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A sine-to-triangular wave converter based on operational transconductance amplifiers (OTAs) is proposed in this paper. The realization method exploits a hyperbolic tangent behavior of an OTA to convert from a sine wave to a triangular wave. The proposed circuit provides a simple configuration and employs only OTAs as the active elements. This scheme can be operated in both a voltage-controlled mode and a current-controlled mode. The performances of the proposed circuit are discussed in detail and confirmed by the experimental results.

This paper presents system development for quality evaluation of fish fillet using image processing. The proposed system consists of conveyer belt, Ultraviolet (UV) lamp, CCD Camera, electronic circuits, interface card and computer. K-means clustering and thresholding techniques are used for quality evaluation of fish fillet. The image segments are used to calculated area of fish fillet and fish bone. The quality of fish fillet is based on percentage of fish fillet and fish bone area. The experimental results show that the proposed system can evaluate quality of fish fillet.

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In this paper, a triangular-to-sawtooth waveform converter and a control logic circuit have been described. Using two designed circuits connected with OTA-based sine-to-triangular wave converter and demodulator, a resolver-to-DC converter is proposed. The converter linearly produces output signal proportional to the shaft angle in full range of 360°. Experimental results verifying the performances of the proposed converter circuit agree well with the theoretical prediction.Keywords: Resolver converter, inverse-sine function circuit, arcsine function circuit and sine-to-triangular converter.order to obtain the ease of design, we let the amplitudes of the voltage V s and V c are equal to one, that can be expressed asThe OTA-based sine-to-triangular converter functions as the inverse-sine function circuit with dynamic range of ± n/2, this circuit is connected to convert the voltage V s into the current signal la, which can be written as where Go is a constant gain of sine-to-triangular converter [7]. From Eq. (3) for ±2n-range the current signal 1 0 is a piecewise-linear function of the shaft angle B. To improve results of the resolver converter, the current 1 0 is fed to the triangular-to-sawtooth waveform converter. Considering the block of triangular-tosawtooth waveform converter, the scheme composes operational amplifiers (Op Amps) A 3-A6 , analog switches SWI-SW3, and DC-voltage source V 3 connected with nine resistors. The operation of this scheme can be explained as follows. Op Amp A 4 connected with the resistors R1 and R 2 transfers the current signal 1 0 into the signal voltage Va and also functions as a inverting-amplifier for the voltage Va and V 2 , which can be stated as (3) (2); 0 <181