Title :
Transmission of data on analog speech channel by spread spectrum modulation
Author :
Suzuki, Jouji ; Hingdi, Bai ; Yashima, Hiroyuki
Author_Institution :
Sch. of Sci. & Technol., Saitama Univ., Urawa, Japan
Abstract :
Sometimes it is requested to transmit data together with speech signal through a telephone channel. This paper proposes that low bit-rate of digital data are spread over a speech signal and transmitted through an analog telephone channel. In this method, the speech signal acts as noise for the data channel, and the digital signal acts as noise for the speech channel. Direct sequence modulation is employed for data transmission. A data rate of 22 bps is achieved at the BER of 10-3 when the noise is almost not perceived
Keywords :
data communication; modulation; pseudonoise codes; spread spectrum communication; telephony; voice communication; 22 bit/s; analog speech channel; analog telephone channel; data transmission; digital data; direct sequence modulation; low bit-rate; speech signal; spread spectrum modulation; telephone channel; Band pass filters; Bit error rate; Circuits; Frequency shift keying; Pulse modulation; Signal to noise ratio; Space vector pulse width modulation; Speech enhancement; Spread spectrum communication; Telephony;
Conference_Titel :
Communications, Computers and Signal Processing, 1997. 10 Years PACRIM 1987-1997 - Networking the Pacific Rim. 1997 IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-3905-3
DOI :
10.1109/PACRIM.1997.620355
