Questions tagged [tone-generation]

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6 votes
2 answers
431 views

What causes the mismatch between a calculated sine wave and a measured sine wave?

Note: this question has been edited to refer to a sample that does not use dithering. I recently asked my first question on here, about what I saw in an uncompressed audio file written out as integers....
Patrick O'Brien's user avatar
4 votes
1 answer
2k views

Smoothed Square Wave

new here and probably pretty unexperienced compared to the rest of you. This should be simple enough but just wanted some clarification. I'm trying to model an analog square wave oscillator with C. ...
yun's user avatar
  • 209
3 votes
4 answers
864 views

Amplitude of the fft is less than what is expected

This is my MATLAB code ...
SeAlGhz's user avatar
  • 91
3 votes
1 answer
187 views

Sampling pure tone sine waves [closed]

What would happen if I am using the maximum frequency as the sample rate for sampling a pure tone sine wave? For example, a $10\ \rm kHz$ sampling frequency for a $10\ \rm kHz$ monotone sine wave. ...
Mark Steven's user avatar
3 votes
3 answers
684 views

Constructing a tone through additive synthesis

This question follows from: Synthesizing harmonic tones with Karplus Strong I am attempting to generate a full soundbank of 88 notes. As far as I can see my three options are: Using samples Using ...
P i's user avatar
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1 vote
2 answers
3k views

Understanding sine wave generation in Python with linspace

I was trying to sample a 12.8 MHz sine wave (78.125 ns) signal at every 160us (micro seconds). Since 160us is multiple of base period 78.125ns(x2048) i expected to get a sample of fixed amplitude but ...
arun's user avatar
  • 17
1 vote
3 answers
864 views

Synthesizing harmonic tones with Karplus Strong

I'm building my own MIDI synth. I have to create a decent sounding tone for every note on the piano keyboard (A-1 through C7, or MIDI 21 through 21+88=109) I've been using a basic ring resonator, ...
P i's user avatar
  • 1,319
1 vote
2 answers
292 views

Generating a high SNR sinusoide with lut on a DSP

I'm generating a sinus by using a lut method on a DSPic33f. My sample rate is 48 kHz, so I saved 12000 of the first value (unsigned int, 16 bits) and use trigonometric formulas to calculate the other ...
Nessy W.'s user avatar
1 vote
1 answer
190 views

Best window before FFT ? (for a signal consisting of 2 tones used for phase measurement)

I am doing phase measurments by transmitting and receiving tones (100 kHz and 16 kHz simultaneously). I am transmitting the tones and receiving them, applying Blackman Harris window and doing FFT for ...
Kurtul's user avatar
  • 135
1 vote
1 answer
384 views

Bandlimited PWM

Trying to figure out how to synthesize a Bandlimited PWM in my audio code in C. I have already figured out a bandlimited pulse wave but I can't really figure out how to translate that to PWM. I have ...
yun's user avatar
  • 209
1 vote
1 answer
216 views

reducing MIPS in detecting tones

Currently our software is detecting tones using FFT and checking if there is only a single peak in frequency spectrum. Our software needs to know what kind of input it is before taking action. So we ...
noman pouigt's user avatar
1 vote
0 answers
42 views

Different kinds of beeps and tones

I have heard many different types of beeps, chimes, and other tones. Audacity allows me to generate simple waveforms like sine waves and square waves, as well as DTMF tones. But I want to generate ...
Patrick O'Brien's user avatar
1 vote
1 answer
5k views

How to perform sine generation (in C)?

I am interested in how should a listing for a program look like that will generate a sine of f=50hz, using the next arguments for any moment in time. ...
mypaul's user avatar
  • 13
0 votes
1 answer
1k views

How to detect and remove ringback-tone and ivrs voice etc from the beginning of an audio call recording

In an audio recording (say a telephone conv. b/w two people), how would I programatically detect and remove the dial-tone at the beginning of a call using python. Ex : As you can see the first 15 ...
kRazzy R's user avatar
0 votes
2 answers
14k views

How sine wave is generated using lookup tables

From this document I am quoting P2,L7 So what is the incremental distance if we are using a 64 element look-up table instead of a sine function based on 2π? incremental distance = 2k*64/48k = 8/3. ...
nmxprime's user avatar
  • 207
0 votes
1 answer
97 views

