TWI805939B - Tuner device and signal-to-noise ratio measurement method thereof - Google Patents
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本發明是有關於一種信號處理裝置,且特別是有關於一種調諧器裝置及其訊雜比量測方法。The present invention relates to a signal processing device, and in particular to a tuner device and its signal-to-noise ratio measurement method.
在習知技術中,在對量產的調諧器積體電路良率檢測時,通常會利用外部測試儀器來進行訊雜比量測。此方式雖可有效地檢測出調諧器積體電路的訊雜比,然由有檢測效率不佳的問題,因此如何在不降低良率檢測準確度的前提下有效提高檢測效率,進而降低測試成本為一亟待解決的問題。In the prior art, when testing the yield rate of mass-produced tuner integrated circuits, an external test instrument is usually used to measure the signal-to-noise ratio. Although this method can effectively detect the signal-to-noise ratio of the tuner integrated circuit, it has the problem of poor detection efficiency. Therefore, how to effectively improve the detection efficiency without reducing the accuracy of yield detection, thereby reducing the test cost is an urgent problem to be solved.
本發明提供一種調諧器裝置及其訊雜比量測方法,可精確且快速地檢測調諧器裝置的訊雜比,而可有效降低調諧器裝置的測試成本。The invention provides a tuner device and its signal-to-noise ratio measurement method, which can accurately and quickly detect the signal-to-noise ratio of the tuner device, and can effectively reduce the test cost of the tuner device.
本發明的調諧器裝置包括調諧器電路、解調器電路以及訊雜比計算電路。調諧器電路調諧射頻信號而產生調諧信號。解調器電路耦接調諧器電路,解調調諧信號而產生解調信號。訊雜比計算電路耦接調諧器電路,依據解調信號與調諧器裝置接收的射頻信號的接收訊號強度指示值產生訊雜比信號。The tuner device of the present invention includes a tuner circuit, a demodulator circuit and a signal-to-noise ratio calculation circuit. The tuner circuit tunes the radio frequency signal to generate a tuned signal. The demodulator circuit is coupled to the tuner circuit and demodulates the tuned signal to generate a demodulated signal. The signal-to-noise ratio calculation circuit is coupled to the tuner circuit, and generates a signal-to-noise ratio signal according to the demodulated signal and the received signal strength indicator value of the radio frequency signal received by the tuner device.
本發明還提供一種調諧器裝置的訊雜比量測方法,調諧器裝置包括訊雜比計算電路。調諧器裝置的訊雜比量測方法包括下列步驟。調諧射頻信號而產生調諧信號。解調調諧信號而產生解調信號。利用調諧器裝置中的訊雜比計算電路依據解調信號與調諧器裝置接收的射頻信號的接收訊號強度指示值產生訊雜比信號。The invention also provides a signal-to-noise ratio measurement method of the tuner device, and the tuner device includes a signal-to-noise ratio calculation circuit. The method for measuring the signal-to-noise ratio of the tuner device includes the following steps. The radio frequency signal is tuned to generate a tuning signal. The tuning signal is demodulated to generate a demodulated signal. The signal-to-noise ratio calculation circuit in the tuner device is used to generate the signal-to-noise ratio signal according to the demodulated signal and the received signal strength indicator value of the radio frequency signal received by the tuner device.
基于上述,本發明實施例藉由在調諧器裝置內部設置訊雜比計算電路,來依據解調信號與調諧器裝置的接收訊號強度指示值產生訊雜比信號,如此可大幅減少外部測試儀器的使用,而直接由調諧器裝置內部設置的訊雜比計算電路來產生訊雜比信號,因此可有效解決外部測試儀器檢測訊雜比效率過低的問題,進而降低調諧器裝置的測試成本。Based on the above, the embodiment of the present invention generates the signal-to-noise ratio signal according to the demodulated signal and the received signal strength indicator value of the tuner device by setting the SNR calculation circuit inside the tuner device, which can greatly reduce the need for external test equipment. The signal-to-noise ratio signal is directly generated by the signal-to-noise ratio calculation circuit provided inside the tuner device, so it can effectively solve the problem of low signal-to-noise ratio detection efficiency of external test instruments, thereby reducing the test cost of the tuner device.
