Technical Topics > Software
Pitch shift idea
OgreVorbis:
--- Quote from: Stretchyman on July 06, 2018, 1033 UTC ---Just TX a wider B/W, I usually cutoff over 7KHz.
The pitch shifting kinda sounds like a very wierd idea bud!!???
Str.
--- End quote ---
Is the range compromised by that? It would be ideal, but does it have a significant impact on range or is it small enough that it doesn't really matter?
OgreVorbis:
--- Quote from: TheRelayStation on July 06, 2018, 1717 UTC ---a better idea is to have a TX that has full audio range and use a professional sound processor to control, filter and tailor the audio to your specific desires.
obviously, loss of the audio amplitude level is greater at higher audio frequencies which is why (modified) pre-emphasis is used as an industry standard for AM broadcasting.
this is why many SWBC stations generally have their audio frequency set at 5Khz (10Khz total occupied bandwidth), audio density is greater with less bandwidth being used.
--- End quote ---
In terms of sound processing, I'm currently using an ADAU1701 DSP from analog devices. It works really well and I'd highly recommend. The DSP eval board is $200, but you can find Chinese clones of the board for cheaper on aliexpress.
It is controlled by a flow-chart type of software called SigmaStudio. It can be modified in real time to hear the changes to the audio. Cheaper and better than a pro-processor imo.
TheRelayStation:
--- Quote from: OgreVorbis on July 07, 2018, 0038 UTC ---
--- Quote from: TheRelayStation on July 06, 2018, 1717 UTC ---a better idea is to have a TX that has full audio range and use a professional sound processor to control, filter and tailor the audio to your specific desires.
obviously, loss of the audio amplitude level is greater at higher audio frequencies which is why (modified) pre-emphasis is used as an industry standard for AM broadcasting.
this is why many SWBC stations generally have their audio frequency set at 5Khz (10Khz total occupied bandwidth), audio density is greater with less bandwidth being used.
--- End quote ---
In terms of sound processing, I'm currently using an ADAU1701 DSP from analog devices. It works really well and I'd highly recommend. The DSP eval board is $200, but you can find Chinese clones of the board for cheaper on aliexpress.
It is controlled by a flow-chart type of software called SigmaStudio. It can be modified in real time to hear the changes to the audio. Cheaper and better than a pro-processor imo.
--- End quote ---
i use "stereotool", $35 USD it cost.
dont let the name fool you, this software is used on many commercial broadcasting radio stations.
OgreVorbis:
--- Quote from: TheRelayStation on July 08, 2018, 2102 UTC ---
--- Quote from: OgreVorbis on July 07, 2018, 0038 UTC ---
--- Quote from: TheRelayStation on July 06, 2018, 1717 UTC ---a better idea is to have a TX that has full audio range and use a professional sound processor to control, filter and tailor the audio to your specific desires.
obviously, loss of the audio amplitude level is greater at higher audio frequencies which is why (modified) pre-emphasis is used as an industry standard for AM broadcasting.
this is why many SWBC stations generally have their audio frequency set at 5Khz (10Khz total occupied bandwidth), audio density is greater with less bandwidth being used.
--- End quote ---
In terms of sound processing, I'm currently using an ADAU1701 DSP from analog devices. It works really well and I'd highly recommend. The DSP eval board is $200, but you can find Chinese clones of the board for cheaper on aliexpress.
It is controlled by a flow-chart type of software called SigmaStudio. It can be modified in real time to hear the changes to the audio. Cheaper and better than a pro-processor imo.
--- End quote ---
i use "stereotool", $35 USD it cost.
dont let the name fool you, this software is used on many commercial broadcasting radio stations.
--- End quote ---
I've also used that and I like it, but it lags for me sometimes with the virtual cable. I just like the solidness of a DSP - knowing it's not going to lag or fail randomly.
TheRelayStation:
--- Quote from: OgreVorbis ---I've also used that and I like it, but it lags for me sometimes with the virtual cable. I just like the solidness of a DSP - knowing it's not going to lag or fail randomly.
--- End quote ---
what are you using for a virtual cable ?
if you have "stereo mix" in your audio control panel, that is preferred.
i use VAC (hi-fi version) as the default device for playback/recording (so it can be fed into ST) and have zero issues.
make sure all sample rates/bit depths match on all sound cards and on ST.
use WASPI for input/output on ST also.
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