TWI583206B - Apparatus and method of stereo signals driving - Google Patents
Apparatus and method of stereo signals driving Download PDFInfo
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本揭露係關於一種立體聲訊號驅動的裝置和方法。 The present disclosure relates to a stereo signal driven device and method.
以往，類比音頻播放常應用在收音機、類比電視等，以類比訊號直接驅動喇叭。隨著科技的進步，個人電腦和網路的演進及數位音頻訊號處理的發展，數位音頻播放已經應用於各種電子系統如電影院、家用、汽車等音響，以及數位電視、各種型式電腦、隨身聽、手機等。其中音頻訊號驅動的功能必須具備低雜音、高品質的特性，使得音響效果更為完善。 In the past, analog audio playback was often applied to radios, analog TVs, etc., and the speakers were directly driven by analog signals. With the advancement of technology, the evolution of personal computers and networks, and the development of digital audio signal processing, digital audio playback has been applied to various electronic systems such as cinemas, homes, automobiles and other audio, as well as digital televisions, various types of computers, walkmans, Mobile phones, etc. Among them, the function of audio signal driving must have low noise and high quality, which makes the sound effect more perfect.
現有的一些音頻訊號驅動技術已使用數位訊號處理來改善前端輸入音頻訊號的失真和雜訊干擾。一種技術如圖1所示，將立體聲的雙聲道的脈衝編碼調變(Pulse Code Modulation,PCM)訊號經過三角積分調變器(Sigma-Delta Modulator,SDM)來產生脈衝密度調變(Pulse Density Modulation,PDM)訊號，再經由轉換器輸出脈衝寬度調變(Pulse Width Modulation,PWM)訊號來驅動外部負載，例如雙聲道耳機。參考圖1，其中需要一個隔離電容將每一單聲道的PWM訊號中的直流成分運用高通濾波器去除，然後才能驅動耳機。若不將直流成分移除，會有大直流電流流過耳機單體。 Some existing audio signal driving technologies have used digital signal processing to improve the distortion and noise interference of the front input audio signal. One technique is shown in Figure 1. A stereo two-channel Pulse Code Modulation (PCM) signal is generated by a Sigma-Delta Modulator (SDM) to generate pulse density modulation (Pulse Density). Modulation, PDM) signal, then output pulse width modulation via the converter (Pulse Width) Modulation, PWM) signals to drive external loads, such as two-channel headphones. Referring to Figure 1, an isolation capacitor is required to remove the DC component of each mono PWM signal using a high-pass filter before driving the headphones. If the DC component is not removed, a large DC current will flow through the headphone unit.
本揭露提出一種立體聲訊號驅動的技術，經由接收立體聲訊號的處理，將耳機的中性線也使用PWM訊號驅動以取代原有的接地，以達到無須高通濾波器也能達到無直流漏電的要求。 The present disclosure proposes a stereo signal driving technology. By receiving a stereo signal, the neutral line of the earphone is also driven by a PWM signal to replace the original ground, so that the requirement of no DC leakage can be achieved without a high-pass filter.
本揭露實施例可提供關於一種立體聲訊號驅動的裝置和方法。 Embodiments of the present disclosure can provide an apparatus and method for driving a stereo signal.
所揭露的一實施例是關於一種立體聲訊號驅動的裝置，應用於驅動一第一外部負載和一第二外部負載，此裝置包含：一三角積分調變器(SDM)，將輸入的一第一脈衝編碼調變(PCM)訊號和一第二脈衝編碼調變訊號分別轉換成一第一脈衝密度調變(PDM)訊號和一第二脈衝密度調變訊號；一編碼轉換器，將第一脈衝密度調變訊號和第二脈衝密度調變訊號分別轉換成一第一輸出脈衝密度調變(PDM)訊號、一第二輸出脈衝密度調變訊號和一第三輸出脈衝密度調變訊號；一脈衝寬度調變器，將第一輸出脈衝密度調變訊號、第二輸出脈衝密度 調變訊號和第三輸出脈衝密度調變訊號分別轉換成第一脈衝寬度調變(PWM)訊號、一第二脈衝寬度調變訊號和一第三脈衝寬度調變訊號；一訊號轉換器，將第一脈衝寬度調變訊號、第二脈衝寬度調變訊號和第三脈衝寬度調變訊號轉換成一第一驅動訊號、一第二驅動訊號和一第三驅動訊號；一第一功率驅動器，接收第一驅動訊號和第三驅動訊號來驅動第一外部負載；以及一第二功率驅動器，接收第二驅動訊號和第三驅動訊號來驅動該第二外部負載。 An embodiment disclosed is directed to a stereo signal driven device for driving a first external load and a second external load, the device comprising: a triangular integral modulator (SDM), which inputs a first The pulse code modulation (PCM) signal and the second pulse code modulation signal are respectively converted into a first pulse density modulation (PDM) signal and a second pulse density modulation signal; a transcoder, the first pulse density The modulation signal and the second pulse density modulation signal are respectively converted into a first output pulse density modulation (PDM) signal, a second output pulse density modulation signal and a third output pulse density modulation signal; a pulse width modulation Transformer, the first output pulse density modulation signal, the second output pulse density The modulation signal and the third output pulse density modulation signal are respectively converted into a first pulse width modulation (PWM) signal, a second pulse width modulation signal and a third pulse width modulation signal; a signal converter, The first pulse width modulation signal, the second pulse width modulation signal and the third pulse width modulation signal are converted into a first driving signal, a second driving signal and a third driving signal; a first power driver receives the first a driving signal and a third driving signal to drive the first external load; and a second power driver receiving the second driving signal and the third driving signal to drive the second external load.
