Do though it is good to have opened the calibration sound source that correctly restricts the level of the sound to the public?How it uses it is not understood.
It is thought that it wants you to study somewhat voluntarily when the broadcasting electric wave is output.

Please recognize the thing that is absolutely the condition of BROADCAST again to the thing sent at a standard level of a correct sound.

with an important thing sent at a standard level of a correct sound before it says of commenting on tone quality is described in detail
on the page of the voice level calibration sound source.

Does your station know width and the quality of the electric wave to the sound that have emitted ?
 

  The maximum value of sound in frequency modulation broadcasting
 
The maximum values of the sound (100% modulation) in the frequency modulation broadcasting of Japan are several 150KHz Frequency Deviation The electric wave of FM makes the sending frequency change up and down according to "FM=Frequency Modulation = frequency modulation" voice signal as its name suggests and transmits the voice. "It is best and paddle sound" will have gone out at this time by the translation that the range to make the frequency of the sent electric wave change says 150KHz (100% modulation) in the maximum.
 

Because the reception side (FM tuner etc.) is made from this standard In addition, because the range of the electric wave is exceeded even if it is thought that "Paddle sound" is output, the sound is distorted. It is necessary to maintain the range called several 150KHz Frequency Deviation in this maximum value with to broadcast because of a good sound.

Therefore, it is necessary to observe several Frequency Deviation of the electric wave to manage the sound in the frequency modulation broadcasting correctly. An expensive device is necessary to see Deviation of the electric wave.

It is a thing said that it is width of the electric wave to the end that says several 150KHz Frequency Deviation=(100% modulation) this, exists, and there not listening in the thing of the size of the sound that is from FM tuner. Deviation exceeds 150KHz before reaching the volume that the commercial broadcast bureau has output because the quality of the electric wave is bad and wide for the stereo transmitter for mini FM. It is necessary to note it because it turns up the volume forcibly and sound not only is distorted but also the band extends and the trouble is caused to the adjacent channel.

It is necessary to know the level of the sent sound correctly however to listen to broadcasting in there are various problems like the above-mentioned to manage the sound in the frequency modulation broadcasting correctly. Because it doesn't become a talk in not understanding the level of the sent sound ¥¥¥ It makes it this time though it doesn't become a watch of the sending level that the frequency modulation broadcasting is correct in an original meaning as explained with the above sentence to seeing the emitted sound.
The peak meter with high accuracy is necessary for the voice output of FM tuner to see the peak value of the sound accurately though some sound can be observed if the level meter is seen putting it. A genuine highly accurate peak meter is very expensive.
 
 
Because using the oscilloscope in the XY mode becomes it is far easily from an expensive peak meter, it often sees on the site in the studio etc. of broadcasting and the recording. The oscilloscope of high accuracy so much is useful enough because it is unnecessary in case of being by the thing of about 5? 60,000 yen. see only the peak value of the sound
 

The mini FM station of connected the oscilloscope with FM tuner and had used it to observe the voice level because it was cheaper to use the peak level meter with high accuracy when mini FM was done in a certain place and it existed in old times. At that time, a handy oscilloscope in the Middle Ages can obtain for the watch of the voice level by about 1-20,000 yen, it do, and accuracy at the sending level rises greatly by using the oscilloscope.

About 1-20,000 yen?¤I am melting ? it is possible to output actually only to see the level of the sound though seem to be said such money when having no money when I have received the consultation of the mini FM station. It is possible to output is said so much

However, it is necessary to spend money in a necessary place to output the electric
wave because of a good sound. Money is spent in a strange place for a lot of mini FM station in a necessary place though it is important. !!..(.. Wara
 

For the no Money mini-FM station that sees this page.

Money doesn't allow it to say no squid occurrence. This page is seen and the thing is with personal computers. The voice level that a personal computer and free software are used and accuracy is high is observed.

If it is a moderate thing of the WaveSpectra personal computer, the software used is OK. I use it because it is only a watch of the sound this time though I want to introduce on another page next time because WaveSpectra is convenient software in color respect mode only XY it... "Refer to the manual of software for a detailed usage. "

it thinks an efficient limited FM tuner title to be possession because the broadcasting electric wave of FM has been output and connect as follows, receive a temporarily existing broadcasting, and adjust the meter. Monitor, look at broadcasting color until the movement of the screen and the relation of the sound can be understood, and the person who says that it will use it for the first time thinks that the thing of color is understood when keeping seeing though he or she thinks that it immediately becomes actual combat use if there is having used the oscilloscope in the XY mode in the past.

Correct accuracy is not obtained with an external antenna excellently in there is no multipass if it is receiving it when an existing broadcasting is received.
 

Here, a very important thing is not in seeing the level of the emitted sound, and is a thing to receive the transmitted electric wave and to see the voice level.

When you see the stereo voice of the output of FM tuner in the XY mode of WaveSpectra.

It is important to receive an existing broadcasting and to monitor the state of the sound, looks, and I think that the color thing is understood when keeping seeing.

There is surprising information in this screen, and information on the sound a right and left signal level, a right and left balance, the phase, and distortion.. The thing got used to seeing is the first one step even in the electric wave trouble by the multipass etc. according to the thing that the signal is distorted.
 

Though it is thought that it is possible to understand naturally of the level setting etc. of the screen if an existing broadcasting is received and the state of the sound is got used to seeing.... Because signals of 1000Hz that NHK has for your information sent before the start of the broadcasting are several 100KHz Frequency Deviation it is possible to use it for the level proofreading of the screen. !!
 

Well, please decide the maximum volume that the bureau puts out in the place where movement was understood referring to the size of the sound of an existing broadcasting. Deviation of the electric wave .... surely exceeds it for the transmitter for mini FM before it says the volume that the commercial broadcast has output as explained with the above sentence because there is a possibility to exceed 150KHz before it reaches. You will output [Width of electric wave that mini FM station has output] (special volume addendum 1) to reference 4-8dB low level.     Audio signal of L+R

 
 

Audio signal of L-ch

Audio signal of R-ch

 

limiter point will be ascertained and we recommend the adjusted thing if breaking out because it has the comp limiter. It is ..frequency modulation broadcasting.. correct, limiter doesn't operate, and, however, it is because it doesn't control the emphasis in FM because then, there is no usual comp limiter however for FM Broadcast though it becomes only a mere consolation level to the last.

For what it is not useful if not adjusted to limiter point comp limiter taking correct.
 

The management of the modulation (sound) in an original frequency modulation broadcasting should see several Frequency Deviation and it is not in the size of the sound and decides the modulation level to the last by the width of the electric wave. Do though it doesn't understand whether you had managed the sound like any up to now?Mashi far though it doesn't go to the management of a real modulation (sound). do not observe it
 
 

Actual use example.

The thing of the image below is possible recently though sending the sound from PC generally becomes by putting the output signal from the tuner in the line input of PC while the sound is emitted.
 

 
 
 
 
 

A little advanced usage

A little advanced usage USB audio interface is seen in sending the sound and because the sound system of PC becomes two systems in case of being because it handles both shapes of waves that receive transmission �¨ through processors of the sound and the comp, etc. before it puts it on the electric wave can be seen at the same time.
 

When the color of the screen is changed by transmission to reception, is it comprehensible ?
 
When stuffing by force to see such feeling and using it Capture actually, the window is greatly taken because the screen is large.
 

 
 
 
The question to a technical station. with the following mail.