Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 40, Issue 25, 9 December 2004
Volumes & issues:
-
Volume 59 (2023)
-
Volume 58 (2022)
-
Volume 57 (2021)
-
Volume 56 (2020)
-
Volume 55 (2019)
-
Volume 54 (2018)
-
Volume 53 (2017)
-
Volume 52 (2016)
-
Volume 51 (2015)
-
Volume 50 (2014)
-
Volume 49 (2013)
-
Volume 48 (2012)
-
Volume 47 (2011)
-
Volume 46 (2010)
-
Volume 45 (2009)
-
Volume 44 (2008)
-
Volume 43 (2007)
-
Volume 42 (2006)
-
Volume 41 (2005)
-
Volume 40 (2004)
-
Volume 39 (2003)
-
Volume 38 (2002)
-
Volume 37 (2001)
-
Volume 36 (2000)
-
Volume 35 (1999)
-
Volume 34 (1998)
-
Volume 33 (1997)
-
Volume 32 (1996)
-
Volume 31 (1995)
-
Volume 30 (1994)
-
Volume 29 (1993)
-
Volume 28 (1992)
-
Volume 27 (1991)
-
Volume 26 (1990)
-
Volume 25 (1989)
-
Volume 24 (1988)
-
Volume 23 (1987)
-
Volume 22 (1986)
-
Volume 21 (1985)
-
Volume 20 (1984)
-
Volume 19 (1983)
-
Volume 18 (1982)
-
Volume 17 (1981)
-
Volume 16 (1980)
-
Volume 15 (1979)
-
Volume 14 (1978)
-
Volume 13 (1977)
-
Volume 12 (1976)
-
Volume 11 (1975)
-
Volume 10 (1974)
-
Volume 9 (1973)
-
Volume 8 (1972)
-
Volume 7 (1971)
-
Volume 6 (1970)
-
Volume 5 (1969)
-
Volume 4 (1968)
-
Volume 3 (1967)
-
Volume 2 (1966)
-
Volume 1 (1965)
Volume 40, Issue 25
9 December 2004
-
- Author(s): J.A. Rodriguez ; A. Trastoy ; F. Ares ; E. Moreno
- Source: Electronics Letters, Volume 40, Issue 25, p. 1565 –1566
- DOI: 10.1049/el:20047233
- Type: Article
- + Show details - Hide details
-
p.
1565
–1566
(2)
The proposed quasi-analytical method undertakes the shaping of a desired footprint as a composition of several phis-symmetric circular Taylor patterns exhibiting flat-topped beams. The final pattern is obtained after sampling the obtained circular aperture for circular grid planar arrays. A square and a rectangular footprint pattern, both radiated by a planar array with 1246 elements, demonstrate the performance of the technique. - Author(s): Y. Kim ; Y. Noh ; H. Ling
- Source: Electronics Letters, Volume 40, Issue 25, p. 1566 –1568
- DOI: 10.1049/el:20046660
- Type: Article
- + Show details - Hide details
-
p.
1566
–1568
(3)
The design of a very simple, ultra-broadband, on-glass antenna for automobiles is described. A 250 Ω impedance system is proposed and a loop-based antenna structure with tuning arms is optimised by a genetic algorithm. The measured results on a prototype antenna show an average VSWR of 1.61 in the UHF and L bands. - Author(s): S.H. Hwang ; J.I. Moon ; W.I. Kwak ; S.O. Park
- Source: Electronics Letters, Volume 40, Issue 25, p. 1568 –1569
- DOI: 10.1049/el:20046579
- Type: Article
- + Show details - Hide details
-
p.
1568
–1569
(2)
A printed compact dipole antenna for dual ISM band (2.44 and 5 GHz) is presented. The proposed antenna fed by using a 50 Ω coaxial line occupies a volume of 15×40×1 mm3 (FR-4, permittivity 4.6). The impedance bandwidth for 10 dB return loss is about 400 MHz (from 2170 to 2570 MHz) at 2.4 GHz band and over 2300 MHz (from 4690 to beyond 7000 MHz) at 5 GHz band. The measured radiation gains range from 1.20 to 1.41 dBi at 2.4 GHz band and from 2.25 to 3. 44 dBi at 5 GHz band, respectively.
