scholarly journals AN INVESTIGATION INTO THE ACTUAL CONDITION AND SUBJECTIVE EVALUATION TEST OF ACOUSTICAL ENVIRONMENT IN RAILWAY STATION

2011 ◽  
Vol 76 (660) ◽  
pp. 115-124 ◽  
Author(s):  
Yasuhiko IZUMI ◽  
Kojiro FUJII ◽  
Teruo IWASE
Keyword(s):  
Subjective Evaluation ◽  
Actual Condition ◽  
Railway Station ◽  
Evaluation Test

Subjective Analysis and Objective Evaluation of Vehicle Sound Quality

2013 ◽  
Vol 716 ◽  
pp. 674-679 ◽  
Author(s):  
Yan Yan Zuo ◽  
Shuai Li Zhou ◽  
Wen Feng Zhou
Keyword(s):  
Constant Velocity ◽  
Paired Comparison ◽  
Subjective Evaluation ◽  
Objective Evaluation ◽  
Sound Quality ◽  
Comparison Method ◽  
Acoustical Parameters ◽  
Vehicle Interior ◽  
Subjective Analysis ◽  
Evaluation Test

The interior noise samples from four cars at different positions and different speeds were selected as the evaluation objects. The subjective evaluation test of sound quality preference was carried out with paired comparison method. Several objective psycho-acoustical parameters of these samples were calculated. By way of linear correlation and multi-dimensional regression analysis, an equation between the subjective evaluation of noise preference and the objective psycho-acoustical parameters was established. The results indicate that the vehicle interior sound quality preference under the good highway and the constant-velocity driving conditions is affected mainly by two psycho-acoustical parameters Loudness and Sharpness.

scholarly journals Improved Frame Error Concealment Algorithm Based on Transform- Domain Mobile Audio Codec

2014 ◽  
Vol 8 (1) ◽  
pp. 527-535
Author(s):  
Kai Xiang ◽  
Shihong Chen ◽  
Yuanyuan Zeng
Keyword(s):  
Error Concealment ◽  
Subjective Evaluation ◽  
Attenuation Factor ◽  
Gain Control ◽  
Performance Comparison ◽  
Stream Data ◽  
Control Approach ◽  
Original Algorithm ◽  
Evaluation Test ◽  
Audio Codec

In this paper, we propose an improved frame error concealment algorithm for TCX-based audio coders in order to improve the quality of decoded audio at the receiver. Conventional TCX-based frame error concealment algorithms in the AMR-WB+ audio codec are usually unable to adaptively adjust gain control according to changes in the magnitude of the correct frame before lost frames. Thus, we propose a new gain control approach based on stability of LPC filter, and the stream data need to contain the line spectrum frequency data and utilize different continuous attenuation factor formula based on different categories of lost frames. The proposed frame error concealment algorithm is designed for TCX-based audio codec. We make the performance comparison between the proposed method and the original algorithm currently employed in AMR-WB+ audio codec through the objective evaluation test and subjective evaluation test. The results prove that our algorithm can achieve better audio recovery quality than original frame error concealment algorithm employed in AMR-WB+ speech codec.

Case study: Effect of visual and task conditions on the subjective evaluation of the sound environments inside running passenger cars

2019 ◽  
Vol 67 (3) ◽  
pp. 210-218 ◽  
Author(s):  
T. Asakura
Keyword(s):  
Subjective Evaluation ◽  
Visual Stimuli ◽  
Differential Method ◽  
Video Data ◽  
Passenger Cars ◽  
Subjective Impression ◽  
Head Mounted Display ◽  
Evaluation Test ◽  
Driving Task ◽  
Task Conditions

The effect of the additionally presented visual stimuli and driving task on the subjective evaluation of the sound inside running passenger car has been investigated through subjective evaluation test on the semantic differential method. The recorded video data and binaural sound data were simultaneously presented to the subjects by using the headphone and the head-mounted display. As a result of the evaluation test, the subjective impression of the interior sound greatly varied depending on the visual stimuli and the driving task. Especially in the situation that the LAeq of the interior sound is relatively low, the evaluated results are more strongly influenced by the visual stimuli and the driving task.

