Data detection circuit for a TASI system

Details Data detection circuit for a TASI system Data detection circuit for a TASI system

1980-01-24

1982-02-02

Atkinson, Charles E.

179 1VC, 179 1P, G10L 100

Patent

active

043141005

ABSTRACT:
Disclosed is a circuit for determining whether an incoming signal is a speech signal or a data signal. In the preferred embodiment, means for separating the incoming signal into a low frequency component and a high frequency component are provided. The low frequency component consists of frequencies below a specified frequency, namely 1000 Hz. and the high frequency component consists of frequencies above 1000 Hz. Means are also provided for the comparison of the energy level of the high frequency components with a multiple of the energy level of the low frequency components. Also, means are provided for comparing a multiple of the energy level of the low frequency components with a maximum threshold and for comparing the energy level of the high frequency components with a minimum threshold. Further, means are provided for detecting whether the incoming signal has a slope. Data is determined to be present when the energy level of the high frequency components exceeds a multiple of the energy level of the low frequency components, and when the energy of the low frequency components is less than a maximum threshold and when the energy level of the high frequency components is greater than a minimum threshold and when the incoming wave has no slope all occurring simultaneously for a preselected period of time.

REFERENCES:
patent: 3304372 (1967-02-01), Filipowsky et al.
patent: 3985956 (1976-10-01), Monti et al.
patent: 4001505 (1977-01-01), Araseki et al.
patent: 4027102 (1977-05-01), Ando et al.
patent: 4057690 (1977-11-01), Vagliani et al.
patent: 4061878 (1977-12-01), Adoul et al.

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