Arbitrary footprint patterns obtained by circular apertures
Design of ultra-broadband on-glass antenna with a 250 Ω system impedance for automobiles
Printed compact dual band antenna for 2.4 and 5 GHz ISM band applications
-
- Author(s): A. Tamaševičius ; S. Bumelienė ; E. Lindberg
- Source: Electronics Letters, Volume 40, Issue 25, p. 1569 –1570
- DOI: 10.1049/el:20047019
- Type: Article
- + Show details - Hide details
-
p.
1569
–1570
(2)
A novel version of the Colpitts oscillator is presented generating chaotic oscillations at gigahertz frequencies. In contrast to the standard oscillator the inductor is moved from the collector circuit of the transistor to the base circuit. PSpice simulations demonstrate chaos at the fundamental frequencies of 0.5, 1 and 2 GHz employing transistors with a threshold frequency of 9 GHz.
Improved chaotic Colpitts oscillator for ultrahigh frequencies
-
- Author(s): Y. Son ; K. Ryoo ; Y. Kim
- Source: Electronics Letters, Volume 40, Issue 25, p. 1570 –1572
- DOI: 10.1049/el:20046754
- Type: Article
- + Show details - Hide details
-
p.
1570
–1572
(3)
A new 1:4 interpolation FIR filter is presented. Using the symmetries of the filter coefficients and the contents of the lookup table (LUT), the two filters for in-phase (I-phase) and quadrature-phase (Q-phase) share the LUT and activate only the selected part of the LUT. Experimental results show that the proposed filter reduces the power consumption and the gate area by 28 and 5% compared to conventional filters. - Author(s): Z. Gu and A. Thiede
- Source: Electronics Letters, Volume 40, Issue 25, p. 1572 –1574
- DOI: 10.1049/el:20046728
- Type: Article
- + Show details - Hide details
-
p.
1572
–1574
(3)
The design of a fully monolithic integrated 10 GHz full-rate clock and data recovery (CDR) circuit in 0.18 µm digital CMOS technology, which employs an injection phase-locked loop technique is presented. The CDR operating without the external reference exhibits a capture range of 200 MHz while consuming 205 mA current from 1.8 V supply including the output buffer. The recovered clock signal with 250 mVpp pseudorandom bit sequence input data of length 231−1 exhibits 7.9 ps of peak-to-peak (p-p) and 1.1 ps of root-mean-square (rms) jitter. The measured clock phase noise at 1 MHz offset is approximately −109 dBc/Hz. - Author(s): Q. Yang and R. Zhou
- Source: Electronics Letters, Volume 40, Issue 25, p. 1574 –1575
- DOI: 10.1049/el:20046892
- Type: Article
- + Show details - Hide details
-
p.
1574
–1575
(2)
To diminish the trapped charges in internal nodes of the complex logic adiabatic gate, adiabatic differential voltage switch logic (ADVSL) using capacitance coupling technique is presented. An adiabatic system, based on a relatively small number of complex ADVSL gates, reduces not only dissipation loss, but also the gate count greatly. - Author(s): L. Hernández ; E. Prefasi ; P. Rombouts
- Source: Electronics Letters, Volume 40, Issue 25, p. 1575 –1576
- DOI: 10.1049/el:20046952
- Type: Article
- + Show details - Hide details
-
p.
1575
–1576
(2)
An implementation of a sixth-order bandpass continuous time sigma–delta modulator using transmission lines is presented. A single tuning coefficient allows the exchange of resolution and bandwidth in this modulator, owing to the use of a two path transformation that exploits the similarity between transmission line modulators and discrete time modulators. The modulator tolerates two clock cycles of excess loop delay and a high clock jitter.
