Resampling with SOX about timestampsdr HOT 12 CLOSED

I think the problem is that rtl_fm doesn't support upsampling, only downsampling. There might be a way to achieve that with sox, but your best option is probably to modify this line to use 8000 instead of 48000, and then you can use -s 8k in your rtl_fm command without resampling. If you give that a try let me know if it works, I imagine it should

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I propose to add this parameter (sampleRate) to config.js.

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Yeah that sounds like a good idea, I'll add it in when I get a chance

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Added sampleRate parameter in 03134ca

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Ah, I hadn't thought about this. timestampSDR uses node-wav for creating wav files, and regardless of what input rate you provide, I guess it writes at 44100. I'll look into this more this weekend

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It works! Thank you !

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Hi,
@qualitymanifest I've checked your new code and I feel that something wrong :)
I've changed sampleRate in config.js to 8000 but program saved file with 44100

Can you check please?

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Here some screenshots:

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@kovalroma I was way off, node-wav is definitely not hardcoded to use 44100, it uses the sample rate you provide and I was providing it an undefined sample rate. Whoops! Sorry about that. Anyway I just pushed up a few commits that should fix that, and also added the option to specify channels and bitDepth

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@qualitymanifest hey, still have an issue with default settings.

pi@raspberrypi:~/timestampSDR $ node main.js 
/home/pi/timestampSDR/src/handle_options.js:54
	if (key === "sampleRate" && isNumInvalid({ num: val, min: 1, max: 4_300_000_000, isInt: true, })) {
	                                                                  ^

SyntaxError: Invalid or unexpected token
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:616:28)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/home/pi/timestampSDR/main.js:3:23)

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I think this is incorrect

https://github.com/qualitymanifest/timestampSDR/blob/master/src/handle_options.js#L54

Should be

if (key === "sampleRate" && isNumInvalid({ num: val, min: 1, max: 4300000000, isInt: true, })) {
		return wasInvalid(option, key, "Must be an integer between 1 and 4300000000");

?

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That is using numeric separators, which were apparently introduced in Node 12.5.0 - I thought they had been around for longer than that, this was my first time using them. Since they're just for developer convenience, there's no sense in breaking support for older versions of Node just for that, so I just pushed a commit removing them. Should be good now, let me know if you have any other issues

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