KR102041193B1 - Method for processing signal - Google Patents

Abstract

The present invention relates to a signal processing apparatus and a signal processing method using the same. More particularly, the present invention relates to a signal processing apparatus for receiving an analog signal and converting the same into a digital signal, and a signal processing method using the same. According to an embodiment of the present invention, the signal processing method comprises the processes of: outputting an input signal including an analog signal to a main path and an auxiliary path different from the main path, respectively; detecting a signal level of an input signal output from the auxiliary path; selecting one of a plurality of analog-to-digital conversion paths arranged in parallel on the main path according to the detected signal level of the input signal; and converting an input signal into a digital signal via the selected analog-to-digital conversion path.

Description

Signal processing method {METHOD FOR PROCESSING SIGNAL}

The present invention relates to a signal processing apparatus and a signal processing method using the same, and more particularly, to a signal processing apparatus for receiving an analog signal and converting it into a digital signal and a signal processing method using the same.

A digital receiver is a device that converts an analog signal received through an analog digital converter (ADC) into a digital signal and extracts desired information from the received signal by applying digital signal processing technology.

The performance of such a digital receiver is greatly affected by the high speed processing of the signal and the dynamic range. At this time, the dynamic range of the digital receiver is largely dependent on the dynamic range of the analog-to-digital converter.

That is, the analog-to-digital converter converts the analog signal into a digital signal for a received signal having a level between the lowest signal level (or magnitude, strength) of the dynamic range and the highest signal level. In this case, when an analog signal having a signal level outside the dynamic range of the analog-to-digital converter (hereinafter, referred to as saturation level) is input, the analog-to-digital converter operates in a nonlinear period, causing distortion of the output signal.

In addition, when the digital receiver receives a signal having a variable signal level, the analog-to-digital converter must be able to accommodate all signal levels of the received signal.

However, a digital receiver mounted on an active phased array radar or the like receives a signal reflected from a target according to the beam steering angle, and thus the intensity and signal level are changed according to the beam steering change, the target type, and the detection distance. It changes dramatically.

In this case, the conventional digital receiver has a problem in that when an analog signal having a saturation level is input, an output signal is distorted, and thus it is impossible to extract desired information such as a distance and a Doppler value from the received signal. As a result, conventional digital receivers do not know the signal resources such as signal strength, frequency, distance measurement, Doppler measurement, etc., which is accurate for received signals including radar, communication and electronic warfare fields. It can have fatal consequences in areas where analysis is required.

KR 10-2009-0128255 A

The present invention provides a signal processing apparatus capable of converting a digital signal without distortion or loss even when an analog signal outside the dynamic range of the analog to digital converter is received, and a signal processing method using the same.

In accordance with another aspect of the present invention, a signal processing method includes: outputting an input signal including an analog signal to a main path and an auxiliary path different from the main path; Detecting a signal level of an input signal output from the auxiliary path; Selecting one of a plurality of analog-digital conversion paths arranged in parallel on the main path according to the sensed signal level of the input signal; And converting an input signal into a digital signal via the selected analog to digital conversion path.

In the detecting of the signal level of the input signal, the signal level of the input signal may be converted into a voltage value and output as a received signal strength index (RSSI).

The plurality of analog digital paths include a first analog-digital conversion path including attenuators for attenuating signal levels of the input signal and first analog-digital converters for converting signals output from the attenuators into digital signals. ; And a second analog to digital conversion path in which an amplifier for amplifying a signal level of the input signal and a second analog to digital converter for converting a signal output from the amplifier into a digital signal are sequentially arranged.

The selecting of one of the plurality of analog-to-digital conversion paths may include selecting the first analog-to-digital conversion path if the signal level of the input signal is greater than a first threshold value and the signal level of the input signal is a second threshold value. If smaller than the value, the second analog-to-digital conversion path may be selected.

The first threshold value may be smaller than the second threshold value.

The converting of the input signal into a digital signal may include: connecting the amplifier to ground and selecting the analog-to-digital conversion path when the first analog-to-digital conversion path is selected in the process of selecting the analog-to-digital conversion path. In the case where the second analog-to-digital conversion path is selected, the attenuator may be connected to ground.

The converting of the input signal into a digital signal may include increasing an attenuation amount of the attenuator when the signal input to the first analog to digital converter is out of the dynamic range of the first analog to digital converter, When the signal input to the outside the dynamic range of the second analog to digital converter, the amplification amount of the amplifier can be increased.

