Title :
A CMOS fully integrated antilarsen system for digital telephones
Author :
Nicollini, G. ; Mazoyer, Y. ; Crippa, C. ; Pernici, S. ; Confalonieri, P.
Author_Institution :
SGS-Thomson Microelectron., Milano, Italy
fDate :
5/1/1993 12:00:00 AM
Abstract :
An integrated CMOS antilarson system that requires no external components is presented. Speech time constants as long as 100 ms are digitally realized. A 12-dB antilarsen depth and a 6-dB hysteresis are provided for the specific application where the system is involved, but both of them and the voice time constants can be register programmed to different values. The extra area added to the chip for the antilarsen function is only 0.5 mm2 in a 1.5-μm CMOS technology
Keywords :
CMOS integrated circuits; codecs; digital communication systems; digital integrated circuits; pulse-code modulation; telephone sets; 1.5 micron; CMOS technology; COMBO chip; Larsen affect suppression; codec/filter chip; digital telephones; howling suppression; integrated antilarsen system; Attenuation; CMOS technology; Coupling circuits; Hysteresis; Loudspeakers; Microphones; Registers; Speech; Telephone sets; Telephony;
Journal_Title :
Solid-State Circuits, IEEE Journal of
