Method and device for receiving and decoding analog television signals
An analog TV and signal technology, applied in the field of receiving and decoding methods and devices for analog TV signals, can solve the problems of increasing the implementation area and cost, affecting the accuracy of the analog-to-digital converter 105, reducing the sensitivity of analog TV receiving equipment, etc., and saving PLL. The effect of the circuit
Inactive Publication Date: 2014-02-12
INNOFIDEI TECHNOLOGIES INC
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Problems solved by technology
For mobile devices, due to the multipath effect caused by complex environments such as buildings during the movement process, and the fast movement will cause Doppler (doppler) and other effects, and the signal-to-noise ratio (SNR) changes greatly, the extracted The clock frequency will have a large jitter, and the jitter of the clock frequency will further affect the accuracy of the analog-to-digital converter 105 and reduce the sensitivity of the analog TV receiving device
In addition, after the clock restorer 108 extracts the clock signal synchronized with the TV station, it needs to generate the clock required by the image decoder 110 and the sound decoder 109 at the same time, and the clock frequency required by the image decoder 110 and the sound decoder 109 is different. Again, this requires a phase-locked loop (PLL) circuit to adjust the clock frequency accordingly, increasing implementation area and cost
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[0041] The device for receiving analog TV signals in a digital-analog hybrid mode proposed by an embodiment of the present invention is as follows: figure 2 shown, with figure 1 The structure of the device is different, figure 2 The analog-to-digital converter 205, the demodulator 206, and the sound decoder 209 all use the local clock signal output by the local clock generator 207 to improve the front-end processing accuracy; only the image decoder 210 uses the analog clock signal recovered by the clock restorer 208. TV signal transmitter clock signal to ensure stable and normal image decoding output.
[0042] After the analog TV signal received by antenna 201 is processed by filter 202, low-noise amplifier 203 and zero-IF converter 204 in turn, the following processing is carried out:
[0043] Using the local clock signal of the receiving end to sequentially perform analog-to-digital conversion on the analog television signal to obtain a digitized analog television signal...
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The invention provides a method for receiving and decoding analog television signals. The method comprises the following steps: after analog television signals received by an antenna are processed successively by a filter, a low noise amplifier and a zero intermediate frequency converter, the analog television signals are subjected to analog-to-digital converting and demodulating successively by adopting the local clock signal of the receiving terminal, and the demodulated CVBS (composite video broadcast signal) is obtained; and the CVBS sampling rate is converted so as to be matched with a recovering launch pad clock, then by adopting the signal of the recovering launch pad clock, the CVBS is decoded and an image is obtained and output. The invention also provides a device for receiving and decoding the analog television signals. By adopting the invention, the effect of degraded image decoding caused by moving can be lessened so that the accuracy of receiving and decoding the analog television signals is improved.
Description
technical field [0001] The invention relates to the technical field of analog television signals, in particular to a method and device for receiving and decoding analog television signals. Background technique [0002] As a mature technical standard, the analog TV standard has existed for quite a long time and has been widely used. The analog TV receiving equipment needs to receive and process the TV signals from the analog signal transmitters of each TV station in real time, so as to realize the synchronous playback of analog TV programs. Traditional analog TV receiving equipment lacks a single processing chip, and requires multiple analog processing modules such as tuners, demodulators, and decoders. It is large in size and consumes a lot of power, so it is mainly used in household consumer appliances, that is, common household color TVs . [0003] With the rapid development of CMOS technology, it is possible to provide a single chip solution for analog TV reception. The...
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IPC IPC(8): H04N5/44H04N5/21H04N21/426
Inventor 张辉王西强杨利钱炜吕悦川李雪松
Owner INNOFIDEI TECHNOLOGIES INC