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Echo cancellation is one of the key technologies for digital repeater. Based on the Standard of China for DTMB (Digital Television Terrestrial Multimedia Broadcasting), a scheme of actualizing echo cancellation with adaptive filter is presented in this paper. Using matlab Simulink as the platform, we added PN sequence to digital TV signals, then, estimated(More)
OBJECTIVE To analyze the judgement standard and evaluate the diagnostic value of the low frequency and high frequency tympanometry in infants with otitis media. METHOD Tympanograms for admittance with 226 Hz and 1 000 Hz probe tones and resonant frequency were obtained from normal infants (195 cases, 321 ears) and infants with otitis media(122 cases, 171(More)
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