TWI839664B - Audio signal generation method, audio playback device, computer readable medium and uses thereof - Google Patents
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Abstract
Description
本發明是有關於一種音頻產生技術，特別是指一種音頻訊號產生方法、音頻播放裝置、電腦可讀取媒體及其用途。The present invention relates to an audio generation technology, and in particular to an audio signal generation method, an audio playback device, a computer-readable medium and uses thereof.
現今雖有號稱有助於全腦開發之音樂治療產品，然而其僅是將自然音樂加上輕鬆音樂混成，並無確實之理論基礎，效果亦低微。Although there are music therapy products that claim to help develop the whole brain, they are simply a mixture of natural music and relaxing music, without a solid theoretical basis and with minimal effect.
本發明一實施例提出一種音頻訊號產生方法，包括：依據複數頻率之正弦波訊號形成之複數基礎音頻；及混合該些基礎音頻為一非線性腦動力音頻；其中，該些頻率位於0至100赫茲但不包括0赫茲的一頻率範圍。An embodiment of the present invention provides a method for generating an audio signal, comprising: forming a plurality of basic audio frequencies according to a sinusoidal wave signal of a plurality of frequencies; and mixing the basic audio frequencies into a nonlinear brain power audio frequency; wherein the frequencies are in a frequency range of 0 to 100 Hz but not including 0 Hz.
本發明一實施例提出一種音頻播放裝置，包括一處理器，該處理器載入一電腦程式，以執行前述之音頻訊號產生方法。An embodiment of the present invention provides an audio playback device, including a processor, wherein a computer program is loaded into the processor to execute the aforementioned audio signal generation method.
本發明一實施例提出一種電腦可讀取媒體，儲存有混合複數基礎音頻的一非線性腦動力音頻，其中該些基礎音頻的頻率位於0至100赫茲但不包括0赫茲的一頻率範圍。An embodiment of the present invention provides a computer-readable medium storing a nonlinear brain power audio mixed with a plurality of basic audios, wherein the frequencies of the basic audios are within a frequency range of 0 to 100 Hz but not including 0 Hz.
本發明一實施例提出一種音頻播放裝置，包括前述之電腦可讀取媒體。An embodiment of the present invention provides an audio playback device, including the aforementioned computer-readable medium.
本發明一實施例提出一種前述電腦可讀取媒體之用途，其用於產生用於刺激大腦神經元恢復的聲音療法音頻訊號。One embodiment of the present invention provides a use of the aforementioned computer-readable medium for generating sound therapy audio signals for stimulating brain neuron recovery.
根據本發明一些實施例之音頻訊號產生方法、音頻播放裝置、電腦可讀取媒體及其用途，可產生非線性腦動力音頻，具有刺激大腦神經元恢復的效果，可用於視力保健、紓緩情緒、大腦開發及提升專注力之音樂治療應用。According to some embodiments of the present invention, the audio signal generation method, the audio playback device, the computer-readable medium and the use thereof can generate nonlinear brain power audio, which has the effect of stimulating the recovery of brain neurons and can be used for music therapy applications such as vision care, emotional relief, brain development and improving concentration.
參照圖1，係為本發明一實施例之音頻訊號產生方法流程圖。首先，依據複數頻率之正弦波訊號形成之複數基礎音頻（步驟S01）。也就是說，每一基礎音頻均為不同頻率之正弦波訊號。所述頻率是位於0至100赫茲但不包括0赫茲的一頻率範圍。在一些實施例中，所述頻率可分別為20、40、60及80赫茲。在另一些實施例中，所述頻率可分別為30、50、70及90赫茲。接著，在步驟S02中，混合此些基礎音頻，而可形成一非線性腦動力音頻。Referring to FIG. 1 , it is a flow chart of an audio signal generation method of an embodiment of the present invention. First, a plurality of basic audio frequencies are formed based on a sine wave signal of a complex frequency (step S01). That is, each basic audio frequency is a sine wave signal of a different frequency. The frequency is a frequency range of 0 to 100 Hz but does not include 0 Hz. In some embodiments, the frequency may be 20, 40, 60 and 80 Hz, respectively. In other embodiments, the frequency may be 30, 50, 70 and 90 Hz, respectively. Then, in step S02, these basic audio frequencies are mixed to form a nonlinear brain power audio frequency.
