Encoding system
First Claim
1. A method of encoding a given recorded signal made up of a host of frequencies, comprising:
- modifying the recorded signal to selectively alter in a known manner a portion of said recorded signal to produce a machine recognizable start code which is generally imperceptible to normal human recognition when the recorded signal is played in its intended manner and analyzing said signal after said start code to generate an identity code based upon particular signal characteristics which collectively are unique to the original recorded signal and by means of which the recorded signal can be identified.
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Accused Products
Abstract
The method of encoding a given recorded signal made up of a host of different frequencies comprises modifying the recorded signal to selectively alter in a known manner a portion of the recorded signal to produce a machine recognizable start code which is generally unperceptible to human recognition when the recorded signal is played in its intended manner. The signal is scanned and immediately after the start code, an identity code is generated based on the particular signal characteristics which collectively are unique to the recorded signal and by means of which the recorded signal can be identified. A recorded signal which has been encoded in accordance with this method has a start code which can be machine recognized during playing of the recorded signal. This recognized start code locates a portion of the signal used to identify the same. Apparatus for carrying out this particular method, both in encoding of the recorded signal and scanning of signals which have been encoded, form part of the present invention. This invention is particularly useful for monitoring of broadcast signals having included therein material covered by copyright.
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Citations
20 Claims
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1. A method of encoding a given recorded signal made up of a host of frequencies, comprising:
modifying the recorded signal to selectively alter in a known manner a portion of said recorded signal to produce a machine recognizable start code which is generally imperceptible to normal human recognition when the recorded signal is played in its intended manner and analyzing said signal after said start code to generate an identity code based upon particular signal characteristics which collectively are unique to the original recorded signal and by means of which the recorded signal can be identified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An encoder for encoding of a recorded audio signal, comprising:
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scanning means for scanning said recorded signal and determining therefrom a preferred location within the recorded signal for introducing a start code into the signal; means for noting information of the preferred location to allow the subsequent step of introducing the start code; means for using the information to return to the preferred location and introducing the start code; means for processing the signal in accordance with the start code and an algorithm for processing of the undisturbed recorded audio signal following the start code to produce an identity code unique to the recorded audio signal, and means for recording of the unique identity code. - View Dependent Claims (13, 14, 15, 16)
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17. A monitoring system comprising:
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means for receiving, from a predetermined source, a signal coded with a start code and followed with a signal portion which has not been coded and means for processing of the received signal to determine if a predetermined start code is provided in said received signal and means for subsequent processing of said following uncoded portion of said received signal upon recognition of a start code by using pattern recognition processing based upon said following portion to extract an identity code from the received signal based upon the characteristics of the signal following the start code, and means for recording of the identity code. - View Dependent Claims (18, 19, 20)
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Specification