ISD 1790 recording problem

[kahbee]

Hi everyone. I'm doing a project on the ISD 1790 using SPI interface. I have no problem on the SPI command which means I can play the recorded clips after sending 0x40 into ISD1790. However, when I want to record a sound clip by sending 0x41, I could not record any sound clip. The sound clip I can hear is just noise. For information, I am connecting mic into ISD1790. Is it the problem? As in the datasheet, the circuit suggested is using analog input. Actually, what is analog input? Please help... thank you in advance.

[kahbee]

i can do it ady. hardware problem. anyway, thanks

[kahbee]

actually, may i know what is analog input? there is a pin for analog input for ISD1790. is it an input for the headset with pic connected?

[PCM programmer]

Look at their block diagram here:
http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ConsumerElectronicsIC/ISDVoiceIC/ISDChipCorder/Pages/default.aspx
They suggest that it's for background music.

It can also be used as a Line Input (mono) pin. You can connect some
other audio source (CD player, DVD player, a Radio, etc.) to the Ana In
pin and record that audio instead of the Mic input. Or you can mix it
with the Mic input in various ways.

[kahbee]

I now connect the analog input to my pc and play audio with it. However, I fail to record any sound. I'm sending spi command to set it as analog input only. But, it cannot work. However, if I use mic, it works fine.
p/s: I have mic as well as analog input connected. I doubt the APC register does not run. How to set it?

[PCM programmer]