1:4 interpolation FIR filter
10 GHz full-rate clock and data recovery circuit in 0.18 µm CMOS without external reference clock
Adiabatic differential voltage switch logic
Sixth-order programmable bandwidth bandpass sigma–delta modulator implemented with transmission lines
-
- Author(s): C. Chojetzki ; J. Ommer ; S. Grimm ; H. Bartelt
- Source: Electronics Letters, Volume 40, Issue 25, p. 1576 –1578
- DOI: 10.1049/el:20047193
- Type: Article
- + Show details - Hide details
-
p.
1576
–1578
(3)
Fibre Bragg gratings (FBGs) of a new IA type have been reported to show thermal behaviour that is different from that of conventional type I gratings. Given a sufficiently large temperature coefficient difference between the two grating types, a dual-grating sensor formed by both types of gratings could allow simultaneous temperature and strain measurement. Such dual-grating sensors were prepared for the 830 nm wavelength region and tested at temperatures of up to 300°C. As far as the variation of the different temperature coefficients is concerned, the temperature coefficient of type IA FBGs and the temperature coefficient of type I FBGs have been found to converge as the temperature increases. The difference in temperature coefficients drops to 1% after annealing at 300°C. - Author(s): T. Luo ; L.-S. Yan ; Y.Q. Shi ; Z. Pan ; Y.W. Song ; A.E. Willner ; S. Yao
- Source: Electronics Letters, Volume 40, Issue 25, p. 1578 –1579
- DOI: 10.1049/el:20047181
- Type: Article
- + Show details - Hide details
-
p.
1578
–1579
(2)
A multi-wavelength fibre laser whose channel spacing can be dynamically and continuously tuned is demonstrated experimentally. A novel programmable magneto-optic-based DGD module is used as the intra-cavity optical filter to control the wavelength spacing. Channel spacing tunable from 0.4 to 1.6 nm is achieved.
Temperature dependence of type I-IA dual-fibre Bragg gratings
Tunable wavelength spacing multi-wavelength ring laser using programmable DGD module as intra-cavity filter
-
- Author(s): Z. Liang and P. Shi
- Source: Electronics Letters, Volume 40, Issue 25, p. 1579 –1581
- DOI: 10.1049/el:20046702
- Type: Article
- + Show details - Hide details
-
p.
1579
–1581
(3)
An efficient algorithm for kernel discriminant analysis is developed, which applies the maximal Fisher criterion value and the minimal statistical correlation between feature vectors. In some sense, the proposed algorithm is a generalisation of Xu's method as a nonlinear feature extraction method. Experiments on ORL face database demonstrate that the proposed algorithm is effective. - Author(s): J.-G. Kim ; J.-S. Kim ; H.-M. Kim
- Source: Electronics Letters, Volume 40, Issue 25, p. 1581 –1583
- DOI: 10.1049/el:20046596
- Type: Article
- + Show details - Hide details
-
p.
1581
–1583
(3)
A simple estimation method of the distortion caused by the discrete cosine transform (DCT) coefficient dropping for rate adaptation is presented. The proposed method is based on the investigation of statistical and empirical properties of the distortion, and then modelled in a monotonically decreased manner. It is expected that the method can be employed to allocate effectively the distortion among frames in coefficient drop transcoding applications. - Author(s): M.-R. Zhang ; G.-C. Shao ; K.-C. Yi
- Source: Electronics Letters, Volume 40, Issue 25, p. 1583 –1584
- DOI: 10.1049/el:20046517
- Type: Article
- + Show details - Hide details
-
p.
1583
–1584
(2)
A T-matrix used for image scrambling is proposed and its periodicity is proved. The T-matrix has a simple conformation and a period twice as long as the Arnold matrix. It can be applied to image encryption and pre-processing in image processing such as image watermarking algorithms. Two examples of applications are given.
Efficient algorithm for kernel discriminant analysis
Simple method for estimating distortion caused by DCT coefficient drop in compressed domain
T-matrix and its applications in image processing
-
- Author(s): J. Czarske ; J. Möbius ; K. Moldenhauer ; W. Ertmer
- Source: Electronics Letters, Volume 40, Issue 25, p. 1584 –1586
- DOI: 10.1049/el:20046843
- Type: Article
- + Show details - Hide details
-
p.