FM generation with complex numbers

Background To generate a sine wave the straight forward way is to call the sin method for each data point: Iteration (pseudo code): ...
Jay Anderson's user avatar
0 votes
3 answers
5k views

Matlab HIgh frequency sine wave generation

I need to generated a high frequency sinusoidal signal for modulation in MATLAB. But it turns out to be something weird. This is the simple code snippet I used... ...
qzyDO's user avatar
  • 3
0 votes
1 answer
68 views

How do I use the Lazzarini-Timoney DSVF as a sine generator?

I've tested out the Chamberlin digital state variable filter (DSVF) as a sine generator as per this well-known approach. At $f_0=686\text{Hz}$ tone and $f_s=48000\text{Hz}$ it sounds fine and the FFT ...
John Moser's user avatar
0 votes
1 answer
272 views

Convert A frequency weight to Z frequency weight

I want to get the SPL of a monotonic sound like a 1khz tone but the problem is that I have a SPL meter which gives data in terms of A frequency weight. Is it possible to get the SPL of a 1khz signal, ...
SeAlGhz's user avatar
  • 91
0 votes
1 answer
157 views

Karplus-Strong with Jaffe-Smith sample rate-independent

I tried to implement the Karplus-Strong algorithm with some of the Jaffe-Smith extensions (improve pitch, dynamics, etc). Here is the code. When I run it with a sampleRate of 48000Hz, I get very ...
fserb's user avatar
  • 101
0 votes
2 answers
59 views

How to account for phase and shift when composing a new signal based upon 2 or more recordings?

I have 2 signals that were independently recorded, and want to produce a new signal that would represent what would be recorded if both signal sources were emitting at the same time together. ...
Vass's user avatar
  • 125
0 votes
1 answer
132 views

Irregularities in tone generated using FFT data

I am implementing a simple program to generate tone in MATLAB using FFT/iFFT by zeroing all frequency bins except for the one frequency that I'd like to generate a tone in. Sampling frequency is ...
whoknowsmerida's user avatar
0 votes
1 answer
80 views

THD requirement for generated sine

I need to generate a sine signal using a DAC with a certain THD specification, say 0.1% @ 1KHz. As a first approach I’m considering it to be an ideal DAC along with an ideal LPF for aliasing removal ...
PDuarte's user avatar
  • 121
0 votes
1 answer
987 views

PortAudio: how to generate multiple sounds

I have simple wave generator in PortAudio. I'm creating single sine wave, and then I use a lookup sine to play it. Now I've stucked here. I have no idea how I can add another sine sound. Is it ...
Lizard_Paszczyk's user avatar
0 votes
1 answer
711 views

Generating drum sample in programming language [closed]

How would you generate the sample of a drum, say "tom". Using the programming language and it's functions like addition, multiplication, sine, sqrt etc. I tried to generate the sine wave and then ...
exebook's user avatar
  • 111
0 votes
1 answer
2k views

Tone generation in Matlab (scientific paper)

I'm trying to generate sounds as described in a scientific paper that I found on the Internet. What I need to do is to generate simple tones in a certain pattern, however I have some issues ...
gothbit's user avatar
0 votes
0 answers
109 views

Sound of (sea) waves imitation

I need to create an algorithm for sound of waves. So I imagine it should be a white noise with doppler effect. However I understand doppler is just change of frequency. But white noise have all the ...
Boppity Bop's user avatar
0 votes
0 answers
346 views

Direct Digital Frequency Synthesis, NCO and negative frequencies

I need to translate a frequency band generated by a DDFS designed in a FPGA (using Xilinx DDS Compiler). My output to the NCO is in I/Q format. I chose to use a NCO to perform the frequency shift but ...
AtoM_84's user avatar
  • 21
0 votes
1 answer
1k views

DTMF Tone Generation in MATLAB not sounding right

I'm starting out with some DTMF Tone Generation using Matlab and I wanted to find some theory behind how to generate the various tones for a 4x3 keypad consisting of 0-9, * and #. So far I have the ...
ragzputin's user avatar