The Hills Come Alive with Antelope Audio and «The Earth Harp»

Artist and Instrument Craftsman William Close Turns to Antelope to Capture Unique and Unprecedented Recording, Using Natural Valley as the Instrument’s Resonating Chamber

Ever since his art school days in the late 1990′s while attending the prestigious Chicago Art Institute, William Close pursued his dream of building and performing with unique, handmade instruments whose sounds have never been heard anywhere in the world. Now, The Earth Harp, his masterpiece instrument creation of unprecedented physical scale and sonic beauty, has been captured in astonishing fidelity in a brand new recording — thanks to the digital clocking and conversion technology of Antelope Audio.
His new album with The Earth Harp Collective, Behind the Veil, captures the authentic sound of this spectacular instrument — from its lavish root notes to its rich harmonics and heavenly overtones. Close attributes the success of the recording in large part to Antelope Audio’s new Rubicon A to D converter, which was used as the primary mastering device, and its Orion³² multi-channel interface, which was used during playback. «I’ve never heard The Earth Harp sounding so good on a recording,» he says. «The instrument has so many beautiful harmonics and overtones, and many times these are lost in the process. The Antelope equipment was awesome and helped us finally achieve a true representation of how The Earth Harp actually sounds.»
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Audio Master Clocks Fundamentals and Application Notes — Part 2

What devices need clocking?
In a simple system featuring one audio interface with built-in mic preamps connected to a computer-based DAW, the interface clocks the DAW since the most clock-critical element of the audio chain is the A/D converter, as that’s built in to the interface. If you were to add an external digital device to the equation (reverb, multi-effects processor etc), it should be configured to work as a clock slave to the interface.
Following that logic, even in bigger and more complex studios, it’s generally best to use an A/D as the master clock. If there’s more than one of these you’ll need to decide which one to use as the master, and everything else will have to be slaved to that. It’s quite possible that there will be audible differences between various configurations, because most A/Ds will perform slightly differently when configured as clock master and slave.
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Audio Master Clocks Fundamentals and Application Notes — Part 1

Trinity_Master_ClockWhy do we need clocks?
In order for an analog signal to be digitized, it must be sampled precisely and accurately in repeating intervals. The master clock provides that timing information and allows the waveform to be reconstructed as an analog signal correctly (assuming the sample rate is more than twice the highest frequency component of the audio signal being sampled). The clock identifies when each individual sample should be recorded or re-played (word clock).
If the clock timing varies, the audio samples will possibly be replayed or recorded at the wrong time resulting in sound distortion, jitter and aliasing. Jitter is the erroneous capture of a wave form over time. Although the apparent error to the clarity of the audio this creates there are other artifacts that maybe introduced with bad clocking.
Another type of clock is the ‘bit clock’. This is used in serial data interfaces like AES, S/PDIF and ADAT, where there is basically only one ‘conduit’ over which to pass the audio data. The bit clock ensures that the receiving device does not lose track of when each data bit stops and the next begins, eliminating the potential result in corrupted data values being received.
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Некоторые важные аспекты А/Ц и Ц/А преобразования и разработки устройств синхронизации класса High-End

Igor Levin
Предлагаем вашему вниманию интервью с Игорем Левиным, опубликованное в 2012 году в журнале Audio Times. В интервью Игорь отвечает на вопросы о некоторых важных аспектах А/Ц и Ц/А преобразования и разработки устройств синхронизации.
Независимо от частоты дискретизации, какие элементы нужно учитывать при создании хорошего А/Ц- и Ц/А-конвертера?
Примерно двадцать лет назад, когда я создал свой первый Ц/А преобразователь, я захотел сделать для него устройство синхронизации. В то время синхронизатор нельзя было просто пойти и купить в магазине. Поэтому я сделал первые «часы» для своего первого Ц/А преобразователя. Покупателям понравился мой преобразователь, но они особенно высоко отзывались о новом устройстве синхронизации. Именно тогда я осознал важность стабильной синхронизации для цифрового аудио.
Я по-прежнему считаю, что точные «часы» — основной фактор успешного преобразования. На самом деле, с годами чипы становятся лучше, и проблема «артефактов» (местных искажений) отходит на второй план. Сегодня, как никогда раньше, на передний план выходит точность синхронизации. Я бы сказал, что она уже составляет по меньшей мере 75% от общего качества звука. Конечно, есть ряд других важных факторов, таких как правильное расположение элементов, стабильный источник питания, регулятор громкости на базе аналоговых решений и т.д.
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