阈上正弦波光栅调幅与调频的可检测性

Detectability of amplitude- and frequency-modulation of suprathreshold sine-wave gratings.

作者信息

Jamar J H, Campagne J C, Koenderink J J

出版信息

Vision Res. 1982;22(3):407-16. doi: 10.1016/0042-6989(82)90157-2.

Abstract

The detectability of amplitude- and frequency-modulation of sine-wave carrier gratings was measured for a number of carrier frequencies, modulation frequencies and carrier contrasts. The results show that for low modulation frequencies (spatial frequency components close together; separation less than 0.5 x carrier frequency) modulation thresholds are determined by both the amplitude and phase spectrum of the stimulus; for high modulation frequencies (frequency components more widely separated) they are determined by the amplitude spectrum only. The dependence of modulation thresholds on carrier contrast was found to be very similar, irrespective of the modulation frequency, carrier frequency and kind of modulation selected, and was in agreement with known results of contrast-difference threshold measurements and of masking experiments.

摘要

针对多个载波频率、调制频率和载波对比度，测量了正弦波载波光栅的幅度调制和频率调制的可检测性。结果表明，对于低调制频率（空间频率分量靠得很近；间距小于载波频率的0.5倍），调制阈值由刺激的幅度谱和相位谱共同决定；对于高调制频率（频率分量间隔更宽），它们仅由幅度谱决定。发现调制阈值对载波对比度的依赖性非常相似，与所选的调制频率、载波频率和调制类型无关，并且与对比度差异阈值测量和掩蔽实验的已知结果一致。