參照圖2，係為本發明一實施例之音頻播放裝置之架構示意圖。音頻播放裝置可例如為藍芽耳機、多媒體播放器，其包括處理器11、儲存單元13及音頻輸出單元14。儲存單元13儲存有電腦程式12，以使處理器11載入電腦程式12之後，執行本發明之音頻訊號產生方法。音頻輸出單元14用以輸出產生的音頻訊號，其係可經由聲波形式或電訊號形式輸出，視音頻輸出單元14的類型而定。在一些實施例中，音頻輸出單元14為揚聲器、發聲單體或音源埠等。Referring to FIG. 2 , it is a schematic diagram of the structure of an audio playback device of an embodiment of the present invention. The audio playback device may be, for example, a Bluetooth headset or a multimedia player, and includes a
在一些實施例中，處理器11可以微處理器、微控制器、晶片上系統（SoC）等具電腦程式12執行能力的一個或多個處理器實現。In some embodiments, the
在一些實施例中，儲存單元13可例如為唯讀記憶體（ROM）、電子可抹除可程式設計ROM（EEPROM）、快閃記憶體等非揮發式記憶體。In some embodiments, the
在一些實施例中，儲存單元13是內建於處理器11中。In some embodiments, the
參照圖3，係為本發明一實施例之非線性腦動力音頻之效果評估方法流程圖。首先，播放非線性腦動力音頻予一個或多個受測者，同時量測受測者之腦電圖（步驟S21）。接著，檢測腦電圖之腦波同步率或/及腦能量變化，以客觀評估非線性腦動力音頻對大腦之刺激反應（步驟S22）。腦波訊號可先進行訊號前處理，以濾除不需要的頻率訊號，如雜訊、眼動訊號、心跳訊號等。在一些實施例中，腦電圖使用的電極包括F4、F8、FT7、FC3、FCZ、FC4、FT8、T3、C3、CZ、C4、T4、TP7、CP3、CPZ、CP4、TP8、T5、P3、PZ、P4、T6、O1、OZ、O2。Referring to FIG. 3 , it is a flow chart of a method for evaluating the effect of nonlinear brain power audio according to an embodiment of the present invention. First, nonlinear brain power audio is played to one or more subjects, and the EEG of the subjects is measured at the same time (step S21). Then, the EEG brain wave synchronization rate and/or brain energy changes are detected to objectively evaluate the stimulation response of the nonlinear brain power audio to the brain (step S22). The brain wave signal can be pre-processed to filter out unnecessary frequency signals, such as noise, eye movement signals, heartbeat signals, etc. In some embodiments, the electrodes used in the EEG include F4, F8, FT7, FC3, FCZ, FC4, FT8, T3, C3, CZ, C4, T4, TP7, CP3, CPZ, CP4, TP8, T5, P3, PZ, P4, T6, O1, OZ, and O2.
參照圖4，係為本發明一實施例之腦能量變化圖，腦波能量由高至低以紅色至藍色表示。測試過程可分為三個階段。第一階段為無聲休息階段，在此階段中不輸出音頻。第二階段為音頻刺激階段，在此階段中持續輸出非線性腦動力音頻。第三階段為無聲休息階段，同樣於此階段中不輸出音頻。該三階段分別持續一段時間，例如第一階段持續3分鐘、第二階段持續12分鐘、第三階段持續3分鐘。如圖4所示，第一階段的腦波能量相較於第二、三階段的腦波能量為高，可見受測者接受到非線性腦動力音頻的刺激過程與其後可使大腦休息、減少運作，發揮刺激大腦神經元恢復的作用。Refer to Figure 4, which is a brain energy change diagram of an embodiment of the present invention, where brain wave energy is represented by red to blue from high to low. The test process can be divided into three stages. The first stage is a silent rest stage, during which no audio is output. The second stage is an audio stimulation stage, during which nonlinear brain power audio is continuously output. The third stage is a silent rest stage, during which no audio is output. The three stages last for a period of time respectively, for example, the first stage lasts 3 minutes, the second stage lasts 12 minutes, and the third stage lasts 3 minutes. As shown in Figure 4, the brainwave energy in the first stage is higher than that in the second and third stages. It can be seen that the subjects are stimulated by the nonlinear brain power audio frequency and the subsequent rest of the brain and reduced operation can play a role in stimulating the recovery of brain neurons.
參照圖5，係為本發明一實施例之腦同步率指標示意圖。橫軸為時間，縱軸為腦波同步率指標因子。左腦以紅色線條呈現，右腦以藍色線條呈現。可以看到第二階段左腦及右腦的腦波同步率指標因子皆上升，而在第三階段則又下降，可證明非線性腦動力音頻的刺激確實具有其效能。腦同步率指標可透過吾人發表之期刊論文-Applied Mechanics and Materials Vol. 311 (2013) pp 491-496所記載的方法計算而得。Refer to FIG5 , which is a schematic diagram of the brain synchronization rate index of an embodiment of the present invention. The horizontal axis is time, and the vertical axis is the brain wave synchronization rate index factor. The left brain is presented as a red line, and the right brain is presented as a blue line. It can be seen that the brain wave synchronization rate index factors of the left and right brains both increase in the second stage, and then decrease in the third stage, which can prove that the stimulation of nonlinear brain dynamic audio frequency does have its effectiveness. The brain synchronization rate index can be calculated by the method described in our journal article - Applied Mechanics and Materials Vol. 311 (2013) pp 491-496.
