Interface apparatus for effecting captioning and communications between a telephone line and a television
First Claim
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1. A captioning unit for use with a television receiver comprising:
- a modem for receiving and transmitting digital data over a telephone subscriber loop and for providing telecommunications device for the deaf (TDD) data and operation;
a composite video signal source;
an analog video processor, coupled to the composite video signal source, for slicing hidden caption data in a vertical blanking interval, separating sync data from the composite video signal and selectively overlaying the caption and TDD data on the composite video signal;
a digital decoder and display processor, having inputs coupled to the analog video processor for decoding the caption data and having an output for inserting data from a volatile memory representative of luminance and chrominance information of the caption and TDD data;
link interface means, coupled to the modem, for isolating the modem from the telephone subscriber loop and for detecting rings; and
a CPU coupled to the modem, the display processor, the link interface means and the memory, for setting selective display modes for answering, announcing unavailability, and recording an incoming message in response to a preselected number of rings, for displaying an icon to alert that an incoming call is being received and to indicate that a message has been left.
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Abstract
A telecommunications device is disclosed which provides TDD services for the hearing impaired as well as other closed-captioning services. Incoming data is displayed over the television picture and may be stored in memory for review by the receiving party at a later time if desired.
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Citations
16 Claims
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1. A captioning unit for use with a television receiver comprising:
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a modem for receiving and transmitting digital data over a telephone subscriber loop and for providing telecommunications device for the deaf (TDD) data and operation; a composite video signal source; an analog video processor, coupled to the composite video signal source, for slicing hidden caption data in a vertical blanking interval, separating sync data from the composite video signal and selectively overlaying the caption and TDD data on the composite video signal; a digital decoder and display processor, having inputs coupled to the analog video processor for decoding the caption data and having an output for inserting data from a volatile memory representative of luminance and chrominance information of the caption and TDD data; link interface means, coupled to the modem, for isolating the modem from the telephone subscriber loop and for detecting rings; and a CPU coupled to the modem, the display processor, the link interface means and the memory, for setting selective display modes for answering, announcing unavailability, and recording an incoming message in response to a preselected number of rings, for displaying an icon to alert that an incoming call is being received and to indicate that a message has been left. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A self contained electronic unit coupled to a standard telephone subscriber loop and between a radio frequency (RF) signal source and a RF input on a television receiver comprising:
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(a) a TV tuner for receiving a RF signal TV broadcast and providing a composite video signal output; (b) a line interface coupled between the telephone subscriber loop and a modem for isolating the modem from the subscriber loop and for properly terminating the subscriber loop in response to a predetermined number of rings and detection of a data carrier signal; (c) an analog video processor, coupled to the TV tuner, for slicing VBI caption data and for separating sync data from the composite video signal; (d) a digital decoder and display processor, coupled to the analog video processor, for receiving the vertical blanking interval (VBI) caption data and sync signals and for routing synchronized pixel information representative of caption or telecommunications device for the deaf (TDD) data to the analog video processor for mixing into composite video signal output; (e) a TV modulator, coupled to the analog video processor, for modulating the mixed video signal at a RF frequency; and (f) a CPU for performing general overhead including parity checking in the data, interpreting control and color codes, for answering announcing unavailability, and recording an incoming message in response to a preselected number of rings, and in response to detecting a modem carrier signal, activating a wake-up relay for switching an AC power outlet on. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification