Methods and apparatus to perform audio watermark detection and extraction

摘要

Methods and apparatus to perform audio watermark detection and extraction are disclosed. An example method includes sampling a media signal to generate samples, wherein the media signal includes an embedded message, determining a first symbol value for a first block of the samples, determining a second symbol value for a second block of the samples, and determining, using a processor, a resulting symbol value, representative of a part of the embedded message, based on the first symbol value and the second symbol value for the first block of samples and the second block of samples, wherein the first block and the second block partially overlap.

主权项

1. A method for determining information embedded in media signals, the method comprising:
sampling, using a processor, a media signal to generate samples, wherein the media signal includes an embedded message; determining, using the processor, a first symbol value based on a first frequency spectrum determined for a first block of the samples; determining, using the processor, a second symbol value based on a second frequency spectrum determined for a second block of the samples; and determining, using the processor, a resulting symbol value, representative of a part of the embedded message, by voting based on the first symbol value for the first block of samples and the second symbol value for the second block of samples, wherein the first block and the second block partially overlap in time in the media signal.