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Echo AIO User Manual

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  • Page 3 ECHO AIO TEST SYSTEM USER MANUAL...
  • Page 4 Echo Test + Measurement and Echo AIO are registered trademarks of Echo Digital Audio Corporation. Windows is a trademark of Microsoft Corporation. macOS, Mac, and Macintosh are trademarks of Apple, Inc.

  • Page 5: Limited 3 Year Warranty

    Limited 3 Year Warranty Echo warrants its products to be free of manufacturing defects for a period of three years from the date of purchase. Any product covered under a valid Echo new product warranty—where the damage is not caused by owner misuse or abuse (see Warranty Exclusions, below)—will be repaired or replaced by Echo free of charge.

  • Page 6: Safety Instructions

    7. Power Sources—This unit should be operated only from a stable AC power source as indicated in this documentation or on the Echo AIO. A surge protector is recommended in areas that are subject to lightning or noise from industrial equipment such as that found on a factory floor.

  • Page 7: Table Of Contents

    Amplifier Outputs ................................12 6. Digital I/O ............................15 TDM ....................................... 15 7. Miscellaneous I/O ..........................17 5 VDC Fixed Power Supply ............................17 5 VDC Variable Power Supply (Battery Simulator) ..................17 Aux (GPIO) ..................................17 Echo AIO Test System User Manual...
  • Page 8 File Menu ................................... 25 Help Menu ..................................26 9. Programmatic Control ......................... 27 Command-line Application ............................27 API ......................................27 LabVIEW Driver ................................27 10. Specifications ..........................29 Data ..................................... 29 Graphs ....................................31 Echo AIO Test System User Manual...

  • Page 9: Introduction

    1. Introduction The Echo AIO Test System is a USB 2.0 compliant audio test platform compatible with ASIO and WASPI drivers on Windows computers and Core Audio on Macintosh (Mac) computers. When coupled with a computer running test software, AIO forms a complete system for testing digital and analog audio electronics and acoustics in consumer and professional products.
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  • Page 11: Installation

    Connect the locking power cable supplied with the AIO to the locking IEC C14 power inlet. Both locking and non- locking cables may be used. For reliability, the AIO does not have a power switch. The blue LED on the front panel indicates when power is applied and the AIO is operating.

  • Page 12: Rd Party Test And Measurement Software

    Echo AIO ASIO driver. Because ASIO is a digital interface, all levels are communicated between the hardware and software as digital values, and there’s no inherent conversion to actual analog I/O values when using an analog interface.

  • Page 13: Hardware Configurations

    The product name is based on the combination of installed modules (i.e.: AIO-SA has one AIO-S and one AIO-A module). Common configurations are listed in the table below. Table 2 Common AIO configurations...
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  • Page 15: Hardware Modules

    The Acoustic test module (AIO-A) is designed for making basic acoustic measurements of a device under test (DUT)—typically a speaker or driver. Ideal for use with measurement microphones, ear simulators, artificial heads, speakers, actuators, and mouth simulators. AIO-A maps to the audio driver as 4 input channels and 2 output channels.

  • Page 16: Line (Aio-L)

    Figure 7 AIO-H module Line (AIO-L) The Line-level test module (AIO-L) is designed for making basic acoustic and electrical measurements of a device under test (DUT). It features balanced line outputs, which are useful both for interfacing to balanced audio devices, and for interfacing to single-ended devices where ground isolation is desired.

  • Page 17: Tdm (Aio-T)

    The TDM test module (AIO-T) provides a 10 channel TDM (Time-Division Multiplexed) interface for connection directly to audio converters or other ICs. The AIO-T Module maps to the audio driver as 10 input channels and 10 output channels. The module functions as a TDM master (MASTER mode), sourcing the clocks and synchronization signals or as a TDM slave (SLAVE mode) syncing all data and audio clocks to SCLK and SYNC.
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  • Page 19: Analog I/O

    Calibration using external calibrators will usually be more accurate and is the recommended best practice. The AIO mic/line inputs can read TEDS data and return it to the AIO control panel. The TEDS levels can then be cut and pasted or manually entered into the audio analysis software.

  • Page 20: Amplifier Outputs

    Precision current sense resistors are placed in series with the outputs. A voltage across these resistors is generated by the signal and is monitored using input 4 of the AIO-H module. The sense resistor voltage can be used to derive the current through the connected driver. The left or right channel is selected via the AIO control panel.
  • Page 21 + and - pins of the SPKR output and is monitored using input 4 of the AIO-S module. The sense resistor voltage can be used to derive the current through the connected speaker.
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  • Page 23: Digital I/O

    IN: Data input, can contain up to 10 channels of 24-bit audio. Logic Levels I/O logic levels can set to either 1.8V or 3.3V via the AIO control panel, command line interface, or APIs. Termination Outputs are high-drive capability, with a series resistance of 50 Ω. Inputs have an input impedance of 10K Ω.
  • Page 24 Delays FSYNC and audio input sampling by ½ bit FSYNC position Sets the position of the positive portion of FSYNC relative to the start of frame FSYNC width Sets the width of FSYNC in bits Echo AIO Test System User Manual...

  • Page 25: Miscellaneous I/O

    Aux (GPIO) The AIO-C module features 8 open drain TTL level (GPIO) outputs capable of sinking up to 250mA of current on a female 9 pin locking D-sub connector and 8 TTL level (GPIO) inputs on a male 9 pin locking D-sub connector.

