tag:blogger.com,1999:blog-5710154754051552762.post6291652470701741337..comments2019-10-02T12:42:03.888-07:00Comments on Human and Machine Hearing: ErrataDick Lyonhttp://www.blogger.com/profile/04815784352169989383noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-5710154754051552762.post-6375041166917474052018-02-13T21:42:52.658-08:002018-02-13T21:42:52.658-08:00I've been talking this over with Volker and en...I've been talking this over with Volker and encouraging him to post here; but when he tried it didn't work, so I had to open up anonymous comments, and now it does. He's right, and fixing this is complicated. I'm working on a short paper on the impulse invariance method, to acknowledge my error, fix it, and see how much it matters (not a lot, fortunately).Dick Lyonhttps://www.blogger.com/profile/04815784352169989383noreply@blogger.comtag:blogger.com,1999:blog-5710154754051552762.post-40393856429727553122018-02-01T09:11:14.452-08:002018-02-01T09:11:14.452-08:00Hi Dick,
thanks for the excellent book! I just wa...Hi Dick,<br /><br />thanks for the excellent book! I just want to comment on the<br />impulse-invariant Gammatone design, which I think is not described correctly. Applying the Z transform on the sampled Gammatone filter impulse response yields both poles and zeros, not only poles. The difference between the all-pole design and the impulse-invariant design with poles and zeros, however, is rather small, at least for filters with center frequencies not too close to the Nyquist frequency.<br /><br />Volker HohmannAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5710154754051552762.post-80153652887368900982017-07-25T12:11:34.899-07:002017-07-25T12:11:34.899-07:00Thanks, Wan-Teh, for these and all your many previ...Thanks, Wan-Teh, for these and all your many previous pre-publication bug reports. More dollars coming your way.Dick Lyonhttps://www.blogger.com/profile/04815784352169989383noreply@blogger.comtag:blogger.com,1999:blog-5710154754051552762.post-80449484761478833042017-07-25T09:38:19.766-07:002017-07-25T09:38:19.766-07:00Hi Dick,
I'd like to report two errors in Cha...Hi Dick,<br /><br />I'd like to report two errors in Chapter 7.<br /><br />1. P.128, Sec. 7.5: In the second-to-last equation on this page:<br /><br /> H(z)X(z) = Z{h(k) * x(k)}<br /><br />Square brackets, not parentheses, should be used with the discrete-time signals h and x:<br /><br /> H(z)X(z) = Z{h[k] * x[k]}<br /><br />2. P. 132, Sec. 7.7: In the box "Detail: Zeros at the Origin", the last paragraph says:<br /><br /> ...; s-domain points that would map to z = 0 are infinitely far to the right side in the s plane, ...<br /><br />"right" should be changed to "left". <br /><br />I found a webpage that describes the s plane to z plane mapping in detail:<br /><br />http://fourier.eng.hmc.edu/e102/lectures/Z_Transform/node2.html<br /><br />Wan-Teh ChangWan-Teh Changhttps://www.blogger.com/profile/00138117663738957734noreply@blogger.comtag:blogger.com,1999:blog-5710154754051552762.post-55638414038050784412017-07-22T09:41:15.708-07:002017-07-22T09:41:15.708-07:00Thanks, André, you get that dollar!
Thanks, André, you get that dollar!<br />Dick Lyonhttps://www.blogger.com/profile/04815784352169989383noreply@blogger.comtag:blogger.com,1999:blog-5710154754051552762.post-44238633156881083202017-07-19T19:59:42.799-07:002017-07-19T19:59:42.799-07:00Hi Dick,
Really nice job on the book! The erroneo...Hi Dick,<br /><br />Really nice job on the book! The erroneous word in 17.2 is ‘sampling’ in the first line of the second paragraph on p 311. Should be ‘damping’.<br /><br />AndréAnonymoushttps://www.blogger.com/profile/06147226021067929811noreply@blogger.comtag:blogger.com,1999:blog-5710154754051552762.post-69252623988179397352017-06-21T23:09:16.616-07:002017-06-21T23:09:16.616-07:00I'm not to section 17 yet, but this sentence f...I'm not to section 17 yet, but this sentence from 6.2 should be fixed. <br />"A system is a device or a mathematical abstraction that maps an input function of time to an output function to time."3rickhttps://www.blogger.com/profile/16363621129640272102noreply@blogger.com