摘要:

The interactions between phase, signal level, and interstimulus interval (Δt) were examined in the transition region between simultaneous and nonsimultaneous masking. Phase effects as large as 22 dB were observed in forward masking. These trends can be explained by considering the effects of phase upon the stimulus envelope.

ISSN:0001-4966    

DOI:10.1121/1.384262

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

摘要:

The absolute sensitivity of the binaural auditory system was studied by asking subjects to discriminate tones that were truly monaural from dichotic tones that sounded monaural because of an extremely large interaural difference of intensity. Thresholds for this discrimination across the range of frequencies from 250 to 4000 Hz were achieved when the tones in the weaker channel were in the region from −45 to −50 dB relative to tones in the stronger channel. Since the monaural reference tones, as well as the stronger signals in the dichotic conditions, were chosen to be 61 dB sensation level (SL), the weakest levels for which binaural interaction could be measured appear to have been on the order of 10 to 15 dB SL.

ISSN:0001-4966    

DOI:10.1121/1.384263

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

摘要:

Three normal adult subjects were filmed using lateral‐view, high‐speed cineradiography to measure the amount of movement of external skin points on the jaw relative to the underlying jaw bone. Metal markers were secured to the skin to simulate cantilever beam attachment points commonly utilized in the strain gauge transduction of jaw movements. Standard deviations of chin marker movement relative to the jaw ranged from 0.52 to 1.28 mm in an anterior–posterior direction and 0.67 to 2.31 mm in a superior–inferior direction. Lower lip and chin marker positions were highly correlated in the superior–inferior direction. Chin marker positions tended to be more superior and, in one subject, more anterior for labial than for nonlabial contexts. The degree of variability was not systematically different for the two different contexts.

ISSN:0001-4966    

DOI:10.1121/1.384264

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

摘要:

The effect of increased vertical bite dimension on fricative sound productions was studied in five adults who wore dentures. Oral port size and sound intelligibility were evaluated at different degrees of artificially induced open bite. The data demonstrate that rapid compensatory adjustments occurred and oral port size changed minimally at all degrees of opening tested. However, in three of the subjects, sound intelligibility declined at the 6‐mm opening, and in all subjects, a four‐fold increase in sound distortions occurred in the edentulous state. This finding suggests the possibility that either physiological parameters are controlled more successfully than acoustical parameters or that compensatory efforts to maintain constrictor size may, under certain circumstances, adversely affect sound intelligibility.

ISSN:0001-4966    

DOI:10.1121/1.384265

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

摘要:

For determining acoustic impedances the direct methods are now often used, based on measuring the sound pressure excited on a measured object by the known volume velocity. With the sine sweep technique it is easily possible to maintain, with sufficient accuracy, the generated volume velocity constant. When using direct methods at higher frequencies gross errors can arise from the sound field inhomogenities in the coupling space among the sound source, the measuring microphone, and the measured object. For some coupling configurations it is, however, possible to find acceptable relations between the measured and the sought values.

ISSN:0001-4966    

DOI:10.1121/1.384266

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.384268

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.384273

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.384276

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.384204

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.384280

出版商:Acoustical Society of America    

年代:1980

数据来源: AIP