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The historical site of Bamiyan is affected by geomorphological deformation processes which were enhanced during the Talibans’ bombing in March 2001, when the two standing Buddhas, dating back to sixth century a.d. were destroyed. An invaluable cultural heritage was irremediably lost and the consequences of the explosions, as well as the collapse of the giant statues, added greatly to the geological...
This paper presents the design and implementation of a high-performance fully-digital PWM DAC and switching output stage which can drive a speaker in portable devices, including cellular phones. Thanks to the quaternary pulse-width modulation scheme, filter-less implementation are possible. A pre-modulation DSP algorithm eliminates the harmonic distortion inherent to the employed modulation process,...
An on-chip CMOS digital anticlipping circuit that requires no external components is presented. Four anticlipping thresholds, i.e. ??15dBmO, ??13dBmO, ??9dBmO, and ??7dBmO, and four gain recovery time constants, i.e. 16msec, 32msec, 128msec, and 256msec, can be programmed via a dedicated 4-bits control register. The extra area added to the chip to implement the anticlipping function is about 1 mm2...
A 5V programmable acoustic front-end IC for ISDN terminal and digital telephone set applications is presented. The chip performs PCM codec and filter functions fulfilling and exceeding all D3/D4 and CCITT specs. It implements the analog interfaces required for the speech (low noise microphone preamplifier, earpiece and loudspeaker drivers, sidetone, antilarsen control) and tone/ring/DTMF generation...
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