Hi-Fi is the abbreviation of English High-Fidelity, which is translated as "high fidelity". Its definition is: a playback sound that is highly similar to the original sound. It has different sound quality from CD.

CD-level D sound quality refers to 16-bit depth and 44.1KHz sampling rate. Most music, including lossy and lossless music, uses the same sampling rate as CDs and should choose this level.

There were some netizens asking,

What is sound quality?

emmmmm, how to describe it?

This is something that everyone has different opinions on.

I don’t know if you still remember

"Water or thermal power" is a more fantasy joke.

Because sound quality is a relatively subjective thing,

So let’s call it metaphysics (no).

What I want to talk next,

It is the CD sound quality and HiFi sound quality that everyone often sees.

First, let’s take a look at the HiFi sound quality.

Many friends often see certain headphones

The advertising slogan is HiFi sound quality,

Then I saw more and listened more,

I gradually began to believe that HiFi sound quality is good sound quality.

But now Mai Mai is going to cruelly break this thought of yours,

HiFi is actually a subjective and vague concept.

It means high fidelity and high resolution,

To put it bluntly, the sound quality is good.

But there are no specific concepts and standards.

That is to say, every home can say that it has HiFi sound quality.

Just like the "Wang Po selling melons" all over the street,

I think the sound quality in my home is good, that is, HiFi sound quality.

So some merchants say what kind of headphones they have,

What radio has HiFi sound quality?

Maybe he's also a bit of a scoundrel.

Anyway, there is no specific criterion for judging.

Ordinary consumers can't tell whether a professional is good or bad.

As for the term high fidelity,

Those who say that the sound quality can hear tiny details is good sound quality,

In fact, Mai Mai disagrees.

To put it simply, it’s like you farted while recording a song.

You can't hear it with ordinary headphones.

And the speakers that tout high fidelity and high prices can be heard,

But I just want to ask,

Do you really want to hear beautiful singing?

I still want to hear the sound of this insignificant fart.

So Mai Mai thinks,

Good sound quality is achieved by properly losing some irrelevant noise.

So what is the concept of CD sound quality?

CD?

Give you a CD from the past,

Listen to our love at that time~

It’s a little crooked, let’s get back to the point,

Note that the CD that MaiMai said has CD sound quality is not this CD.

First, let’s give a textbook explanation.

The industry-recognized sound quality standards are divided into 4 levels.

Signal bandwidth is 200Hz-3400Hz,

That is, phone voice quality;

The signal bandwidth is 50Hz-7kHz,

That is AM broadcast quality;

The signal bandwidth is 20Hz-15kHz,

That is, FM radio quality;

Signal bandwidth is 10Hz-20kHz,

That is, digital laser disc CD-DA quality.

OK, it’s still very blurry when you look at it, right?

Simply put, the higher the frequency range value, the better the sound quality.

I don’t know when you download mp3,

Have you noticed this number group?

128kbps

320kbps

What is this? It's called code rate.

The higher the code rate, the smaller the compression ratio.

The smaller the sound quality loss, the closer the sound quality is to the sound source.

Just like video quality 360p/480p/720p,

Since CDs are said to have good sound quality,

So what is the bit rate of CD quality sound?

It’s like this. It’s generally not popular to talk about bit rate in our CDs.

Instead, it is represented by sampling rate,

Such as 16bit/44.1kHz.

can't read? In layman's terms,

That is kHz = sampling rate, bit = number of encoding bits.

The larger the sampling rate, the higher the quantization of the playable sound range;

The larger the number of encoding bits, the more delicate the sound that can be played.

If you insist on converting it into code rate, it is

44.1KHZ (sampling rate) x16 (number of encoding bits)

x2 (dual channel) =1411.2Kbps

CD wins, oh yeah!

OK, it took me a long time to explain.

This means that CD-level sound quality is something that can be quantified.

Rather than just saying that I have CD quality sound, I can just talk nonsense.

Just like our Smart Mai,

The CD-level sound quality we are talking about is supported by data.

You can't talk nonsense.