wave

I have to downsample a wav file from 44100Hz to 16000Hz without using any external python libraries, so preferably wave and/or audioop . I tried just changing the wav files framerate to 16000 by using setframerate function but that just slows down the entire recording. How can I just downsample the audio file to 16kHz and maintain the same length of the audio? Thank you very much in advance You can use Librosa's load() function, import librosa y, s = librosa.load('test.wav', sr=8000) # Downsample 44.1kHz to 8kHz The extra effort to install Librosa is probably worth the peace of mind. Pro-tip:

Which DSP library in C/C++ would you recommend? I will need it for real-time embedded systems. It'd be great to have sound signal processing accompany too, but not a mandatory. If you have knowledge of any DSP library, please kindly share. We are thinking of AVR, ARM and even some middle range chips Neither are particularly designed for DSP, but if your performance requirements are modest enough that may not be a problem. What do you need the DSP to do? I suggest that you choose your platform first and use the vendor's library since that will be optimised for the platform. If the vendor does

I assign a value to a variable x in the following way: import wave w = wave.open('/usr/share/sounds/ekiga/voicemail.wav', 'r') x = w.readframes(1) When I type x I get: '\x1e\x00' So x got a value. But what is that? Is it hexadecimal? type(x) and type(x[0]) tell me that x and x[0] a strings. Can anybody tell me how should I interpret this strings? Can I transform them into integer? The interactive interpreter echoes unprintable characters like that. The string contains two bytes, 0x1E and 0x00. You can convert it to an (WORD-size) integer with struct.unpack("<H", x) (little endian!). It's a two

I am using NAudio to play a sinewave of a given frequency as in the blog post Playback of Sine Wave in NAudio . I just want the sound to play() for x milliseconds and then stop. I tried a thread.sleep, but the sound stops straightaway. I tried a timer, but when the WaveOut is disposed there is a cross-thread exception. I tried this code, but when I call beep the program freezes. public class Beep { public Beep(int freq, int ms) { SineWaveProvider32 sineWaveProvider = new SineWaveProvider32(); sineWaveProvider.Amplitude = 0.25f; sineWaveProvider.Frequency = freq; NAudio.Wave.WaveOut waveOut =

I have about 80 compositions written in MIDI and I want to convert them in to WAVE using a sound library. So they can be played on all computers and sound the same. Is there a library that can automate this? Preferably in C#, but other programming languages are fine too. This is what's called a Soft Synth , you will also need a set of instrument samples if you want them the sound the same on all machines. You may find that you will save memory if you just convert them all to wave files once and ship the wave files. A high quality instrument set can be quite large, and most of them are

I'm trying to convert a WAV file(PCM,48kHz, 4-Channel, 16 bit) into mono-channel WAV files. I tried splittiing the WAV file into 4 byte-arrays like this answer and created a WaveMemoryStream like shown below but does not work. byte[] chan1ByteArray = new byte[channel1Buffer.Length]; Buffer.BlockCopy(channel1Buffer, 0, chan1ByteArray, 0, chan1ByteArray.Length); WaveMemoryStream chan1 = new WaveMemoryStream(chan1ByteArray, sampleRate, (ushort)bitsPerSample, 1); Am I missing something in creating the WAVE headers ? Or is there more to splitting a WAV into mono channel WAV files ? The basic idea