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Multi-broadcast channel selection apparatus

A channel selection, intermediate frequency technology, used in continuous tuning, TV, electrical components, etc., can solve problems such as poor images, inaccurate reception of broadcast signals, and sound quality degradation

Inactive Publication Date: 2002-08-21
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
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Problems solved by technology

In addition, due to technical difficulties, this adjustment cannot be accurately satisfied. Therefore, even if an NTSC signal is obtained, only a bad image can be obtained.
Finally, existing channel selection devices do not accurately receive the corresponding broadcast signal
[0011] Also, in the above-mentioned existing channel device, the sensitivity of the sound signal passing through the mixer 10 varies according to various broadcasting systems when the sound signal is controlled, and the sound of the stereo broadcast using a group of carriers is different. Significant deterioration in quality

Method used

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Embodiment Construction

[0029] A preferred embodiment of the present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 4 It is a block diagram showing a multi-broadcast channel selection device according to the present invention. Figure 4 The channel selection device includes a tuner 22 for channel selection, a video signal processing circuit 20, and a sound signal processing circuit 30 connected to the output of the tuner 22 for demodulating video signals and sound signals, respectively. As in the prior art, if a channel signal is received through a receiving antenna 21, the channel signal selected by the tuner 22 is converted into a low frequency and into an intermediate frequency IF.

[0031] The video signal processing circuit 20 and the sound signal processing circuit 30 respectively include an amplifier, a SAW filter or a plurality of SAW filters, and a detector. In this way, the video and sound signals included in the intermediate frequency I...

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Abstract

A channel selection apparatus is provided for allowing receipt of signals broadcast according to the NTSC, SECAM and PAL broadcast modes. A controller discriminates the signal's broadcast mode based on the horizontal sync signal included in the received signal and alters a circuit connection path. Accordingly, a desired broadcast mode can be automatically selected without requiring any particular switch manipulation by a user. Further, a video signal processing path is separated from a sound signal processing path, in order to obtain excellent sound quality, even when receiving a stereo broadcast. Also, it is possible to easily automate the manufacturing process for the apparatus, thereby improving productivity.

Description

Technical field [0001] The present invention relates to a channel selection device for receiving broadcast signals such as NTSC, SECAM and PAL broadcasting systems, and more particularly to a device for identifying horizontal synchronization signals from video signal components received by a receiving device and receiving various broadcasts Signal multi-broadcast channel selection device. Background technique [0002] Currently, commercial broadcast signals are roughly divided into NTSC, PAL, and SECAM broadcast systems and corresponding carriers according to the bandwidth of each channel. These three broadcast systems provide excellent images, and it is difficult for users to distinguish them visually. Each broadcasting system has its own unique characteristics. [0003] Figure 1A to 1D Shows the spectrum applicable to the corresponding broadcasting system. Here, fp represents the video frequency, fc represents the color signal frequency, and fs represents the sound frequency....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03J3/00H04N5/46
CPCH04N5/46H03J3/00
Inventor 罗一球
Owner SAMSUNG ELECTRONICS CO LTD
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