Sound generation with a particular power

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SHS 2019-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/485395-sound-generation-with-a-particular-power

评论： Walter Roberson 2019-10-17

How can I generate a sound with a particular power?

Using the sound function to play simple sinusoidal signals, the loudness does not change when I modify the power of the sinusoidal signal. For example, the following signals sound exactly the same:

signal_1 = sin(2*pi*1000*(0:0.01:1));

signal_2 = 10 * sin(2*pi*1000*(0:0.01:1));

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Answer 1

Walter Roberson 2019-10-15

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编辑：Walter Roberson 2019-10-15

help sound

sound(Y,FS) sends the signal in vector Y (with sample frequency FS) out to the speaker on platforms that support sound. Values in Y are assumed to be in the range -1.0 <= y <= 1.0. Values outside that range are clipped.

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SHS 2019-10-15

Thanks for the reply.

So, if I want to generate a sound with a higher power, do I have to connect an amplifier to the computer output? Or is there another MATLAB syntax to produce sounds with higher range?

Walter Roberson 2019-10-17

If the goal is to create an output at a given SPL (sound pressure level), you will need an external amp and calibrated settings, and some additional calculations. One thing you would have to decide is whether the SPL target is to be peak or RMS.

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