  • Page 26: Environmental (Pressure, Temperature, Humidity)

    (or even hour to hour) and can have a significant impact on acoustic measurement accuracy. The AIO-C module is unique in the world of audio testing devices by providing an interface for making these important baseline measurements. The sensor connects to the AIO-C module through a 4-pin locking M-12 connector.

  • Page 27: Control Panel

    AIO hardware control only. It does not perform any audio analysis. Channels Tab The Channels tab shows the input and output channels of the connected AIO test system. It allows levels to be monitored and configuration options, which vary depending on the type of module installed, to be set.
  • Page 28 (A) and numerically (B). Use the drop-down control to select the desired units (C). The appearance and features will vary depending on the AIO modules that are installed. Click the caret (D) to expand or condense the channel display for each module type. In the condensed view, only the bar-graphs are visible.

  • Page 29: Tdm Tab

    Pascals/Volt. TDM Tab The TDM tab is displayed if the AIO test system has an AIO-T module installed. For further details on the TDM tab settings, refer to the Digital I/O section on page 15. Echo AIO Test System User Manual...

  • Page 30: Aio-C Tab

    Figure 19 TDM tab AIO-C Tab The AIO-C tab appears if the AIO-C module is installed in the AIO test system. Its controls and indicators are described below. The module firmware revision and serial number are indicated in the lower right corner.

  • Page 31: Options Tab

    Pressure, temperature, and humidity data readouts from the attached PTH sensor. Options Tab The Options tab contains information about the connected AIO test system and allows various configuration options to be set. Its controls and indicators are described below. Echo AIO Test System User Manual...
  • Page 32 Outer slot: The AIO module detected in the outer slot. Custom name: Allows you to set a custom USB device name for this AIO test system. This is primarily useful if you have multiple AIOs connected to a single computer. The device name is persistently stored in flash memory in the AIO.

  • Page 33: File Menu

    File Menu Figure 22 File menu The File menu allows you to open and save sessions. An AIO session stores all the current hardware settings in a text file that can be used to reset the hardware to a previous state.

  • Page 34: Help Menu

    Help Menu The Help menu contains a single item: “About AIO Control Panel”. The “About” window shows the version number and build date of the currently installed control panel application. Figure 23 AIO “About” window Echo AIO Test System User Manual...

  • Page 35: Programmatic Control

    Reference, which may be downloaded from the Echo Test+Measurement website. AIO includes a C library dll which makes it possible to control the AIO test system from a variety from your own code. For documentation, refer to the AIO API Reference, which may be downloaded from the Echo Test+Measurement website.
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  • Page 37: Specifications

    < -122 dB (20 Hz – 20 kHz) Crosstalk: < -70 dB (20 Hz – 20 kHz) Phase error: < ±0.1° @ 20 kHz Phase error: < ±1.2° @ 20 kHz Impedance measurement accuracy: ≤ 0.5% (20 Hz – 20 kHz) Echo AIO Test System User Manual...
  • Page 38 Battery simulator, setting resolution 1 mV (all) General Power: 90 – 264 VAC, 50/60 Hz, 60 W 17.5” (44.4 cm) x 8.75” (22.2 cm) x Dimensions: 1.75” (4.4 cm) Weight: 42.5 lbs (19.3 kg) Echo AIO Test System User Manual...

  • Page 39: Graphs

    Graphs Mic-Line Input Frequency (Hz) Figure 24 Frequency Response (48k SR) Frequency (Hz) Figure 25 Frequency Response (96k SR) Echo AIO Test System User Manual...
  • Page 40 Frequency (Hz) Figure 26 Frequency Response (192k SR) 0.01 0.001 0.0005 Input Level (dBV) (Blue = Gain 1x; Green = Gain 10x; = Gain 100x) Figure 27 THD+N Ratio vs Input Level (48k SR) Echo AIO Test System User Manual...
  • Page 41 -100 -110 Frequency (Hz) Figure 28 THD+N Ratio vs Frequency (48k SR) Line Output Frequency (Hz) Figure 29 Frequency Response (48k SR) Echo AIO Test System User Manual...
  • Page 42 Frequency (Hz) Figure 30 Frequency Response (96k SR) 50k 90k Frequency (Hz) Figure 31 Frequency Response (192k SR) Echo AIO Test System User Manual...
  • Page 43 0.01 0.001 0.0005 Output Level (dBV) Figure 32 THD+N Ratio vs Output Level (48k SR) -100 -110 Frequency (Hz) (Blue = Unbalanced; = Balanced) Figure 33 THD+N Ratio vs Frequency (48k SR) Echo AIO Test System User Manual...
  • Page 44 Headphone Output Frequency (Hz) Figure 34 Frequency Response (48k SR) Frequency (Hz) Figure 35 Frequency Response (96k SR) Echo AIO Test System User Manual...
  • Page 45 50k 90k Frequency (Hz) Figure 36 Frequency Response (192k SR) 0.01 0.001 0.0005 100m 200m 500m Output Level (Vrms) Figure 37 THD+N Ratio vs Output Level (48k SR) Echo AIO Test System User Manual...
  • Page 46 (Blue = 32 Ω; = 16 Ω) Figure 38 THD+N Ratio vs Frequency (48k SR) Amplifier Output -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 Frequency (Hz) Figure 39 Frequency Response (48k SR) (8 Ω load) Echo AIO Test System User Manual...
  • Page 47 0.01 0.005 100m 200m 500m Output Level (Vrms) Figure 40 THD+N Ratio vs Output Level (48k SR) (8 Ω load) Echo AIO Test System User Manual...

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