所揭露的另一實施例是關於一種立體聲訊號驅動的方法，應用於驅動一第一外部負載和一第二外部負載，此方法包含：使用一三角積分調變器(SDM)將輸入的一第一脈衝編碼調變訊號和一第二脈衝編碼調變訊號分別轉換成一第一脈衝密度調變訊號和一第二脈衝密度調變訊號；使用一編碼轉換器將第一脈衝密度調變訊號和第二脈衝密度調變訊號分別轉換成一第一輸出脈衝密度調變訊號、一第二輸出脈衝密度調變訊號和一第三輸出脈衝密度調變訊號；使用一脈衝寬度調變器將第一輸出脈衝密度調變訊號、第二輸出脈衝密度調變訊號和第三輸出脈衝密度調變訊號分別轉換成第一脈衝寬度調變訊號、一第二脈衝寬度調變訊號和一第三脈衝寬度調變訊號；使用一訊號轉換器將第一脈衝寬度調變訊號、第二脈衝寬度調變訊號和第三脈衝寬度調變訊號轉換成一第一驅動訊號、一第二驅動訊號和一第三驅動訊號；使用一第一功率驅動器，接收 第一驅動訊號和該第三驅動訊號來驅動第一外部負載；以及使用一第二功率驅動器，接收第二驅動訊號和第三驅動訊號來驅動第二外部負載。 Another embodiment disclosed is directed to a method of driving a stereo signal for driving a first external load and a second external load, the method comprising: using a triangular integral modulator (SDM) to input an input a pulse code modulation signal and a second pulse code modulation signal are respectively converted into a first pulse density modulation signal and a second pulse density modulation signal; the first pulse density modulation signal and the first The two pulse density modulation signals are respectively converted into a first output pulse density modulation signal, a second output pulse density modulation signal and a third output pulse density modulation signal; the first output pulse is modulated by using a pulse width modulator The density modulation signal, the second output pulse density modulation signal and the third output pulse density modulation signal are respectively converted into a first pulse width modulation signal, a second pulse width modulation signal and a third pulse width modulation signal. Converting the first pulse width modulation signal, the second pulse width modulation signal and the third pulse width modulation signal into a first one by using a signal converter Actuating signals, a second driving signal and a third driving signal; using a first power driver, receiver The first driving signal and the third driving signal drive the first external load; and the second driving driver receives the second driving signal and the third driving signal to drive the second external load.
