ABS1 — Audio Bit Spitter Portable Digital/Analog Audio Generator

DIGITAL

Digital Input Standard AES/EBU 110Ω transformer balanced on 3 pin XLR connector Level : 200mVpp to max 7Vpp Digital Output Standard AES/EBU 110Ω transformer balanced on 3 pin XLR connector Level : 5 Vpp 110Ω terminated Jitter (EXT REF) Less than 5 nsec avg. (INT REF) Less than 10 nsec avg. Sample Frequency Selectable 48kHz, 44.1kHz, and 32kHz (0.1%) or lock to external reference at 30kHz to 50kHz Digital Audio Level :Selectable OFF, -20 dBFs, -12 dBFs or 0 dBFs Tone : Selectable 1kHz or 400Hz THD : Less than 0.0001% Resolution : 24 bit resolution

ANALOG

Analog Output Standard Left and right 60Ω balanced outputs on 1/4" stereo headphone jacks. Analog Audio Level Selectable OFF, -16 dBu, -8 dBu, or 4 dBu +/- 0.1 dBu Analog Audio Tone 400Hz or 1kHz Selectable +/- 0.01 kHz Noise Better than 80 dBu (20Hz to 20kHz) THD+Noise Better than 0.05%

Batteries 4xAA size Ni-Cad rechargeable 600 mAh. (More than 2 hours of continuous use) Replace with Ni-Cad AA cells only. Charge Time 12-18 hours from full discharge. AC Adaptor 9V DC 500mA DC Adaptor. The adaptor can charge the batteries and supply power to the unit at the same time.

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AND TALLIES

All controls and tallies are located on the front panel of the Audio Bit Spitter.

When the POWER toggle switch is first turned on the unit defaults to: AUDIO LEVEL - OFF SAMPLE RATE - 48kHz TONE

- 1kHz

AUDIO LEVEL

The Bit Spitter generates an AES/EBU digital audio bit stream and stereo analog audio signal simultaneously. The analog signal level tracks the selected digital data level. Selections of -20dBFS (-16dBu), -12 dBFS (-8dBu) and 0dBFS (+4dBu) are made by repeatedly operating the level select switch.

NOTE : The ABS-1 mutes the audio output when the level push button is operated; this allows you to cycle past audio levels without actually outputting high level audio.

SAMPLE RATE

Sampling rate selections may be made for 48K, 44.1K and 32K by operating the sample rate select switch. If it is desirable to synchronize the Bit Spitter to an external reference, select EXT by operating the sample rate select switch. The Bit Spitter is designed to lock to reference signals over the range from 30 to 50kHz. If the external sampling frequency matches 48, 44.1 or 32kHz, the appropriate LED on the front panel will illuminate. The LED in the sample rate select switch will illuminate when the Bit Spitter is locked to the external reference.

AUDIO TONE

Audio tones of 1kHz or 400Hz may be selected by depressing the appropriate pushbutton. When using an external reference, please note that the frequency of the digitally generated tones will be accurate at the "standard" sampling rates of 48, 44.1 and 32kHz. There will be a slight variation in frequency of the tones at "non-standard" sampling rates.

B CHANNEL

In order to easily distinguish between the left and right channels of the stereo signal, the B Channel may be toggled and/or phase inverted with respect to the A Channel or may be turned off completely, by operating the CYCLE, INVERT and OFF buttons respectively.

SEND INVALID

Depressing the INVALID pushbutton sets the validity bit to indicate that the data being sent may not be suitable for conversion.

POWER

The Audio Bit Spitter is powered by four AA Ni-Cad rechargeable batteries or from a 9V, 300 mA AC adapter. The adapter can recharge the batteries and power the unit simultaneously. To replace the batteries, remove the two screws on either side of the housing and carefully slide the assembly from the housing. NOTE: USE Ni-Cad AA CELLS ONLY!

The unit will operate for two hours continuously from a full charge and require eighteen hours to recharge from a full discharge. It is recommended that the batteries are fully discharged before charging to improve battery life and efficiency

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