Methods and apparatus for removing NTSC signals from a digital television signal
AssigneeHynix Semiconductor Inc.
InventorJung-Hong Ahn
Life of this patent
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Abstract
A method and apparatus for removing national television system committee (NTSC) signals from a broadcasted datastream including advanced television system committee (ATSC) signals are provided. The apparatus includes an NTSC signal removing unit for removing the NTSC signal from an input signal with one or a plurality of NTSC filtering units; a vestigial sideband (VSB) core unit for generating an error generating signal if the NTSC signal is not removed by the NTSC signal removing unit for a continuous time period of at least a predefined length; and an NTSC filtering selection unit for applying a control signal to select a different one of the NTSC filtering units in response to the continuous error signal output by the VSB core unit.
Claims12
A filter selection apparatus for removing a national television system committee (NTSC) signal from a broadcast datastream, the apparatus comprising:
- an NTSC signal removing unit for removing the NTSC signal from an input signal representative of the broadcast datastream, the NTSC signal removing unit including a first filter and a second filter;
- a vestigial sideband (VSB) core unit for detecting at least one NTSC signal in an output of the NTSC signal removing unit, and for generating an error signal if an NTSC signal is detected;
- and
- an NTSC filtering selection unit for selecting one of an equalizer, the first filter and the second filter in response to the error signal output by the VSB core unit.
A method of removing national television system committee (NTSC) signals from a broadcast datastream including an advanced television system committee (ATSC) signal, the method comprising the steps of:
- a) removing the NTSC signal from an input signal representative of the broadcast datastream, the NTSC signal removing unit including a first filter and a second filter;
- b) detecting at least one NTSC signal in an output of the step a), and for generating an error signal if an NTSC signal is detected;
- and
- c) selecting one of an equalizer, the first filter and the second filter in response to the error signal.
A method of removing national television system committee (NTSC) signals from a broadcast datastream including an advanced television system committee (ATSC) signal, the method comprising the steps of:
- a) processing an input signal with an equalizer when initializing a vestigial sideband (VSB) core unit;
- b) determining if a signal output by the equalizer contains NTSC signals;
- c) if the signal output by the equalizer contains NTSC signals, selecting a first one of a first filter and a second filter to process the input signal into a processed signal;
- d) if after step c), the signal output by the equalizer contains NTSC signals, selecting a second one of the first filter and the second filter to process the input signal into a processed signal;
- e) if the processed signal still includes NTSC signals even though each of the equalizers, the first filter and the second filter, have been sequentially tried, selecting a last one of the equalizer, the first filter and the second filter;
- and
- f) if after selecting the least one of the equalizer, the first filter and the second filter, if the signal output by the last of the equalizer, the first filter and the second filter one contains NTSC signals for a predetermined time period, resetting a frame counter.
Dependencies are inferred from the claim text.