200‧‧‧立體聲訊號驅動的裝置 200‧‧‧ Stereo signal driven device
210‧‧‧三角積分調變器 210‧‧‧Triangular integral modulator
211‧‧‧第一脈衝編碼調變訊號 211‧‧‧First pulse code modulation signal
212‧‧‧第二脈衝編碼調變訊號 212‧‧‧Second pulse code modulation signal
213‧‧‧第一脈衝密度調變訊號 213‧‧‧First pulse density modulation signal
214‧‧‧二脈衝密度調變訊號 214‧‧‧Two pulse density modulation signals
220‧‧‧編碼轉換器 220‧‧‧Code Converter
221‧‧‧第一輸出脈衝密度調變訊號 221‧‧‧First output pulse density modulation signal
222‧‧‧第二輸出脈衝密度調變訊號 222‧‧‧Second output pulse density modulation signal
223‧‧‧第三輸出脈衝密度調變訊號 223‧‧‧ Third output pulse density modulation signal
230‧‧‧脈衝寬度調變器 230‧‧‧ pulse width modulator
231‧‧‧第一脈衝寬度調變訊號 231‧‧‧First pulse width modulation signal
232‧‧‧第二脈衝寬度調變訊號 232‧‧‧Second pulse width modulation signal
240‧‧‧訊號轉換器 240‧‧‧Signal Converter
241‧‧‧第一驅動訊號 241‧‧‧First drive signal
242‧‧‧第二驅動訊號 242‧‧‧Second drive signal
243‧‧‧第三驅動訊號 243‧‧‧ Third drive signal
250‧‧‧第一功率驅動器 250‧‧‧First power driver
260‧‧‧第二功率驅動器 260‧‧‧second power driver
810‧‧‧使用一三角積分調變器將輸入的一第一脈衝編碼調變訊號和一第二脈衝編碼調變訊號分別轉換成一第一脈衝密度調變訊號和一第二脈衝密度調變訊號 810‧‧‧ Converting an input first pulse code modulation signal and a second pulse code modulation signal into a first pulse density modulation signal and a second pulse density modulation signal by using a triangular integral modulator
820‧‧‧使用一編碼轉換器將第一脈衝密度調變訊號和第二脈衝密度調變訊號分別轉換成一第一輸出脈衝密度調變訊號、一第二輸出脈衝密度調變訊號和一第三輸出脈衝密度調變訊號 820‧‧‧ Converting the first pulse density modulation signal and the second pulse density modulation signal into a first output pulse density modulation signal, a second output pulse density modulation signal, and a third, respectively, using a transcoder Output pulse density modulation signal
830‧‧‧使用一脈衝寬度調變器將第一輸出脈衝密度調變訊號、第二輸出脈衝密度調變訊號和第三輸出脈衝密度調變訊號分別轉換成第一脈衝寬度調變訊號、一第二脈衝寬度調變訊號和一第三脈衝寬度調變訊號 830‧‧‧ Using a pulse width modulator to convert the first output pulse density modulation signal, the second output pulse density modulation signal and the third output pulse density modulation signal into a first pulse width modulation signal, respectively a second pulse width modulation signal and a third pulse width modulation signal
840‧‧‧使用一訊號轉換器將第一脈衝寬度調變訊號、第二脈衝寬度調變訊號和第三脈衝寬度調變訊號轉換成一第一驅動訊號、一第二驅動訊號和一第三驅動訊號 840‧‧‧ Converting the first pulse width modulation signal, the second pulse width modulation signal and the third pulse width modulation signal into a first driving signal, a second driving signal and a third driving by using a signal converter Signal
850‧‧‧使用一第一功率驅動器，接收第一驅動訊號和該第三驅動訊號來驅動第一外部負載 850‧‧‧ using a first power driver, receiving the first driving signal and the third driving signal to drive the first external load
860‧‧‧使用一第二功率驅動器，接收第二驅動訊號和第三驅動訊號來驅動第二外部負載 860‧‧‧ Using a second power driver, receiving the second driving signal and the third driving signal to drive the second external load
圖1是一示意圖，說明傳統兩線式PWM耳機驅動技術。 Figure 1 is a schematic diagram showing a conventional two-wire PWM headphone driving technique.
圖2是與所揭露的一實施範例一致的一示意圖，說明一種立體聲訊號驅動的裝置。 2 is a schematic diagram consistent with an embodiment of the disclosure, illustrating a stereo signal driven device.
圖3是與所揭露的一實施範例一致的一示意圖，說明圖2中的脈衝編碼調變訊號。 FIG. 3 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the pulse code modulation signal of FIG.
圖4是與所揭露的一實施範例一致的一示意圖，說明圖2中轉換後的脈衝密度調變訊號。 4 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the converted pulse density modulation signal of FIG.
圖5是與所揭露的一實施範例一致的一示意圖，說明圖2中的編碼轉換器。 FIG. 5 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the transcoder of FIG.
圖6是與所揭露的一實施範例一致的一示意圖，說明圖2中的脈衝寬度調變器轉換輸出的脈衝寬度調變訊號。 FIG. 6 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the pulse width modulation signal of the pulse width modulator conversion output of FIG.
圖7是與所揭露的一實施範例一致的一示意圖，說明圖2中的功率驅動器驅動第一外部負載和第二外部負載。 7 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the power driver of FIG. 2 driving a first external load and a second external load.
