guolema
Auditioning
- Joined
- Oct 30, 2017
- Messages
- 1
- Real Name
- lema
I like movies, this forum make me feel excited because I can solve some problems in my project.
As a hobby project I'm building an audio amplifier. It'll be the amp for my "home theater". I only have a small room so there's no room for 5.1 speakers. And honestly I don't care for 5.1. So I want just a small stereo system with a mono subwoofer, or as they call it, a "2.1" system.
I have decent speakers, (Yamaha NS-50F pair, rated at 80W), and a subwoofer I built myself. Testing has shown that an LM3886 (68W max @ 4 ohms) is more than enough to drive it. So I went ahead and built a simple, triple amplifier.
The results were disappointing. Not even remotely enough "bass". So I built a small "bass boost" circuit (more like a "treble cut" and raise the volume). It was a lot better. But I missed the EQ.
I would like to build an EQ. An analog one would be relatively simple to build with a bunch of opamps. I want this controlled by a remote control so I'd have to replace the pots with digipots. But it starts getting complex, as I'd need:
So I thought of just using a DSP. I'm more or less familiar with these as I've played with FIR and IIR filters in the past. Building an audio EQ and output multiplexer (stereo to 2.1) with a DSP would make things a LOT easier, less noisier and overall (in my opinion), better. Well, except maybe for ADC-DSP-DAC delay.
Is there a solution that has:
Seems so far the only realistic option is to just use an audio CODEC and a 32-bit microcontroller such as STM32F4.
Thanks all guys.
As a hobby project I'm building an audio amplifier. It'll be the amp for my "home theater". I only have a small room so there's no room for 5.1 speakers. And honestly I don't care for 5.1. So I want just a small stereo system with a mono subwoofer, or as they call it, a "2.1" system.
I have decent speakers, (Yamaha NS-50F pair, rated at 80W), and a subwoofer I built myself. Testing has shown that an LM3886 (68W max @ 4 ohms) is more than enough to drive it. So I went ahead and built a simple, triple amplifier.
The results were disappointing. Not even remotely enough "bass". So I built a small "bass boost" circuit (more like a "treble cut" and raise the volume). It was a lot better. But I missed the EQ.
I would like to build an EQ. An analog one would be relatively simple to build with a bunch of opamps. I want this controlled by a remote control so I'd have to replace the pots with digipots. But it starts getting complex, as I'd need:
- Input stage/buffering
- Equalizer
- Low-pass filter for sub
- Output preamp (LM3886 needs to be driven relatively high)
So I thought of just using a DSP. I'm more or less familiar with these as I've played with FIR and IIR filters in the past. Building an audio EQ and output multiplexer (stereo to 2.1) with a DSP would make things a LOT easier, less noisier and overall (in my opinion), better. Well, except maybe for ADC-DSP-DAC delay.
Is there a solution that has:
- High quality (high SNR, low distortion) ADC with at least 24bit/96khz
- At least 32-bit DSP core (floating point prefered?)
- High quality (SNR, dist) DAC.
- FREE development tools, or at least, unrestricted trial versions.
- Comes in an easy to manually solder package (not QFN or BGA. QFP is fine)
- Extra inputs such as S/PDIF, I2S, etc. And multiple analog input channels (to save on the input multiplexer).
- It's available as a cheap "ebay board"
Seems so far the only realistic option is to just use an audio CODEC and a 32-bit microcontroller such as STM32F4.
Thanks all guys.