disclosed herein are methods and systems for encoding digital watermarks into content signals . also disclosed are systems and methods for detecting and / or verifying digital watermarks in content signals . according to one embodiment , a system for encoding of digital watermark information includes : a window identifier for identifying a sample window in the signal ; an interval calculator for determining a quantization interval of the sample window ; and a sampler for normalizing the sample window to provide normalized samples . according to another embodiment , a system for pre - analyzing a digital signal for encoding at least one digital watermark using a digital filter is disclosed . according to another embodiment , a method for pre - analyzing a digital signal for encoding digital watermarks comprises : providing a digital signal ; providing a digital filter to be applied to the digital signal ; and identifying an area of the digital signal that will be affected by the digital filter based on at least one measurable difference between the digital signal and a counterpart of the digital signal selected from the group consisting of the digital signal as transmitted , the digital signal as stored in a medium , and the digital signal as played backed . according to another embodiment , a method for encoding a watermark in a content signal includes the steps of splitting a watermark bit stream ; and encoding at least half of the watermark bit stream in the content signal using inverted instances of the watermark bit stream . other methods and systems for encoding / decoding digital watermarks are also disclosed .