Console and multithreaded recording and playback(www.alvas.net)

submitted by alvasnet(550) 6 months, 19 days ago

How to use RecorderEx and PlayerEx in console application or Windows Service? In order to use RecorderEx and PlayerEx in a console application or Windows Service need to create instances of these classes by using a parameterized constructor: new RecorderEx(true) and new PlayerEx(true), respectively. The same is true for multi-threaded recorder and player. Below is an example of full duplex Recorder and Player... read more...

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Vox audio file format(alvas.net)

submitted by alvasnet(550) 6 months, 26 days ago

Question: I found that your vox converter doesn't handle vox files from the Orator phone dictation system right. Answer: There are so many questions about Vox format. What is the Vox format? Vox audio file format is a headerless audio format data, which generally contains Dialogic_ADPCM, but may also include A-law, Mu-law, PCM, and any other type of audio data. It means that vox file doesn't have the header and extention ".vox" doesn't say anything at all. Therefore it is very important to know in which format you have the audio data in the vox file! See code below for the different types of Vox files... read more...

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Removes DC offset(alvas.net)

submitted by alvasnet(550) 8 months, 2 days ago

DC offset is an offsetting of a signal from zero. It occurs when hardware, such as a sound card, adds DC offset to the recorded audio signal. DC offset is shift of the red line comparatively to the black one on figure below... read more...

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Converts Mp3 Joint Stereo to mono(alvas.net)

submitted by alvasnet(550) 8 months, 2 days ago

Question: Have you got any issues with "Joint-Stereo" MP3's? I have a customer who sends me the attached MP3 and when I convert it to a mono format, it effectively cancels out the audio. Answer: The problem is that in Mp3 Joint Stereo sound file mirror is opposite... read more...

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Resampling and noise(alvas.net)

submitted by alvasnet(550) 8 months, 2 days ago

Very often we have to change the sampling rate, number of channels and the size of a sample when converting from one format to another. You can use AudioCompression.Convert method for these purposes. Unfortunately, for the uncompressed PCM -> PCM this leads to a significant reduction in sound quality and appearance of extraneous noise. We can verify this by example... read more...

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Alvas.Audio Readers.(alvas.net)

submitted by alvasnet(550) 8 months, 2 days ago

Audio Readers is a hierarchy of Alvas.Audio classes that implement IAudioReader interface used to read format and audio data. AudioReader is a base class for the readers that can read an audio data from the stream. This class is abstract. AuReader class reads an audio data from the .AU and .SND streams. AviReader class reads audio data from the Avi stream. WaveReader class reads WAVE (waveform audio format) data from the stream. RawReader class reads an audio data from the headerless stream. Slinear, Gsm, A-law, mu-law etc. For that, you need to specify explicitly the format of the audio data that they contain. Mp3Reader class reads audio data from the Mp3 stream. DsReader class reads audio data using DirectShow. List of supported formats can be expanded with additional DirectShow filters installed. Use Combined_Community_Codec_Pack, K-Lite_Codec_Pack or Ffdshow to expand the list of supported formats... read more...

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Asp.Net Audio Converter(alvas.net)

submitted by alvasnet(550) 8 months, 15 days ago

Converts audio files with Alvas.Audio in Asp.Net application as easy as in Windows Forms, WPF, Windows Service and Console Apps. You need Upload audio file. Select your audio file from list on the server. Select audio format from list with available audio formats. Press “Convert” button and download result audio file. ... read more...

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Alvas.Audio and WPF(alvasnet.blogspot.com)

submitted by alvasnet(550) 9 months, 1 day ago

For using Windows Forms controls in Windows Presentation Foundation(WPF) application needs: Add reference to WindowsFormsIntegration assembly (in WindowsFormsIntegration.dll) to your project. Add reference to System.Windows.Forms assembly (in System.Windows.Forms.dll) to your project. In the Window element, add the following namespace mapping ... read more...

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Alvas.Audio now supports x64 mode on 64-bit operating systems.(alvas.net)

submitted by alvasnet(550) 10 months, 6 days ago

Alvas.Audio 8.1 version has been published. New features: Supports x64 mode on 64-bit operating systems. WaveformVisualizer draws picture of the sound amplitude-time representation (Waveform). Removes DC offset. DC offset is an offsetting of a signal from zero. Occurs when hardware, such as a sound card, adds DC offset to a recorded audio signal. AuReader reads an audio data from the .AU and .SND streams. ToFormat method converts audio data to the specified audio format. Normalize method raises the volume so that the highest sample level reaches a maximum level. Swaps stereo channels. Inverts the audio signal to 180 degrees. All positive values in the wave form are replaced by negative and vice versa. Frees memory previously allocated for audio format. Creates 32-bit IEEE Float audio format. Performs resampling audio data from and to 8/16/24/32-bit integer PCM and 32-bit IEEE Float audio formats. read more...

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Alvas.Audio new 7.7 version has been published.(alvas.net)

submitted by alvasnet(550) 1 year, 1 month ago

New features: Support audio filters such as Chorus, Compressor, Distortion, Echo, Flanger, Gargle, I3DL2Reverb, ParamEq, WavesReverb. Helper for converting Mp3 file to Wav file with PCM (Pulse-code modulation) data Helper for decoding audio data in PCM (Pulse-code modulation). Helper for decoding audio data in PCM (Pulse-code modulation) 16 bit Create fade in/out effect Create silence read more...

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Alvas.Audio 7.1 has been published.(alvas.net)

submitted by alvasnet(550) 2 years ago

Whats new (version 7.1): Writes ID3 tag version 1 from MPEG Layer3 streams. Writes INFO metadata(similar mp3 tags) from Wave streams. Checks audio signal silence... read more...

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Communicate with aliens on IronPython (ending)(alvasnet.blogspot.com)

submitted by alvasnet(550) 2 years ago

Previously, we are talking with aliens in C#, Nemerle, Boo and F#. Now let's try to do the same on IronPython. See code below... read more...

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How can be one audio file mixed to another in VB.Net?(alvasnet.blogspot.com)

submitted by alvasnet(550) 2 years, 1 month ago

Visual Basic .Net example for mixing one audio file to another... read more...

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Communicate with aliens on F# (continued)(alvasnet.blogspot.com)

submitted by alvasnet(550) 2 years, 1 month ago

Previously, we are talking with aliens in C#, Nemerle and Boo. Now let's try to do the same on F#. See code below... read more...

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How to determine the silence in .Net?(alvasnet.blogspot.com)

submitted by alvasnet(550) 2 years, 1 month ago

Question: I have to connect to a SHOUTcast stream, take 5 seconds of the sound then detect if there is silence (no sound above -14db). Would you be so kind to provide us with some sample... read more...

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Communicate with aliens on Boo (continued)(alvasnet.blogspot.com)

submitted by alvasnet(550) 2 years, 1 month ago

Previously, we are talking with aliens in C# and Nemerle. Now let's try to do the same on Boo. See code below... read more...

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