[物] 基頻，[物] 基本頻率
Trumpeters alter fundamental frequency by modifying the lip tension and by pressing the valves to change the effective length of the tubes.
小號手可以藉由改變雙唇的張力來增減基頻，按下與放開活門則可以改變有效管長。
The chords the students liked best have frequencies with that harmonic relationship, too - all the frequencies are integer multiples of a common fundamental frequency.
大學生們喜愛的和弦也都有着最好的諧振關系——所有的諧振頻率都是一個常見基頻的整數倍數。
The numerical results indicate that the higher-order mass matrices have a negligible influence on the fundamental frequency, but they affect the frequencies of higher mode vibrations considerably.
數值實驗結果表明：高階質量矩陣對橫向振動基頻及低頻的影響可忽略不計，但它們對高階橫向振動頻率有很大的影響。
The component having the lowest frequency in a complex vibration (fundamental frequency or first harmonic).
複雜振動中頻率最低的成分（基頻或一次諧波）。
Based on the dynamic balancing of rigid rotors, an integral digital tracking filter method is put forward for fundamental frequency detection.
以剛性轉子現場動平衡為背景，提出了用于基頻檢測的積分型數字跟蹤濾波法。
It is shown that the offset of propulsion force and the lower natural fundamental frequency are caused by asymmetry of turbopump and weakness of connection stiffness between propulsion and frame.
研究表明，渦輪泵不對稱以及發動機與機架之間連接剛度弱是引起推力偏心和基頻固有頻率偏低的主要原因。
Refraction correction carrier phase measurements is composition of two different sets of fundamental frequency wide-lane carrier phase measurement.
折射校正載波相位測量是由兩組不同的基本頻率寬巷載波相位測量組成。
It is verified experimentally that convergent resonance tube is better than uniform section type on suppressing fundamental frequency energy drift.
從實驗上驗證了把等截面諧振管變為變截面諧振管有助于對基頻能量漂移的抑制。
The system has picked up unbalanced (fundamental frequency) signal amplitude and phase accurately by adopting the fourth order band-pass following filter controlled by phase-lock loop and FFT.
系統設計中采用鎖相環控制的四階帶通跟蹤濾波、FFT實現了不平衡（基頻）信號幅值和相位的精确提取。
The filter has no fundamental frequency decay and phase delay, and all harmonics above2nd order are filtered.
該濾波器在基頻處的幅值無衰減，相位無延時，能将2次以上的諧波全部濾掉。
An adaptive line enhancer based on the above notch filter extracts the fundamental frequency signal from noisy data.
采用自適應譜線增強器從含有噪聲的數據中提取出基頻信號。
There was always fundamental frequency component in the SABEP to two component complex tones, whether the difference frequency is equal to the fundamental or twice the fundamental.
對雙組分諧波複合音，無論其間差頻等于基頻或基頻的兩倍，其誘發反應頻譜中均出現基頻成分。
Finally, the fundamental frequency estimation under different PQ disturbances condition, such as harmonics, voltage fluctuations, etc, is analyzed by simulation respectively.
并運用大量仿真，對本方法在諧波、電壓波動等幹擾環境下基本頻率估計的有效性進行驗證。
The average magnitude of this conversion function in frequency domain represents GVE, and the variation of the magnitude in fundamental frequency is identical to AC/DC value.
頻域平均聲門發聲效率反映了物理定義上的聲門發聲效率的變化，而聲門基頻發聲效率的變化與AC／DC比值變化一緻。
The results shows that the fundamental frequency of the model which takes the combined activate into consideration reduced evidently, and the fundamental period prolonged evidently.
研究結果表明，考慮地基土、砂礫石墊層、上部結構共同作用時，結構的基本頻率明顯減小，相應的基本周期明顯延長；
Experimentally the spectrum of the sound field radiated by the cracked plate on collision is measured and the fundamental frequency is determined.
