Is external DSP needed for CS4258?

Wynand · 19th July 2006, 09:45 AM

Hi.

I'm looking for a spdif decoder to give me 6 channels.

I found the CS42528 which will be perfect if I don't need a DSP to run it. I see there are connections for a DSP but all I need is the SPDIF decoder, analog outs and the volume control provided with the chip.

I plan on using an ATMEL ATMEGA32 or ATMEGA128 to control it.

An suggestions?

rfbrw · 19th July 2006, 10:19 AM

Quote:

Originally posted by Wynand
Hi.

I'm looking for a spdif decoder to give me 6 channels.

I found the CS42528 which will be perfect if I don't need a DSP to run it. I see there are connections for a DSP but all I need is the SPDIF decoder, analog outs and the volume control provided with the chip.

I plan on using an ATMEL ATMEGA32 or ATMEGA128 to control it.

An suggestions?

You will not need a DSP to run it but you will not be able to use all the dacs at once if you use the internal spdif decoder.

Wynand · 19th July 2006, 10:28 AM

So if I understand correct....

With a DSP i can get 5.1 audio, without it only stereo?

rfbrw · 19th July 2006, 10:36 AM

With a DSP you can get multiple channels and with 3 external SPDIF decoders and some other stuff you can also get multiple channels

Wynand · 19th July 2006, 10:40 AM

I'm looking to get 5.1 sound from the SPDIF out on the motherboard in my PC.

3 x Stereo Channels won't do.

Is there any other solutions to have a look at?

PS do you get audio DSPs or all they all the same?

rfbrw · 19th July 2006, 11:01 AM

Quote:

Originally posted by Wynand
I'm looking to get 5.1 sound from the SPDIF out on the motherboard in my PC.

3 x Stereo Channels won't do.

Is there any other solutions to have a look at?

PS do you get audio DSPs or all they all the same?

Is your MB capable of AC3/DTS over SPDIF. If it is you then need an AC3/DTS decoder. If not, do you have three SPDIF outputs?

Wynand · 19th July 2006, 11:49 AM

Its only got 1 3-pin header on the motherboard.

I'm going to look at the specs online.

It's a P4M800-M7 A motherboard.
Not sure what chips it has on.

Wynand · 19th July 2006, 12:01 PM

It uses a ALC655 chipset.

I'm downloading the datasheet now.

Wynand · 19th July 2006, 12:02 PM

About the AC3/DTS, cant you just send raw PCM over the spdif port?

rfbrw · 19th July 2006, 12:40 PM

Raw decoded data is sent as pairs so 5.1 would need 3 SPDIF pairs. Undecoded multichannel AC3/DTS can be sent over one SPDIF pair.

19th July 2006, 09:45 AM	#1
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Is external DSP needed for CS4258? Hi. I'm looking for a spdif decoder to give me 6 channels. I found the CS42528 which will be perfect if I don't need a DSP to run it. I see there are connections for a DSP but all I need is the SPDIF decoder, analog outs and the volume control provided with the chip. I plan on using an ATMEL ATMEGA32 or ATMEGA128 to control it. An suggestions?

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19th July 2006, 10:28 AM	#3
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	So if I understand correct.... With a DSP i can get 5.1 audio, without it only stereo?

19th July 2006, 10:36 AM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	With a DSP you can get multiple channels and with 3 external SPDIF decoders and some other stuff you can also get multiple channels

19th July 2006, 10:40 AM	#5
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	I'm looking to get 5.1 sound from the SPDIF out on the motherboard in my PC. 3 x Stereo Channels won't do. Is there any other solutions to have a look at? PS do you get audio DSPs or all they all the same?

19th July 2006, 11:49 AM	#7
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Its only got 1 3-pin header on the motherboard. I'm going to look at the specs online. It's a P4M800-M7 A motherboard. Not sure what chips it has on.

19th July 2006, 12:01 PM	#8
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	It uses a ALC655 chipset. I'm downloading the datasheet now.

19th July 2006, 12:02 PM	#9
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	About the AC3/DTS, cant you just send raw PCM over the spdif port?

19th July 2006, 12:40 PM	#10
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Raw decoded data is sent as pairs so 5.1 would need 3 SPDIF pairs. Undecoded multichannel AC3/DTS can be sent over one SPDIF pair.

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