According to the signal processing apparatus and the signal processing method using the same according to an embodiment of the present invention, the performance is reduced by the inter-channel interference by selecting the path to which the input signal including the analog signal is transmitted by the main switch unit and converting it into a digital signal And errors in path selection can be prevented.

In addition, by selecting a path for converting the input signal according to the signal level of the input signal, not only can the additional signal processing time be shortened, but also the signal according to the signal constraint by determining whether the digital converter is saturated using the overflow bit. Distortion can be minimized.

In addition, according to the signal processing apparatus and the signal processing method using the same according to an embodiment of the present invention, by controlling the gain of the attenuator for attenuating the signal level of the input signal and the amplifier for amplifying the signal level of the input signal in real time Performance degradation due to saturation of the component parts can be prevented.

1 shows a general signal processing apparatus;
2 is a diagram illustrating a signal processing apparatus according to an exemplary embodiment of the present invention.
3 is a diagram illustrating a first analog-digital converter according to an embodiment of the present invention.
4 is a view showing a second analog-digital converter according to an embodiment of the present invention.
5 is a diagram illustrating a first analog-to-digital converter connected to a signal branch on a main path;
6 is a view showing a second analog-to-digital converter connected to a signal branch on a main path;
7 is a diagram illustrating a signal processing method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments of the present invention make the disclosure of the present invention complete and the scope of the invention to those skilled in the art. It is provided to inform you completely. Like numbers refer to like elements in the figures.

1 is a diagram illustrating a general signal processing apparatus.

Referring to FIG. 1, a general signal processing apparatus includes an antenna 10 for receiving an analog signal, an analog signal processor 20 for processing a received analog signal, an analog-to-digital converter 30 for converting an analog signal into a digital signal, and It consists of a digital signal processor 40 for processing digital signals.

Here, the processing of the analog signal means preprocessing to prevent distortion of the output signal from the analog-to-digital converter 30, and out of the dynamic range of the analog-to-digital converter 30 by such pre-processing. An analog signal having a signal level (hereinafter referred to as saturation level) is restricted from being input to the analog-to-digital converter 30.

That is, the analog signal processor 20 may determine a signal level (amplitude, strength, magnitude, etc.) of an input signal having a saturation level out of the dynamic range of the analog-digital converter 30 among the input signals input to the analog signal processor 20. Restrict. The analog signal processor 20 is generally composed of a gain control circuit and a limiter circuit disposed in front of the analog-digital converter 20.

However, when the signal level of the input signal is limited by the gain control circuit and the limiter circuit, there is a problem that it takes additional signal processing time to continuously measure the signal level of the input signal and limit it according to the measured signal level. have. In addition, the limiter circuit has a problem in that signal distortion occurs due to signal limitation.

Accordingly, a signal processing apparatus and a signal processing method using the same provide technical features that can minimize signal distortion without requiring additional signal processing time, and according to an embodiment of the present invention. A signal processing apparatus and a signal processing method using the same will be described in detail.

2 is a diagram illustrating a signal processing apparatus according to an exemplary embodiment of the present invention. 3 is a diagram illustrating a first analog-to-digital converter 300 according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating a second analog-digital converter 400 according to an embodiment of the present invention.

2 to 4, a signal processing apparatus according to an exemplary embodiment of the present invention may include an input signal including an analog signal as a main path M and an auxiliary path S different from the main path M, respectively. A signal branch part 100 for outputting; A plurality of analog and digital converters disposed in parallel on the main path M and converting an input signal into a digital signal; A main switch 200 for selectively connecting the plurality of analog-digital converters to the signal branch unit 100 on the main path M; A signal detector 600 connected to the auxiliary path S to detect a signal level of the input signal; And a controller 500 for controlling the connection of the main switch 200 according to the signal level of the input signal sensed by the signal detector 600.

The signal processing apparatus according to an embodiment of the present invention is connected to a rear end of an antenna (not shown) for receiving an analog signal, and converts an input signal including the received analog signal into a digital signal. Hereinafter, the front end means a position where the signal is processed first on the movement path of the signal, and the rear end means a position where the signal is processed later on the movement path of the signal.

The signal branch unit 100 outputs an input signal including an analog signal to a main path M and an auxiliary path S different from the main path M, respectively. Here, the signal branch unit 100 may use a divider that directly divides and distributes an input signal, but includes a directional coupler to block the signal output to the main path (M) from flowing into the auxiliary path (S). It can be configured as.