圖8是與所揭露的一實施範例一致的一示意圖，說明一種立體聲訊號驅動的方法。 FIG. 8 is a schematic diagram consistent with an embodiment of the disclosure, illustrating a method of stereo signal driving.
以下，參考伴隨的圖式，詳細說明依據本發明的實施例，俾使本領域者易於瞭解。所述之創作可以採用多種變化的實施方式，當不能只限定於這些實施例。本發明省略已熟知部分(well-known part)的描述，並且相同的參考號於本發明中代表相同的元件。 Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, which are readily understood by those skilled in the art. The authoring of the invention may take a variety of variations, and should not be limited to only those embodiments. The description of the well-known part is omitted in the present invention, and the same reference numerals denote the same elements in the present invention.
本揭露提出一種立體聲訊號驅動的技術，經由接收立體聲訊號的處理，將耳機的中性線也驅動PWM訊號用以取代原有的接地，以達到無須高通濾波器也能達到無直流漏電的要求。圖2是與所揭露的一實施範例一致的一示意圖，說明一種立體聲訊號驅動的裝置。 The present disclosure proposes a stereo signal driving technology. By receiving the stereo signal, the neutral line of the earphone is also driven by the PWM signal to replace the original ground, so that the requirement of no DC leakage can be achieved without a high-pass filter. 2 is a schematic diagram consistent with an embodiment of the disclosure, illustrating a stereo signal driven device.
圖2是一種立體聲訊號驅動的裝置，應用於驅動一第一外部負載和一第二外部負載。如圖2中所示，裝置200包含一三角積分調變器(SDM)210、一編碼轉換器220、一脈衝寬度調變器230、一訊號轉換器240、一第一功率驅動器250、以及一第二功率驅動器260。其中，三角積分調變器210將輸入的一第一脈衝編碼調變(PCM)訊號211和一第二脈衝編碼調變訊號212分別轉換成一第一脈衝密度調變(PDM)訊號213和一第二脈衝密度調變訊號214；編碼轉換器220將第一脈衝密度調變訊號213和第二脈衝密度調變訊號214分別轉換成一第一輸出脈衝密度調變(PDM)訊號221、一第二輸出脈衝密度調變訊號 222和一第三輸出脈衝密度調變訊號223；脈衝寬度調變器230將第一輸出脈衝密度調變訊號221、第二輸出脈衝密度調變訊號222和第三輸出脈衝密度調變訊號223分別轉換成第一脈衝寬度調變(PWM)訊號231、一第二脈衝寬度調變訊號232和一第三脈衝寬度調變訊號233；一訊號轉換器240將第一脈衝寬度調變訊號231、第二脈衝寬度調變訊號232和第三脈衝寬度調變訊號233轉換成一第一驅動訊號241、一第二驅動訊號242和一第三驅動訊號243；第一功率驅動器250接收第一驅動訊號241和第三驅動訊號243來驅動第一外部負載；第二功率驅動器260接收第二驅動訊號242和第三驅動訊號243來驅動該第二外部負載。 2 is a stereo signal driven device for driving a first external load and a second external load. As shown in FIG. 2, the device 200 includes a triangular integral modulator (SDM) 210, a transcoder 220, a pulse width modulator 230, a signal converter 240, a first power driver 250, and a Second power driver 260. The triangular integral modulator 210 converts the input first pulse code modulation (PCM) signal 211 and a second pulse code modulation signal 212 into a first pulse density modulation (PDM) signal 213 and a first The second pulse density modulation signal 214 and the second pulse density modulation signal 214 are respectively converted into a first output pulse density modulation (PDM) signal 221 and a second output. Pulse density modulation signal 222 and a third output pulse density modulation signal 223; the pulse width modulator 230 respectively outputs the first output pulse density modulation signal 221, the second output pulse density modulation signal 222, and the third output pulse density modulation signal 223 Converting into a first pulse width modulation (PWM) signal 231, a second pulse width modulation signal 232, and a third pulse width modulation signal 233; a signal converter 240 modulating the first pulse width signal 231, The second pulse width modulation signal 232 and the third pulse width modulation signal 233 are converted into a first driving signal 241, a second driving signal 242 and a third driving signal 243; the first power driver 250 receives the first driving signal 241 and The third driving signal 243 drives the first external load; the second power driver 260 receives the second driving signal 242 and the third driving signal 243 to drive the second external load.