圖1是依照本發明的實施例的一種調諧器裝置的示意圖,請參照圖1。調諧器裝置100可包括調諧器電路102、解調器電路104以及訊雜比計算電路106,其中解調器電路104耦接調諧器電路102與訊雜比計算電路106。調諧器電路102可接收來自訊號源(未繪示)的射頻信號RF1,以調諧射頻信號RF1而產生調諧信號FM1。解調器電路104可解調調諧信號FM1而產生解調信號DM1。訊雜比計算電路106則可依據解調信號DM1與調諧器裝置100接收的射頻信號RF1的接收訊號強度指示(Received Signal-Strength Indicator, RSSI)值R1產生訊雜比信號SNR1,其中接收訊號強度指示值R1代表調諧器裝置由天線端所接收的射頻信號RF1的信號強度。FIG. 1 is a schematic diagram of a tuner device according to an embodiment of the present invention, please refer to FIG. 1 . The
訊雜比計算電路106可透過內部整合電路匯流排(Inter Integrated Circuit bus,I2C bus)輸出訊雜比信號SNR1至調諧器裝置100的外部,例如可輸出至電腦主機,以使電腦主機依據訊雜比信號SNR1判斷調諧器裝置100的良率或靈敏度。如此藉由直接在調諧器裝置100內設置訊雜比計算電路106來計算訊雜比信號SNR1,可大幅減少外部測試儀器的使用,而可有效地提高檢測效率,降低作為調諧器裝置的量產的積體電路的測試成本。The signal-to-noise
圖2是依照本發明的實施例的一種訊雜比計算電路的示意圖,請參照圖2。進一步來說,訊雜比計算電路106可如圖2所示,包括雜訊提取電路202、取樣平均電路204、突波抑制電路206以及縮放處理電路208,其中取樣平均電路204耦接雜訊提取電路202與突波抑制電路206,縮放處理電路208耦接突波抑制電路206。雜訊提取電路202可提取解調信號DM1的高頻雜訊信號N1,在部份實施例中,雜訊提取電路202可例如以高通濾波器來實施。取樣平均電路204可對高頻雜訊信號N1進行取樣,而產生雜訊平均信號AN1。在部份實施例中,雜訊平均信號AN1可包括在預設取樣期間內高頻雜訊信號N1的取樣信號的平均值。舉例來說,取樣平均電路204可以預設取樣期間為單位對週期性地對高頻雜訊信號N1進行取樣以產生雜訊平均信號AN1,例如取樣平均電路204可在各個預設取樣期間內對高頻雜訊信號N1進行多次取樣,並計算各個預設取樣期間內的多個取樣信號的平均值,雜訊平均信號AN1可包括多個預設取樣期間所對應的多個取樣信號平均值。FIG. 2 is a schematic diagram of a signal-to-noise ratio calculation circuit according to an embodiment of the present invention, please refer to FIG. 2 . Further, the signal-to-noise
突波抑制電路206可偵測雜訊平均信號AN1是否包括突波,並抑制包括突波的雜訊平均信號AN1,而輸出突波被抑制後的雜訊平均信號AN2。舉例來說,突波抑制電路206可判斷雜訊平均信號AN1所包括的多個取樣信號平均值是否大於預設值,並將大於預設值的取樣信號平均值剔除(亦即此取樣信號平均值包括突波成分而需被剔除),而僅將未大於預設值的取樣信號平均值做為雜訊平均信號AN2輸出,以使雜訊平均信號AN2不包括突波。The
縮放處理電路208可接收突波被抑制後的雜訊平均信號AN2,並依據縮放因子縮放突波抑制電路206輸出的雜訊平均信號AN2,以產生縮放雜訊信號,並依據接收訊號強度指示值R1與縮放雜訊信號產生訊雜比信號SNR1。其中縮放因子的大小可例如對應訊號強度指示值R1調整,亦即對應不同訊號強度指示值R1的範圍,縮放因子可被設計為不同值,以使訊雜比計算電路106可提供更精確的訊雜比信號SNR1。例如當接收訊號強度指示值R1大於門檻值時,縮放因子可設計為第一縮放因子,而當接收訊號強度指示值R1不大於門檻值時,縮放因子可設計為第二縮放因子。在一實施例中,縮放因子與縮放雜訊信號成正相關,第二縮放因子可設計為不同於第一縮放因子,以使當接收訊號強度較低時,仍能產生較精確的訊雜比信號SNR1。The
