Tag: digital audio bluetooth transmitter

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Over the limits of human hearing! High resolution doesn’t make sense?

What is the limit of the ability to discriminate human sounds?

Although there are individual differences, the human audible range is said to be 20 Hz to 20 kHz.

The sampling frequency of the CD is 44.1 kHz.

In theory, this value can be reproduced up to 22.05 kHz of the original sound, so it can sufficiently cover the human audible range.

In that case, the question arises that high-resolution sound quality, which has higher specs than CDs, may not be audible to the human ear.

Actually, there are many negative opinions from a scientific point of view, and it remains controversial.

<Reference: High Resolution Audio-Wikipedia>

However, the sound is highly dependent on experience, so if you are interested, you should give it a try.

Necessary environment to enjoy high resolution
Whether it makes sense or not, there are a few things you need to prepare for to enjoy high resolution.

The required environment is as follows.

High resolution sound source
High-resolution compatible headphones / earphones / speakers
High resolution compatible terminal
Let’s explain each environment.

High resolution sound source
There are various media for high resolution audio sources.

The easiest of these is probably the Hi-Res Audio source that is delivered online.

If you are a high resolution distribution site, you can get many sources of sound.

Note that listening with high-resolution headphones will not result in high-resolution audio.

High-resolution compatible headphones / earphones / speakers
In addition to high-resolution audio sources, prepare items such as compatible headphones and earphones.

It is quick to check if there is a high resolution mark on the product package to see if it is compatible.

Please note that most wireless headphones do not support high resolution playback because they compress data during transmission.

In the case of wireless technology, only aptX / aptX HD compatible items or SONY LDAC compatible devices support high resolution.

In any case, the high-resolution branding is a milestone.

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High resolution doesn’t make sense?

Sound quality comparison!

What is the difference between bit, khz and kbps? High resolution doesn’t make sense?
It is quick to judge whether the sound quality is good or bad from the data.

However, there are several factors that make up sound quality.

Therefore, in this article, I explained the sound quality in a rather broken way.

If you are a little interested in sound quality, check it out.

High-resolution sound quality and CD comparison
Over the limits of human hearing! High resolution doesn’t make sense?

Necessary environment to enjoy high resolution
High resolution sound source
High-resolution compatible headphones / earphones / speakers
High resolution compatible terminal
High resolution recommended elements
ACTIVE “CT10”
Difference between analog data and digital data
Difference between lossless compression (lossless compression) and lossy compression (lossy compression)
Lossless compression (lossless compression)
Lossy compression (lossy compression)
About the uncompressed sound source
Difference between bit, kHz (kilohertz) and kbps (Kirobuki PS)
The next three units are important for measuring sound quality.

little
kHz (kilohertz)
kbps (Kilobit per second)
Let’s briefly explain each unit.

What is a bit?
bit is the number of quantization bits.

Here, it is easy to understand if you think of it as “the resolution (fineness) of the sound itself”.

The higher the value of this bit, the smaller and finer the sound can be reproduced.

In other words, it is more faithful to the original sound.

However, there is a disadvantage that the amount of data increases when the bit is large.

What is kHz (kilohertz)?
kHz is the sampling frequency.

It’s easy to understand if you think of it as “the number of data used in the expression of sound per second”.

The higher this number, the greater the range that can be recorded.

Also, kHz is one of the numbers often used to express headphone specifications.

If you look at the specification table, you will often see numbers like “20Hz to 20kHz”.

This indicates the range of supported ranges.

The lower the number on the left, the better the bass can be heard, and the higher the number on the right, the greater the playback range.

What is kbps?
kbps is the so-called bit rate.

Also known as “bits per second” or “kilobits per second”.

Unit that expresses how many kilobits of data can be transmitted per second.

Kbps can be calculated using the following formula.

kbps = bit x kHz x number of channels

The number of channels is the number of speakers, for example, in stereo, it is “2”.

In theory, the higher the number of processed bits per second, the higher the sound quality.

High-resolution sound quality and CD comparison
Let’s compare CD and high resolution sound quality from a data point of view.

little kHz kbps
16 bit CD 44.1-48 kHz 1,411.2 kbps
High resolution Exceeds 44.1 kHz / 16 bit
Those that exceed CD specifications are defined as high resolution.

Specific examples are as follows.

44.1 kHz / 16-bit: CD specifications
48 kHz / 16-bit: CD specifications
44.1 kHz / 24-bit: high resolution (the number of quantization bits is greater than the CD specification)
48 kHz / 24 bit: high resolution (the number of quantization bits is greater than the CD specification)
96 kHz / 16 bit: high resolution (sampling frequency is higher than CD specification)
96 kHz / 24-bit: high resolution (both higher than CD specs)
96 kHz / 12 bit: not high resolution (low number of quantization bits)
32 kHz / 24 bit: not high resolution (sample rate is low)