Broadcast receiver and channel searching method using the same
AssigneeLG Innotek Co., Ltd.
InventorHyun Woo Lim
Life of this patent
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Abstract
Disclosed is a broadcast receiver. The broadcast receiver comprises a signal receiver for tuning and outputting a Q channel of a digital broadcasting signal, a demodulator for demodulating a signal of the received channel and checking a lock state M or an unlock state of a gain control signal and a timing control signal of the channel, and a demodulation controller for controlling o an operation of the demodulator and detecting a lock state of the channel based on the lock state of the gain control signal and the timing control signal.
Claims17
A broadcast receiver comprising:
- a signal receiver for tuning and outputting a channel of a digital broadcasting signal;
- a demodulator for demodulating a signal of the received channel and checking a lock state or an unlock state of a gain control signal and a timing control signal of the channel;
- and
- a demodulation controller for controlling an operation of the demodulator and detecting a lock state of the channel based on the lock state of the gain control signal and the timing control signal;
- wherein the demodulation controller checks a lock state of an automatic gain control signal and a lock state of a timing recovery loop to skip a channel signal in an unlock state, and then searches for a subsequent channel.
A broadcast receiver comprising:
- a signal receiver for tuning a signal of a digital cable broadcasting channel and converting the signal into an intermediate frequency;
- a demodulator for demodulating a signal of the channel and checking a lock state of the channel by using automatic gain control and timing recovery loop signals of the received channel;
- a storage unit for storing channel information;
- and
- a demodulation controller for storing channel information, which is generated by the demodulator based on the lock state of the channel, in the storage unit;
- wherein, when the automatic gain control and timing recovery loop signals of the received channel are in an unlock state, the demodulation controller skips the channel and controls the signal receiver to tune a subsequent channel.
A channel search method of a broadcast receiver, the method comprising the steps of:
- tuning a channel of a digital broadcasting signal;
- demodulating a signal of the channel;
- checking a lock state or an unlock state of the channel according to signal intensity of the tuned channel and signal timing;
- storing one channel of a digital broadcasting format when the channel is in a lock state;
- and
- skipping the channel and searching for a subsequent channel when the channel is not in the lock state;
- wherein the channel in the unlock state includes a channel having no digital broadcasting signal or an analog broadcasting channel.
Dependencies are inferred from the claim text.