains and registering simultaneous coincidence of pulses in the two trains for a predetermined number of consecutive comparisons as the criterion that the examined signal and a given reference signal are in concordance. The invention is primarily intended for utilizing in automatic debiting of utilized video service in a hotel or the like. The invention may also be used for monitoring processes or machines which have specific sound spectra for faults.
108 Citations
10 Claims
- 1. A method of determining concordance of an analysis signal with at least one reference signal comprising forming smoothed envelopes of the analysis signal and the reference signal, generating a pulse train for each of the smoothed envelopes comprising pulses which have a duration determined by the time of a predetermined relationship of the envelopes, above or below a threshold signal, said pulse trains respectively representing the analysis signal and the reference signal, and subsequently registering the simultaneous occurence of pulses in the two trains in a predetermined number of consecutive comparisons made each time a pulse occurs in the reference signal pulse train constituting the criterion for the analysis signal and the reference signal being in concordance.
- 4. Apparatus for determining the concordance of an analysis signal with at least one reference signal comprising means for forming smoothed envelopes of the analysis signal and the reference signal, a comparator having a first input connected to receive the envelope output from each said forming means, each comparator having a second input connected to receive a threshold signal and being operable to generate an output pulse train consisting of pulses which have a duration determined by the time of a predeterined relationship above or below said threshold signal, said pulse train representing said analysis signal and said reference signal, and means for registering simultaneous occurrence of pulses in both pulse trains in a predetermined number of consecutive comparisons made each time a pulse occurs in the reference signal pulse train as the criterion for concordance between the analysis and reference signals.
Specification