VSDSP Forum

Thank you for the analysis. It makes sense now.

Migrating to the VS1063 may be an option for us (though, of course, I would have hoped for a software fix).
So thanks for also checking this on the VS1063.

Regards,
Thiadmer Riemersma

We are using the VS1053B for audio decoding. One of our customers streams audio in MP2 format (MPEG-1 layer 2). We have enabled layer 1/2 support in the SCI_MODE register. We also use the most recent patches (version 2.9). We have observed noise on top of the signal, when playing back MP2. We have o...

Hello Pasi & Henrik,

Thanks. I hadn't taken asynchronous clocks into account. It is clear now.

Regards,
Thiadmer Riemersma

Hello VLSI, In the datasheet of the VS1053, it is explained that the maximum SPI speed for SCI reads is CLKI/7 (see the note at the bottom of page 23 of version 1.31 of the datasheet). The rationale is that: tWL, tWH, tH each take 2 samples (minimum) and tV requires 25ns. Therefore tWL + tWH + tH + ...

Hello Pasi,

A 1.5dB resolution is fine. Thank you for your help.

Hello everyone, We need a kind of volume "normalization" of different tracks, which basically amounts to compressor/limiter functions. Now, the VS1053 (which is what we are using) offers gain control and a VU meter, which is basically what we need. However, the granularity of the VU meter ...

Hello Panu, The crystal is 12.288MHz. It is multiplied by 3.5 in the PLL (the CLOCKF is set to 0x8800). The device is at a customer's site. However, when talking to another customer, he mentioned having observed a similar thing (although he recollected that the speed/pitch were significantly too hig...

Hello everyone, I have received a report from a customer that our device, that has the VS1053, started playing at double the speed and double the pitch at some point. The device had played normally for days. The MP3 track in question had also played correctly in the days before. The track format is ...

Hello everybody, But I do have a follow-up question: since fine-tuning the crystal frequency is "user code", no wait period is given for that in the datasheet. The application note does not list it either. Is that information available? The above refers to the application note "VS1053...

Hello everyone, Is it advisable to just send SCI commands regardless of whether DREQ is high or low, and use a delay after each command (as given in section 9.6 in the datasheet)? I changed my code to do as I wrote in the quoted remark: just send commands, without checking DREQ. After the command, I...