Backward pitch prediction for low-delay speech coding

Pettigrew, R.; Cuperman, V.

doi:10.1109/glocom.1989.64154

Cited by 26 publications

(15 citation statements)

References 5 publications

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“…A thorough review and analysis of various structures for pitch prediction filters is available in [18]. Backward adaptive parameter estimation was proposed in [19] for low-delay speech coding, but forward adaption was found to be advantageous in [20]. Different techniques to efficiently transmit the filter information were proposed in [21] and [22].…”

Section: Long Term Predictionmentioning

confidence: 99%

“…For a given , to estimate the th filter parameters, , we fix all other filters and define the partial filter (19) and the corresponding residue (20) We next optimize the parameters of the th filter for the residue . This boils down to the classic LTP problem, where for a given the are given by (21) where the correlation values are (22) where, are the limits of summations that depend on the length of the available history and the length of the current frame.…”

Section: Basic Cltp Parameter Estimationmentioning

confidence: 99%

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Cascaded Long Term Prediction for Enhanced Compression of Polyphonic Audio Signals

Nanjundaswamy

Rose

2014

IEEE/ACM Trans. Audio Speech Lang. Process.

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Abstract-Audio compression systems exploit periodicity in signals to remove inter-frame redundancies via the long term prediction (LTP) tool. This simple tool capitalizes on the periodic component of the waveform by selecting a past segment as the basis for prediction of the current frame. However, most audio signals are polyphonic in nature, containing a mixture of several periodic components. While such polyphonic signals may themselves be periodic with overall period equaling the least common multiple of the individual component periods, the signal rarely remains sufficiently stationary over the extended period, rendering the LTP tool suboptimal. Instead of seeking a past segment that represents a "compromise" for incompatible component periods, we propose a more complex filter that predicts every periodic component of the signal from its immediate history, and this is achieved by cascading LTP filters, each corresponding to individual periodic component. We also propose a recursive "divide and conquer" technique to estimate parameters of all the LTP filters. We then demonstrate the effectiveness of cascaded LTP in two distinct settings of the ultra low delay Bluetooth Subband Codec and the MPEG Advanced Audio Coding (AAC) standard. In MPEG AAC, we specifically adapt the cascaded LTP parameter estimation to take into account the perceptual distortion criteria, and also propose a low decoder complexity variant. Objective and subjective results for all the settings validate the effectiveness of the proposal on a variety of polyphonic signals.

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Section: Long Term Predictionmentioning

confidence: 99%

Section: Basic Cltp Parameter Estimationmentioning

confidence: 99%

Cascaded Long Term Prediction for Enhanced Compression of Polyphonic Audio Signals

Nanjundaswamy

Rose

2014

IEEE/ACM Trans. Audio Speech Lang. Process.

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“…(7) (8) and As shown in Figure 3, the input of the all-pole formant lattice filter is equal to the output of the pitch predictor, w(n), that is,…”

Section: (6)mentioning

confidence: 99%

“…A robust long-term predictor for the LD-VXC configuration was introduced in [8]. In the LD-VXC long-term predictor, the coefficients are adapted sample-bysample using a backward adaptive recursive algorithm based on the stochastic gradient approach.…”

Section: System Overviewmentioning

confidence: 99%