在部份實施例中,可依據外部測試儀器對調諧器裝置100進行訊雜比量測所得到的訊雜比信號來調整縮放因子,亦即將外部測試儀器對調諧器裝置100進行訊雜比量測所得到的訊雜比信號做為標準值來調整縮放因子,以使訊雜比計算電路106所提供的訊雜比信號SNR1可與外部測試儀器所提供的訊雜比信號具有較接近的值。如此可確保調諧器裝置100的良率檢測準確度接近或不低於使用外部測試儀器進行良率檢測的準確度,且仍能大幅提高檢測效率。In some embodiments, the scaling factor can be adjusted according to the signal-to-noise ratio signal obtained by measuring the signal-to-noise ratio of the
圖3是依照本發明的實施例的一種調諧器裝置的訊雜比量測方法的流程圖,請參照圖3。由上述實施例可知,調諧器裝置的訊雜比量測方法可至少包括下列步驟。首先,調諧射頻信號而產生調諧信號(步驟S302)。接著,解調調諧信號而產生解調信號(步驟S304)。然後,利用調諧器裝置中的訊雜比計算電路依據解調信號與調諧器裝置接收的射頻信號的接收訊號強度指示值產生訊雜比信號(步驟S306),其中訊雜比計算電路可透過內部整合電路匯流排輸出訊雜比信號至電腦主機,以使電腦主機依據訊雜比信號判斷調諧器裝置的良率或靈敏度。如此藉由利用在調諧器裝置內設置的訊雜比計算電路來計算訊雜比信號,大幅減少外部測試儀器的使用,而可有效地提高檢測效率,降低作為調諧器裝置的量產的積體電路的測試成本。FIG. 3 is a flow chart of a method for measuring the signal-to-noise ratio of a tuner device according to an embodiment of the present invention. Please refer to FIG. 3 . It can be seen from the above embodiments that the method for measuring the signal-to-noise ratio of the tuner device may at least include the following steps. Firstly, a radio frequency signal is tuned to generate a tuning signal (step S302). Next, demodulate the tuning signal to generate a demodulated signal (step S304). Then, use the signal-to-noise ratio calculation circuit in the tuner device to generate the signal-to-noise ratio signal (step S306) according to the received signal strength indication value of the demodulated signal and the radio frequency signal received by the tuner device (step S306), wherein the signal-to-noise ratio calculation circuit can pass through the internal The integrated circuit bus outputs the signal-to-noise ratio signal to the computer host, so that the computer host judges the yield or sensitivity of the tuner device according to the signal-to-noise ratio signal. In this way, by using the signal-to-noise ratio calculation circuit installed in the tuner device to calculate the signal-to-noise ratio signal, the use of external test equipment can be greatly reduced, and the detection efficiency can be effectively improved, and the mass-produced integrated body of the tuner device can be reduced. Circuit testing costs.