1584
–1586
(3)
A novel optical sensor for absolute position measurements of rough surfaces is presented. The technical surface acts as reflector of an external cavity for an antireflection-coated laser diode. Evaluation of the resulting mode spacing determines the laser cavity length, i.e. the distance to the rough surface. Modelocking by synchronous pumping of the laser diode allows highly-resolved measurements with position resolution of 5 µm and temporal resolution of 200 µs. - Author(s): O. Malis ; A. Belyanin ; D.L. Sivco ; J. Chen ; A.M. Sergent ; C. Gmachl ; A.Y. Cho
- Source: Electronics Letters, Volume 40, Issue 25, p. 1586 –1587
- DOI: 10.1049/el:20047040
- Type: Article
- + Show details - Hide details
-
p.
1586
–1587
(2)
Milliwatt second harmonic power at 4.45 µm was achieved in InP lattice-matched quantum cascade lasers with monolithically-integrated resonant nonlinear cascades and modal phase matching. The use of an InP top-cladding layer and high-reflectance coating on the laser back facet enabled high linear laser power and consequently record nonlinear power.
External cavity laser sensor using synchronously-pumped laser diode for position measurements of rough surfaces
Milliwatt second harmonic generation in quantum cascade lasers with modal phase matching
-
- Author(s): B. Carey-Smith and P.A. Warr
- Source: Electronics Letters, Volume 40, Issue 25, p. 1587 –1589
- DOI: 10.1049/el:20047069
- Type: Article
- + Show details - Hide details
-
p.
1587
–1589
(3)
The design and experimental performance of a bandstop filter which combines both continuous and discrete tuning using varactor and PIN diodes to achieve a two-octave tuning range is reported. The topology allows independent control of the passband and stopband frequencies.
Broadband configurable bandstop filter with composite tuning mechanism
-
- Author(s): S.-H. Hwang and L. Hanzo
- Source: Electronics Letters, Volume 40, Issue 25, p. 1589 –1591
- DOI: 10.1049/el:20046802
- Type: Article
- + Show details - Hide details
-
p.
1589
–1591
(3)
The effect of the maximum asynchronous arrival time difference (AATD) of the delayed multipath components on the uplink performance of synchronous DS-CDMA systems is investigated, when communicating in a frequency-selective Rayleigh fading channel. Numerical results demonstrate that the achievable user capacity gain may be as high as 64% at a bit error rate of 10−2, when the maximum AATD is sufficiently low. - Author(s): Z. Fan
- Source: Electronics Letters, Volume 40, Issue 25, p. 1591 –1592
- DOI: 10.1049/el:20046622
- Type: Article
- + Show details - Hide details
-
p.
1591
–1592
(2)
A reactive routing algorithm for multi-rate ad hoc wireless networks is proposed. It enhances the AODV protocol and achieves higher throughput by utilising the multi-rate capability of the underlying wireless channel via the MAC delay routing metric. Simulations show that the protocol leads to a significant throughput increase over traditional ad hoc routing protocols. - Author(s): M. Ghaddar ; L. Talbi ; T.A. Denidni
- Source: Electronics Letters, Volume 40, Issue 25, p. 1592 –1594
- DOI: 10.1049/el:20046730
- Type: Article
- + Show details - Hide details
-
p.
1592
–1594
(3)
The main objective of this study was to demonstrate that the human body may be approximated by a uniform geometrical shape. A perfect conducting circular cylinder of radius of 0.25 m was reasonably considered to be the closest form of substitute for the human body in human effect investigations. To validate the model, continuous-wave measurements were performed at 10 GHz between two fixed terminals in an empty room along with the presence of an obstacle (human body or cylinder) moving in predetermined parallel and perpendicularly crossing paths with respect to the direct line of sight. Results indicate that there is a strong correlation between the human body and a perfect conducting cylinder. The results obtained will be of great interest for ray-tracing techniques that involve a human motion within indoor propagation channel. - Author(s): D.-B. Lin ; R.-T. Juang ; H.-P. Lin
- Source: Electronics Letters, Volume 40, Issue 25, p. 1594 –1595
- DOI: 10.1049/el:20046663
- Type: Article
- + Show details - Hide details
-
p.
