A family of digital parametric audio equalizers based on high-order Butterworth, Chebyshev, and elliptic analog prototype filters is derived that generalizes the conventional biquadratic designs and provides flatter passbands and sharper bandedges. The equalizer filter coefficients are computable in terms of the center frequency, peak gain, bandwidth, and bandwidth gain. We consider the issues ...

Multichannel optical add-drop processes are studied in a class of symmetric waveguide-resonator systems. With insight gained from group theory, we analyze these systems and show that they can add or drop multiple wavelengths simultaneously, with 100% efficiency. A new mechanism is presented to reduce the remnant light at the dropped wavelengths in the pass-through port. High-order Butterworth f...

In this paper novel compression techniques are developed for portable heart-monitoring equipment that could also form the basis for more intelligent diagnostic systems thanks to the way the compression algorithms depend on signal classification. There are two main categories of compression which are employed for electrocardiogram signals: lossless and lossy. Design of an optimal Wiener filter i...

This correspondence introduces a new class of infinite impulse response (IIR) digital filters that unifies the classical digital Butterworth filter and the well-known maximally flat FIR filter. New closedform expressions are provided, and a straightforward design technique is described. The new IIR digital filters have more zeros than poles (away from the origin), and their (monotonic) square m...

Fractional-order Butterworth filters of order 1 + α (0 < 1) can be implemented by a unified structure, using the method presented in this paper. The main offered benefit is that cutoff frequencies are fully controllable very simple and, also, various types (e.g., low-pass, high-pass, band-pass, and band-stop) could realized. Thanks to employment Field Programmable Analog Array device, implem...

Wearable devices used for human body monitoring has broad applications in smart home, sports, security and other fields. provide an extremely convenient way to collect a large amount of motion data. In this paper, the acceleration feature extraction method based on wearable is studied. Firstly, Butterworth filter Then, order ensure extracted value more accurately, it necessary remove abnormal d...

Infants follow the gaze direction of others from the middle of the first year of life. In attempting to determine how infants understand the looking behavior of adults, a number of recent studies have blocked the adult's line of sight in some way (e.g. with a blindfold or with a barrier). In contrast, in the current studies an adult looked behind a barrier which blocked the child's line of sigh...

ship of Sip H. Rolleston, Bt., G.C.V.O., K.vp'' M.D., D.Sc., D.C.L., LL.D. 1938. Butterwort" and Company, Limited, London. (To be compl?1? in 12 volumes.) Sold in complete sets only. Caj* price, Rs. 25 pep volume. Also available on th instalment system at Rs. 10 pep month. Pr|c?' Rs. 26-8 pep volume. Only available fp0!^ Messrs. Butterworth and Company (India)' Limited, Calcutta. Volume VIII. P...

Medical Students and Clinical Assistants, ny Caleb, m.b., m.s. (Durham), Prof, of Physiology, King Edward Medical College, Lahore, etc. Messrs. Butterworth & Co., Calcutta, 1919. Physiological chemistry is a subject that is becoming yearly of greater importance in scientific medicine. The future study of medicine will undoubtedly be very intimately associated with advances in our knowledge of t...

Biomechanical studies of movement kinematics and kinetics often involve the measurement of analog quantities through discrete sampling of the signal at some regular interval. The digital data which result can, in most cases, adequately represent the original signal, providing the sampling frequency is high enough to respond to the high frequency components of that signal (Winter, 1979, p. 28). ...