根據圖2中立體聲訊號驅動的裝置的實施範例，其中三角積分調變器210將輸入的第一脈衝編碼調變訊號211和第二脈衝編碼調變訊號212分別轉換成第一脈衝密度調變訊號213和第二脈衝密度調變訊號214。在第二圖中，三角積分調變器的目的是將輸入的多位元(Bits)脈衝編碼調變訊號轉換成少位元的脈衝密度調變訊號，第一脈衝編碼調變訊號211和第二脈衝編碼調變訊號212代表立體聲雙聲道的左右聲道的脈衝編碼調變訊號，例如各為16位元(bits)或24位元的解析度的脈衝編碼調變碼(PCM Code)。圖3中是與所揭露的一實施範例一致的一示意圖，說明圖2中脈衝編碼調變訊號。在圖3中，橫軸代表各取樣時間點，而縱軸代表各取樣時間點的脈衝編碼調變碼 的大小。 According to the implementation example of the apparatus for driving a stereo signal in FIG. 2, the triangular integral modulator 210 converts the input first pulse code modulation signal 211 and the second pulse code modulation signal 212 into a first pulse density modulation signal, respectively. 213 and a second pulse density modulation signal 214. In the second figure, the purpose of the delta-sigma modulator is to convert the input multi-bit (bits) pulse code modulation signal into a bit-bit pulse density modulation signal, the first pulse code modulation signal 211 and the first The two-pulse code modulation signal 212 represents a pulse-coded modulation signal of the left and right channels of the stereo two-channel, for example, a 16-bit (bits) or 24-bit resolution pulse code modulation code (PCM Code). FIG. 3 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the pulse code modulation signal of FIG. In Fig. 3, the horizontal axis represents each sampling time point, and the vertical axis represents the pulse code modulation code of each sampling time point. the size of.
承上述，而在圖3中轉換後的一第一脈衝密度調變訊號213和一第二脈衝密度調變訊號214可以例如各為3-6位元的脈衝密度調變碼。圖4是與所揭露的一實施範例一致的一示意圖，說明圖2中轉換後的脈衝密度調變訊號。在圖4中，橫軸代表各取樣時間點，而縱軸代表各取樣時間點的脈衝密度調變碼的大小。 In the above, a first pulse density modulation signal 213 and a second pulse density modulation signal 214 converted in FIG. 3 can be, for example, 3-6 bit pulse density modulation codes. 4 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the converted pulse density modulation signal of FIG. In Fig. 4, the horizontal axis represents each sampling time point, and the vertical axis represents the magnitude of the pulse density modulation code at each sampling time point.
根據圖2中立體聲訊號驅動的裝置的實施範例，其中編碼轉換器220將第一脈衝密度調變訊號213和第二脈衝密度調變訊號214分別轉換成一第一輸出脈衝密度調變訊號221、一第二輸出脈衝密度調變訊號222和一第三輸出脈衝密度調變訊號223。圖5是與所揭露的一實施範例一致的一示意圖，說明圖2中的編碼轉換器。在圖5中，輸入的第一脈衝密度調變訊號213和第二脈衝密度調變訊號214依據下列數學式子轉換成三個輸出脈衝密度調變訊號221、222和223：S221=S213-S214 According to an embodiment of the apparatus for driving a stereo signal in FIG. 2, the transcoder 220 converts the first pulse density modulation signal 213 and the second pulse density modulation signal 214 into a first output pulse density modulation signal 221, respectively. The second output pulse density modulation signal 222 and a third output pulse density modulation signal 223. FIG. 5 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the transcoder of FIG. In FIG. 5, the input first pulse density modulation signal 213 and the second pulse density modulation signal 214 are converted into three output pulse density modulation signals 221, 222, and 223 according to the following mathematical formula: S 221 =S 213 -S 214
S222=S214-S213 S 222 =S 214 -S 213
S223=-S213-S214其中S213和S214分別代表脈衝密度調變訊號213和第二脈衝密度調變訊號214，S221、S222和S223分別代表第一輸出脈衝密度調變訊號221、第二輸出脈衝密度調變訊號222和第三輸出脈衝密度 調變訊號223，而“-”代表負值或相減。 S 223 = -S 213 -S 214, wherein S 213 and S 214 represent a pulse density modulation signal 213 and a second pulse density modulation signal 214, respectively, S 221 , S 222 and S 223 represent the first output pulse density modulation, respectively. The signal 221, the second output pulse density modulation signal 222 and the third output pulse density modulation signal 223, and "-" represent a negative value or subtraction.
