| 1. | Frequency intermodulation of records ; measuring methods
唱片的差频交叉调制.测量方法 |
| 2. | Beat frequency electrotherapy unit
差频电疗机 |
| 3. | Audio interpolation oscillator
音频差频振荡器 |
| 4. | Difference frequency distortion
差频失真 |
| 5. | Bfo beat frequency oscillator
差频振荡器 |
| 6. | Beat frequency oscillator
差频振荡器 |
| 7. | Beat frequency indication
差频指示 |
| 8. | Photographic sound record ; difference frequency method for measurement of non - linear distortions
摄影录音.测量非线性失真的差频法 |
| 9. | Hybrid integrated circuits . detail specification for type hchf01 frequency differencing and channel seperation
混合集成电路. hchf01型差频和上下分离电路详细规范 |
| 10. | Still the spectrogram , in which there was exactly equal value between every frequency component , manifested the property of periodical oscillation
频率谱中各谐频之间具有严格相等的差频，表现出周期性振荡的特性。 |
