Jerry D. Gibson, Victor Paul Berglund, L. Sauter,
... a high-performance adaptive differential pulse code modulation (ADPCM) system for operation at data rates of 12- ... The Kalman/MPCQ system is compared to an ADPCM system using a Kalman algorithm and robust Jayant ... on backward adaptive prediction are eliminated by simple ADPCM system modifications that do not affect the SNR ... LPC processed speech as input to the three ADPCM systems and by using the output of the three ADPCM systems as input to an LPC analysis algorithm. For the LPC to ADPCM connection, the two systems with the MPCQ produce ...
Tópico(s): Inertial Sensor and Navigation
1980 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
A simple and universal PCM/ADPCM transcoding algorithm, which does not accumulate distortion in multiple code conversions between PCM and ADPCM, has been derived by thoroughly investigating the PCM-ADPCM-PCM code conversion process. Conditions to avoid distortion ... are clarified by newly introduced mathematical expressions for ADPCM and PCM quantization processes. These expressions can be ... be realized by adding some functions to the ADPCM decoder output portion. This distortion reduction technique is ...
Tópico(s): Error Correcting Code Techniques
1986 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
... on explicit coding of the reconstruction noise in ADPCM (differential pulse code modulation with adaptive quantization). If the ADPCM bit rate is R bits/sample, PCM coding ... with that of conventional (R + R n )-bit ADPCM. If noise coding is based on instantaneous R ... ratio performance is comparable to that of conventional ADPCM for R n = 1, but it deteriorates significantly ... coding, the performance can exceed that of conventional ADPCM for any R n > 1, if R > 2. ... as a way of improving the performance of ADPCM coding at a single bit rate of R + ...
Tópico(s): Wireless Communication Networks Research
1983 - Institute of Electrical and Electronics Engineers | Bell System Technical Journal
S. Kubota, A. Dobashi, Masanobu Suzuki, T. Hasumi, Shuzo Kato,
... essential requirements, and adaptive differential pulse-code modulation (ADPCM) codecs are one of the voice codec candidates ... fading environments, burst errors induce click noise in ADPCM voice signal transmission. This paper proposes a novel error-concealment scheme to improve the ADPCM voice signal transmission quality of time division multiple ... simulation results show that these techniques significantly improve ADPCM voice signal transmission quality by 0.5 points ... 1.0 compared to that of the conventional ADPCM muting scheme and no processing, respectively, with the ...
Tópico(s): Wireless Communication Networks Research
1997 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Vehicular Technology
Masahiro Taka, R. Maruta, Alain Le Guyader,
... property of nonaccumulation of distortion in tandem-connected ADPCM coders with a 64 kbit/s PCM interface ... the synchronous tandem property is realized in an ADPCM coder. A 32 kbit/s ADPCM coder utilizing this algorithm has been standardized by ... synchronous tandem property of the 32 kbit/s ADPCM coder is of great interest in network applications, because the ADPCM coder appears likely to be introduced into digital ...
Tópico(s): Wireless Communication Networks Research
1985 - IEEE Communications Society | IEEE Transactions on Communications
... which digital speech interpolation (DSI) is combined with ADPCM encoding. A highly sensitive speech detector, a voiceband data discriminator, and a variable rate ADPCM encoding are used to achieve a high compression ... bit length from 2 to 4 in an ADPCM speech encoder. Voiceband data are detected with 10 ms by the voiceband data discriminator. 5 bit ADPCM encoding is applied to voiceband data to maintain transparency through the DSI-ADPCM system. A DSI gain of 3 is expected ... and voiceband data are efficiently transmitted through an ADPCM encoding with either a 6 or 6.4 ...
Tópico(s): Speech Recognition and Synthesis
1982 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
Shunpan Yuan, Haibo Wang, Xiaoyi Li, Zongliang Du, Xu Cheng, Xiaosheng Du,
... form-stable and flame-retardant phase change composites (ADPCMs) were fabricated by impregnating n-eicosane into APDWs ... eicosane. Differential scanning calorimetry (DSC) analysis indicated that ADPCMs possessed an extremely high thermal storage density (202. ... and storage efficiency (up to 90.5%) of ADPCMs. Moreover, with the increasing content of phytic acid ( ... rate (pHRR) and total heat release (THR) of ADPCMs decreased significantly, revealing the improved flame retardancy of ADPCMs. Biosourced functional composites show considerable potential for application ...
