giulio modena - Academia.edu (original) (raw)
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Papers by giulio modena
ICASSP '82. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1982
Carbon microphones are non linear and time varying devices, so that their response curve widely d... more Carbon microphones are non linear and time varying devices, so that their response curve widely depends on the type of excitation signal, To carry our measurements well correlated with the real performance, the transducers must be excitated by a signal as close as possible to real voice. For the artificial signals already proposed, the attention was practically concentrated on both
The Journal of the Acoustical Society of America, 1978
Up until today the CCITT has recommended provisionally the use of the IEC artificial ear as an ac... more Up until today the CCITT has recommended provisionally the use of the IEC artificial ear as an acoustic load to measure the sensitivity/frequency curve for telephone receivers. This artificial ear was obtained for audiometric requirements. In the telephone use the acoustic leak greatly influences the acoustic load. In this paper we describe an automatic system for the impedance measurement in module and phase versus frequency of the human ear measured during the telephone use. The measurements were obtained with a telephone handset in a normal use. The telephone handset was the acoustic source. A microphone probe at the handset auricle center drew the acoustic pressure. Measurements were made on 50 subjects at two different sound levels. After obtaining the electric simultation of the acoustic impedance shape we built a prototype of a new artificial ear for telephone use. The results obtained using constructed prototypes are shown. Measurements were carried out of the response curves of three different te...
IEEE Journal on Selected Areas in Communications, 1988
European Transactions on Telecommunications, 1991
The paper presents the research topics of the MProgetto Finaliiuato Telecomunicazioniw partially ... more The paper presents the research topics of the MProgetto Finaliiuato Telecomunicazioniw partially founded by CNR (National Council for Research) on the multi-media terminals, video broadcast terminal and HDTV (Nigh Definition Television) signal processing. It describes the main features of a full ATM Workstation, of ISDN multiservice terminal and digital video broadcast codec connected to ATM node. It presents also the studies on HDTV by simulation of algorithm.
European Transactions on Telecommunications, 1991
A fully digital differential PCM system with adaptive quantization transmitting a speech channel ... more A fully digital differential PCM system with adaptive quantization transmitting a speech channel at 32 kbit/s rate is described. Its performance in terms of subjective and objective measurements are shown and compared with a 64 kbit/s log-PCM system. Two different solutions for the prototype ADPCM 740/58 system at 2.049 Mbit/s ratio are proposed: either to receive two separate PCM streams
ICASSP '82. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1982
Carbon microphones are non linear and time varying devices, so that their response curve widely d... more Carbon microphones are non linear and time varying devices, so that their response curve widely depends on the type of excitation signal, To carry our measurements well correlated with the real performance, the transducers must be excitated by a signal as close as possible to real voice. For the artificial signals already proposed, the attention was practically concentrated on both
The Journal of the Acoustical Society of America, 1978
Up until today the CCITT has recommended provisionally the use of the IEC artificial ear as an ac... more Up until today the CCITT has recommended provisionally the use of the IEC artificial ear as an acoustic load to measure the sensitivity/frequency curve for telephone receivers. This artificial ear was obtained for audiometric requirements. In the telephone use the acoustic leak greatly influences the acoustic load. In this paper we describe an automatic system for the impedance measurement in module and phase versus frequency of the human ear measured during the telephone use. The measurements were obtained with a telephone handset in a normal use. The telephone handset was the acoustic source. A microphone probe at the handset auricle center drew the acoustic pressure. Measurements were made on 50 subjects at two different sound levels. After obtaining the electric simultation of the acoustic impedance shape we built a prototype of a new artificial ear for telephone use. The results obtained using constructed prototypes are shown. Measurements were carried out of the response curves of three different te...
IEEE Journal on Selected Areas in Communications, 1988
European Transactions on Telecommunications, 1991
The paper presents the research topics of the MProgetto Finaliiuato Telecomunicazioniw partially ... more The paper presents the research topics of the MProgetto Finaliiuato Telecomunicazioniw partially founded by CNR (National Council for Research) on the multi-media terminals, video broadcast terminal and HDTV (Nigh Definition Television) signal processing. It describes the main features of a full ATM Workstation, of ISDN multiservice terminal and digital video broadcast codec connected to ATM node. It presents also the studies on HDTV by simulation of algorithm.
European Transactions on Telecommunications, 1991
A fully digital differential PCM system with adaptive quantization transmitting a speech channel ... more A fully digital differential PCM system with adaptive quantization transmitting a speech channel at 32 kbit/s rate is described. Its performance in terms of subjective and objective measurements are shown and compared with a 64 kbit/s log-PCM system. Two different solutions for the prototype ADPCM 740/58 system at 2.049 Mbit/s ratio are proposed: either to receive two separate PCM streams