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In the Forum: Didital Things
In the Thread: The Museatex Bidat pages.
Post Subject: Teac vrds 10se specsPosted by Telstar on: 4/11/2008
 Romy the Cat wrote:

Yep, Telstar. The 1547 was use in Sony and Teac CD players and believe the first CD-SACD machines used that chip. I know very little about those chips and have none of my personal experience to deal with all of it. The reasons why I brought it up because Bidat used this processor but the IDAT does not and according to the people who apparently read the IDAT manual it said that it used the “less expensive processor”. I have no idea what it all means…


Thank you for the answer.

I think it referred to the DAC chip. The TDA1547 is not listed in the specs. According to a dac chip list site i saw, the 1547 was the premium chip of that series and probably was more expensive.

 Romy the Cat wrote:

And here are the specification for Bidat (BTW, my unit has 5.9VRMS at output)

Digital filtering: 8X over sampling, DSP based "Intelligent" design.
Frequency Response: 20 Hz to 20 Khz +0, -0.5 dB.
Total Harmonic Distortion + Noise: -90dB
Jitter: Less than 10 PS. No periodic jitter. Crystal based PLL clock recovery system.
Inter channel difference (dB level/Ratio): 0.10 dB or better.
Noise, optical and electrical inputs (30 KHz BW): Less than 90 dB.
Inputs: ST glass optical, TOSlink optical (EIA), 75 Ohm coaxial, AES/EBU broadcast standard (XLR).
Outputs: Balanced stereo pair (XLR) 600 Ohms. Unbalanced pair (RCA) 300 Ohms.
Output Level: 3.5Volts RMS (Maximum)
C-Lock™ anti-jitter input receiver with digitally activated oscillator control.
Dual transformers.
Four layer printed circuit board.
16 to 20 bit digital audio word input.
IDAT™ interpolation algorithm.
Combination 7350/1547 single bit output.


And here are the (scarce) specifications from my Teac:
Frequency Response: 20 Hz to 20 Khz +-0.3 dB.
Signal to noise Ratio: Better than 110dV (1 khz)
Dynamic Range: Better than 99 dB (1 khz)
Harmonic distortion: 0.0013% (1 khz)
Wow and Flutter: Unmeasurable (Quartz accuracy)*
Channel Separation: Better than 110 dB (1 khz)
Output: Analog 2,2 V rms, Digital 0,5 Vp **
D/A Converter: "Bitstream" conversion (Double differential operation)
Digital Filter: 8-times oversampling, 20-bit digital filter**
Analog Filter: 3rd order Butterworth filter

* I think this has been improved with much modern clocks.
** digital output is very low, I dont like this. But i havent replaced the clock and output yet with Tentlabs stuff, which should improve it.
*** the 8x oversampling is part of the TDA1547 architecture.

What's really different, besides AC and capacitors is the DSP. Meitner IDAT algorithm makes a difference for sure. Also, I dont know if it uses any digital and analog filters, the lack of may improve sound transparency.

Anyway, these news on the Bidat made me try to push the limits of my old good teac player Smile

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