Telecommunications – Transmitter and receiver at same station – Convertible
Patent
1995-11-02
1997-11-18
Vo, Nguyen T.
Telecommunications
Transmitter and receiver at same station
Convertible
455142, 4552261, 375216, H04B 140, H04L 2500, H04L 2700
Patent
active
056898169
ABSTRACT:
In accordance with IS-136 standard, an analog wireless signal and a digitally encoded wireless signal can be received by a remote telecommunicating device. The remote device can differentiate between the analog wireless signal and the digitally encoded wireless signal by measuring the average energy of the signal in the portion of the baseband signal that is expected to contain the Supervisory Audio Tone signal, and the portion of the baseband signal that is expected to be outside of the audio band for an analog signal. The average energy of the portion outside of the audio band is subtracted from the average energy of the SAT signal. The difference is compared to a threshold, and based upon the comparison, the characteristic of the received wireless signal, i.e. analog or digital, is determined.
REFERENCES:
patent: 5400368 (1995-03-01), Cheng et al.
patent: 5418815 (1995-05-01), Ishikawa et al.
patent: 5436942 (1995-07-01), Cheng et al.
patent: 5438595 (1995-08-01), Cheng et al.
patent: 5491726 (1996-02-01), Cheng et al.
patent: 5598430 (1997-01-01), Hachisuka et al.
Cheng Jong-Keung
Lee Tony Siuman
Atmel Corporation
Vo Nguyen T.
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