The directional coupler is used when the two waveguides are properly combined or two lines are separated to separate signals according to directions. By using the directional coupler as the signal branch 100, the input signal is divided by the directional coupler into the main path. Although output to M) and the auxiliary path (S), respectively, the signal output through the directional coupler to the main path (M) can not enter the auxiliary path (S). In this way, by using the directional coupler as the signal branch 100, the isolation between the main path (M) and the auxiliary path (S) is improved, and the signal detection unit 600 to be described later to correct the signal level of the input signal It can be detected.

The plurality of analog to digital converters are disposed in parallel on the main path M to convert an input signal including an analog signal into a digital signal. That is, the plurality of analog-to-digital converters are arranged in parallel on the main path M to form analog-to-digital conversion paths, respectively, and the analog-to-digital conversion paths are output from the signal branch unit 100 to the main path M, respectively. It forms the path of signal transmission.

Here, the plurality of analog-to-digital converters may include a first analog-digital converter 300 for attenuating and converting a signal level of an input signal and a second analog-to-digital converter 400 for amplifying and converting a signal level of an input signal. It may include.

The first analog to digital converter 300 is a signal level of the signal output from the signal branch unit 100 is outside the dynamic range of the first analog to digital converter 340 (for example, the first analog to digital converter 340) Is greater than the highest signal level in the dynamic range of?), The signal level of the signal output from the signal branch section 100 is attenuated and converted into a digital signal. In addition, the second analog-to-digital converter 400 may output the signal level of the signal output from the signal branch unit 100 outside the dynamic range of the second analog-to-digital converter 440 (for example, the second analog-to-digital converter ( If smaller than the highest signal level belonging to the dynamic range of 440), the signal level of the signal output from the signal branch unit 100 is amplified and converted into a digital signal.

Accordingly, the first analog-to-digital converter 300 may further include an attenuator 310 for attenuating the signal level of the signal output from the signal branch unit 100 and a signal for converting the signal output from the attenuator 310 into a digital signal. The first analog to digital converter 340 may be included.

An attenuator 310 attenuates the signal level of the signal output from the signal branch 100. The attenuator 310 may be configured as a resistance circuit, and various configurations may be applied to reduce only the signal level (amplitude, strength, magnitude, etc.) without changing the waveform of the signal. A detailed description thereof will be omitted. Let's do it.

The first filter 330 may be connected to the rear end of the attenuator 310. The first filter 330 removes unwanted waves from the signal output from the attenuator 310, and may use a band pass filter (BPF).

The first analog to digital converter 340 converts the signal output from the attenuator 310 with the signal level reduced to a digital signal. The first analog to digital converter 340 may be connected to a rear end of the first filter 330, and the first analog to digital converter 340 may be implemented as at least one analog to digital converter (ADC) element.

In addition, the first analog-to-digital converter 300 according to the embodiment of the present invention may be arranged in parallel with the first analog-digital converter 340 and the first terminal circuit 350 and the attenuator 310 may be grounded. The apparatus may further include a first switch 320 for selectively connecting the analog to digital converter 340 or the first termination circuit 350. Here, the first termination circuit 350 may be configured to have a termination resistance of 50Ω as a configuration for grounding one terminal of the first switch 320.

As such, when the first analog-to-digital converter 300 further includes the first termination circuit 350 and the first switch 320, the controller 500 may be connected to the signal branch unit 100 by the second analog-digital converter. The main switch 200 and the first switch 320 may be controlled to connect the 400 to the attenuator 310 so that the first termination circuit 350 is connected to the attenuator 310. It will be described later with reference to.

On the other hand, the second analog-to-digital converter 400 is an amplifier 410 for amplifying the signal level of the signal output from the signal branch unit 100 and for converting the signal output from the amplifier 410 into a digital signal The second analog to digital converter 440 may be included.

An amplifier 410 amplifies the signal level of the signal output from the signal branch 100. The amplifier 410 may be composed of an OP-AMP, a transistor, and the like, and various configurations that increase only a signal level (amplitude, strength, magnitude, etc.) without changing the waveform of the signal may be applied. The description will be omitted.

The second filter 430 may be connected to the rear end of the amplifier 410. The second filter 430 is used to remove the unwanted wave from the signal output from the amplifier 410. Like the first filter 330, a band pass filter (BPF) may be used.

