开路谐振
对于压电系统，指一种机械谐振，其频率 /( f_{oc} /) 对应于压电陶瓷处于开路状态（未相互连接）时的条件。（见 Hirose[1]，第 213 页。）压电系统可以仅由压电陶瓷组成，也可以由压电换能器组成，或由压电换能器加连接的谐振器组成。
开路谐振的特征是高阻抗（即低导纳），因此在给定驱动电压下产生的振幅相对较低。
开路谐振总是伴随着一个频率稍低的短路谐振。见短路谐振与开路谐振的比较。
这种谐振状态通常称为"并联谐振"。然而，这一术语背后的含义需要理解压电陶瓷的等效电路，而"开路谐振"的概念在物理上更直观，因此是首选术语。
历史上这种谐振状态曾被称为"反谐振"。然而，由于"反谐振"实际上也是一种谐振状态，"反谐振"是一个自相矛盾的术语，应当避免使用。
Open circuit resonance
For a piezoelectric system, a mechanical resonance whose frequency /( f_{oc} /) corresponds to a condition where the piezoelectric ceramics are open circuited (not connected together). (See Hirose[1], p. 213.) The piezoelectric system may consist of piezoceramic(s) alone, piezoelectric transducer(s), or piezoelectric transducer(s) plus attached resonators.
Open circuit resonance is characterized by high impedance (i.e., low admittance) which yields relatively low amplitude for a given drive voltage.
An open circuit resonance is always accompanied by a somewhat lower short circuit resonance. See Comparison of short circuit resonance and open circuit resonance.
This resonance condition is often called "parallel resonance". However, the meaning behind this terminology requires an understanding of the piezoceramic's equivalent circuit whereas the concept of "open circuit resonance" is physically intuitive and is therefore preferred.
Historically this resonance condition has been called "antiresonance". However, since "antiresonance" is an actual resonance condition, "antiresonance" is an oxymoron which should be avoided.