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US 8,553,846 B2Granted
Phone test set modem
AssigneeFluke Corporation
InventorsPaul S Swanson, Danny L Maupin
Life of this patent
Estimating the term…
Abstract
A phone test set provides modem capability in a hand held device, enabling bi-directional data communications. Demodulation is provided by sampling digitized incoming phone line signals at 4 times carrier frequency, and employing values representing 0 and 90 degree samples to extract the information signal.
Claims20
A phone test set comprising:
- an A to D converter for receiving incoming phone line signals and providing digitized output of the incoming phone line signals sampled at a multiple of a desired frequency;
- and
- a discriminator receiving said digitized output and multiplying ones of said samples together to extract a signal of interest from said incoming phone line signals.
A method of providing a phone test set with a modem to extract information modulated onto a signal on a phone line, comprising:
- A to D converting an input signal to the phone test set to provide digitized samples of the signal on the phone line to the phone test set;
- providing said digitized samples selected at a multiple of a carrier frequency of interest;
- and
- multiplying ones of said digitized samples representing 90 degree out of phase samples to extract said information modulated onto the signal.
1 more element
A hand held phone test set comprising:
- an A to D converter for receiving incoming signals on a phone line and providing digitized output of the incoming phone line signals sampled at a multiple of a desired frequency;
- and
- a processor receiving said digitized output and implementing a discriminator, multiplying ones of said samples together to extract a signal of interest from said incoming phone line signals, said processor further implementing a threshold detector receiving said extracted signal of interest and providing a binary output representation of said extracted signal of interest, said processor further implementing a universal synchronous/asynchronous receiver/transmitter receiving said binary output representation and providing an ASCII value output represented thereby.
Dependencies are inferred from the claim text.