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2009.05.23

15.75kHz

NTSC/480iは正確には15.73426kHzでいいんだったっけな?

TV番組の良いライブ演奏の音声なんかを
アナログ放送>HDDレコーダ>DVD-R>PCでリッピングして
iTunesに突っ込んで、「個人で楽しむ」なんてことしてるんですが。
#個人で楽しむので著作権法上はクリアよん。

取り込んだ音声をスペアナで見ながら編集してると
結構盛大に水平同期周波数の15.75kHzが乗ってくる。
テレビ点けてると聞こえるいわゆる空電音の「ツーン」ってやつ。

特にアナログ放送ですから、音声はFMラジオみたいなもんだし。
地デジだったら乗らないのかもしらんが(やってないのでわかんない)。

コレ入ってると、どうも「テレビっぽい音」に感じちゃうんですよね。
レベルはそんなに高くない-60dB程度なんですが、
曲間とか切れ目に-40dBまで落ちると、聞こえちゃう。

ノイズとして"聞こえる"というより、
電源入ってる、機器で再生してる、ライン来てる、とか
空気感が付いちゃう感じだけどね。

垂直周波数の60Hzもうっすら見えるのですが、
うまいことフィルタで切れているようで
これはどーんとサブウーファのボリュームでも上げない限り
そんなに気にならず。

ってなことを波形を見たり、フィルタの設定を上げ下げしたり、
周波数を変えたファイルを再生しながら試していると・・・・。

----------

・・・・「さっきからキーンって音がするんだけど(困)」
と言って、ムスメが来た。

あー。おーおーおー!
さっき再生したファイルの音が聞こえちゃったか。

・・・ココで思い出した。
モスキート音って流行ってるじゃないですか。

若者にしか聞こえない着信音とか、撃退(不快)音とかといって。
17kHzを使うらしいんだけど、ホントに効果あるのかな・・?

と思って、面白いのでカミサンも呼んできて、
試しに、周波数を変えていろいろ実験やってみた。

私とカミサンは16kHzまでは聞こえた。
18kHzはムスメは余裕で聞こえたらしいが
私とカミサンには聞こえなかった。

だからモスキート音の17kHzだったら
コドモにはホントに余裕で聞こえているんだね、実感。

----------

15.75kHzっていうテレビっぽい音は
オトナでもかろうじてわかるギリギリに乗っかってるので
わかっちゃうもんだったのね。

ちなみに、私でも聞こえた16kHzは
一般に30歳以上ではキビシくなるらしいのですが
ワシら耳はオトナでないのかw、
カミサンも含め、○○ガキ並みなのか。

家電機器とか通信機器とか電源入れっぱなしだと
「どーも調子悪い」とか言ってくるのを見てると、
こういう機器の出す音って、
けっこう聞こえてるんだろうな、実は。

|

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Comments

あぁ、私にはもう聞こえないでやんす>モスキート音

だがしかし、相方には聞こえるんだな。
蚊並なのか。(違)>相方

Posted by: irikura | 2009.05.23 at 10:00 PM

どもども。

>irikuraさん、
女性のほうが聞こえる(敏感)かもしれないですよ、特に環境音に関しては。ひょっとしてウチのカミサンも犬笛が聞こえたりして(^^;;

私はハタチくらいで20kHzが聞こえましたが、
年々着々と落ちてきているようです。

High落ちするのを、単に"老化"と見るか、
年齢なりに"ノイズリダクション"が成長したと見るか、
はたまた、まだまだ鍛えれば保てるものなのか、
興味のあるところです。

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