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Optimal Design of Active RC Networks
Published in John T. Taylor, Qiuting Huang, CRC Handbook of ELECTRICAL FILTERS, 2020
RC active filters are limited by the frequency range of the amplifiers and in most cases operate below 1 MHz. They are used mostly in the acoustic frequency range, from 10 Hz to 20 kHz, or in telephone lines where the voice band is limited to 3.4 kHz. In telephone applications, where a limited dynamic range is acceptable, switched-capacitor filters have been more successful because of their low production cost and small physical dimensions. If high dynamic range and low noise are of importance, then active RC filters are preferred. In addition, fast design and low cost of components, like 1% resistors and 5% capacitors, make the use of RC filters very practical. We first list some cases where active RC filters are practical.
ATM Networking: Implementation Considerations
Published in P. S. Neelakanta, ATM Telecommunications, 2018
Voice band traffic refers to and includes the speech, fax data, modem data, and recorded audio (music etc.). There are two approaches that can be used for the transport of such voice traffic over ATM networks: ✓ Under constant bit rate (CBR) traffic conditions, using AAL-1 to support circuit emulation service (CES)✓ Under real-time variable-bit-rate (rt-VBR) traffic conditions, using AAL-2 or AAL-5 adaptation.
Editorial: an Australian perspective on multidisciplinary engineering
Published in Australian Journal of Multi-Disciplinary Engineering, 2018
The second paper (Al-Rawi 2018) examines the 32 kilo-bit per second (32 kb/s) Adaptive Differential Pulse Code Modulation (ADPCM) which suffers distortion in the voiceband sampling frequencies of greater than 4.8 kb/s. Various methods to overcome this limitation are considered, and two specific detectors are presented that handle the severe distortion introduced by 32 kb/s ADPCM. These two designs are compared with a previously developed detector, and test and simulation results show improved performance.