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Articles by H.P. Singh
Total Records ( 2 ) for H.P. Singh
  Man Singh , A. Singh , R.S. Tripathi , R.K. Verma , M.M. Gupta , H.O. Mishra , H.P. Singh and A.K. Singh
  About 4 strains of kalmegh (Andrographis paniculata Nees.), CIMAP/AP-3, CIMAP/AP-10 and CIMAP/AH-89 and local check were evaluated at three population densities (74,074, 111,111 and 222,222 plants ha-1) for growth behavior, biomass and diterpenoid lactones production at the Central Institute of Medicinal and Aromatic Plants, Lucknow, India during July to November, 2004 and 2005. The strain CIMAP/AP-3 was found to possess desired agronomic traits viz., 60 cm plant height, 45 cm plant spread, 28 branches per plant and 60° branching angle from main shoot. The advantage in biomass and diterpenoid lactones (andrographolide and neo-andrographolide) production with CIMAP/AP-3 over other strains was 33.4-79.4 and 31.6-70.7%, respectively. Planting at a closer spacing of 30x15 cm accommodating 2,22,222 plants ha-1 produced maximum dry biomass and andrographolide and neoandrographolide yield under the subtropical climate of North India.
  H.P. Singh , S. Singh and J. Singh
  The speech signal is degraded due to delay, jitter and packet losses, when passed through different network layers of internet protocol based Voice over Internet Protocol (VoIP) system. The speech quality of the VoIP system can be improved by reducing the background noise, codec distortions and various network impairments such as packet loss, delay and jitter. The work in this paper proposes the Finite Impulse Response filter (FIR) based scheme for speech quality improvement of the VoIP signal. The lab experiment is performed to realize the VoIP system and to obtain the degraded database. For various noisy conditions, the performance of the enhanced VoIP signal is evaluated using Perceptual Evaluation of Speech Quality (PESQ) measurement for narrowband signal. The results show much improvement in speech quality with proposed method.
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