Rosendahl nanoclocks GL 数字音频同步锁相主时钟批发零售 时钟  

 

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nanoclocks GL 数字音频同步锁相主时钟

数字音频同步锁相主时钟

新版本带两个参考输入用于标清和高清视频同步或者音频时钟，直接用户交互界面，19 英寸机架适配件。

应用特点

u 字时钟或AES11/DARS信号在A或B输入会直接路由到全部12个输出

u 根据现有的信号输入，采样率被显示并输出切换至字时钟或AES11电平

u 也会分配所有的非标准的字时钟和AES11信号，例如50KHz

u 每个独立输出的输出模式可被设置为字时钟，AES11 DARS或者用户自编程信号

u 当音频时钟同步到视频参考或其他参考信号时，重要的不是追踪中断和故障，而是为了保持和维护相位锁，当参考信号失败时非常顺滑地再次锁定

u 每个独立输出的输出模式可被设置为字时钟，AES11 DARS或者用户自编程信号

技术特性

u 标准的44.1,88.2,48和96KHz的音频时钟

u 提供最好的时钟质量和最低的相位噪声

u 音频晶振调至TCXO时基精度至0.2ppm

u 内部标清视频同步23.98,24,25（PAL）或29.97（NTSC）帧每秒

u 高清三电平同步23.98,24,25,29.97,50,59.97或60帧每秒

u 全部标清、高清视频帧速和标准会被自动检测

u 两个参考输入中其中一个信号有问题，可自动倒换至另一输入

u 音频参考信号同步于同步内部音频时钟发生器

u 时钟质量不受进来的参考信号抖晃率的影响

u 手动选择A或B输入或使用自动倒换功能

u USB：全兼容音频设备MIDI端口

u 免费Mac OSX和Windows平台控制软件

 

 

digital audio genlock masterclock

new version with two reference inputs for SD/HD video syncs or audio clocks, straightforward user interface, 19" rack mount brackets included

 

AUDIO CLOCK GENERATION

 

The standard 44.1, 88.2 , 48 and 96 kHz audio clocks are generated directly from discrete crystal oscillators working in fundamental mode without DDS (direct digital synthesis) or PLL (phase locked loop) circuits in the clock signal path.

 

This vintage technology is not as universal as today's digital clock synthesis circuits because it is limited to only one sample rate (+/- 50ppm) per crystal oscillator, but on the other hand it still provides the purest clock quality with lowest phase noise.

 

Nanoclocks GL also generates -0.1% pull down sample rates using fractional division and a very high frequency PLL circuit.

 

REFERENCE = INTERNAL

 

Audio crystal oscillators are tuned to a TCXO timebase accurate to 0.2 ppm.

 

REFERENCE = VIDEO

 

Audio crystal oscillators are locked to

external SD video syncs with 23.98, 24, 25 (PAL) or 29.97 (NTSC) fps or

HD tri-level syncs with 23.98, 24, 25, 29.97, 50, 59.97 or 60 fps.

All SD/HD video frame rates and standards are detected automatically.

 

Where possible, audio clocks will also be phase locked to video v-syncs (requires a whole-number proportion of sample rate and frame rate). Two reference inputs provide automatic switchover in case of one reference signal fails.

 

REFERENCE = AUDIO

 

Audio crystal oscillators are tuned to external word clock or AES-11 DARS signals.

Automatically follows 44.1, 48, 88.2, 96 kHz and -0.1% pull down sample rates.

Lock range is +/- 50ppm.

 

The audio reference signals are used to synchronise the internal audio crystal clock generators accordingly, so clock quality is not affected by incoming jittery reference signals.

Select signal from input A or B manually or use the automatic switchover functionality.

 

REFERENCE = DISTRIBUTION AMPLIFIER

 

Word clock or AES11/ DARS signals on inputs A and B are directly routed to all 12 outputs.

Detected sample rates are displayed and outputs are switched to word clock or AES11 levels according to the present input signal. This mode also distributes all word clock/AES11 signals at non-standard sample rates, i.e. 50kHz.

 

TERMINATION AND OUTPUT MODE

 

The connection status of the each clock outputs can be monitored by 12 LEDs:

off: output is open

green: 75Ω terminated

red: double, low terminated.

The output mode of each individual output can be set to word clock, AES11 DARS or a user programmable signal.

 

PROGRAMMING

 

The unit can be controlled and its firmware can be updated via USB MIDI.

 

GENLOCK

 

When synchronising audio clocks to video syncs or other reference signals, it is important not to track disruptions or glitches, to hold and maintain phase lock, to hold the actual tuning when the reference signal fails and to relock very smoothly.

For many years, Rosendahl Studiotechnik has been developing and improving software algorithms to synchronise clocks together.

 

POWER SUPPLY

 

The unit can be supplied by mains (115/230 VAC switchable) and/or 12V DC using a 4-pin XLR connector, which provides a redundant power system if both power sources are being used.

The AC power supply uses a vintage (again!) mains transformer combined with a power saving secondary switching regulator.

It is designed for maximum reliability and life span. We know that a reliable master clock generator is an essential part of any studio.

 

nanoclocks GL consumes 7 watts only. With one unit running 24/7 for 10 years, this results in 613 kWh or 215.-� (at 35ct/kWh) of consumed energy.