From: app_rpt-users-bounces@qrvc.com [mailto:app_rpt-users-bounces@qrvc.com] On Behalf Of Ken Leisten Sent: Friday, December 10, 2010 11:38 AM To: Tim Sawyer Cc: app rpt-users Subject: Re: [App_rpt-users] Female voice announce levels
If you read the instructions on the support pages for creating custom voice announcements with the Audacity program, you'll see >that you are instructed to set the final level of the voice file to -6 db before saving it. I assume that this is based on 5Khz >deviation radios. = = = =
This is not right - if you set up for 2.5 kHz deviation, then the loudest sounds will be 2.5 kHz deviation no matter what (assuming you have selected the "limit" option in the config file). As someone else pointed out, that means running the test tone so it gives 1.5 kHz deviation in RADIO TUNE TXVOICE (giving you 2.5 kHz at full blast). The -6dB guideline is just to allow some "headroom". If you have two sources with 0.5 (relative voltage) level, the waveform at times will add up to just 1.0 voltage level and you will stay clear of the limiter. If you have more signals, or higher levels, then you will start hitting the output limiter and things will sound compressed. Without the limiter you will get nasty distortion. Another factor (noted in the instructions) is that if you are using composite audio, the levels for tone and voice must not exceed 1000 in total - or you will get distorted audio, even *with* the limiter enabled. Having said that, the pre-recorded sounds are actually hotter than this guideline. "connected.gsm", for example, hits -3 dB in Audacity as do "version.gsm" and others. The recordings are loud and slow so that you will understand them. But many people would prefer quiet fast ones most of the time. If some person were to record and post an alternative library of the letters, numbers and a few choice words, that would be a useful resource to the user community. Ken KE2N