Astoundstereo license

Conventional FIR filters were sampled at a However, in today's audio production environments, higher sampling rates may be desired. The low frequency band then may be down-sampled to the sampling frequency of the conventional HRTF filters and subsequently processed by the localization algorithm at a Meanwhile, the high frequency band may be retained for later processing.

After the localization processing has been applied to the low frequency band, the resulting localized signal may be again up-sampled to the conventional sample rate and mixed with the high frequency band. In this manner, a bypass for the high frequencies may be created in the original signal that would not have survived sample rate conversion to However, this may imply two additional sample rate conversions that to be applied to the processed signal, and therefore, may represent a higher processing load when processing the more frequently encountered sample rates like Because the Conventionally, for the numerous e.

This averaging process identified 4 distinct peaks in the frequency spectrum of the conventional filter set that deviated from a flat magnitude causing the filters to colorize the signal in potentially undesired ways. Although 4 distinct frequencies have been discussed herein, it should be noted that any number of distinctive frequency equalization points are possible and a multi-band equalizer may be implemented, where each distinct frequency may be addressed by one or more bands of the equalizer.

In some embodiments, low frequencies may not need to be localized. Additionally, in some cases, localizing low frequencies may alter their presence and impact the final output audio. Thus, in some embodiments, the low frequencies present in the input signal may be bypassed. For example, the signal may be split in frequency allowing the low frequencies to pass through unaltered.

When preparing the final mixing of the localized signal with the bypassed low frequency signal, prior to final output, the time delay introduced into the localized signal by the inter-aural time difference ITD may cause both signals to have different relative time delays.

This time delay artifact may create a misalignment in phase for the low frequency content at the transition frequency when it is mixed with the localized signal. Thus, in some embodiments, delaying the low frequency signal by a predetermined amount using an ITD compensation parameter may compensate for the phase misalignment.

In some cases, the phase misalignment between the localized signal and the bypassed low frequency signal may cause the low frequency signal to be attenuated to a point where it is almost cancelled out.

Flipping the signal in this manner may change the attenuation into a boost, bringing back much of the original low frequency signal.

In some embodiments, the low frequencies may have an adjustable output gain. This adjustment may allow for filtered low frequencies to have a more or less prominent presence in the final audio output. A method for improving sound localization of the human ear, the method comprising the acts of creating virtual movement of a plurality of localized sources by applying a periodic function to one or more location parameters of a head related transfer function HRTF.

USP true USB2 en. EPA4 en. JPB2 en. CNB en. WOA1 en. Information processing system, information processing apparatus, storage medium having stored therein information processing program, and information processing method.

Method and apparatus for decoding stereo loudspeaker signals from a higher order ambisonics audio signal. Device and method for calculating loudspeaker signals for a plurality of loudspeakers while using a delay in the frequency domain.

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