Digital watermarking of tonal and non-tonal components of media signals

A method of detecting a digital watermark in a signal comprising:

• performing tonal detection on the signal to identify tonal components and non-tonal components;
• detecting a digital watermark in the tonal and non-tonal components, including performing different watermark detecting methods in the tonal components and the non-tonal components, a first detecting method evaluating the tonal components to detect a first type of modification to the tonal components, and a second detecting method evaluating non-tonal components to detect a second type of modification to the non-tonal components, the first and second types of modifications being different.

A method of embedding a digital watermark in a signal comprising:

• performing tonal detection on the signal to identify tonal components and non-tonal components;
• and
• embedding a digital watermark in the tonal components by shifting position of the tonal components according to a pattern to embed data into the tonal components.

A method of detecting a digital watermark in a signal comprising:

• performing tonal detection on the signal to identify tonal components and non-tonal components;
• and
• evaluating positions of the tonal components to detect shifts in position of the tonal components, the digital watermark being conveyed in the shifts in position of the tonal components.