參照圖6，係為本發明一實施例之基礎音頻之頻率選定方法流程圖。首先，於前述頻率範圍中選取一候選頻率（步驟S31），例如20赫茲。接著，依據候選頻率之正弦波訊號形成之一候選音頻（步驟S32）。在步驟S33與步驟S34分別與前述步驟S21與步驟S22類似，差異在於，於此使用的音頻僅為單一候選頻率的候選音頻，以找出哪一或哪些頻率的音頻是可對大腦引起作用的。在步驟S33中，播放候選音頻予一個或多個受測者，同時量測受測者之腦電圖。接著，檢測腦電圖之腦波同步率或/及腦能量變化，以選擇對大腦產生反應的候選頻率為基礎音頻（步驟S34）。如此，可找出非線性腦波零射散匹配的基礎音頻。Referring to FIG. 6 , it is a flow chart of a frequency selection method of a basic audio frequency of an embodiment of the present invention. First, a candidate frequency is selected from the aforementioned frequency range (step S31), for example, 20 Hz. Then, a candidate audio frequency is formed according to the sine wave signal of the candidate frequency (step S32). Steps S33 and S34 are similar to the aforementioned steps S21 and S22, respectively, except that the audio frequency used here is only a candidate audio frequency of a single candidate frequency, in order to find out which audio frequency or frequencies can cause an effect on the brain. In step S33, the candidate audio frequency is played to one or more subjects, and the EEG of the subjects is measured at the same time. Next, the brain wave synchronization rate and/or brain energy change of the electroencephalogram is detected to select a candidate frequency that reacts to the brain as the basic audio frequency (step S34). In this way, the basic audio frequency that matches the nonlinear brain wave zero dispersion can be found.
參照圖7，係為本發明另一實施例之音頻訊號產生方法流程圖。在一些實施例中，在前述步驟S02之後，還可以執行步驟S03，混合至少一噪音音頻至非線性腦動力音頻中。噪音音頻可例如為布朗噪音或粉紅噪音。如此，可複雜化非線性腦動力音頻，以增加盜用難度，同時可添加低頻訊號，使訊號更為自然。Referring to FIG. 7 , it is a flow chart of an audio signal generation method of another embodiment of the present invention. In some embodiments, after the aforementioned step S02, step S03 may be further performed to mix at least one noise audio into the nonlinear brain dynamic audio. The noise audio may be, for example, Brown noise or pink noise. In this way, the nonlinear brain dynamic audio may be complicated to increase the difficulty of theft, and at the same time, a low-frequency signal may be added to make the signal more natural.
在一些實施例中，還可對非線性腦動力音頻疊加一混沌加密訊號（步驟S04）。藉此，可隱藏非線性腦動力音頻，避免被盜用。混沌加密訊號之頻率應避免與前述基礎音頻的頻率重疊。In some embodiments, a chaotic encryption signal may be superimposed on the nonlinear brain power audio (step S04). In this way, the nonlinear brain power audio can be hidden to prevent it from being stolen. The frequency of the chaotic encryption signal should avoid overlapping with the frequency of the aforementioned basic audio.
在一些實施例中，還可對經過前述步驟S02至S04處理、經前述步驟S02至S03處理而不經過前述步驟S04處理、經過前述步驟S02與S04處理而不經過前述步驟S03處理、或由前述步驟S02獲得而不經過前述步驟S03至S04處理的非線性腦動力音頻，疊加音樂訊號（步驟S05），使得受測者在聆聽音頻時不會感到無聊。In some embodiments, a music signal may be superimposed (step S05) on the nonlinear brainpower audio that has been processed by the aforementioned steps S02 to S04, that has been processed by the aforementioned steps S02 to S03 but not processed by the aforementioned step S04, that has been processed by the aforementioned steps S02 and S04 but not processed by the aforementioned step S03, or that has been obtained by the aforementioned step S02 but not processed by the aforementioned steps S03 to S04, so that the subject will not feel bored when listening to the audio.
在一些實施例中，還可將非線性腦動力音頻轉換為雙聲道訊號（步驟S06），其中左聲道訊號與右聲道訊號之相位相差180度。使得若經盜錄音頻，會因為左右聲道同相、反相相消，而無法獲得完整的音頻，以避免被盜用。In some embodiments, the nonlinear brain power audio can be converted into a dual-channel signal (step S06), wherein the phase difference between the left channel signal and the right channel signal is 180 degrees. This prevents the audio from being stolen because the left and right channels are in phase or out of phase with each other and the complete audio cannot be obtained.
