Matching a watermark to a host sampling rate

A sampling rate, matching technology, applied in speech analysis, instruments, etc., can solve the problems of wasting watermarking channels, expensive computing overhead, etc., and achieve the effect of avoiding the accumulation of errors

Inactive Publication Date: 2009-10-14
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, this additional computational overhead is very expensive
[0005] Another solution is to match a watermark sampled and optimized at a given frequency to another frequency, which involves zero-padding the watermark, however, such an approach wastes the watermark by carrying less information than it could possibly carry channel

Method used

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  • Matching a watermark to a host sampling rate
  • Matching a watermark to a host sampling rate
  • Matching a watermark to a host sampling rate

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Embodiment Construction

[0033] Generating, embedding and detecting watermarks in multimedia signals can be done in many ways. Published patent applications WO 03 / 083858, WO 03 / 083860 and WO 05 / 029466 disclose such methods and are hereby incorporated by reference. In the present invention, a watermark sampled at a first sampling rate is matched with a main multimedia signal sampled at a second sampling rate. After the watermark has been matched to the sampling rate of the multimedia signal, the matched watermark can be embedded into the multimedia signal by known embedding techniques, eg as disclosed by the above three published patent applications. The watermark may be embedded at the same location continuously after the matching process and possibly by the same device, however the matched watermark may also be transmitted via a communication line (such as the Internet or other computer network) or via a record carrier for use in another A later implementation at an address.

[0034] Figure 1A Sch...

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Abstract

The invention deals with matching of a watermark to a host sampling rate of a multimedia signal. A watermark sampled at a first sampling rate is matched to multimedia host signal sampled at a second sampling rate, in a process where the watermark sampled at the first sampling rate is received, a scaling factor between the first sampling rate and the second sampling rate is determined, and re-scale widths of the watermark symbols are set. A modified watermark is generated wherein the watermark symbols of the modified watermark being of re-scale widths, so as to substantially match the modified watermark sequences to the second sampling rate.

Description

technical field [0001] The present invention relates to watermarking of multimedia signals, and in particular to watermarking with sampled watermarks. Background technique [0002] Digital watermarking is a technique that can be used for various purposes such as: certification of copyright owners, tracking of illegal copying, control of copy control devices, broadcast monitoring, authentication verification, adding auxiliary information to multimedia signals, etc. [0003] In consumer digital devices such as CDs, the nominal sampling frequency is 44.1 kHz. This is the sample rate chosen especially when designing audio watermarking algorithms. However, for high-end audio equipment, sampling rates of 48kHz and higher are found, and lower sampling rates may also be chosen for a given purpose. At these frequencies (ie, frequencies other than 44.1 kHz), watermark optimization for a sampling rate of 44.1 kHz may result in the watermark not being detected properly or the watermar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/018
CPCG10L19/018
Inventor J·F·阿普雷亚A·N·莱马
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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