進一步來說,利用訊雜比計算電路計算訊雜比信號的步驟S306可如圖4所示包括步驟S402~S410。首先,在步驟S402中,提取解調信號的高頻雜訊信號,例如可對解調信號進行高通濾波處理,以提取解調信號的高頻雜訊信號。接著,在步驟S404中,取樣高頻雜訊信號而產生雜訊平均信號,雜訊平均信號指示預設取樣期間內高頻雜訊信號的取樣信號的平均值。舉例來說,可以預設取樣期間為單位對週期性地對高頻雜訊信號進行取樣以產生雜訊平均信號,例如可在各個預設取樣期間內對高頻雜訊信號進行多次取樣,並計算各個預設取樣期間內的多個取樣信號的平均值,雜訊平均信號可包括多個預設取樣期間所對應的多個取樣信號平均值。Further, the step S306 of calculating the signal-to-noise ratio signal by using the signal-to-noise ratio calculation circuit may include steps S402˜S410 as shown in FIG. 4 . First, in step S402, the high-frequency noise signal of the demodulated signal is extracted. For example, high-pass filtering may be performed on the demodulated signal to extract the high-frequency noise signal of the demodulated signal. Next, in step S404, the high-frequency noise signal is sampled to generate a noise average signal, and the noise average signal indicates the average value of the sampled signals of the high-frequency noise signal within a preset sampling period. For example, the high-frequency noise signal may be periodically sampled in units of a preset sampling period to generate a noise average signal, for example, the high-frequency noise signal may be sampled multiple times within each preset sampling period, And calculating the average value of multiple sampling signals in each preset sampling period, the noise average signal may include the multiple sampling signal average values corresponding to multiple preset sampling periods.
在步驟S406中,可判斷雜訊平均信號是否包括突波。例如可判斷雜訊平均信號所包括的多個取樣信號平均值是否大於預設值,而將取樣信號平均值是否大於預設值的雜訊平均信號判斷為包括突波。在步驟S408中,可依據縮放因子縮放突波被抑制後的雜訊平均信號,以產生縮放雜訊信號。其中縮放因子的大小可例如依據訊號強度指示值設計,亦即對應不同訊號強度指示值,縮放因子可被設計為不同值,以使訊雜比計算電路可提供更精確的訊雜比信號。例如當接收訊號強度指示值大於門檻值時,縮放因子可設計為第一縮放因子,而當接收訊號強度指示值不大於門檻值時,縮放因子可設計為第二縮放因子。最後,在步驟S410中,可依據接收訊號強度指示值與縮放雜訊信號產生訊雜比信號。在部份實施例中,可依據外部測試儀器對調諧器裝置進行訊雜比量測所得到的訊雜比信號來設計縮放因子,以使訊雜比計算電路所提供的訊雜比信號可與外部測試儀器所提供的訊雜比信號具有較接近的值。進而確保調諧器裝置的良率檢測準確度接近或不低於使用外部測試儀器進行良率檢測的準確度,且仍能大幅提高檢測效率。In step S406, it may be determined whether the noise average signal includes a surge. For example, it can be determined whether the average value of a plurality of sampled signals included in the noise average signal is greater than a preset value, and the noise average signal whether the average value of the sampled signals is greater than a preset value is determined to include a spike. In step S408 , the average noise signal after the spur is suppressed may be scaled according to a scaling factor to generate a scaled noise signal. The size of the scaling factor can be designed according to the signal strength indication value, that is, corresponding to different signal strength indication values, the scaling factor can be designed as different values, so that the signal-to-noise ratio calculation circuit can provide a more accurate signal-to-noise ratio signal. For example, when the RSSI value is greater than the threshold value, the scaling factor can be designed as the first scaling factor, and when the RSSI value is not greater than the threshold value, the scaling factor can be designed as the second scaling factor. Finally, in step S410, a signal-to-noise ratio signal can be generated according to the received signal strength indicator value and the scaled noise signal. In some embodiments, the scaling factor can be designed according to the signal-to-noise ratio signal obtained by measuring the signal-to-noise ratio of the tuner device by an external test instrument, so that the signal-to-noise ratio signal provided by the signal-to-noise ratio calculation circuit can be compared with The signal-to-noise ratio signal provided by the external test instrument has a closer value. Thus, it can be ensured that the accuracy of the yield detection of the tuner device is close to or not lower than the accuracy of the yield detection using an external test instrument, and the detection efficiency can still be greatly improved.