1594
–1595
(2)
A mobile location scheme using a weighted centroid method based on the ratios of distances between mobile and base stations derived from the differences of signal attenuations is proposed. The proposed method does not require perfect path loss and shadowing models, and is capable of being applied in existing systems without hardware modifications. Simulations demonstrate encouraging performance with only two base stations being available in shadowing environments. Additionally, the results of driving measurement show that the proposed method outperforms the Cell-ID method in a real GSM system. - Author(s): C. Li ; J. Li ; X. Cai
- Source: Electronics Letters, Volume 40, Issue 25, p. 1596 –1597
- DOI: 10.1049/el:20046588
- Type: Article
- + Show details - Hide details
-
p.
1596
–1597
(2)
A novel self-adaptive transmission scheme to support integrated data and voice transmission over an IEEE 802.11 WLAN is proposed. The simulation results show that the scheme can improve the data traffic performance and decrease efficiently the voice traffic delay jitter, and then increase the WLAN capacity. It is easy to realise as no change in the MAC protocol is required.
Effects of multipath propagation delay on uplink performance of synchronous DS-CDMA systems communicating in dispersive Rayleigh fading channels
High throughput reactive routing in multi-rate ad hoc networks
Human body modelling for prediction of effect of people on indoor propagation channel
Robust mobile location estimation based on signal attenuation for cellular communication systems
Self-adaptive transmission scheme of integrated services over an IEEE 802.11 WLAN
-
- Author(s): A. Sahara ; Y. Tsukishima ; K. Shimano ; M. Koga ; K. Mori ; Y. Sakai ; Y. Ishii ; M. Kawai
- Source: Electronics Letters, Volume 40, Issue 25, p. 1597 –1599
- DOI: 10.1049/el:20046634
- Type: Article
- + Show details - Hide details
-
p.
1597
–1599
(3)
The first demonstration of a connection-oriented optical burst data switching network constructed with PLC and MEMS switches employing GMPLS control is reported. Optical burst data switching in a six-node photonic network using the general switch management protocol (GSMP) is successfully, demonstrated. - Author(s): J.W. Raring ; E.J. Skogen ; S.P. DenBaars ; L.A. Coldren
- Source: Electronics Letters, Volume 40, Issue 25, p. 1599 –1600
- DOI: 10.1049/el:20047306
- Type: Article
- + Show details - Hide details
-
p.
1599
–1600
(2)
For the first time negative large signal chirp characteristics from a widely-tunable laser/electroabsorption modulator transmitter are reported. This device employed an intermixed quantum well absorption region in the modulator. Large signal time resolved chirp measurements were made at wavelengths from 1542 to 1569 nm and were shown to exhibit negative characteristics at all wavelengths. - Author(s): J.E. Simsarian ; J. Gripp ; M. Duelk ; R. Peiró ; P. Bernasconi ; D. Stiliadis ; M. Zirngibl
- Source: Electronics Letters, Volume 40, Issue 25, p. 1600 –1602
- DOI: 10.1049/el:20047016
- Type: Article
- + Show details - Hide details
-
p.
1600
–1602
(3)
A novel load-balanced optical packet router architecture is proposed and demonstrated. High scalability and reduced complexity are achieved by using optical switch fabrics, FPGA-based 10 Gbit/s packet processors and no centralised scheduler. - Author(s): W. Wang ; K. Allaart ; D. Lenstra
- Source: Electronics Letters, Volume 40, Issue 25, p. 1602 –1603
- DOI: 10.1049/el:20046945
- Type: Article
- + Show details - Hide details
-
p.
1602
–1603
(2)
It is shown that different TE/TM mode confinement factors in a bulk semiconductor optical amplifier could not be the main reason for the gain anisotropy. Instead, the intrinsic material gain difference for TE/TM polarised light can well account for this anisotropy and its dependence on pump current. - Author(s): C. Gobby ; Z.L. Yuan ; A.J. Shields
- Source: Electronics Letters, Volume 40, Issue 25, p. 1603 –1605
- DOI: 10.1049/el:20045038
- Type: Article
- + Show details - Hide details
-
p.
