It is possible to create an integer version of any transform where the transform matrix can be expressed as a product of matrices that have ones in the diagonal and all other elements are zero except in either one row or column.Integer-to-Integer Modified Discrete Cosine Transform (INTMDCT) is similar to MDCT but if the input is integers then the output is integers too.Modified Discrete Cosine Transform (MDCT) is the most popular audio coding transform, but losslessly coding floating point values is difficult.Lossy coding is important, but how could you extend that to lossless coding?.Integer-to-Integer Modified Discrete Cosine Transform (INTMDCT) BCC doesn’t suffer from unmasking effects since the quantization noise is automatically rendered to the same direction as the source.BCC is based on the assumption that on every critical band the dominant source defines the spatial perception.Parameters are applied on critical bands.BCC can also be used as parametric stereo.This increases the bitrate and limits rendering options in the decoder, but also improves quality. In natural rendering one parameterised stream of spatial information is created for each of the original channels.The decoder can also apply Head Related Transfer Functions (HRTF’s) to create surround headphone playback.
The decoder then renders as many channels as are needed based on the parameterised spatial image. In flexible rendering the original multichannel input is downmixed to (usually) one channel and the spatial information is sent as one separate low bitrate parametric stream.Binaural Cue Coding (BCC) has two versions: flexible rendering and natural rendering.Without specific matrixing, traditional multichannel coding is restricted to a certain number of channels e.g.Traditional multichannel coding requires “the number of channels” x “mono bitrate” kbps.(Juha Ojanperä, Miikka Vilermo)Įxample of the time/frequency grid of the SBR.(Juha Ojanperä, Miikka Vilermo) (Juha Ojanperä)īlock diagram of the SBR encoder module combined with AAC core encoder. High-level block diagram of the SBR incorporated to an audio encoder (a) and audio decoder (b). SBR has been standardized as High Efficiency Advanced Audio Coding (HE-AAC).Achieves very high quality 48 kbps stereo.The technology is applicable to any coder.SBR was introduced by Coding Technologies.BWE is a class of methods to increase the perceived bandwidth without using many bits.SBR is one method of Bandwidth Extension (BWE).Integer-to-Integer Modified Discrete Cosine Transform (INTMDCT).One case closed and another reopened (if time).Important issues outside today’s presentation.How good is good enough? – Codec requirements.Will the emerging technologies change the ”status quo”?.Codecs evolve and new technologies emerge.Award-winning technology, recommended by doctors.Audio Codecs Miikka Vilermo Nokia Research Center – Audio Visual Systems Laboratory.Can be worn during car rides, sea rides, while on a plane (TSA compliant) carnival rides, while playing Video Games, watching Action movies, or during anything that triggers your motion sickness.These glasses ease seasickness and motion sickness in a matter of minutes without posing the tiring side effects of medicines and herbal cures.Plan sea excursion, cruise vacation or road trip without fear of dreading nausea, dizziness, and vertigo.NO Side Effects – Safe for Elderly, Children, Pregnant Women.Designed & Developed to Offer a Safer, Healthier Alternative.FDA Approved liquid that simulates the horizon.Healthy, Risk-Free & Fast-Acting Motion Sickness Glasses.THE BLUE LIQUID IN THE RING will flow with your bumps in the car, creating an artificial horizontal line on the front and side of your field of view.RELIEVES the vomiting, nausea, dizziness, anorexia in 10 minutes.One-size-fits-all and can be worn over prescription glasses The glasses are lensless, so they can be shared between all the family and traveling companions.This cures you of nausea for the rest of the journey.
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