在一些實施例中，可預先執行前述音頻訊號產生方法，將產生的非線性腦動力音頻儲存至電腦可讀取媒體中。電腦可讀取媒體可例如為前述儲存單元13，或其他獨立於前述音頻播放裝置之外的儲存媒體（如隨身碟、光碟等）。當經由讀取並播放所儲存的非線性腦動力音頻時，可產生用於刺激大腦神經元恢復的聲音療法音頻訊號。In some embodiments, the aforementioned audio signal generation method can be pre-executed to store the generated nonlinear brain power audio in a computer-readable medium. The computer-readable medium can be, for example, the
綜上所述，本發明提出之音頻訊號產生方法、音頻播放裝置、電腦可讀取媒體，可產生非線性腦動力音頻，具有刺激大腦神經元恢復的效果，可用於視力保健、紓緩情緒、大腦開發及提升專注力之音樂治療應用。In summary, the audio signal generation method, audio playback device, and computer-readable medium proposed in the present invention can generate nonlinear brain power audio, which has the effect of stimulating the recovery of brain neurons and can be used for music therapy applications such as vision care, emotional relief, brain development, and improving concentration.
11:處理器 12:電腦程式 13:儲存單元 14:音頻輸出單元 S01:依據複數頻率之正弦波訊號形成之複數基礎音頻 S02:混合基礎音頻為一非線性腦動力音頻 S03:混合至少一噪音音頻至非線性腦動力音頻中 S04:對非線性腦動力音頻疊加一混沌加密訊號 S05:對非線性腦動力音頻疊加音樂訊號 S06:將非線性腦動力音頻轉換為雙聲道訊號，其中左聲道訊號與右聲道訊號之相位相差180度 S21:播放非線性腦動力音頻予受測者，同時量測受測者之腦電圖 S22:檢測腦電圖之腦波同步率或/及腦能量變化，以客觀評估非線性腦動力音頻對大腦之刺激反應 S31:於頻率範圍中選取一候選頻率 S32:依據候選頻率之正弦波訊號形成之一候選音頻 S33:播放候選音頻予受測者，同時量測受測者之腦電圖 S34:檢測腦電圖之腦波同步率或/及腦能量變化，以選擇對大腦產生反應的候選頻率為基礎音頻 11: Processor 12: Computer program 13: Storage unit 14: Audio output unit S01: Complex basic audio formed according to complex frequency sine wave signal S02: Mix basic audio into a nonlinear brain power audio S03: Mix at least one noise audio into the nonlinear brain power audio S04: Superimpose a chaotic encryption signal on the nonlinear brain power audio S05: Superimpose music signal on the nonlinear brain power audio S06: Convert the nonlinear brain power audio into a dual-channel signal, wherein the phase difference between the left channel signal and the right channel signal is 180 degrees S21: Play nonlinear brain power audio to the subject and measure the EEG of the subject at the same time S22: Detect the EEG brain wave synchronization rate and/or brain energy changes to objectively evaluate the stimulation response of the nonlinear brain power audio to the brain S31: Select a candidate frequency from the frequency range S32: Form a candidate audio based on the sine wave signal of the candidate frequency S33: Play the candidate audio to the subject and measure the EEG of the subject at the same time S34: Detect the EEG brain wave synchronization rate and/or brain energy changes to select the candidate frequency that responds to the brain as the basis audio
[圖1]係為本發明一實施例之音頻訊號產生方法流程圖。 [圖2]係為本發明一實施例之音頻播放裝置之架構示意圖。 [圖3]係為本發明一實施例之非線性腦動力音頻之效果評估方法流程圖。 [圖4]係為本發明一實施例之腦能量變化圖。 [圖5]係為本發明一實施例之腦同步率指標示意圖。 [圖6]係為本發明一實施例之基礎音頻之頻率選定方法流程圖。 [圖7]係為本發明另一實施例之音頻訊號產生方法流程圖。 [Figure 1] is a flow chart of the audio signal generation method of an embodiment of the present invention. [Figure 2] is a schematic diagram of the structure of the audio playback device of an embodiment of the present invention. [Figure 3] is a flow chart of the effect evaluation method of nonlinear brain power audio of an embodiment of the present invention. [Figure 4] is a brain energy change diagram of an embodiment of the present invention. [Figure 5] is a schematic diagram of the brain synchronization rate index of an embodiment of the present invention. [Figure 6] is a flow chart of the frequency selection method of the basic audio of an embodiment of the present invention. [Figure 7] is a flow chart of the audio signal generation method of another embodiment of the present invention.
S01:依據複數頻率之正弦波訊號形成之複數基礎音頻 S01: Complex basic audio generated by complex frequency sine wave signals
S02:混合基礎音頻為一非線性腦動力音頻 S02: Mixing basic audio into a nonlinear brain power audio
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