4 research outputs found

    Statistical Digital Watermarks of Audio Signals

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    Π ΠΎΠ·Ρ€ΠΎΠ±Π»Π΅Π½Ρ– Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΠΈ вбудовування Ρ– виявлСння Ρ†ΠΈΡ„Ρ€ΠΎΠ²ΠΈΡ… водяних Π·Π½Π°ΠΊΡ–Π² Π² Π·Π²ΡƒΠΊΠΎΠ²Ρ– сигнали Π½Π° основі Π°Π½Π°Π»Ρ–Π·Ρƒ ΠΊΠΎΠ²Π·Π°ΡŽΡ‡ΠΎΠ³ΠΎ Ρ„Ρ€Π΅ΠΉΠΌΠ° Ρƒ частотній області. Алгоритми Π·Π°Π±Π΅Π·ΠΏΠ΅Ρ‡ΡƒΡŽΡ‚ΡŒ ΠΌΡ–Π½Ρ–ΠΌΡ–Π·Π°Ρ†Ρ–ΡŽ ΡΠΏΠΎΡ‚Π²ΠΎΡ€Π΅Π½ΡŒ сигналу, виявлСння Ρ– дСкодування Π¦Π’Π— Π² асинхронному Ρ€Π΅ΠΆΠΈΠΌΡ– Π±Π΅Π· використання яких-Π½Π΅Π±ΡƒΠ΄ΡŒ ΠΌΠ°Ρ€ΠΊΠ΅Ρ€Ρ–Π² Ρ– синхросигналів. Для забСзпСчСння завадостійкості Π¦Π’Π— застосована Π²ΡƒΠ·ΡŒΠΊΠΎΡΠΌΡƒΠ³ΠΎΠ²Π° Π±Π°Π³Π°Ρ‚ΠΎΠΊΠ°Π½Π°Π»ΡŒΠ½Π° ΠΏΠ΅Ρ€Π΅Π΄Π°Ρ‡Π° Ρ– завадостійкС кодування.Introduction. Digital watermarks (DWM) refer to embedding additional information directly into audio signal for digital right management and automatic identification of radiotelephone transmissions in aeronautical, maritime and military VHF communication. The main part. The designed embedding algorithm is based on evaluation of sliding frame to embed information or no regarding to distortions introduced by DWM. Watermark location is grounded calculation of distances norm between received and maximum likelihood estimated signal vectors in the domain of Discreet Fourier Transform and doesn’t need for any marking and synchronizing measures. Robustness of DWM against quantization, filtering, additive Gaussian noise, digital format conversion is provided by multichannel narrowband DWM transmission and application of BCH (63,30,6) error-correction code. The proposed algorithm demonstrates watermark inaudibility because of preserving signal power before and after data embedding and searching the most suitable frames for DWM positioning. Conclusion. The proposed algorithms provide advanced compromising solution of audio watermarking process: data payload – inaudibility – robustness. The designed algorithms are applicable both in analog and digital channels for transmission monitoring and digital right management.Π Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½Ρ‹ Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΡ‹ встраивания ΠΈ обнаруТСния Ρ†ΠΈΡ„Ρ€ΠΎΠ²Ρ‹Ρ… водяных Π·Π½Π°ΠΊΠΎΠ² Π² Π·Π²ΡƒΠΊΠΎΠ²Ρ‹Π΅ сигналы Π½Π° основС Π°Π½Π°Π»ΠΈΠ·Π° ΡΠΊΠΎΠ»ΡŒΠ·ΡΡ‰Π΅Π³ΠΎ Ρ„Ρ€Π΅ΠΉΠΌΠ° Π² частотной области. Алгоритмы ΠΎΠ±Π΅ΡΠΏΠ΅Ρ‡ΠΈΠ²Π°ΡŽΡ‚ ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°Ρ†ΠΈΡŽ искаТСний сигнала, ΠΎΠ±Π½Π°Ρ€ΡƒΠΆΠ΅Π½ΠΈΠ΅ ΠΈ Π΄Π΅ΠΊΠΎΠ΄ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅ Π¦Π’Π— Π² асинхронном Ρ€Π΅ΠΆΠΈΠΌΠ΅ Π±Π΅Π· использования ΠΊΠ°ΠΊΠΈΡ…-Π»ΠΈΠ±ΠΎ ΠΌΠ°Ρ€ΠΊΠ΅Ρ€ΠΎΠ² ΠΈ синхросигналов. Для обСспСчСния помСхоустойчивости Π¦Π’Π— ΠΏΡ€ΠΈΠΌΠ΅Π½Π΅Π½Π° узкополосная многоканальная ΠΏΠ΅Ρ€Π΅Π΄Π°Ρ‡Π° ΠΈ помСхоустойчивоС ΠΊΠΎΠ΄ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅
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