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INSPECTION
In the world of sound, most audio equipment in particular is basically designed to cover the 20Hz to 20KHz range.
However, human hearing changes and deteriorates with age. This is also a fact that no one can resist.
Here you can easily test your own hearing. What is your hearing range and how old are your ears?
Prepare your headphones or speakers and click on the "arrow" in the center of the image to start the video. Please be careful about the volume.
Volume ↑
What did you think.
In fact, as you know, your hearing range and the age of your high-frequency ears vary from person to person.
However, using ``Due to differences in the performance of headphones and speakers.'' You may or may not hear it.
When testing your hearing, you can get a more accurate reading by using headphones to block out extraneous surrounding sounds.
This headphone,closed headphonesandopen head headphonesThere are two types.
It is used depending on the purpose, butClosed type for monitoring detailed soundswins.
In my own testing, I tried the following four types of headphones:
SONY / MDR-CD900ST closed studio monitor headphones
SHURE / SRH840A-A Sealed Monitor Headphones
AKG / K553MKII closed headphones
NEUMANN / NDH 20 closed studio monitor headphones
There are individual differences, but for me personallyNEUMANN / NDH 20 It was confirmed that this was the easiest to hear and had the widest audible range.
Headphones also have the philosophy and individuality of the manufacturer. It is also true that many products color specific sound range frequencies.
What does an accurate monitor require?“Can you express the original sound faithfully and honestly?” That's probably what it means.
If it is not , the sound standards will become vague.
And most importantly, you need to choose headphones that match the usage situation.
Sound quality evaluation
(音質評価ソフト)
心理音響の評価を数値で表すことができます
製品から発生する音で、心地よい音、不快な音と感じるのは個人の主観で知覚されます。 人がどのように音を感じているかを数値化するための評価(心理音響評価)が必要となります。音質評価ソフトは、心理音響の評価を数値で表すことができます。
音質評価の表示例
定常音に対してラウドネス・シャープネスを演算します。

過渡ラウドネス・シャープネス
音圧レベルの変化がある音源に対し、ラウドネスを演算します。
ラウドネス・シャープネスの時間変化、瞬時値、ピーク値、時間率レベル(N5・N10・N5)の評価ができ ます。

ラフネス・変動強度(定常)
定常的な音源に対し、ラフネス・変動強度を演算します。

トーン性総合評価
Tone-to-Noise Ratio・Prominence Ratioの2種類が有ります。

アマチュア無線に適応させるために簡略最適化して評価を数値化できるようにしました。
< 状況設定 > 受信音声帯域 3KHz : 電波形式 LSB もしくは USB :
ある程度コンディションの良い状態で使用周波数の付近で大きな混信などを受けない状態で
ノイズに関してはブロワーなどの周辺機器ノイズを示す。
A.音の明瞭度 5=きわめてメリハリのある音質
4=メリハリを感じる音質
3=通常の音質
2=多少の明瞭度が落ちた音質
1=明瞭度が落ちている音質
B.高域の成分 5=きわめて高域が出すぎている状態
4=高域が強調されている状態
3=ほど良く高域が伸びている状態
2=高域が少し抑えられている状態
1=高域が全く感じられない状態
C.中域の成分 5=きわめて中域のみを感じる状態
4=中域が強調されている状態
3=ほど良く中域を感じることができる状態
2=中域が少し抑えられている状態
1=中域が全く感じられない状態
D.低域の成分 5=低域が強調されてすぎてメリハリが悪い状態
4=低域が強調されている状態
3=小気味よく低域を感じることができる状態
2=低域が抑えられた状態
1=低域が全く感じられない状態
E. S/N比 5=音声に対して周囲その他のノイズなどを全く感じない状態
4=多少のノイズは感じるが自然な感じで不快にならない状態
3=ノイズを感じるが通常の会話では我慢できる状態
2=ノイズの音が多少不快に感じる状態
1=音声に対してノイズが同等である状態
F.ひずみ成分 5=ひずみをまったく感じない音質
4=ごくまれにひずみを感じる音質
3=時々ひずみを感じる音質
2=明らかなひずみを感じる音質
1=連続して過大なひずみが認められる音質
G.送信帯域感 5=送信帯域にゆとりを感じる音質
4=送信帯域にある程度ゆとりを感じる音質
3=平均的な送信帯域音質
2=送信帯域が狭い感じがする音質
1=送信帯域が非常に狭い感じがする音質
Reverb Effect
リバーブは、音に残響音や反射音を加えることで、空間的な深みや広がり感を出すエフェクトです。 エコーとは違います。 使い方次第で上品で広がりをみせる音になります。
下の動画は、環境が違うとはいえ同じ歌手の声で違いを感じることができます。
ライブ原音
リバーブなどの調整を加えたレコーディング音声
DO YOU REALLY WANT TO HURT ME_ - Karen Souza
Trouble collection
About audio troubles
Voice wrapping phenomenon
During a conversation, if the other person points it out to you, or monitor it yourself.
Understandable situation. A condition in which the sound is distorted or distorted.
★When directly matching the radio to an unmatched antenna, or when using an auto tuner or analog tuner to tune an antenna with a poor SWR value.
★When wiring associated with wireless equipment is installed near a stabilized power source.
★When the grounding in the wiring from the microphone to the wireless device is incomplete due to poor contact, etc.
★When the microphone input limit of the radio is exceeded.
★When your mouth is close to the microphone.
About the hum sound
★When the microphone cord is passing near the stabilized power supply.
★When the microphone cord is not properly grounded.
★When various wiring is complicated.
About noise
Various noises
Regarding artificial noise other than natural noise.
★Power lines that are parallel to or close to the antenna.
★ Sources such as indoor LED lighting.
★Cordless phone and smartphone charger noise.
★Ripple noise from switching type stabilized power supply.
★Solar power inverter noise.
Audio connector & cable precautions
The difference between "BALANCED" and "UNBALANCED" is that the cable structure is different, and "BALANCED" has less noise and stable transmission compared to "UNBALANCED".
It's fine to connect the microphone that came with the radio to the mic connector on your rig, but when connecting audio equipment, use "balanced" cables and the connectors that come with them whenever possible.
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