Tópico(s): Polymer composites and self-healing
2022 - Elsevier BV | Composites Part A Applied Science and Manufacturing
Muhanned AL-Rawi, Muaayed AL-Rawi,
... with the performance of standard 32 kb/s ADPCM. This performance is measured using signal-tonoise ratio ( ... with mathematical derivation of SNR for asynchronous tandem ADPCM systems as given in section 5. Another contribution ... 8) circular. The results of testing asynchronous tandem ADPCM systems show that the performance degrades with increasing the stages of ADPCM. Also, the results show that the performance with ...
Tópico(s): Advanced Data Compression Techniques
2011 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Mostafa Hashem Sherif, Duane O. Bowker, G. Bertocci, B.A. Orford, Georges Mariano,
Embedded adaptive differential pulse coded modulation (ADPCM) algorithms quantize the differences between the input signal and the estimated signal into core bits and enhancement bits. CCITT Recommendation G.727, which describes embedded ADPCM encoding algorithms with 5, 4, 3, and 2 ... subjective evaluation of the speech performance of embedded ADPCM algorithms indicates that a midrise quantizer provides better ... the performance of the 40-kb/s midrise ADPCM algorithm with two feedback bits is indistinguishable from ...
Tópico(s): Advanced Wireless Communication Techniques
1993 - IEEE Communications Society | IEEE Transactions on Communications
Tomohiko Taniguchi, S. Unagami, K. Iseda, S. Tominaga,
... processing delay is introduced. The proposed algorithm is ADPCM (adaptive digital pulse code modulation) with a multiquantizer (ADPCM-MQ). The input signal is processed in parallel by multiple ADPCM coders with different characteristics. Then the optimum ADPCM coder with minimum error power is dynamically selected ...
Tópico(s): Digital Filter Design and Implementation
1988 - Institute of Electrical and Electronics Engineers | IEEE Journal on Selected Areas in Communications
N. Benvenuto, G. Bertocci, W. Daumer, Duncan Sparrell,
... 32-kb/s adaptive differential pulse code modulation (ADPCM). This paper highlights the process leading to the standards on 32-kb/s ADPCM recognized by the American National Standards Institute (ANSI) ... It concludes with a discussion of applications of ADPCM and the AT&T products and services that utilize ADPCM.
Tópico(s): Advanced Data Compression Techniques
1986 - Institute of Electrical and Electronics Engineers | AT&T Technical Journal
R. Reininger, Jerry D. Gibson,
... use in an adaptive differential pulse code modulation (ADPCM) system for coding speech at 16 kilobits/second ( ... of 10 -2 . To extend the performance of ADPCM with a least squares lattice predictor down to ... a selective coding scheme is devised. The resulting ADPCM system maintains excellent performance through a BER of ... performance, and behavior for noisy inputs for the ADPCM system and CVSD are investigated.
Tópico(s): Target Tracking and Data Fusion in Sensor Networks
1985 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
... Single encodings of μ255 PCM, adaptive differential PCM (ADPCM), subband coding (SBC), vocoder-driven adaptive transform coding ( ... modest complexity 32 kbit/s coders such as ADPCM and SBC and more complex 24 kbit/s ... 64 kbit/s μ255 PCM, 32 kbit/s ADPCM, 16 kbit/s SBC, and 16 kbit/s ... exception of synchronous tandeming of 32 kbit/s ADPCM with 64 kbit/s PCM where several encodings ... to a single encoding of 32 kbit/s ADPCM.
