sigmastudio

Hello javaboy,

Do you want to increase the gain of signal?

There are volume control blocks, gain blocks available in sigma studio. You can use that to increase the signal level.

You can see the volume control blocks at the bottom of the tree tool and gain blocks can be found in Basic DSP >> Adjustable gain.

However, 0dB is the full scale value.

Regards,

Harish

Yes, I want to amplify the signal. Is this volume control module used to reduce the volume? Why are the scales negative.

Yes, I want to amplify the signal. Is this volume control module used to reduce the volume? Why are the scales negative.

Yes, I want to amplify the signal. Is this volume control module used to reduce the volume? Why are the scales negative.

Hello javaboy,

In the DSP, 0dB is the maximum audio level that you can represent. The highest audio level you can represent is 0dB, usually called as 0dBFS. that is a decimal value of 1.0 in 8.24 number format. So, you can only reduce the signal level from the full scale of 0dB. That is why you see those negative numbers.

Just consider your input audio level is 0dB (the highest audio level. which is 1.0 in 8.24 format)

when you pass thru the signal to a volume control which is set for -3dB then your original input signal is multiplied with apprx 0.707. so, there will be a volume reduction.

when the volume block is set for -6dB, your original signal is multiplied with 0.5. So, your original input is reduced to half the level.

So, dB is in log scale. Bob and Dave had put a great post about dB conversion here. please go through it.

Also please refer the number formats of the DSP system here.

Regards,

Harish

Thank you for your answer. You are really professional.