Time-frequency model for echo-delay resolution in wideband biosonar.
Time-frequency model for echo-delay resolution in wideband biosonar.
复制标题
宽带生物声纳中回波延迟分辨率的时频模型。
DOI：
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复制
发表时间：
2003
影响因子：
2.4
通讯作者：
J. Simmons
中科院分区：
文献类型：
--
作者：
N. Neretti;M. Sanderson;N. Intrator;J. Simmons
建立了蝙蝠听觉系统的时间/频率模型，以检验大棕蝙蝠（Eptesicus fuscus）的精细（约2微米）回声延迟分辨率的基础，并计算了其在不同信噪比下分辨蝙蝠20-100 khz频段内紧密间隔的FM声纳回声的性能。该模型使用间隔在该频带上的平行带通滤波器来产生包络，这些包络的带宽比蝙蝠的超声波声纳声音要低得多，但仍然可以达到很好的延迟分辨率。由于精细的延迟分离在模型滤波器的积分时间内（大约250-300微米），因此解决它们意味着使用沿频率维度（频谱峰值和陷波）的干涉模式。滤波器输出的低带宽内容适用于将信息中继到本质上具有较差时间响应特性的高级听觉区域。如果在完全并行的模拟-数字硬件中实现，该模型的计算效率极高，将提高军事和工业声纳接收机的分辨率。
A time/frequency model of the bat's auditory system was developed to examine the basis for the fine (approximately 2 micros) echo-delay resolution of big brown bats (Eptesicus fuscus), and its performance at resolving closely spaced FM sonar echoes in the bat's 20-100-kHz band at different signal-to-noise ratios was computed. The model uses parallel bandpass filters spaced over this band to generate envelopes that individually can have much lower bandwidth than the bat's ultrasonic sonar sounds and still achieve fine delay resolution. Because fine delay separations are inside the integration time of the model's filters (approximately 250-300 micros), resolving them means using interference patterns along the frequency dimension (spectral peaks and notches). The low bandwidth content of the filter outputs is suitable for relay of information to higher auditory areas that have intrinsically poor temporal response properties. If implemented in fully parallel analog-digital hardware, the model is computationally extremely efficient and would improve resolution in military and industrial sonar receivers.
影响因子：
2.4
作者：
SAILLANT, PA;SIMMONS, JA;DEAR, SP
通讯作者：
DEAR, SP
DOI：
10.1073/pnas.95.21.12647
发表时间：
1998-10-13
影响因子：
11.1
作者：
Simmons, JA;Ferragamo, MJ;Moss, CF
通讯作者：
Moss, CF