Process and circuit arrangement for the automatic recognition of signal sequences
First Claim
1. A method for automatically recognizing a plurality of preset signal sequences in a broadcast signal comprising the steps of:
- generating one preset envelope signal from each of said plurality of preset signal sequences;
differentiating each preset envelope signal to obtain differentiated preset envelope signals;
transforming each differentiated preset envelope signal into digital, level-normalized, non-coded preset envelope signals by determining the signs of each differentiated envelope signal;
storing preset time segments for each of said sign-coded, preset envelope signals;
generating a broadcast envelope signal from said broadcast signal that is to be examined;
differentiating said broadcast envelope signal;
transforming said differentiated broadcast envelope signal into a digital, level-normalized, sign-coded broadcast envelope signal by determining the signs of said differentiated broadcast envelope signal;
comparing time segments of the sign-coded broadcast envelope signal with the stored present time segments of the preset envelope signals of the present signal sequences; and
when a preset degree of concordance is exceeded, generating a recognition signal.
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Accused Products
Abstract
An arrangement for automatically recognizing signal sequences such as spe and/or music signals, particularly useful for statistical evaluation of the frequency of play of music titles, commercial advertising spots, or verbal materials, etc. One envelope signal is generated from each preset signal sequence (e.g., music title) and time segments of the envelope signals are stored. An envelope signal is also generated from a signal sequence that is to be examined. Time segments of the envelope signal of the signal sequence to be examined are continually compared with the stored segments of the envelope signals of the preset signal sequences. When a preset degree of concordance is exceeded, a recognition signal is generated.
341 Citations
20 Claims
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1. A method for automatically recognizing a plurality of preset signal sequences in a broadcast signal comprising the steps of:
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generating one preset envelope signal from each of said plurality of preset signal sequences; differentiating each preset envelope signal to obtain differentiated preset envelope signals; transforming each differentiated preset envelope signal into digital, level-normalized, non-coded preset envelope signals by determining the signs of each differentiated envelope signal; storing preset time segments for each of said sign-coded, preset envelope signals; generating a broadcast envelope signal from said broadcast signal that is to be examined; differentiating said broadcast envelope signal; transforming said differentiated broadcast envelope signal into a digital, level-normalized, sign-coded broadcast envelope signal by determining the signs of said differentiated broadcast envelope signal; comparing time segments of the sign-coded broadcast envelope signal with the stored present time segments of the preset envelope signals of the present signal sequences; and when a preset degree of concordance is exceeded, generating a recognition signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuit arrangement for automatically recognizing a plurality of preset signal sequences in a broadcast signal comprising:
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means for generating a plurality of preset envelope signals and broadcast envelope signals, said generating means comprising a rectifier circuit and a bandpass filter circuit; means for differentiating said preset envelope signals and said broadcast envelope signals to obtain differentiated preset envelope signals and differentiated broadcast envelope signals, respectively; means for transforming said differentiated preset envelope signals and said differentiated broadcast envelope signals into digital, level-normalized, sign-coded preset envelope signals and digital level-normalized, sign-coded broadcast envelope signals, respectively, by determining the sign of each differentiated signal; a first memory in which preset time segments of the sign-coded preset envelope signals of preset signal sequences are stored; a second memory in which broadcast time segments of the sign-coded broadcast envelope signal of a signal sequence to be examined are stored; a comparator which continually compares the particular contents of the second memory with the contents of the first memory and which, when a preset degree of concordance is exceeded, generates a recognition signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A circuit arrangement for generating a plurality of preset signal sequences comprising:
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means for generating a plurality of preset envelope signals, said generating means comprising a rectifier circuit and a bandpass filter circuit; means for differentiating said preset envelope signals to obtain differentiated preset envelope signals; means for transforming said differentiated preset envelope signals into digital, level-normalized, sign-coded preset envelope signals by determining the sign of each differentiated signal; and a first memory in which preset time segments of the sign-coded preset envelope signals of preset signal sequences are stored.
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20. A circuit arrangement for automatically recognizing a plurality of sign-coded preset signal sequences in a broadcast signal comprising:
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means for generating a plurality of broadcast envelope signals, said generating means comprising a rectifier circuit and a bandpass filter circuit; means for differentiating said broadcast envelope signals to obtain differentiated broadcast envelope signals, respectively; means for transforming said differentiated broadcast envelope signals into digital, level-normalized, sign-coded broadcast envelope signals, respectively, by determining the sign of each differentiated signal; a first memory in which preset time segments of the sign-coded preset envelope signals of preset signal sequences are stored; a second memory in which broadcast time segments of the sign-coded broadcast envelope signal of a signal sequence to be examined are stored; and a comparator which continually compares the particular contents of the second memory with the contents of the first memory and which, when a preset degree of concordance is exceeded, generates a recognition signal.
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Specification