1603
–1605
(3)
A weak pulse quantum key distribution system is presented, which is secure against all individual attacks, including photon number splitting. By carefully controlling the weak pulse intensity the maximum secure bit rate as a function of the fibre length is demonstrated. Unconditionally secure keys can be formed for standard telecom fibres exceeding 50 km in length.
Demonstration of connection-oriented optical burst switching network utilising PLC and MEMS switches
Demonstration of negative chirp characteristics over wide wavelength range using monolithically integrated SG-DBR laser/electroabsorption modulator
Highly-scalable load-balanced router with optical switch fabric
Semiconductor optical amplifier gain anisotropy: confinement factor against material gain
Unconditionally secure quantum key distribution over 50 km of standard telecom fibre
-
- Author(s): A. Neogi ; J. Li ; P.B. Neogi ; A. Sarkar ; H. Morkoc
- Source: Electronics Letters, Volume 40, Issue 25, p. 1605 –1606
- DOI: 10.1049/el:20046871
- Type: Article
- + Show details - Hide details
-
p.
1605
–1606
(2)
The conjugation of self-assembled modified DNA nucleosides (deoxyguanosine lipophilic derivative) to GaN/AlN semiconductor quantum dots for biophotonic application is presented. A resonant energy transfer from GaN nanostructures is observed to enhance the photoluminescence emission from the self-assembled guanosine molecules, which was tailored to achieve a bandgap resonant to the quantum dot emission energy.
Self-assembled modified deoxyguanosines conjugated to GaN quantum dots for biophotonic applications
-
- Author(s): R. Singh ; R. Paily ; A. DasGupta ; N. DasGupta ; P. Misra ; L.M. Kukreja
- Source: Electronics Letters, Volume 40, Issue 25, p. 1606 –1608
- DOI: 10.1049/el:20046763
- Type: Article
- + Show details - Hide details
-
p.
1606
–1608
(3)
A novel technique for the growth of ultrathin SiO2 at room temperature using a pulsed laser has been demonstrated. It is observed that, after an initial high growth rate, the oxide thickness reduces with time and the quality of the oxide improves. The results of our experiments show that this technique can be used to grow high quality ultrathin SiO2 films with excellent control suitable for ULSI MOSFETs. - Author(s): C.-C. Cheng ; Y.-Y. Tsai ; K.-W. Lin ; H.-I. Chen ; W.-H. Hsu ; C.-W. Hong ; W.-C. Liu
- Source: Electronics Letters, Volume 40, Issue 25, p. 1608 –1609
- DOI: 10.1049/el:20046833
- Type: Article
- + Show details - Hide details
-
p.
1608
–1609
(2)
For enhancing hydrogen detecting ability, a high-performance hydrogen sensor based on a high electron mobility transistor structure by utilising a Pd/oxide/Al0.24Ga0.76As MOS structure is fabricated and investigated. At different temperatures, hydrogen-sensing characteristics of the studied device under steady- and transition-state with different concentration hydrogen gases are measured. Even at an extremely low hydrogen concentration of 4.3 ppm H2/air, the current modulation can be found significantly. Furthermore, in comparison with other FET-type hydrogen sensors, under 9970 ppm H2/air, the studied device exhibits a much shorter response time of 10.95 s.
Laser induced oxidation for growth of ultrathin gate oxide
Temperature-dependent hydrogen sensing characteristics of a Pd/oxide/Al0.24Ga0.76As high electron mobility transistor
-
- Author(s): R. Nawaz and J.A. Chambers
- Source: Electronics Letters, Volume 40, Issue 25, p. 1609 –1611
- DOI: 10.1049/el:20047210
- Type: Article
- + Show details - Hide details
-
p.