Tópico(s): Speech and Audio Processing
1982 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
... the quantization error. Quantizing noise in adaptive DPCM (ADPCM) systems falls into three categories: granularity, slope overload, ... for the three types of quantizing noise in ADPCM systems are derived, and computer simulations are perforated. ... well with theoretical predictions. Comparisons indicate that the ADPCM can perform better than the best analogous nonadaptive ... ratio. Furthermore, the optimal operating point for the ADPCM is much less sensitive to changes in input ...
Tópico(s): Error Correcting Code Techniques
1977 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
... Wavelet Transform (DWT), Adaptive Differential Pulse Code Modulation (ADPCM), and Run-Length Coding (RLC). The ACT first ... domain, reduces the range of data by using ADPCM, and then reduces the number of packets with ... groups and defines the quantization step size of ADPCM in an inverse proportion to the priorities. RLC ... packets by increasing the quantization step size of ADPCM in case of congestion. Moreover, in order to ...
Tópico(s): Network Traffic and Congestion Control
2010 - Multidisciplinary Digital Publishing Institute | Sensors
Kevin W. Gould, R.V. Cox, N. Jayant, Melvin J. Melchner,
... the CCITT standard, adaptive differential pulse code modulation (ADPCM). 1 These alternative coders are designed to minimize ... The coders compared are CCITT standard G.721 ADPCM, adaptive sub-band coding, and two other non-standard versions of ADPCM. In general, when packets of data are lost, ... greatest levels of complexity and delay. The other ADPCM systems offer lower complexity and delay — at the ...
Tópico(s): Wireless Communication Networks Research
1993 - Institute of Electrical and Electronics Engineers | AT&T Technical Journal
Eric Richardson, N. S. Jayant,
... subband (SBC-APCM); DPCM with backward adaptive prediction (ADPCM); and, most importantly, the combination of the two techniques, SBC-ADPCM. The main conclusion of this paper is that SBC-ADPCM, with a fourth-order backward adaptive predictor in ... pole 6-zero predictor. In the full-band ADPCM coder, however, the 8-pole predictor was significantly ...
Tópico(s): Advanced Data Compression Techniques
1986 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Acoustics Speech and Signal Processing
Adaptive Differential Pulse Code Modulation (ADPCM) systems can provide high-quality digitizations of telephone-bandwidth speech at a bit rate of 32 kb/s. At a lower ... significantly enhance the quality of lower bit rate ADPCM. The coefficients of the postfilter are easily derivable from the predictor coefficients in the ADPCM decoder. In a subjective test involving 18 listeners ...
Tópico(s): Advanced Wireless Communication Techniques
1984 - Institute of Electrical and Electronics Engineers | AT&T Bell Laboratories Technical Journal
... modulation (PCM) references and four adaptive differential PCM (ADPCM) test circuits, with bit rates between 16 and ... was estimation of the quality of the 16 ADPCM conditions at location B , given measurements of ADPCM quality at location A and knowledge of reference- ... data indicate that a reasonably accurate estimate of ADPCM quality at location B is the quality measured ...
Tópico(s): Speech Recognition and Synthesis
1982 - IEEE Communications Society | IEEE Transactions on Communications
W. Daumer, James R. Cavanaugh,
... NIC PCM), Cummiskey-Jayant-Flanagan Adaptive Differential PCM (ADPCM), and Subscriber Loop Carrier Adaptive Delta Modulation (SLC∗ ... tests. It is shown that (i) NIC PCM, ADPCM, and SLC ADM have approximately a 12- to ... PCM for equivalent subjective ratings, (ii) NIC PCM, ADPCM, and SLC ADM perform comparably over the range ... the use of lower bit rate NIC PCM, ADPCM, and SLC ADM codecs would necessitate more stringent ...
Tópico(s): Advanced Wireless Communication Techniques
1978 - Institute of Electrical and Electronics Engineers | Bell System Technical Journal
... stability of an adaptive differential pulse code modulation (ADPCM) system is considered from two viewpoints. First, it ... size adaptation algorithm of a certain class of ADPCM's can be characterized by the system's ... densities are used to study stochastic stability of ADPCM. It is shown that for certain ADPCM's the time-averaged mean-absolute quantizing noise ...
