Control signal generation method in digital satellite equipment control

Abstract

The invention discloses a method for generating a control signal in the digital satellite device control (DiSEqC), which comprises the following steps: the central processor, according to the potential flow sequence corresponding to a control instruction, controls a switching / non-switching of a carrier signal connected with an inputting / outputting pin of the central processor using an interruption of a timer. Then a logic high or a logic low in the outputted potential flow sequence is modulated into the carrier signal and formed into a pulse width keying signal of a subordination device controlled by the digital satellite device. Wherein, the potential flow sequence comprises data bits of a byte in each control instruction and parity bits of each byte; the central processor starts to output a potential flow from a highest bit of a byte in a control instruction, after shifting a bit to the left, then outputs the potential flow of the data bit of the byte. By applying the invention, the generated control instruction of the DiSEqC can be exactly controlled, thus increasing the stability of controlling the DiSEqC.

Description

technical field [0001] The present invention relates to a television receiver, and more particularly to a control signal generation method in a digital satellite equipment control (DiSEqC) for controlling external equipment in a television receiver. Background technique [0002] Digital Satellite Equipment Control (Digital Satellite Equipment Control, DiSEqC) is used in digital satellite TV receivers (set-top boxes), controlled by the TV receiver, and sends control commands to corresponding external devices, such as switches, switchers, antenna drive equipment, LNB tuner, etc., to control external equipment. The working process of DiSEqC is that under the cooperation of the synchronous clock pulse inside the digital satellite TV receiver, through the coaxial cable connected to the LNB tuner, the digital signal modulated alternately at 22KHz frequency is serialized in the form of a modulated carrier. Line transfer related control instructions. Typically, this modulated carr...

AI Technical Summary

Problems solved by technology

It takes time to execute the above tasks, and when the execution conditions are not mature, the TV receiver will first execute the tasks with high priority; at the same time, the length of a control command is generally 3 to 5 bytes, if the generated control command signal time length It is not equal to the calculation time. In the process of generating the control command signal, the TV receiver is likely to generate gaps between the bytes of the control command data, resulting in instability.

Although the TV receiver adopts the method of retransmitting the control command signal to reduce the probability of signal error, the error of the control command signal is still inevitable

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