What are the three sound indicators to be selected for the recording of the sound

1. The digitization of sound consists of three steps: sampling, quantification, and encoding.

2. The three main indicators in the digitization of sound signals are: sampling frequency, number of quantization bits, and number of channels.

The two main measures of sound are "frequency response" and "signal-to-noise ratio". The high, mid, and low tones of the sound are all different frequencies in the audio, and only various frequencies, such as the sound of the drum (low frequency) and the very sharp scream (high frequency), can be well reflected and played, that is, the "fidelity" is usually good, that is, the frequency response is good. The signal-to-noise ratio is the ratio of the sound signal to the noise (noise), of course, the larger the signal-to-noise ratio, the better.

bits and levels.

The concept of level is also very important,That is, the size of the sound,I don't know if you have such an experience,When watching TV, suddenly the sound of this station is louder,The other is smaller,This is because the sound level is not right These are also the mistakes of the provincial station that are often easy to fan,The sound is not leveled when the final output is made,But like Beijing TV1 2 3 for technical review,The remaining stations do not need technical review,That's why it will be like this,Strictly speaking,The final output should be technical review of the level of the picture and sound The level is an important mark at this time.

The volume of the cassette recorder is determined by a number of factors:

1.the size of the level when recording;

2.the quality of the cassette and the size of the output level;

3.the size of the sound detection ability of the head of the tape recorder;

4.the size of the equalization amplification capacity of the head amplifier;

5.the undistorted power of the power amplifier circuit;

6.The matching rate of the impedance and power of the speaker and the amplifier, the above 6 points determine the sound of the recorder!

When buying a cassette recorder, you must focus on several indicators:

1.Undistorted power:

The household cassette recorder should have a non-distortion power of about 2 times 50 watts;

It should not be less than 2 by 2 watts!

Instantaneous power is a false indicator, don't believe it easily!

Instead, the indicators that should be grasped are:

5-20kHz2-10 undistorted power!

2.Speaker indicators:

Because it is impossible for the buyer to choose another speaker for the same type of machine, so be sure to pay attention to a few points:

First, the speaker should be real and heavy;

2. Turn the sound on to the highest or off to the lowest, and the sound should not have a sense of blockage and cracking!

3. No communication sound is allowed when the maximum and minimum sound is reached!

Fourth, the sound field positioning should be good, and there is a real three-dimensional feeling!

The soundstage should not be out of place, such as the sound of a violin in the front left.

Can't go to the right or can't get your bearings!

Right-to-left moving tones do not allow for misalignment!

7.Brand! 8.**！

9.Appearance! - Lonely mountain man.

By standard: amplifier blocks! And is an integrated block! Generally speaking, the larger the wattage, the larger the amplifier block, so buy a radio with a large wattage @!

The magnitude of the sound is determined by the amplitude of the sound wave. And the sound volume in the cassette recorder is determined by whether the amplifier of the cassette recorder is good or not. If the amplifier is good, small signals can be amplified, and large sounds can be heard without distortion. Of course, the impedance of the speaker should also match the power amplifier.