The second analog-to-digital converter 440 converts the signal output by increasing the signal level from the amplifier 410 into a digital signal. The first analog to digital converter 340 may be connected to a rear end of the first filter 330, and the second analog to digital converter 440 may be the same as the first analog to digital converter 340. ) May be implemented as an element. Here, the first analog to digital converter 340 and the second analog to digital converter 440 may be the same configuration or a configuration having similar performance.

In addition, the second analog-to-digital converter 400 according to the embodiment of the present invention may be disposed in parallel to the second analog-to-digital converter 440 to the second termination circuit 450 and the amplifier 410 that are grounded. A second switch 420 may be further included to selectively connect the analog to digital converter 440 or the second termination circuit 450. Here, the second termination circuit 450 is configured to ground one terminal of the second switch 420, and may be configured to have a termination resistance of 50 Ω similarly to the first termination circuit 350.

As such, when the second analog to digital converter 400 further includes the second termination circuit 450 and the second switch 420, the controller 500 may be connected to the signal branch unit 100 by the first analog to digital converter. The main switch 200 and the second switch 420 may be controlled to connect the 300 to the amplifier 410 and to connect the second termination circuit 450 to the amplifier 410. It will be described later with reference to.

The main switch 200 selectively connects the above-described plurality of analog-digital converters to the signal branch unit 100 on the main path M. That is, the main switch 200 selects a transmission path of a signal output from the signal branch unit 100 with respect to the plurality of analog digital conversion paths formed by the plurality of analog digital converters.

The signal detector 600 is connected to the auxiliary path S to detect a signal level of the input signal. Here, the signal detection unit 600 may be configured as a diode and convert the signal level of the signal output through the auxiliary path S into a voltage value and output the converted signal as a received signal strength index (RSSI).

The controller 500 controls the aforementioned connection of the main switch 200 according to the signal level of the input signal detected by the signal detector 600. That is, the controller 500 selects one of the plurality of analog-digital converters according to the signal level of the input signal detected by the signal detector 600 and converts the signal output to the main path into a digital signal.

Here, when the signal level of the input signal sensed by the signal detector 600 is greater than the first threshold value, the controller 500 attenuates the first analog-digital converter 300 for attenuating and converting the signal level of the input signal. Optionally, an input signal may be transmitted along the first analog-digital conversion path. On the other hand, when the signal level of the input signal sensed by the signal detector 600 is less than the second threshold value, the controller 500 amplifies and converts the second analog-digital converter 400 for amplifying and converting the signal level of the input signal. Optionally, the input signal may be transmitted along a second analog-digital conversion path.

Here, the first threshold value may be smaller than the second threshold value, the signal level range of the input signal for passing through the first analog-digital converter 300 and the input for passing through the second analog-digital converter 400. By designing some overlap in the signal level range of the signal, signal loss does not occur. As such, when the signal level range of the input signal for passing through the first analog-digital converter 300 and the signal level range of the input signal for passing through the second analog-digital converter 400 overlap each other, the signal is included in the overlapping region. The input signal having the signal level may be set to be transmitted via the first analog to digital converter 300 or the second analog to digital converter 400.

In addition, the controller 500 may extract desired information (Data) from the digital signal converted by the first analog-digital converter 300 or the second analog-digital converter 400. That is, the control unit 500 is connected to the rear end of each of the first analog-digital converter 300 and the second analog-to-digital converter 400 to receive a digital signal converted from an input signal including an analog signal, Data can be extracted.

Hereinafter, the operation of the signal processing apparatus according to the embodiment of the present invention will be described in detail.

FIG. 5 is a diagram illustrating the first analog-digital converter 300 connected to the signal branch unit 100 on the main path M. FIG. 6 is a view illustrating the signal branch unit 100 on the main path M. Referring to FIG. 2 is a diagram illustrating how the second analog-to-digital converter 400 is connected.

Referring to FIG. 5, when a strong electric field signal having a signal level equal to or greater than a first threshold is input as an input signal, the input signal is different from the main path M and the main path M by the signal branch 100. Output to the auxiliary path (S), respectively.

Here, since the signal level of the input signal is greater than the first threshold value, the controller 500 connects the main switch 200 to the first analog-digital converter 300. In addition, the controller 500 connects the first switch 320 to the first analog-to-digital converter 340 through the first filter 330. In this way, the control unit 500 controls the main switch 200 and the first switch 320, the input signal output to the main path (M) is attenuated the signal level is converted into a digital signal.

