Datum line drifting correcting devices and methods thereof

Abstract

The invention discloses a drift correction device for a datum line and a method thereof, which are used for correcting the drift of the datum line. The correction device comprises a differentiator for differencing a data signal to generate a differential signal, a computation module coupled with the differentiator for calculating the data signal on the basis of the differential signal to generate a computation signal, a capture module coupled with the computation module for determining the first critical value and the second critical value according to the computation module, a comparison module coupled with the capture module for comparing the computation signal respectively based on the first critical value and the second critical value so as to generate the first processing signal and the second processing signal, and a latch module coupled with the comparison module for latching the first processing signal and the second processing signal to generate an output signal. The device and the method of the invention can be used for correcting the datum line drift which is caused by a transmitter / a receiver in a wireless delivery system.

Description

technical field [0001] The present invention relates to a correction device and method, and more particularly to a baseline wandering correction device and method. Background technique [0002] In the wireless transmission system, the problem of baseline wandering at the receiver end will cause the receiver to output wrong signals, which will cause the entire wireless transmission system to fail to operate normally. A problem that has been trying to solve for a long time. [0003] In the Bluetooth transmission system, the Gaussian Frequency Shift Keying (GFSK) module is usually used for signal modulation. Because of the influence of RX IF filtering and demodulator ISI, the filter transient The drift of the reference line or the local oscillator frequency of the transmitting and receiving ends can cause the problem of the drift of the reference line. [0004] There are several ways to solve the baseline drift in the past, one of which is to use a special encoding method to ...

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Problems solved by technology

[0002] In a wireless transmission system, the problem of baseline wandering at the receiver will cause the receiver to output an error signal, which will cause the entire wireless transmission system to fail to operate normally. Therefore, this phenomenon of baseline wandering is an industry Problems that have been tried for a long time

[0003] In the Bluetooth transmission system, the Gaussian Frequency Shift Keying (GFSK) module is usually used for signal modulation, because of the influence of RX IF filtering and demodulator ISI, the filter transient The drift of the baseline or the frequency drift of the local oscillator at the transmitting and receiving end will cause the problem of drifting of the baseline

[0004] There are several ways to solve the baseline drift in the past, one of which is to use a special coding method, such as Return to zero (RZ) coding or Manchester (Manchester) coding, the transmitted data stream ( stream) will not contain the DC part, so the problem of baseline drift can be improved, but using this method will sacrifice the usable fundamental frequency width, and there is no way to solve all the problems in the Bluetooth transmission system

[0005] Another method is to use AC coupling to achieve AC coupling (AC coupling) to the next-level circuit. The signal will re-store its own DC level, thereby removing the DC baseline drift. phenomenon, but when the signal contains DC components, this method cannot be realized, so this method will have a time limit for use

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