We have been making outdoor acoustical measurements with a sensitive,
low noise professional system. One of our measured (microphone) signal
contained strange music probably from an AM radio station. This strange,
short part in between the acoustic recording was found in data collected
during an aurora night. The only thing we are sure about is that this music
is NOT Finnish! ;)
The recording is quite noisy - barking dogs can also be
heard. The music was audible only 6-7 seconds in a recording of four
hours.
WAV-sample
(10s, 16-bit, 22050 Hz, 442 kbyte)
AIFF-sample
(10s, 16-bit, 22050 Hz, 442 kbyte)
Waveform and spectrogram of the music found in the noisy signal. Duration 10 seconds, frequency band: 0-11025 Hz.
ON THE MUSIC | ON THE MEASUREMENT SYSTEM |
M.A. (21.12.01):
The instrument is a small (?sopranino?) shawm[1]. The shawm is a double-reed instrument, and is the ancestor of the modern oboe. It is fairly common in the Middle East and parts of India, and the music sounds Middle-Eastern or, just possibly, Indian. It could be from Morocco, Tunisia, Libya, Saudi Arabia, Dubai, Qatar, Oman, Yemen, Syria, Jordan, Turkey, and so on. [1] That's the English name, anyway. It's called a "bombarde" in parts of France, and lots of other names in other countries. They come in all sizes. |
M.A. (21.12.01):
Could there be (or have been) a temporary bad connection in the microphone cable or somewhere else in the audio chain, such that incoming RF got rectified and the audio component was heard on your downstream equipment? What does your signal chain consist of, from microphone(s), through
mixing/preamplification, etc., to the recorder? Is your cabling balanced
(differential) 600 ohm throughout, or is part of it High-Z? The problem
is much more likely to be in any High-Z part of your signal chain than
anywhere else.
|
SHAWM (listen an example!)
(modified: 8.10.03 - opened: 21.12.01/ukl)