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US 5,347,572 AGranted
Telephone line monitoring apparatus and method
AssigneeTeletron Ltd.
InventorShlomo Avni
Life of this patent
Estimating the term…
Abstract
A fax monitoring apparatus comprises one or more line interface circuits to simultaneously detect and analyze audio signals produced on any given telephone line by two connected fax machines, analyzing circuitry to analyze and interpret the audio signals to form a compressed fax image, expansion circuitry to expand the compressed fax image into a bit-mapped image, memory to store the compressed fax image and/or the bit-mapped image, and display to display the bit-mapped image of the original fax transmission.
Claims7
Fax monitoring apparatus, comprising:
- line interface means connected in parallel to a telephone line for simultaneously detecting and analyzing audio signals produced on the telephone line by two fax machines communicating through the telephone line;
- analysis means for analyzing and interpreting the audio signals to form a compressed fax image;
- expansion means for expanding the compressed fax image into a bit-mapped image;
- storage means for storing the compressed fax image and/or the bit-mapped image;
- and
- display means for displaying the bit-mapped image of the original fax transmission.
3 more elements
A method of monitoring fax communication in a system that includes:
- line interface means connected to a telephone line to be monitored;
- activating means for detecting line activity comprising one of start/stop activity, ringing and dialing pulse and DTMF signalling;
- and interpreting means activated by the activating means, the method comprising the steps of:
- connecting line interface means in parallel to a telephone line for simultaneously detecting and analyzing audio signals produced on the telephone line by two fax machines communicating through the corresponding telephone lines;
- interpreting fax transmission by means of the interpreting means when line activity is detected;
- assembling the interpreted fax transmission into compressed fax images;
- storing the compressed fax images in memory means;
- retrieving the stored compressed fax images and expanding them to bit-mapped images on display means;
- and
- displaying the bit-mapped images on the display means.
7 more elements
Dependencies are inferred from the claim text.