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Audio Effects
Overview Ittiam Audio Effects is a suite of audio post processing algorithms that enables the users to personalize audio to their preferences for a rich listening experience. These algorithms, with superior sound quality, low memory footprint and processor loading are specially suited for portable audio players and mobile phones. The software suite includes following components
Components Bass and Treble Bass and Treble controls are used for low and high frequency enhancements respectively. Controls are provided to boost or cut frequencies below a user defined cutoff frequency. The mid-range frequencies remain unaltered.
Graphic Equalizer Graphic Equalizer is a set of filters that modifies the frequency envelope of audio. Each filter controls a fixed range of audio frequencies. The gain for each band can be controlled by the user. Control is provided by means of sliders for each band (filter).
Parametric Equalizer Parametric Equalizer is a set of filters that modifies the frequency envelope of audio with controls for the center frequency (f0), the bandwidth (BW) and the gain (G) for each band to be varied by the user.
Stereo Widening While listening to music over headphones, the sound image is created within the head. This causes listening fatigue. The Stereo Widening component uses psychoacoustics to create the sound image outside the listener's head. This makes listening to music over headphones a comfortable and pleasant experience, avoiding listening fatigue. Stereo Widening can also be used for loud speaker playback to expand the sound image by creating virtual speakers at a wider angle with respect to the listener.
Reverb Reverberation refers to sounds reflected from the walls and other surfaces in an enclosure such as a room or a hall. This is what makes a small room 'sound' different from a large hall. When a sound source generates a sound, it reaches the ear directly (direct sound) and also after bouncing off the walls and the ceilings. These reflected sounds increase in density from sparse echoes (early reflections) to highly dense echoes (late reverb) over time. Ittiam Reverb algorithm simulates many different listening environments and can be enabled with the presets for Concert Hall, Large Room, Medium Room, Small Room and Plate reverb. Peak Limiter Peak limiters are used in the audio chain to provide an upper limit to the peak value of the audio content without introducing any distortion due to clipping. Signals exceeding the user defined limit are intelligently processed to bring them within the limit in such a fashion that the operation is transparent to the listener. Applications include CD mastering, mixing or as a last block in the audio chain as an alternative to the saturation logic.
DRC - Dynamic Range Control DRC reduces the dynamic range (range of audio level variation from lowest to the highest level) of audio by increasing the level of the soft passages and decreasing the level of loud sections in the audio content. DRC addresses the problem of listening to music in the presence of ambient noise, for example, in a crowded street or a railway station. In such noisy environments, if the volume is set low, the soft passages will be drowned in the ambient noise and an increase in volume will make the loud sections annoying. With DRC, the listener can enjoy music even in a noisy environment without having to touch the volume control. DRC also enables the listener to watch sci-fi/action movies in very quiet environments without disturbing others.
Virtual Surround Virtual Surround technology enables the listener to enjoy 5.1 multichannel content over headphones or two speakers. Downmixing of multichannel audio to 2 channels by simple matrixing results in a loss of spatial information embedded in the multichannel content. Virtual Surround on the other hand uses sophisticated signal processing to create an illusion that the sound is emanating from 5 speakers around the listener when listening over headphones or two speakers.
Features and Benefits
Target Applications and Segments
Supported Devices
Contact For further information, including availability and performance of components on specific devices, contact mkt@ittiam.com
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