實驗上用小球撞擊法測定了裂紋圓闆的輻射聲場頻譜，并得出了譜的基頻。
Objective To study the vocal parameters, including fundamental frequency, base, vocal range, jitter, in patients with hypertrophic plica vertricularis.
目的探讨室帶肥厚患者的嗓音參數，包括頻率微擾百分值、基頻等，分析室帶是否參與發音。
Influence of factors on fundamental frequency such as tapering coefficient, counterweight on tower top and elastic support were discussed.
分析了附加質量、變截面系數和彈性約束等因素對結構基頻的影響。
The relationship between the fundamental frequency discount and the relative stiffness ratio was obtained by data fitting.
根據試驗結果得到鋼框架模型基頻折減率和上部結構與地基相對剛度比的關系式。
This paper analyzes the condition in which HVDC system reaches the limit of power transmission with fundamental frequency quantities.
利用一種常用的簡化HVDC輸電系統模型，基于基頻的系統變量分析了直流系統功率傳送達到極限的條件。
Finally, the fundamental frequency estimation under different PQ disturbances condition, such as harmonics, voltage.
提出了一種電能質量幹擾環境下的電力系統基本頻率估計方法。
Results show the cable wind-proof wire may greatly meliorate integral structural rigidity and improves the self-vibration fundamental frequency and the effect is quite obvious.
結果表明，設置纜風索能大幅提升結構整體剛度，從而使結構自振基頻得到提高，且效果明顯。
The experimental items include the fundamental frequency (Fo), the rimal duration, the amplitude and the formants.
聲學實驗項目包括基本頻率、音長、音強和共振峰。
For the first time, it is proposed that the of nonlinear damping force of ER fluid is made up of fundamental frequency and higher harmonics which are odd times of fundamental frequency.
提出電流變流體的非線性阻尼力的頻譜是由基頻和頻率為基頻奇數倍的高次諧波分量組成。
Characteristic curves of the fundamental frequency varying with the central amplitude are presented for some given values of the temperature rise.
在給定不同溫度載荷參數時，獲得了對稱正交鋪設複合材料矩形層合闆的基頻與中心無量綱振幅之間的特征關系曲線。
|basic frequency;基頻，[物]基本頻率
基頻（fundamental frequency）是周期性信號中最底層的振動頻率，也是該信號中能量最大的頻率成分。在物理學和工程學領域，基頻定義為信號周期倒數對應的頻率值，數學表達式為： $$ f_0 = frac{1}{T} $$ 其中$T$表示信號的周期。基頻決定了聲音的音調特征，例如人耳感知的樂音高低主要由基頻決定。
基頻與諧波存在嚴格倍數關系，所有諧波頻率都是基頻的整數倍。這種特性在音樂聲學中尤為顯著，例如小提琴弦振動時會産生基頻為440Hz的正弦波，同時伴隨880Hz、1320Hz等諧波成分。
在工程應用中，基頻檢測是語音信號處理的關鍵技術。通過快速傅裡葉變換（FFT）分析語音信號的頻譜，可以準确提取說話人的基頻參數，該參數被廣泛應用于語音識别、語音合成和生物特征認證系統。美國國家标準技術研究院（NIST）的語音質量評估标準中，基頻穩定性是衡量合成語音自然度的重要指标。
參考資料：
"Fundamental frequency"（基頻）是物理學、聲學和信號處理中的重要概念，指周期性波形中最低頻率的振動成分。以下是詳細解釋：
基頻是周期性信號（如聲波、電磁波）重複一次所需時間的倒數。數學上可表示為： $$ f_0 = frac{1}{T} $$ 其中 ( T ) 為周期（單位為秒），( f_0 ) 為基頻（單位為赫茲，Hz）。它是複雜波形分解後最基礎的頻率分量。
基頻決定了聲音的感知音高，而其他頻率成分稱為諧波（基頻的整數倍）。例如：
常用技術包括：
若信號無周期性（如噪聲），則不存在基頻。此外，某些樂器（如鐘、鼓）因振動模式複雜，基頻可能不顯著。
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