1) frequency-modulated audio tone
调频音调
3) pitch frequency
音调频率
4) modulating audio frequency
调制音频
5) multi-audio frequency modulation jamming
多音频调频
1.
On the basis of Link-11A communication signals,three jamming modes used for tracking and aiming: noise frequency modulation jamming,multi-audio frequency modulation jamming and FSK jamming on π/4-DQPSK signals were studied.
基于四相差分相移键控(π/4-DQPSK)的调制方式在数据链通信中占有十分重要的地位,从分析π/4-DQPSK基带与频带信号特征出发,以Link-11A数据链通信信号为基础,研究了用于跟踪瞄准式干扰的3种干扰样式:噪声调频、多音频调频、频移键控对π/4-DQPSK信号的干扰。
6) frequency-modulation and voice frequency
调频与音频
补充资料：调频
载波的瞬时频率按调制信号的变化而变，但振幅不变的调制方式。载波经调频后成为调频波。用调频波传送信号可避免幅度干扰的影响而提高通信质量。广泛应用在通信、调频立体声广播和电视中。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条