Noise

About: Noise is a research topic. Over the lifetime, 5111 publications have been published within this topic receiving 69407 citations. The topic is also known as: Мопсы танцуют под радио бандитов из сталкера 10 часов.

Audio Steganography Using Bit Modification - A Tradeoff on Perceptibility and Data Robustness for Large Payload Audio Embedding

Abstract: Audio steganography using bit modification of time domain audio samples is a simple technique for multimedia data embedding with potential for large payload. Depending on the index of the bit used to modify the samples in accordance with the data to be hidden, the resulting stego audio signal may become perceptible and/or susceptible to incorrect retrieval of the hidden data. This paper presents some results of the tradeoff between the conflicting requirements of data robustness, payload and imperceptibility. Experimental results on both clean and noisy host audio signals indicate that while the payload can be as high as over 3000 bits/s - much higher rate than common audio data embedding techniques - noticeability of embedding is decreased and noise tolerance increased by using higher bit indices than the traditional least significant bit. Bit error rates of below one percent were observed for data retrieved from noise-added stego audio signals with 39 dB of SNR for an embedded payload of over 10 Kbits in a 3.3 s host audio.

A Novel Audio Watermarking Algorithm for Copyright Protection Based on DCT Domain

Abstract: Audio digital watermarking technology is the new means of audio reproduction, which can pre-implant the special data as a watermark to the audio signal which pass the information on behalf of the owner of identity and prove the user's legitimacy. The novel technology of embedding image data into the audio signal and additive audio watermarking algorithm based on DCT domain is proposed. AC DCT coefficients play different influence in robust and inaudibility. First, we decompose the audio into no overlapping blocks (eight data per block). Then every block performs the DCT operation: watermark is embedded by modulating AC DCT coefficient. Every block is embedded one bit message. Experimental results demonstrate that the watermark is inaudible and this algorithm is robust to common operations of digital audio signal processing, such as low-pass filtering, smoothing, adding noise and so on. The extracted watermark image quality is showed by considering normalize correlation (NC) value with a suitable scaling parameter for embedding.

Effects of broadband noise on cortical evoked auditory responses at different loudness levels in young adults.

Abstract: Young adults with no history of hearing concerns were tested to investigate their /da/-evoked cortical auditory evoked potentials (P1-N1-P2) recorded from 32 scalp electrodes in the presence and absence of noise at three different loudness levels (soft, comfortable, and loud), at a fixed signal-to-noise ratio (+3 dB). P1 peak latency significantly increased at soft and loud levels, and N1 and P2 latencies increased at all three levels in the presence of noise, compared with the quiet condition. P1 amplitude was significantly larger in quiet than in noise conditions at the loudest level. N1 amplitude was larger in quiet than in noise for the soft level only. P2 amplitude was reduced in the presence of noise to a similar degree at all loudness levels. The differential effects of noise on P1, N1, and P2 suggest differences in auditory processes underlying these peaks. The combination of level and signal-to-noise ratio should be considered when using cortical auditory evoked potentials as an electrophysiological indicator of degraded speech processing.