Communication apparatus including a mechanism for preventing...

Details Communication apparatus including a mechanism for preventing... Communication apparatus including a mechanism for preventing...

2007-10-02

2007-10-02

Gelin, Jean (Department: 2617)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S309000, C455S550100

Reexamination Certificate

active

11170548

ABSTRACT:
A communication apparatus includes a mechanism for preventing demodulation of text telephone information during reception of a poor quality signal. In one embodiment, the communication apparatus includes a receiver including a demodulator unit configured to receive a signal including a plurality of text telephone symbols. The demodulator unit may be configured to generate a soft decision based upon a frequency and an energy value of each received text telephone symbol. The demodulator unit may be configured to receive a notification that indicates the signal is unusable. In response to receiving the notification, the demodulator unit may be further configured to generate predetermined information that is independent of the plurality of text telephone symbols.

REFERENCES:
patent: 6075841 (2000-06-01), Engelke et al.
patent: 6434198 (2002-08-01), Tarraf
patent: 2002/0057765 (2002-05-01), Hyziak
patent: 2003/0053603 (2003-03-01), Vejlgaard
patent: 2005/0170820 (2005-08-01), Shiomi et al.
patent: 2005/0237980 (2005-10-01), Melhuish
patent: 2005/0268198 (2005-12-01), Marke et al.
patent: 2006/0023848 (2006-02-01), Mohler

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