A COMPUTATIONAL MODEL OF ECHO PROCESSING AND ACOUSTIC IMAGING IN FREQUENCY-MODULATED ECHOLOCATING BATS - THE SPECTROGRAM CORRELATION AND TRANSFORMATION RECEIVER
A COMPUTATIONAL MODEL OF ECHO PROCESSING AND ACOUSTIC IMAGING IN FREQUENCY-MODULATED ECHOLOCATING BATS - THE SPECTROGRAM CORRELATION AND TRANSFORMATION RECEIVER
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DOI：
10.1121/1.407353
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发表时间：
1993-11-01
影响因子：
2.4
通讯作者：
DEAR, SP
中科院分区：
文献类型：
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作者：
SAILLANT, PA;SIMMONS, JA;DEAR, SP
大褐蝠（Eptesicus fuscus）声纳接收机的频谱图关联与变换（SCAT）模型由一个耳蜗组件将蝙蝠调频声纳传输和多频调频回波以频谱图形式编码，然后通过两条并行路径处理声纳回波中的时间和频谱信息，从回波频谱图中重建多个目标的绝对距离和精细距离结构组成。沿着这些并行路径进行的计算的输出收敛，以沿着回波延迟或目标范围的计算图像尺寸显示。所得图像沿距离轴描绘了不同目标中各种反射源的位置。这一系列变换相当于对声纳回波进行同时、平行的正变换和逆变换，通过对声纳回波图进行反卷积得到目标的脉冲响应。该模型的性能准确地再现了Eptesicus在各种行为实验中感知到的图像，包括距离的双闪烁分辨率、回波相位灵敏度、距离估计的幅值延迟交易、时域和频域图像分量的分离以及噪声中的测距精度。
The spectrogram correlation and transformation (SCAT) model of the sonar receiver in the big brown bat (Eptesicus fuscus) consists of a cochlear component for encoding the bat's frequency modulated (FM) sonar transmissions and multiple FM echoes in a spectrogram format, followed by two parallel pathways for processing temporal and spectral information in sonar echoes to reconstruct the absolute range and fine range structure of multiple targets from echo spectrograms. The outputs of computations taking place along these parallel pathways converge to be displayed along a computed image dimension of echo delay or target range. The resulting image depicts the location of various reflecting sources in different targets along the range axis. This series of transforms is equivalent to simultaneous, parallel forward and inverse transforms on sonar echoes, yielding the impulse responses of targets by deconvolution of the spectrograms. The performance of the model accurately reproduces the images perceived by Eptesicus in a variety of behavioral experiments on two-glint resolution in range, echo phase sensitivity, amplitude-latency trading of range estimates, dissociation of time- and frequency-domain image components, and ranging accuracy in noise.