綜上所述,本發明實施例藉由在調諧器裝置內部設置訊雜比計算電路,來依據解調信號與調諧器裝置的接收訊號強度指示值產生訊雜比信號,如此可大幅減少外部測試儀器的使用,而直接由調諧器裝置內部設置的訊雜比計算電路來產生訊雜比信號,因此可有效解決外部測試儀器檢測效率過低的問題,進而降低調諧器裝置的測試成本。To sum up, the embodiment of the present invention generates an SNR signal based on the demodulated signal and the received signal strength indication value of the tuner device by setting the SNR calculation circuit inside the tuner device, which can greatly reduce external testing The signal-to-noise ratio signal is directly generated by the signal-to-noise ratio calculation circuit inside the tuner device, so it can effectively solve the problem of low detection efficiency of the external test instrument, thereby reducing the test cost of the tuner device.
100:調諧器裝置 102:調諧器電路 104:解調器電路 106:訊雜比計算電路 202:雜訊提取電路 204:取樣平均電路 206:突波抑制電路 208:縮放處理電路 RF1:射頻信號 FM1:調諧信號 DM1:解調信號 R1:接收訊號強度指示值 SNR1:訊雜比信號 N1:高頻雜訊信號 AN1、AN2:雜訊平均信號 S302~S306:調諧器裝置的訊雜比量測方法的步驟 S402~S410:利用訊雜比計算電路計算訊雜比信號的步驟100: Tuner device 102: Tuner circuit 104: Demodulator circuit 106: Signal-to-noise ratio calculation circuit 202: noise extraction circuit 204: Sampling average circuit 206: Surge suppression circuit 208: scaling processing circuit RF1: radio frequency signal FM1: tuning signal DM1: demodulation signal R1: Received signal strength indicator value SNR1: signal-to-noise ratio signal N1: High frequency noise signal AN1, AN2: noise average signal S302~S306: Steps of the method for measuring the signal-to-noise ratio of the tuner device S402~S410: Steps of calculating the signal-to-noise ratio signal by using the signal-to-noise ratio calculation circuit
圖1是依照本發明的實施例的調諧器裝置的示意圖。 圖2是依照本發明的實施例的一種訊雜比計算電路的示意圖。 圖3是依照本發明的實施例的一種調諧器裝置的訊雜比量測方法的流程圖。 圖4是依照本發明的實施例的一種,利用訊雜比計算電路計算訊雜比信號的流程圖。FIG. 1 is a schematic diagram of a tuner device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a signal-to-noise ratio calculation circuit according to an embodiment of the present invention. FIG. 3 is a flow chart of a method for measuring the signal-to-noise ratio of a tuner device according to an embodiment of the present invention. FIG. 4 is a flow chart of calculating the signal-to-noise ratio signal by using the signal-to-noise ratio calculation circuit according to an embodiment of the present invention.
100:調諧器裝置100: Tuner device
102:調諧器電路102: Tuner circuit
104:解調器電路104: Demodulator circuit
106:訊雜比計算電路106: Signal-to-noise ratio calculation circuit
RF1:射頻信號RF1: radio frequency signal
FM1:調諧信號FM1: tuning signal
DM1:解調信號DM1: demodulation signal
R1:接收訊號強度指示值R1: Received signal strength indicator value
SNR1:訊雜比信號SNR1: signal-to-noise ratio signal
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20020036713A1 (en) * | 1998-02-10 | 2002-03-28 | Wavetek Coporation | Noise measurement system |
TW200620875A (en) * | 2004-12-15 | 2006-06-16 | Mediatek Inc | Impluse supression apparatus of OFDM system and impluse supression method thereof |
WO2009075780A1 (en) * | 2007-12-07 | 2009-06-18 | Thomson Licensing | Satellite receiver software algorithm for setting an input attenuator |
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Publication number | Priority date | Publication date | Assignee | Title |
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US20020036713A1 (en) * | 1998-02-10 | 2002-03-28 | Wavetek Coporation | Noise measurement system |
TW200620875A (en) * | 2004-12-15 | 2006-06-16 | Mediatek Inc | Impluse supression apparatus of OFDM system and impluse supression method thereof |
WO2009075780A1 (en) * | 2007-12-07 | 2009-06-18 | Thomson Licensing | Satellite receiver software algorithm for setting an input attenuator |
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