In addition, the controller 500 connects the first switch 320 to the first analog-to-digital converter 340 through the first filter 330 and simultaneously connects the second switch 420 to the second termination circuit 450. Can connect As such, by connecting the second switch 420 included in the second analog-to-digital converter 400 to the second termination circuit 450, the strong field signal transmitted along the first analog-digital conversion path is converted into the second analog-digital conversion. It may be prevented from leaking into the path and flowing into the second analog-to-digital converter 440.

The first analog-to-digital converter 340 converts a signal input through the first filter 330 into a digital signal. In this case, although the signal level is reduced through the attenuator 310, the input signal may still have a value outside the dynamic range of the first analog to digital converter 340. That is, the signal level of the input signal may have a value greater than the highest signal level belonging to the dynamic range of the first analog to digital converter 340 even through the attenuator 310. In this case, the first analog-to-digital converter 340 may transmit the first overflow bit OVF1 indicating whether the first analog-digital converter 340 is saturated to the controller 500. That is, when a signal having a value greater than the highest signal level is input to the first analog-to-digital converter 340, the first overflow bit OVF1 transmitted to the controller 500 is activated. In this case, the controller 500 The attenuation amount of the attenuator 310 is increased to attenuate the signal level of the input signal to a greater width. As such, by determining whether the first analog-to-digital converter 340 is saturated using the first overflow bit OVF1, it is not necessary to continuously measure the signal level of the input signal on the transmission path, thereby minimizing the signal processing time. You can do it.

Referring to FIG. 6, when a weak field signal having a signal level equal to or less than a second threshold is input as an input signal, the input signal is input by the signal branch unit 100 to the main path M and the main path ( Are output to the auxiliary path S different from M).

Here, since the signal level of the input signal is smaller than the second threshold value, the controller 500 connects the main switch 200 to the second analog-digital converter 400. In addition, the controller 500 connects the second switch 420 to the second analog-to-digital converter 440 through the second filter 430. As such, the controller 500 controls the main switch 200 and the second switch 420 so that the input signal output through the main path M is amplified and converted into a digital signal.

In addition, the controller 500 connects the second switch 420 to the second analog-to-digital converter 440 through the second filter 430 and simultaneously connects the first switch 320 to the first termination circuit 350. Can connect As such, by connecting the first switch 320 included in the first analog-digital converter 300 to the first termination circuit 350, the weak field signal transmitted along the second analog-digital conversion path is amplified and the first analog. Leakage in the digital conversion path may be prevented from flowing into the first analog to digital converter 340.

Meanwhile, the second analog to digital converter 440 converts a signal input through the second filter 430 into a digital signal. At this time, the input signal is amplified signal level through the amplifier 410, but the signal level may still have a value outside the dynamic range of the second analog-to-digital converter 440. That is, the signal level of the input signal may have a value smaller than the lowest signal level belonging to the dynamic range of the second analog to digital converter 440 even through the amplifier 410. In this case, the second analog to digital converter 440 may transmit the second overflow bit OVF2 indicating whether the second analog to digital converter 440 is saturated to the controller 500. That is, when a signal having a value smaller than the lowest signal level is input to the second analog-to-digital converter 440, the second overflow bit OVF2 transmitted to the controller 500 is activated. In this case, the controller 500 Increasing the amount of amplification of the amplifier 410 increases the signal level of the input signal to a greater width. In this way, it is not necessary to continuously measure the signal level of the input signal on the transmission path by determining whether the second analog-to-digital converter 440 is saturated using the second overflow bit OVF2, thereby minimizing the signal processing time. You can do it.

Hereinafter, a signal processing method according to an embodiment of the present invention will be described. In this regard, a description overlapping with the above description with respect to the signal processing apparatus according to an embodiment of the present invention will be omitted.

7 is a diagram illustrating a signal processing method according to an exemplary embodiment of the present invention.

Referring to FIG. 7, a signal processing method according to an exemplary embodiment of the present disclosure may include outputting an input signal including an analog signal to a main path M and an auxiliary path S different from the main path M, respectively. (S100); Detecting a signal level of an input signal output from the auxiliary path (S200) (S200); Selecting one of a plurality of analog-to-digital conversion paths arranged in parallel on the main path M according to the detected signal level of the input signal (S300); And converting an input signal into a digital signal through the selected analog to digital conversion path (S400).