scholarly journals Asymmetrische Plurizentrizität und Sprachbewusstsein / Asymmetric Pluricentricity and Language Awareness: The Swiss Germans' Attitudes towards Standard German

2005 ◽  
Vol 33 (2-3) ◽  
Author(s):  
Joachim Scharloth
Keyword(s):  
Language Attitudes ◽  
Subjective Evaluation ◽  
Empirical Studies ◽  
Language Awareness ◽  
Standard Variety ◽  
Language Community ◽  
Negative Attitudes ◽  
Community Influences ◽  
Evaluation Test ◽  
German Speaking

AbstractThe paper examines the language attitudes in non-dominating language communities of pluricentric languages. It asks in what way the fact of being a speaker of a non-dominating language community influences the perception of the own competence and of the evaluation of the different standard varieties of the pluricentric language. By examining the attitudes towards Swiss Standard German in German-speaking Switzerland it argues that speakers of non-dominating language communities often have the notion that their own standard variety being deficient combined with a feeling of lingual inferiority towards the speakers of the dominating community. Thus, the standard variety of the dominating community serves as a prestigious variety. In Switzerland these attitudes strongly correlate with the age of the acquisition of Standard German and the negative attitudes towards Germans. Finally the paper raises the question whether the concept of pluricentricity can adequately be used when there ist no awareness of pluricentricity among the speakers. The data presented derives from two empirical studies conducted in Switzerland in the summer of 2003: a survey on language attitudes and a subjective evaluation test.

On a Subjective Evaluation Model by a Generalized Fuzzy Integral

1997 ◽  
Vol 05 (05) ◽  
pp. 517-529 ◽  
Author(s):  
Haruki Imaoka
Keyword(s):  
Choquet Integral ◽  
Evaluation Model ◽  
Subjective Evaluation ◽  
Fuzzy Integral ◽  
Sugeno Integral ◽  
Evaluation Test

First, a generalized fuzzy integral which encompasses Sugeno integral, Choquet integral and opposite-Sugeno integral is proposed. A more restricted fuzzy integral can be expressed by using only one parameter of Frank's t-norm. It also encompasses the three integrals. Next, the performance when the integral is adopted as a subjective evaluation model is theoretically investigated. Finally, an example of subjective evaluation test is shown and is discussed.

Correlation between dislocation, grain boundary and interface of duplex SS in stress corrosion cracking(SCC)

1990 ◽  
Vol 48 (4) ◽  
pp. 928-929
Author(s):  
Wang Zheng-fang ◽  
Z.F. Wang
Keyword(s):  
Stainless Steel ◽  
Thermal Cycle ◽  
Secondary Phase ◽  
Corrosion Cracking ◽  
Coarse Grained ◽  
Test Environment ◽  
Fine Grained ◽  
Evaluation Test ◽  
Welding Thermal Cycle ◽  
Micro Analysis

The main purpose of this study highlights on the evaluation of chloride SCC resistance of the material,duplex stainless steel,OOCr18Ni5Mo3Si2 (18-5Mo) and its welded coarse grained zone(CGZ).18-5Mo is a dual phases (A+F) stainless steel with yield strength:512N/mm2 .The proportion of secondary Phase(A phase) accounts for 30-35% of the total with fine grained and homogeneously distributed A and F phases(Fig.1).After being welded by a specific welding thermal cycle to the material,i.e. Tmax=1350°C and t8/5=20s,microstructure may change from fine grained morphology to coarse grained morphology and from homogeneously distributed of A phase to a concentration of A phase(Fig.2).Meanwhile,the proportion of A phase reduced from 35% to 5-10°o.For this reason it is known as welded coarse grained zone(CGZ).In association with difference of microstructure between base metal and welded CGZ,so chloride SCC resistance also differ from each other.Test procedures:Constant load tensile test(CLTT) were performed for recording Esce-t curve by which corrosion cracking growth can be described, tf,fractured time,can also be recorded by the test which is taken as a electrochemical behavior and mechanical property for SCC resistance evaluation. Test environment:143°C boiling 42%MgCl2 solution is used.Besides, micro analysis were conducted with light microscopy(LM),SEM,TEM,and Auger energy spectrum(AES) so as to reveal the correlation between the data generated by the CLTT results and micro analysis.

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