Device for detecting tones on telephone lines

Details Device for detecting tones on telephone lines Device for detecting tones on telephone lines

H - Electricity

04

M

H04M 1/22 (2006.01) H04M 1/21 (2006.01) H04M 1/82 (2006.01) H04M 3/537 (2006.01)

Patent

CA 2067899

Device for detecting and identifying call progress tones on telephone lines. The application discloses a device for converting auditory call progress tones to visual indications and a novel circuit for identifying and distinguishing call progress tones based on their on-off cadence, if any, along with various alternative embodiments including: (1) a device which converts call progress tones to visual indications as for use by the deaf, (2) a device which is programmed to automatically go off- hook at certain times, detect a tone such as a stuttered dial tone indicating a message waiting, and activate a visual indicator, and (3) the use of a capacitor or rechargeable battery which is periodically refreshed by the device automatically going off-hook and which, while the device is on-hook, provides power required by the device.

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