根據圖2中立體聲訊號驅動的裝置的實施範例，其中脈衝寬度調變器230將第一輸出脈衝密度調變訊號221、第二輸出脈衝密度調變訊號222和第三輸出脈衝密度調變訊號223分別轉換成第一脈衝寬度調變訊號231、一第二脈衝寬度調變訊號232和一第三脈衝寬度調變訊號233。圖6是與所揭露的一實施範例一致的-示意圖，說明第二圖中的脈衝寬度調變器轉換輸出的脈衝寬度調變訊號。在圖6中，橫軸代表各取樣時間點，而縱軸代表各取樣時間點的脈衝寬度調變碼的大小，脈衝寬度調變訊號的寬度是與相對應的脈衝密度調變訊號值成正比。 According to an embodiment of the apparatus for driving a stereo signal in FIG. 2, the pulse width modulator 230 converts the first output pulse density modulation signal 221, the second output pulse density modulation signal 222, and the third output pulse density modulation signal 223. The first pulse width modulation signal 231, a second pulse width modulation signal 232, and a third pulse width modulation signal 233 are respectively converted. Figure 6 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the pulse width modulation signal of the pulse width modulator switching output of the second figure. In FIG. 6, the horizontal axis represents each sampling time point, and the vertical axis represents the size of the pulse width modulation code at each sampling time point, and the width of the pulse width modulation signal is proportional to the corresponding pulse density modulation signal value. .
根據圖2中的實施範例，訊號轉換器240將第一脈衝寬度調變訊號231、第二脈衝寬度調變訊號232和第三脈衝寬度調變訊號233轉換成一第一驅動訊號241、一第二驅動訊號242和一第三驅動訊號243。訊號轉換器輸出的各個驅動訊號的大小與其相對應的脈衝寬度調變訊號的寬度成正比。因此訊號轉換器可以例如，但不限於是一計數器，依據一時鐘將輸入的一脈衝寬度調變訊號的脈衝寬度進行計數，再將計數值轉換成相對應驅動訊號的大小。 According to the embodiment in FIG. 2, the signal converter 240 converts the first pulse width modulation signal 231, the second pulse width modulation signal 232, and the third pulse width modulation signal 233 into a first driving signal 241, a second The driving signal 242 and a third driving signal 243. The size of each drive signal output by the signal converter is proportional to the width of the corresponding pulse width modulation signal. Therefore, the signal converter can, for example, but not limited to, a counter, counts the pulse width of the input pulse width modulation signal according to a clock, and converts the count value into a corresponding driving signal size.
根據圖2中的實施範例，最後第一功率驅動器250 接收第一驅動訊號241和第三驅動訊號243來驅動第一外部負載；第二功率驅動器260接收第二驅動訊號242和第三驅動訊號243來驅動第二外部負載。圖7是與所揭露的一實施範例一致的-示意圖，說明圖2中的功率驅動器驅動第一外部負載和第二外部負載。其中，第一功率驅動器250將第一驅動訊號241和第三驅動訊號243來驅動第一外部負載的兩端，而第二功率驅動器260將第二驅動訊號242和第三驅動訊號243來驅動第二外部負載的兩端。 According to the implementation example in FIG. 2, the last first power driver 250 The first driving signal 241 and the third driving signal 243 are received to drive the first external load; the second power driver 260 receives the second driving signal 242 and the third driving signal 243 to drive the second external load. 7 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the power driver of FIG. 2 driving a first external load and a second external load. The first power driver 250 drives the first driving signal 241 and the third driving signal 243 to drive both ends of the first external load, and the second power driver 260 drives the second driving signal 242 and the third driving signal 243 to drive the first driving signal 242 and the third driving signal 243. Two ends of the external load.