In the process of outputting an input signal to the main path M and the auxiliary path S different from the main path M, in step S100, an input signal including an analog signal is output by the signal branch unit 100 to the main path M. FIG. ) And the auxiliary path S which is different from the main path M, respectively. Here, the signal branch unit 100 may use a divider for directly dividing and dividing the input signal, but may include a directional coupler to block the signal output to the main path (M) from flowing into the auxiliary path (S). May be as described above.

In the process of detecting a signal level of the input signal (S200), the signal level of the input signal output to the auxiliary path S by the signal branch unit 100 is detected through the signal detector 600. In the detecting of the signal level of the input signal (S200), the signal level of the input signal may be converted into a voltage value and output as a received signal strength index (RSSI).

Selecting one of the plurality of analog-to-digital conversion paths (S300) includes one of a plurality of analog-to-digital conversion paths arranged in parallel on the main path M according to the signal level of the input signal detected by the signal detection unit 600. Select.

Here, the plurality of analog digital conversion paths are paths arranged in parallel on the main path M to convert an input signal including an analog signal into a digital signal, and each of the plurality of analog digital conversion paths includes a plurality of analog digital signals. A converter is arranged to convert the input signal into a digital signal.

Here, the plurality of analog-to-digital conversion paths include attenuators 310 for attenuating signal levels of an input signal and first analog-digital converters 340 for converting signals output from the attenuator 310 into digital signals. An amplifier 410 for amplifying a signal level of an input signal and a first analog-to-digital conversion path disposed therein, and a second analog-to-digital converter 440 for converting a signal output from the amplifier 410 into a digital signal. It may include a second analog to digital conversion path disposed sequentially.

In addition, a first filter 330 may be disposed between the attenuator 310 and the first analog to digital converter 340, and a second filter 430 between the amplifier 410 and the second analog to digital converter 440. May be disposed, and with respect to each component disposed in the first analog-digital conversion path and the second analog-digital conversion path, the same descriptions as described above with respect to the signal processing apparatus according to the embodiment of the present invention will be described. Will be omitted.

Here, in the step S300 of selecting one of the plurality of analog digital conversion paths, when the signal level of the input signal is greater than the first threshold value, the first analog digital conversion path is selected, and the signal level of the input signal is the second. If less than a threshold value, the second analog-to-digital conversion path may be selected.

That is, the control unit 500 attenuates the first analog-digital converter 300 for attenuating and converting the signal level of the input signal when the signal level of the input signal detected by the signal detector 600 is greater than the first threshold value. Optionally, an input signal may be transmitted along the first analog-digital conversion path. On the other hand, when the signal level of the input signal sensed by the signal detector 600 is greater than the second threshold value, the controller 500 a second analog-digital converter 400 for amplifying and converting the signal level of the input signal. Optionally, the input signal may be transmitted along a second analog-digital conversion path.

Here, the first threshold value may be smaller than the second threshold value, the signal level range of the input signal for passing through the first analog-digital converter 300 and the input for passing through the second analog-digital converter 400. As described above, it is possible to prevent signal loss from occurring by designing the signal level ranges of the signals to partially overlap.

In the process of converting the input signal into the digital signal (S400), the input signal is converted into the digital signal via the analog-to-digital conversion path selected in the process of selecting one of the plurality of analog digital conversion paths (S300). That is, in the process of converting the input signal into a digital signal (S400), the input signal is attenuated or amplified through the first analog digital conversion path or the second analog digital conversion path to be converted into a digital signal.

Here, in the step (S400) of converting an input signal into a digital signal, when the first analog-to-digital conversion path is selected in the step (S300) of selecting the analog-to-digital conversion path, the amplifier 410 is connected to ground, When the second analog digital conversion path is selected in step S300 of selecting an analog digital conversion path, the attenuator 310 may be connected to ground.

As a result, the strong field signal transmitted along the first analog digital conversion path leaks to the second analog digital conversion path, or the weak field signal transmitted along the second analog digital conversion path is amplified to the second analog digital conversion path. The leakage can be prevented as described above.

In addition, the process of converting an input signal into a digital signal (S400) is performed when the signal input to the first analog to digital converter 340 is out of the dynamic range of the first analog to digital converter 340 of the attenuator 310 When the signal input to the second analog-to-digital converter 440 is out of the dynamic range of the second analog-to-digital converter 440, the amplification amount of the amplifier 410 may be increased.

