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Method and apparatus for identifying broadcast digital audio signals include structure and/or function whereby the digital audio signal is provided to processing structure which is configured to (i) identify a program-identifying code in the received digital audio signal, (ii) identify a program-ide

Method and apparatus for identifying broadcast digital audio signals include structure and/or function whereby the digital audio signal is provided to processing structure which is configured to (i) identify a program-identifying code in the received digital audio signal, (ii) identify a program-identifying code in a decompressed received digital audio signal, (iii) identify a feature signature in the received digital audio signal, and (iv) identify a feature signature in the decompressed received digital audio signal. Preferably, such processing structure is disposed in a dwelling or a monitoring site in an audience measurement system, such as the Nielsen TV ratings system.

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What is claimed is: 1. Apparatus for identifying a digital audio signal, comprising: an input which receives the digital audio signal, wherein the digital audio signal contains data from a broadcast or stored digital program signal; and structure configured to (i) identify a program-identifying cod

What is claimed is: 1. Apparatus for identifying a digital audio signal, comprising: an input which receives the digital audio signal, wherein the digital audio signal contains data from a broadcast or stored digital program signal; and structure configured to (i) identify a program-identifying code in a compressed portion of the received digital audio signal, (ii) identify a program-identifying code in a decompressed or uncompressed received digital audio signal, (iii) identify a feature signature in a compressed portion of the received digital audio signal, and (iv) identify a feature signature in the decompressed or uncompressed received digital audio signal. 2. Apparatus according to claim 1, wherein said structure time-stamps the identified signals. 3. Apparatus according to claim 2, further comprising a clock which supplies a clock signal to said structure. 4. Apparatus according to claim 2, further comprising a memory for storing the time-stamped identified signals. 5. Apparatus according to claim 4, further comprising transmission structure for transmitting the stored, time-stamped identified signals to a collection site. 6. Apparatus according to claim 1, wherein said structure is disposed in a dwelling. 7. Apparatus according to claim 1, wherein said structure is disposed in a verification site. 8. Apparatus according to claim 1, wherein said structure is disposed in a monitoring site. 9. Apparatus according to claim 1, further comprising a tuner which receives a broadcast program signal and outputs the digital audio signal to said input. 10. Apparatus according to claim 1, wherein the program-identifying code is placed in an aux data field in the digital audio signal by a broadcaster and/or a program producer. 11. Apparatus according to claim 10, wherein the program identifying code is Program System Information Protocol (PSIP) data, Content ID data, and/or other useful data which are placed in the aux data field by the broadcaster and/or any other participant in the distribution system. 12. Apparatus according to claim 10, wherein the program identifying code is program related data which are copied from bitstream data areas outside the aux data field into the aux data field by the broadcaster and/or other participant in the distribution system. 13. Apparatus according to claim 1, wherein stuffing data in the digital audio signal is altered with data which corresponds to viewing activity information. 14. Apparatus according to claim 1, wherein the program-identifying code and the feature signal correspond to an Internet transmission. 15. A method for identifying a digital audio signal, the method comprising: receiving the digital audio signal at an input, wherein the digital audio signal contains data from a broadcast or stored digital program signal; and configuring processing structure to (i) identify a program-identifying code in a compressed portion of the received digital audio signal, (ii) identify program-identifying code in a decompressed received digital audio signal, (iii) identify a feature signature in a compressed portion of the received digital audio signal, and (iv) identify a feature signature in the decompressed received digital audio signal. 16. A method according to claim 15, wherein said processing structure time-stamps the identified signals. 17. A method according to claim 16, further comprising supplying a clock signal to said processing structure. 18. A method according to claim 16, further comprising storing the time-stamped identified signals. 19. A method according to claim 18, further comprising transmitting the stored, time-stamped identified signals to a collection site. 20. A method according to claim 15, wherein said processing structure is disposed in a dwelling. 21. A method according to claim 15, wherein said processing structure is disposed in a verification site. 22. A method according to claim 15, wherein said processing structure is disposed in a monitoring site. 23. A method according to claim 15, further comprising using a tuner to receive a broadcast program signal and output the digital audio signal to said input. 24. A computer readable storage medium which causes one or more computers to carry out a method for identifying a digital audio signal, the computer readable storage medium causing the one or more computers to: input the digital audio signal, wherein the digital audio signal contains data from a broadcast or stored digital program signal; and configure processing structure to (i) identify a program-identifying code in a compressed portion of the received digital audio signal, (ii) identify a program-identifying code in a decompressed received digital audio signal, (iii) identify a feature signature in a compressed portion of the received digital audio signal, and (iv) identify a feature signature in the decompressed received digital audio signal. 25. A computer readable storage medium according to claim 24, wherein said processing structure is configured to time-stamp the identified signals. 26. A computer readable storage medium according to claim 25, further comprising supplying a clock signal to said processing structure. 27. A computer readable storage medium according to claim 25, further comprising storing the time-stamped identified signals. 28. A computer readable storage medium according to claim 27, further comprising transmitting the stored, time-stamped identified signals to a collection site. 29. A computer readable storage medium according to claim 24, wherein said processing structure is disposed in a dwelling. 30. A computer readable storage medium according to claim 24, wherein said processing structure is disposed in a verification site. 31. A computer readable storage medium according to claim 24, wherein said processing structure is disposed in a monitoring site. 32. A computer readable storage medium according to claim 24, further comprising using a tuner to receive a broadcast program signal and output the digital audio signal to said processing structure.