根據另一個實施範例，圖8說明一種立體聲訊號驅動的方法，應用於驅動一第一外部負載和一第二外部負載，此方法包含：使用一三角積分調變器將輸入的一第一脈衝編碼調變訊號和一第二脈衝編碼調變訊號分別轉換成一第一脈衝密度調變訊號和一第二脈衝密度調變訊號，如步驟810所示；使用一編碼轉換器將第一脈衝密度調變訊號和第二脈衝密度調變訊號分別轉換成一第一輸出脈衝密度調變訊號、一第二輸出脈衝密度調變訊號和一第三輸出脈衝密度調變訊號，如步驟820所示；使用一脈衝寬度調變器將第一輸出脈衝密度調變訊號、第二輸出脈衝密度調變訊號和第三輸出脈衝密度調變訊號分別轉換成第一脈衝寬度調變訊號、一第二脈衝寬度調變訊號和一第三脈衝寬度調變訊號，如步驟830所示；使用一訊號轉換器將第一脈衝寬度調變訊號、第二脈衝寬度調變訊號和第三脈衝寬度調變訊號轉換成一第一驅動訊號、一第二驅動訊號和 一第三驅動訊號，如步驟840所示；使用一第一功率驅動器，接收第一驅動訊號和該第三驅動訊號來驅動第一外部負載，如步驟850所示；以及使用一第二功率驅動器，接收第二驅動訊號和第三驅動訊號來驅動第二外部負載，如步驟860所示。 According to another embodiment, FIG. 8 illustrates a method of driving a stereo signal for driving a first external load and a second external load, the method comprising: encoding a first pulse of the input using a triangular integral modulator The modulation signal and a second pulse code modulation signal are respectively converted into a first pulse density modulation signal and a second pulse density modulation signal, as shown in step 810; using a transcoder to modulate the first pulse density The signal and the second pulse density modulation signal are respectively converted into a first output pulse density modulation signal, a second output pulse density modulation signal, and a third output pulse density modulation signal, as shown in step 820; using a pulse The width modulator converts the first output pulse density modulation signal, the second output pulse density modulation signal, and the third output pulse density modulation signal into a first pulse width modulation signal and a second pulse width modulation signal, respectively. And a third pulse width modulation signal, as shown in step 830; using a signal converter to adjust the first pulse width modulation signal and the second pulse width The variable signal and the third pulse width modulation signal are converted into a first driving signal, a second driving signal, and a third driving signal, as shown in step 840; receiving a first driving signal and the third driving signal to drive the first external load using a first power driver, as shown in step 850; and using a second power driver Receiving a second driving signal and a third driving signal to drive the second external load, as shown in step 860.
如步驟810所示之三角積分調變器的目的是將輸入的多位元(Bits)脈衝編碼調變訊號轉換成少位元的脈衝密度調變訊號，第一脈衝編碼調變訊號和第二脈衝編碼調變訊號代表立體聲雙聲道的左右聲道的脈衝編碼調變訊號，例如各為16位元(bits)或24位元的解析度的脈衝編碼調變碼(PCM Code)。 The purpose of the delta-sigma modulator as shown in step 810 is to convert the input multi-bit (bits) pulse code modulation signal into a small bit pulse density modulation signal, the first pulse code modulation signal and the second The pulse code modulation signal represents a pulse code modulation signal of the left and right channels of the stereo two channels, for example, a 16-bit (bits) or 24-bit resolution pulse code modulation code (PCM Code).
如步驟820所示之使用編碼轉換器將輸入的第一脈衝密度調變訊號和第二脈衝密度調變訊號依據下列數學式子轉換成三個輸出脈衝密度調變訊號：S221=S213-S214 As shown in step 820, the input first pulse density modulation signal and the second pulse density modulation signal are converted into three output pulse density modulation signals according to the following mathematical formula using a transcoder: S 221 =S 213 - S 214
S222=S214-S213 S 222 =S 214 -S 213
S223=-S213-S214其中S213和S214分別代表脈衝密度調變訊號和第二脈衝密度調變訊號，S221、S222和S223分別代表第一輸出脈衝密度調變訊號、第二輸出脈衝密度調變訊號和第三輸出脈衝密度調變訊號，而“-”代表負值或相減。 S 223 = -S 213 -S 214, wherein S 213 and S 214 represent a pulse density modulation signal and a second pulse density modulation signal, respectively, and S 221 , S 222 and S 223 respectively represent the first output pulse density modulation signal, The second output pulse density modulation signal and the third output pulse density modulation signal, and "-" represents a negative value or subtraction.
如步驟830所示之使用脈衝寬度調變器將第一輸 出脈衝密度調變訊號、第二輸出脈衝密度調變訊號和第三輸出脈衝密度調變訊號分別轉換成第一脈衝寬度調變訊號、一第二脈衝寬度調變訊號和一第三脈衝寬度調變訊號。其中脈衝寬度調變訊號的寬度是與相對應脈衝密度調變訊號值成正比。 As shown in step 830, the first loss is used using a pulse width modulator. The pulse density modulation signal, the second output pulse density modulation signal and the third output pulse density modulation signal are respectively converted into a first pulse width modulation signal, a second pulse width modulation signal and a third pulse width adjustment. Change signal. The width of the pulse width modulation signal is proportional to the corresponding pulse density modulation signal value.