1609
–1611
(3)
A blind adaptive channel shortening algorithm based on minimising the sum of the squared autocorrelations (SAM) of the effective channel was recently proposed. We submit that essentially identical channel shortening can be achieved by minimising the square of only a single autocorrelation. Our proposed single lag autocorrelation minimisation (SLAM) algorithm has very low complexity. We also constrain the autocorrelation minimisation with a novel stopping criterion so that the shortening signal‐to‐noise ratio (SSNR) of the effective channel is not minimised by the autocorrelation minimisation. The simulations show that SLAM achieves higher bit rates than SAM. - Author(s): Z.S.H. Chan and N. Kasabov
- Source: Electronics Letters, Volume 40, Issue 25, p. 1611 –1612
- DOI: 10.1049/el:20046785
- Type: Article
- + Show details - Hide details
-
p.
1611
–1612
(2)
A novel global clustering method called the Greedy Elimination Method is presented. Experiments show that the proposed method scores significantly lower clustering errors than the standard K-means over two benchmark and two application datasets, and it is efficient for handling large datasets. - Author(s): H. Choi and S. Choi
- Source: Electronics Letters, Volume 40, Issue 25, p. 1612 –1613
- DOI: 10.1049/el:20046791
- Type: Article
- + Show details - Hide details
-
p.
1612
–1613
(2)
Isomap is a manifold learning algorithm, which extends classical multidimensional scaling by considering approximate geodesic distance instead of Euclidean distance. The approximate geodesic distance matrix can be interpreted as a kernel matrix, which implies that Isomap can be solved by a kernel eigenvalue problem. However, the geodesic distance kernel matrix is not guaranteed to be positive semi-definite. A constant-adding method is employed, which leads to the Mercer kernel-based Isomap algorithm. Numerical experimental results with noisy. ‘Swiss roll’ data, confirm the validity and high performance of the kernel Isomap algorithm.
Blind adaptive channel shortening by single lag autocorrelation minimisation
Efficient global clustering using the Greedy Elimination Method
Kernel Isomap
-
- Author(s): A. Verma and A. Kumar
- Source: Electronics Letters, Volume 40, Issue 25, p. 1613 –1615
- DOI: 10.1049/el:20047285
- Type: Article
- + Show details - Hide details
-
p.
1613
–1615
(3)
A method for modifying voice quality attributes, i.e. breathiness and roughness, is presented in the context of voice conversion. Both breathiness and roughness of a speaker are collectively modelled by harmonic peak-to-valley ratio (HPVR) in the speaker's speech spectrum. The average HPVR is modified through a post-filtering operation after the conversion of spectral envelope, pitch and other speaker individuality features. It is shown that average HPVR for various speakers correlates well with the perceived breathiness and roughness in their voices. Further, it is shown through subjective experiments that the proposed modification in HPVR results in improved subjective rating of the transformed speech signal.
Modification of harmonic peak-to-valley ratio for controlling roughness in voice conversion
Most viewed content for this Journal
Article
content/journals/el
Journal
5
Most cited content for this Journal
-
Extreme multistability in a memristive circuit
- Author(s): Bo-Cheng Bao ; Quan Xu ; Han Bao ; Mo Chen
- Type: Article
-
Absorptive frequency selective surface using parallel LC resonance
- Author(s): Qiang Chen ; Liguo Liu ; Liang Chen ; Jiajun Bai ; Yunqi Fu
- Type: Article
-
Partial spectral search-based DOA estimation method for co-prime linear arrays
- Author(s): Fenggang Sun ; Peng Lan ; Bin Gao
- Type: Article
-
Experimental verification of on-chip CMOS fractional-order capacitor emulators
- Author(s): G. Tsirimokou ; C. Psychalinos ; A.S. Elwakil ; K.N. Salama
- Type: Article
-
54 Gbit/s OOK transmission using single-mode VCSEL up to 2.2 km MMF
- Author(s): G. Stepniak ; A. Lewandowski ; J.R. Kropp ; N.N. Ledentsov ; V.A. Shchukin ; N. Ledentsov Jr. ; G. Schaefer ; M. Agustin ; J.P. Turkiewicz
- Type: Article