Audio Engineering

A Brief on Signal Generator (2)

The Music Telegraph | Text 2023/05/09 [12:23]
Audio Engineering

A Brief on Signal Generator (2)

The Music Telegraph| 입력 : 2023/05/09 [12:23]

 

▲ Leader Instruments' LSG-15 signal generator

© Wikimedia Commons

 

 

A Brief on Signal Generator (2)

 

You will be using a signal generator (a.k.a. sine wave generator) in many different applications in professional audio and music creation. It is therefore important to know how the output level of the generator alters with changing frequencies. After all, if the generator has an output level at one frequency that is different than other frequencies, then it becomes more of a headache to use. You would have to readjust the output level for every frequency you chose. This makes it difficult to do if you are constantly changing the frequencies. It would be better if we had a generator that had the same/constant output level independent of the frequency selected. In the audio world, this characteristics is called a "flat" frequency response — because a graph of the frequencies and output levels would be a flat horizontal line. A flat response curve is good in audio. It allows us to set a level and not have to worry about it when we make changes to other variables.

 

 

*In the following operation, you will check the frequency response characteristics of the signal generator with the ACVM.

 

(Step 1) Set the signal generator to 500 Hz.

(Step 2) Adjust the signal generator output level to 0 dBv.

(Step 3) Note the reading from the ACVM and record it in the chart below titled "Generator Frequency Response Table" under the 500 Hz column.

(Step 4) Repeat the voltage readings taken in Step 3 for each of the other frequencies listed on the chart, and record them in their appropriate columns.

 

<Generator Frequency Response Table>

Frequency 100 Hz 500 Hz 1 kHz 10 kHz 20 kHz 50 kHz  
ACVM  0 0 0 0 0 0 dB

 

(Step 5) Based on data from the Generator Frequency Response Table, how would you describe the frequency response of the signal generator? 

Example answer: dB values are same over all listed frequency ranges — flat frequency response.

 

 

 

 

 

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