That is, the input signal has a first analog-to-digital converter 340 whose signal level is reduced or increased through the attenuator 310 or the amplifier 410 but is still connected to the attenuator 310 and the amplifier 410, respectively. It may have a value out of the dynamic range of the second analog to digital converter 440. Accordingly, the first analog-to-digital converter 340 and the second analog-to-digital converter 440 may include the first overflow bit OVF1 provided to the controller 500 when a signal having a signal level out of the dynamic range is input. The second overflow bit OVF2 may be activated. Therefore, by determining whether the first analog-to-digital converter 340 and the second analog-to-digital converter 440 are saturated by using the first overflow bit OVF1 and the second overflow bit OVF2, the signal level of the input signal. Does not need to be measured continuously on the transmission path and signal processing time can be minimized.

As described above, according to the signal processing apparatus and the signal processing method using the same according to an embodiment of the present invention, by selecting the path through which the input signal including the analog signal is transmitted by the main switch 200 to convert the channel to a digital signal It is possible to prevent performance degradation and path selection error caused by inter-interference.

In addition, by selecting a path for converting the input signal according to the signal level of the input signal, not only can the additional signal processing time be shortened, but also the signal according to the signal constraint by determining whether the digital converter is saturated using the overflow bit. Distortion can be minimized.

In addition, according to the signal processing apparatus and the signal processing method using the same according to an embodiment of the present invention, the attenuator 310 for attenuating the signal level of the input signal and the amplifier 410 for amplifying the signal level of the input signal Gain can be controlled in real time to prevent performance degradation due to saturation of components.

In the above, while the preferred embodiment of the present invention has been described and illustrated using specific terms, such terms are only for clearly describing the present invention, and the embodiments of the present invention and the described terms are used in the technical spirit of the following claims. It is obvious that various changes and modifications can be made without departing from the scope of the present invention. Such modified embodiments should not be understood individually from the spirit and scope of the present invention, but should fall within the claims of the present invention.

100: signal branch 200: main switch
300: first analog to digital converter 310: attenuator
320: first switch 330: first filter
340: first analog-to-digital converter 350: first termination circuit
400: second analog-to-digital converter 410: amplifier
420: second switch 430: second filter
440: second analog-to-digital converter 450: second termination circuit
500: control unit 600: signal detection unit

Claims (7)

Outputting an input signal including an analog signal to a primary path and an auxiliary path different from the primary path, respectively;
Detecting a signal level of an input signal output from the auxiliary path;
Selecting one of a plurality of analog-digital conversion paths arranged in parallel on the main path according to the sensed signal level of the input signal; And
Converting an input signal into a digital signal via the selected analog to digital conversion path;
The plurality of analog digital paths,
A first analog-digital conversion path in which attenuators for attenuating signal levels of the input signal and first analog-to-digital converters for converting signals output from the attenuators into digital signals are sequentially arranged; And
And a second analog digital conversion path in which an amplifier for amplifying a signal level of the input signal and a second analog to digital converter for converting a signal output from the amplifier into a digital signal are sequentially arranged.
Converting the input signal into a digital signal,
If the signal input to the first analog to digital converter has a value greater than the highest signal level in the dynamic range of the first analog to digital converter, activate the first overflow bit,
If the signal input to the second analog to digital converter has a value less than the lowest signal level in the dynamic range of the second analog to digital converter, activate the second overflow bit,
And increasing the attenuation amount of the attenuator when the first overflow bit is activated and increasing the amplification amount of the amplifier when the second overflow bit is activated.
The method according to claim 1,
The process of detecting the signal level of the input signal,
And converting the signal level of the input signal into a voltage value and outputting the received signal strength as a received signal strength index (RSSI).
delete The method according to claim 1,
The process of selecting one of the plurality of analog to digital conversion paths,
Select the first analog-to-digital conversion path when the signal level of the input signal is greater than a first threshold value;
Select the second analog-to-digital conversion path when the signal level of the input signal is smaller than a second threshold value greater than the first threshold value,
And selecting one of the first analog digital conversion path and the second analog digital conversion path when the signal level of the input signal is within the range of the first threshold value and the second threshold value.
delete The method according to claim 1,
Converting the input signal into a digital signal,
If the first analog-to-digital conversion path is selected in the process of selecting the analog-to-digital conversion path, connect the amplifier to ground,
And if the second analog-digital conversion path is selected in the process of selecting the analog-digital conversion path, connecting the attenuator to ground.
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