Teledyne LeCroy’s Serial AudioBus trigger, decode, and graph package provides all the tools needed to properly analyze and debug digital audio buses. Teledyne LeCroy’s solution addresses the I2S, LJ, RJ, and TDM variations of the audio bus standard.
Teledyne LeCroy’s Audiobus decode enables the unique View Audio feature that converts the digitally-encoded serial data audio signal into an analog waveform display. This provides an intuitive way to understand circuit problems causing clipping, glitches, and other anomalies in the audio circuit. It also helps show the effects of the audio signal before Digital Signal Processing (DSP). View Audio can be performed for up to four audio channels for conventional Left/Right audio, or home cinema applications (enabled by time division multiplexed audio buses).
Audiobus uses color-coded overlays on various sections of the protocol decode for an easy-to-understand visual display. This Teledyne LeCroy exclusive feature is intuitive to experienced audio engineers and especially useful for users new to the I2S, LJ, RJ, or TDM Audiobus standards. The decode information condenses or expands depending on the timebase/ zoom ratio setting, simplifying both routine verification and complex troubleshooting. Choose to decode into Hex, Binary, Decimal, or dB formats.
The Audiobus trigger can be configured for I2S, LJ, or RJ variants. Powerful conditional triggering can be applied to either left or right channel data, while unique triggers like mute, clip, and glitch help isolate rare problems not easily detected by viewing decoded data alone.
| AudioBus TD | AudioBus TDG |
| Definition | |
| Protocol Setup | DATA Select MSB or LSB (TDM only) Select Length (8, 12, 16, 18, 20, 24, 28, or 32-bits) Select Justification (Left or Right justified with respect to frame sync’s transition) Select Start bit (TDM only) SYSTEM BIT CLOCK POLARITY
Select data latch on Rising (1) or Falling (0) edge WORD SELECT (FRAME SYNCH)
Select Word Length (8, 12, 16, 18, 20, 24, or 32-bits long) or Bit Length (one bit long) Select Frame Start (High or Low) Select Alignment (Together with Data Word (Right Justified or Left Justified), or 1-bit Earlier (I2S) ) Also, may select I2S, Left Justified, Right Justified, or TDM default setups. | DATA Select MSB or LSB (TDM only) Select Length (8, 12, 16, 18, 20, 24, 28, or 32-bits) Select Justification (Left or Right justified with respect to frame sync ''s transition) Select Start bit (TDM only) SYSTEM BIT CLOCK POLARITY
Select data latch on Rising (1) or Falling (0) edge WORD SELECT (FRAME SYNCH)
Select Word Length (8, 12, 16, 18, 20, 24, or 32-bits long) or Bit Length (one bit long) Select Frame Start (High or Low) Select Alignment (Together with Data Word (Right Justified or Left Justified), or 1-bit Earlier (I2S) ) Also, may select I2S, Left Justified, Right Justified, or TDM default setups. |
| View Audio Waveform | |
| Format | N.A. | For I2S, LJ, RJ:
View Left, Right, or both analog channels
For TDM mode:
View channels 1–8 |
| Decode Capability | |
| Format | Hexadecimal, Binary, Decimal, dB. | Hexadecimal, Binary, Decimal, dB. |
| Decode Setup | Threshold definition required. Default is to Percent amplitude. | Threshold definition required. Default is to Percent amplitude. |
| Decode Input | Any analog Channel, digital Channel (MS-250 or MS-500), Memory or Math trace. Clock and/or FrameSynch/Word Select channel may be turned OFF and data will still decode (reduces screen clutter). | Any analog Channel, digital Channel (MS-250 or MS-500), Memory or Math trace.
Clock and/or FrameSynch/Word Select channel may be turned OFF and data will still decode (reduces screen clutter). |
| # of Decoded Waveforms | Up to 4 buses may be decoded at one time. In addition, zooms can be displayed (with decoded information). | Up to 4 buses may be decoded at one time. In addition, zooms can be displayed (with decoded information). |
| Location | Overlayed over DATA waveform, on Grid. | Overlayed over DATA waveform, on Grid. |
| Visual Aid | Color Coding for right Channel and left Channel. (Ch 1–8 for TDM) Decode information is intelligently annotated based on timebase setting. | Color Coding for right Channel and left Channel. (Ch 1–8 for TDM)
Decode information is intelligently annotated based on timebase setting. |
| | Trigger Capability | |
| Format | Hexadecimal, Binary. | Hexadecimal, Binary. |
| Trigger Setup | Trigger on DATA, Clip, Glitch, Mute. | Trigger on DATA, Clip, Glitch, Mute. |
| DATA Condition Setup | <=, <, =, >, >=, <>, in range, out of range, don’t care. | <=, <, =, >, >=, <>, in range, out of range, don’t care. |
| DATA Setup | Hexadecimal: # Data Bits = 1 to 32.
Data can be defined by nibble.
Binary: Any combination of 0,1, or X for 1–32-bits in 4-bit increments. | Hexadecimal: # Data Bits = 1 to 32.
Data can be defined by nibble.
Binary: Any combination of 0,1, or X for 1–32-bits in 4-bit increments. |
| Bit Rates | Any. Auto-detected. | Any. Auto-detected. |
| Trigger Input | I2S, LJ, and RJ only.
Any analog or digital (MS-250 or MS-500) Channel or the EXT input. Clock or Frame Synch/Word Select may be input to EXT to conserve available analog Channels. | I2S, LJ, and RJ only.
Any analog or digital (MS-250 or MS-500) Channel or the EXT input. Clock or Frame Synch/Word Select may be input to EXT to conserve available analog Channels. |
| Trigger Design | Internal to oscilloscope, settable like any other oscilloscope trigger. | Internal to oscilloscope, settable like any other oscilloscope trigger. |
| | Search Capability | |
| Pattern Search | Search by message or pattern in hexadecimal formats. | Search by message or pattern in hexadecimal formats. |
| | Oscilloscope Capability | |
| Compatible With… | TD (Trigger and Decode) Option fully compatible with WaveRunner® Xi/Xi-A, WaveSurfer® Xs/Xs-A. | TDG (Trigger, Decode and Graph) Option fully compatible with WaveRunner® Xi/Xi-A |