如步驟840所示之使用訊號轉換器將第一脈衝寬度調變訊號、第二脈衝寬度調變訊號和第三脈衝寬度調變訊號轉換成一第一驅動訊號、一第二驅動訊號和一第三驅動訊號。訊號轉換器輸出的各個驅動訊號的大小與其相對應的脈衝寬度調變訊號的寬度成正比。因此訊號轉換器可以例如，但不限於是一計數器，依據一時鐘將輸入的一脈衝寬度調變訊號的脈衝寬度進行計數，再將計數值轉換成相對應驅動訊號的大小。 As shown in step 840, the first pulse width modulation signal, the second pulse width modulation signal, and the third pulse width modulation signal are converted into a first driving signal, a second driving signal, and a third by using a signal converter. Drive signal. The size of each drive signal output by the signal converter is proportional to the width of the corresponding pulse width modulation signal. Therefore, the signal converter can, for example, but not limited to, a counter, counts the pulse width of the input pulse width modulation signal according to a clock, and converts the count value into a corresponding driving signal size.
如步驟850所示之使用第一功率驅動器接收第一驅動訊號和第三驅動訊號來驅動第一外部負載；以及如步驟860所示之使用第二功率驅動器接收第二驅動訊號和第三驅動訊號243來驅動第二外部負載。其中第一功率驅動器將第一驅動訊號和第三驅動訊號來驅動第一外部負載的兩端，而第二功率驅動器將第二驅動訊號和第三驅動訊號來驅動第二外部負載的兩端。 Receiving the first driving signal and the third driving signal to drive the first external load using the first power driver as shown in step 850; and receiving the second driving signal and the third driving signal by using the second power driver as shown in step 860 243 to drive the second external load. The first power driver drives the first driving signal and the third driving signal to drive both ends of the first external load, and the second power driver drives the second driving signal and the third driving signal to drive both ends of the second external load.
綜上所述，本揭露提出一種本揭露提出一種立體聲訊號驅動的技術，經由接收立體聲訊號的處理，以改善驅動 音頻訊號的失真及直流漏電的缺點。 In summary, the present disclosure proposes a technique for driving a stereo signal, which improves the driving by receiving a stereo signal. Distortion of audio signals and shortcomings of DC leakage.
惟，以上所揭露之圖示及說明，僅為本發明之較佳實施例而已，非為用以限定本發明之實施，大凡熟悉該項技藝之人士其所依本發明之精神，所作之變化或修飾，皆應涵蓋在以下本案之申請專利範圍內。 The illustrations and descriptions of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the implementation of the present invention, and those who are familiar with the art are subject to the changes in the spirit of the present invention. Or the modifications should be covered by the following patent application in this case.
200‧‧‧立體聲訊號驅動的裝置 200‧‧‧ Stereo signal driven device
210‧‧‧三角積分調變器 210‧‧‧Triangular integral modulator
211‧‧‧第一脈衝編碼調變訊號 211‧‧‧First pulse code modulation signal
212‧‧‧第二脈衝編碼調變訊號 212‧‧‧Second pulse code modulation signal
213‧‧‧第一脈衝密度調變訊號 213‧‧‧First pulse density modulation signal
214‧‧‧第二脈衝密度調變訊號 214‧‧‧Second pulse density modulation signal
220‧‧‧編碼轉換器 220‧‧‧Code Converter
221‧‧‧第一輸出脈衝密度調變訊號 221‧‧‧First output pulse density modulation signal
222‧‧‧第二輸出脈衝密度調變訊號 222‧‧‧Second output pulse density modulation signal
223‧‧‧第三輸出脈衝密度調變訊號 223‧‧‧ Third output pulse density modulation signal
230‧‧‧脈衝寬度調變器 230‧‧‧ pulse width modulator
231‧‧‧第一脈衝寬度調變訊號 231‧‧‧First pulse width modulation signal
232‧‧‧第二脈衝寬度調變訊號 232‧‧‧Second pulse width modulation signal
240‧‧‧訊號轉換器 240‧‧‧Signal Converter
241‧‧‧第一驅動訊號 241‧‧‧First drive signal
242‧‧‧第二驅動訊號 242‧‧‧Second drive signal
243‧‧‧第三驅動訊號 243‧‧‧ Third drive signal
250‧‧‧第一功率驅動器 250‧‧‧First power driver
260‧‧‧第二功率驅動器 260‧‧‧second power driver
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|---|---|
| CN106357272A (en) | 2017-01-25 |
| TW201703545A (en) | 2017-01-16 |
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