Topic
Digital signal
About: Digital signal is a research topic. Over the lifetime, 44213 publications have been published within this topic receiving 345279 citations.
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27 Feb 2007
TL;DR: A new technique for non-intrusive scanner model identification is proposed, which can be further extended to perform tampering detection on scanned images.
Abstract: A large portion of digital image data available today is acquired using digital cameras or scanners While cameras
allow digital reproduction of natural scenes, scanners are often used to capture hardcopy art in more controlled
scenarios This paper proposes a new technique for non-intrusive scanner model identification, which can be
further extended to perform tampering detection on scanned images Using only scanned image samples that
contain arbitrary content, we construct a robust scanner identifier to determine the brand/model of the scanner
used to capture each scanned image The proposed scanner identifier is based on statistical features of scanning
noise We first analyze scanning noise from several angles, including through image de-noising, wavelet analysis,
and neighborhood prediction, and then obtain statistical features from each characterization Experimental
results demonstrate that the proposed method can effectively identify the correct scanner brands/models with
high accuracy
74 citations
TL;DR: This paper discusses the application of STFD to high-resolution direction finding and focuses on both the role and the effect of crossterms in angle estimation when multiple time-frequency points are incorporated.
74 citations
Patent•
26 Sep 1997
TL;DR: In this article, a dynamic volume control system in an audio processor uses gain and delay signals from a digital signal processor to dynamically control the user-selected volume of the audio processor.
Abstract: A dynamic volume control system in an audio processor uses gain and delay signals from a digital signal processor to dynamically control the user-selected volume of the audio processor. The digital signal processor executes audio signal processing operations that affect the gain applied to the audio signal so that the signal gain inherent in the signal processing path is known. The digital signal processor transfers the known gain and a predicted group delay signal to the dynamic volume control system to dynamically adjust the user-selected volume of the system. The digital signal processor is integrated with a digital-to-analog converter (DAC) in a dynamic volume control system that exploits the known gain and group delay to perform DAC volume control.
74 citations
Patent•
13 May 1999TL;DR: In this article, a receiver (100) requiring only a single IF SAW filter (120) and an IF amplifier (126) receives signals in both analog format and in digital format, such as the NTSC, PAL and SECAM analog television signal formats and the ATSC and DVB digital television signal format.
Abstract: A receiver (100) requiring only a single IF SAW filter (120) and IF amplifier (126) receives signals in both analog format and in digital format, such as the NTSC, PAL and SECAM analog television signal formats and the ATSC and DVB digital television signal formats. IF signals from the IF amplifier (126) are sub-sampled to digital signal form (130) and are processed by respective analog format (140) and digital format (150) processors. Control circuitry (160) responsive to the presence of certain unique components of the signals in analog format and digital format determine which of the analog format and digital format processors is producing valid data and selects the valid data to be utilized. In a television receiver (100), the unique components of the signals may include carrier signals, synchronization signals, pilot signals and symbol timing, and valid data is applied to a television display.
74 citations