Tópico(s): Wireless Communication Networks Research
1977 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Information Theory
... signals modulated by adaptive differential pulse-code modulators (ADPCM) and adaptive delta modulators (ADM). A technique for ... FFT) implementation is then described that uses an ADPCM signal as input and accomplishes the necessary code ... RC-filtered Gaussian signals modulated by ADM and ADPCM systems are used to provide some insight into ...
Tópico(s): Advanced Adaptive Filtering Techniques
1977 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Acoustics Speech and Signal Processing
David L. Cohn, James L. Melsa,
... speech digitization using adaptive differential pulse-code modulation (ADPCM) is described. The system uses an adaptive predictor, ... increase in signal-to-noise ratio over previous ADPCM. The increase can be used to improve speech ... complexity is on the same order as other ADPCM systems.
Tópico(s): Advanced Adaptive Filtering Techniques
1975 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
P. Cummiskey, N. Jayant, James L. Flanagan,
We describe an adaptive differential PCM (ADPCM) coder which makes instantaneous exponential changes of quantizer step-size. The coder includes a simple first-order predictor and a time-invariant, ... Gauss-Markov inputs. We compare performance of the ADPCM coder with conventional log-PCM, using both objective ... describe an economical integrated hardware implementation of the ADPCM coder. We believe that at bit rates of 24 to 32 kb/s, ADPCM provides a robust and efficient technique for speech ...
Tópico(s): Algorithms and Data Compression
1973 - Institute of Electrical and Electronics Engineers | Bell System Technical Journal
K. Hosoda, Osamu Noguchi, Y. Yatsuzuka,
... is given of an advanced 32-kb/s ADPCM (adaptive digital pulse code modulation) algorithm and its ... equivalent to that of the CCITT G.721 ADPCM and is capable of transmitting V.23 1200 ...
Tópico(s): Advanced Wireless Communication Techniques
1988 - Institute of Electrical and Electronics Engineers | IEEE Journal on Selected Areas in Communications
V. Ramamoorthy, N. Jayant, R.V. Cox, M. M. Sondhi,
... on the backward-adaptive pole-zero predictor in ADPCM (adaptive digital pulse code modulation). Quantitative criteria for ... a computer-simulated version of these circuits, enhanced ADPCM obtained a mean opinion score of 3.6 ...
Tópico(s): Advanced Adaptive Filtering Techniques
1988 - Institute of Electrical and Electronics Engineers | IEEE Journal on Selected Areas in Communications
T. Nishitani, I. Kuroda, Motonobu Satoh, Takuya Katoh, Yasushi Aoki,
An LSI ADPCM codec, which is based on the CCITT standard 32 kbit/s algorithm, has been developed. After thoroughly investigating ... to perform efficient binary tree search processing for ADPCM quantization, in addition to performing parallel processing in ...
Tópico(s): Numerical Methods and Algorithms
1987 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Acoustics Speech and Signal Processing
J.-M. Raulin, G. Bonnerot, J.-L. Jeandot, R. Lacroix,
... of the conventional 64 kbit/s rate. The ADPCM technique described in this paper features a simple ... achieved. The implementation is a 60 channel PCM-ADPCM converter, called TMN 162. It is a fully ...
Tópico(s): Control Systems and Identification
1982 - Institute of Electrical and Electronics Engineers | IRE Transactions on Communications Systems
... of IIR quadrature mirror filters and forward adapting ADPCM with optimum quantizers for octave band subband coders ... be obtained using optimum quantizers for forward adapting ADPCM coders over linear quantizers in backward adapting APCM ...
Tópico(s): Digital Filter Design and Implementation
1982 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Acoustics Speech and Signal Processing
S. Townes, K. Kou, J.P. Agrawal, J. O'Neal, D. Mobedjina,
... adaptive differential PCM with time assignment speech interpolation (ADPCM/ TASI). This system is used to compress the ... a number of different input power levels. The ADPCM/TASI system was constructed by using an AMD ...
Tópico(s): Advanced Adaptive Filtering Techniques
1981 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Acoustics Speech and Signal Processing