Winbond ISD1700 Voice Recorder

[ams0178]

Hey Guys,

I'm getting close but I'm not quite there. I have the audio chip recording and playing because the LED is constant during recording and blinks during playing. But unfortunately I'm not getting anything out of the speaker except a small hum. I've documented my setup of what I'm doing below. I'm a little bit unfamiliar with audio signals so its certainly possible that I might be doing something wrong.

I'm using the audio in pin which has a 0.1uF cap on it as recommended in the datasheet. Once powered up in SPI mode, the ISD17000 should assumes that the audio input is from this pin and not the microphone, (If I read the design guide correctly). I'm trying to put a simple audio output signal from my PC tower into this pin. I cut off the end of a wire that has an audio jack on the one end. There was a red wire and a white wire inside that I stripped down to the wire. I tested the output audio signals with an oscilloscope and they're between +/- 1 Volt. I didn't think it mattered which wire I soldered to the audio input pin on my board because as far as I know audio is just a differential signal, right? But currently the white wire is soldered to the input pin. And I tied the red wire to ground. I even monitored the input signals here as I recorded them and saw the input on the oscilloscope. But when I go to play back the recording, the speaker just hums as if there was only a very faint sound.

Does anybody know what I'm doing wrong? Any suggestions for troubleshooting? I'm not sure what to check next.

Thanks, Alan

[ams0178]

Well I actually figured out 2 things. 1) The analog input is not a factory default. Bit 6 of the APC register should be cleared to use the analog input. 2) If you enable the visual LED aid during recording or playing and do a read status command without the LED bit enabled, the LED will stop even if it continues to read or write. Learned that lesson in about 5 hours earlier today.

Alan

[Ioannis]

Have a look at this:

http://www.4dsystems.com.au/prod.php?id=73

Almost unlimited messages!

Ioannis

[spolk10]

Hey Guys,

I'm getting close but I'm not quite there. I have the audio chip recording and playing because the LED is constant during recording and blinks during playing. But unfortunately I'm not getting anything out of the speaker except a small hum. I've documented my setup of what I'm doing below. I'm a little bit unfamiliar with audio signals so its certainly possible that I might be doing something wrong.

I'm using the audio in pin which has a 0.1uF cap on it as recommended in the datasheet. Once powered up in SPI mode, the ISD17000 should assumes that the audio input is from this pin and not the microphone, (If I read the design guide correctly). I'm trying to put a simple audio output signal from my PC tower into this pin. I cut off the end of a wire that has an audio jack on the one end. There was a red wire and a white wire inside that I stripped down to the wire. I tested the output audio signals with an oscilloscope and they're between +/- 1 Volt. I didn't think it mattered which wire I soldered to the audio input pin on my board because as far as I know audio is just a differential signal, right? But currently the white wire is soldered to the input pin. And I tied the red wire to ground. I even monitored the input signals here as I recorded them and saw the input on the oscilloscope. But when I go to play back the recording, the speaker just hums as if there was only a very faint sound.

Does anybody know what I'm doing wrong? Any suggestions for troubleshooting? I'm not sure what to check next.

Thanks, Alan

Alan,
I am having the same problem. What did you do to fix this?
Scott