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| 来源： | Freesound 前往原页面 查看译文 |
| 作者： | sumsa |
| 许可： | CC-BY 保留署名许可协议 |
| 描述： | An old school computer just chatting along, or a SciFi data transmission? Actually this is a Low Frequency (LF)/ Very low frequency (VLF) radio recording. As it turns out you can make your own VLF radio from your sound card, and it can record frequencies up to 22 KHz using 44,1KHz sampling. Apart from being able to listen to lightning strikes, and ionospheric phenomenon you can also listen to the data communications to nuclear submarines. To record this I used a sample rate of 196KHz (gives a frequency band of 98 KHz), and a loop of insulated wire coupled to my sound card. The data transmission was at 60KHz which is above the audible range. To make it audible I pitch shifted the audio 3 octaves using a FFT pitch shifter. You can hear the data transmission coming on, at 4 min a BEEP is clearly audible, at 12 min the data transmission is over and other faint transmissions might lurk in the static. If you are interested in making your ovn VLF recordings you can visit: http://en.wikibooks.org/wiki/Electronics/VLFreception_with_the_PC |
| 标签： | scifi submarine transmission data 60s radio computer lf vlf |
| 音频格式 | flac |
| 声音时长 | 15:32 |
| 文件大小 | 35.9 MB |
| 比特率 | 322 kbps |
| 采样率 | 44100 Hz |
| 位深度 | 16 bit |
| 声道 | 立体声 |