Tài liệu 40 MPEG Digital Audio Coding Standards pdf

... LLCMPEGDigitalAudioCoding Standards PeterNollTechnicalUniversityofBerlin 40. 1Introduction 40. 2KeyTechnologiesinAudioCodingAuditoryMaskingandPerceptualCoding•FrequencyDomain Coding •WindowSwitching•DynamicBitAllocation 40. 3MPEG- 1/AudioCodingTheBasics•LayersIandII•LayerIII•FrameandMultiplexStructure•SubjectiveQuality 40. 4MPEG- 2/AudioMultichannelCoding MPEG- 2/AudioMultichannelCoding•Backward-Compat-ible(BC )MPEG- 2/AudioCoding•Advanced /MPEG- 2 /Audio Coding( AAC)•SimulcastTransmission•SubjectiveTests 40. 5MPEG- 4/AudioCoding 40. 6Applications 40. 7ConclusionsReferences 40. 1 ... frequency domain coders. MPEG/ Audiocodingalgorithms, described indetail inthe nextsection, makeuseof the abovekeytechnologies. 40. 3 MPEG- 1 /Audio Coding TheMPEG-1/Audiocoding standard [8],[28]–[30] ... LLCMPEGDigitalAudioCoding Standards PeterNollTechnicalUniversityofBerlin 40. 1Introduction 40. 2KeyTechnologiesinAudioCodingAuditoryMaskingandPerceptualCoding•FrequencyDomain Coding •WindowSwitching•DynamicBitAllocation 40. 3MPEG- 1/AudioCodingTheBasics•LayersIandII•LayerIII•FrameandMultiplexStructure•SubjectiveQuality 40. 4MPEG- 2/AudioMultichannelCoding MPEG- 2/AudioMultichannelCoding•Backward-Compat-ible(BC )MPEG- 2/AudioCoding•Advanced /MPEG- 2 /Audio Coding( AAC)•SimulcastTransmission•SubjectiveTests 40. 5MPEG- 4/AudioCoding 40. 6Applications 40. 7ConclusionsReferences 40. 1...

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... dB SPL for 400 -Hz tone). Three curves are shown, for 400 -Hzmaskers at 40, 60, and 80 dB SPL.Masking is greatest for probe frequencies slightly above or below the masker frequency of 400 Hz.Maximumprobe-to-masker ... dB SPL masker, and −14 dB for a 40 dB SPL masker.Masking decreases as probe frequency gets closer to 400 Hz. The probe frequencies closest to 400 Hz are 397 and 403 Hz, and at these frequencies ... Moore,B.C.J.andGlasberg,B.R.,Suggestedformulaeforcalculatingauditory-filterbandwidthsand excitation patterns,J. Acoust. Soc. Am., 74: 750-757, 1983b.[27] Noll, P., MPEG/ Audio coding standards. [28] Reynolds, G.S. and Stevens, S.S., Binaural summation of loudness,J. Acoust....

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... industries.The audio technology used in the ATSC digital audio compression standard [1] is Dolby AC-3.Dolby AC-3 is an audio compression technology capable of encoding a range of audio channelformats ... as defined previously. For each of 50c1999 by CRC Press LLCDavidson, G.A. Digital Audio Coding: Dolby AC-3” Digital Signal Processing HandbookEd. Vijay K. Madisetti and Douglas B. WilliamsBoca ... Todd, C. and Vernon, S., AC-2 and AC-3:Low-complexity transform-based audio coding, AES PublicationCollected Papers on Digital Audio Bit Rate Reduction,Neil Gilchrist and Christer Grewin, Eds.,...

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