Sony STR-DA3100ES - Fm Stereo/fm-am Receiver Технічна інформація - Сторінка 24

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Controlling the signal flow with HATS

The design of the interface is exceptional because communicating six

streams of 2.8224 MHz digital samples raises exceptional challenges.

Conveying 1-bit signals at such high data rates and synchronizing the signals

with the receiver's master clock would normally expose the signal to the time-

base errors called jitter. Jitter translates directly into time-based distortion of the

audio waveform.

Sony overcame this challenge with the High quality digital Audio

Transmission System (HATS). HATS uses "command-based rate control of

isochronous data flow" to solve the problem. The system incorporates three

principal elements.

1. Variable-speed transmission from the player.

2. Buffer memory in the receiver.

3. Command signals from the receiver to the player, controlling transmission

speed.

DVP-NS9100ES

With Sony HATS, audio data flows from the player to the receiver's

buffer memory, according to rate control commands from the receiver.

Reproduction in the receiver achieves the full time base accuracy of the

receiver's quartz crystal master clock.

The receiver continually monitors the amount of audio data in its buffer

memory. When the buffer memory reaches its lower limit, the receiver

commands the player to increase data transmission speed. When the buffer

memory reaches its upper limit, the receiver commands the player to decrease

transmission speed. And when the buffer memory is between the upper and

lower limits, the receiver commands the player to transmit at normal speed.

In this way, HATS makes it unnecessary to synchronize a jitter-prone

signal with the receiver master clock. Instead, the buffer memory outputs a jitter-

free signal at the full quartz-crystal accuracy of the receiver's master clock. You

ES Receivers v1.0

STR-DA7100ES

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