site_archiver@lists.apple.com Delivered-To: bluetooth-dev@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=radsone-com.20150623.gappssmtp.com; s=20150623; h=mime-version:subject:from:in-reply-to:date:cc:message-id:references :to; bh=8q3YpM2rDvR6xT9udhxEwVRRE0xOv8otDsuQ0FYH2dg=; b=PEbs3LJfnfnpKYlwDyT6JtqTp8leHjHrA+PA/efBLFkv4CDYudCBimzKA5qWyjIztB vWYcgwexA2VA6UuSiGY/R/fPMIrS7pcoX3I9POp5oGUBNXK/9y1SKcu9Lr00h9Zow1Tg kx6yj7PrwSJdamGZmUssiSGM2d6qsa7y93ylnCOs3iesuuGrWEbwpfDZdxL9h4KN2QP4 MsaybL6Pi9T2I98lgxzFdS5TYlKI8cvHa3TtvIKzm2KsfR4te07gOD2Y+HNsiFAUBjw5 lfFVSysne38xLg/kfj9nneA7lBfv9TXrdrCtfTUgCe73/a/gj3rHZAh4iqNiHUbdoG8s ICwQ== Hi Yilok, Yes, iOS supports WideBand voice codec over HFP. But the problem is the voice signal seems to be filtered out with 3.5KHz cut-off, resulting poor narrowband voice quality. Please check airPods with iOS built-in Voice Memos. The recorded sample m4a file has 16KHz sample rate, which means WideBand. But the spectral analysis on it shows just 20Hz ~ 3.5KHz, narrowband voice, no signal from 3.5KHz to 7KHz, that is expected with a WideBand codec. And the same happens with the cellular voice call. Thanks!
On 9 Nov 2018, at 4:55 AM, Yilok Wong <yilok_wong@apple.com> wrote:
Hi Woo-Suk, iOS 12.1 and iPhone 6s supports wideband voice over Bluetooth HFP.
As long as wideband voice is enabled and supported on the network and your two cellular devices, you should see the wideband spectrum over Bluetooth.
Feel free to reach out to me offline if you’d like to debug your setup further.
Yilok
On Nov 2, 2018, at 5:56 AM, Woo-Suk Lee <wslee@radsone.com <mailto:wslee@radsone.com>> wrote:
Again, I’ve run the test with airPod + iPhone 6S iOS 12.1. Using built-in iOS Voice Memos app, I’ve recoded test sample through airPod. The spectral analysis result for the recorded sample is as below. With airPods, the sampling frequency of the recoded sample m4a file is 16KHz, which means the HFP over Bluetooth is using the wide band voice codec. However, the actual voice spectrum only has the narrow band signal, resulting poor voice quality. It seems that the latest iOS has problem in dealing with wide band voice over Bluetooth HFP. I thought it’s a Bluetooth receiver or sink device problem. But after checking with airPods, I think the latest iOS is doing something wrong. As I remember, the older version of iOS doesn’t have the problem. It might be possible the latest iOS just cuts off the signal with the narrow band filter even for the wide band codec. This is a major design flaw. And if anyone experiences the same issue, please post and share the issue so that Apple would fix it shortly. Thanks!
<iOS Voice Rec Bluetooth.jpg>
On 1 Nov 2018, at 1:12 PM, yinweixu <yinweixu@movnow.com <mailto:yinweixu@movnow.com>> wrote:
I may not be able to solve it for you.
------------------ Original ------------------ From: "Woo-Suk Lee"<wslee@radsone.com <mailto:wslee@radsone.com>>; Date: Thu, Nov 1, 2018 12:08 PM To: "yinweixu"<yinweixu@movnow.com <mailto:yinweixu@movnow.com>>; Cc: "bluetooth-dev"<bluetooth-dev@lists.apple.com <mailto:bluetooth-dev@lists.apple.com>>; Subject: Re: iOS Bluetooth HFP speech codec bandwidth
What I mentioned is the generic voice call, not a voip application. It’s just support 8KHz Narrow Band Speech over Bluetooth, even with Apple airPod.
On 1 Nov 2018, at 12:31 PM, yinweixu <yinweixu@movnow.com <mailto:yinweixu@movnow.com>> wrote:
[AVAudioSession.sharedInstance setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionMixWithOthers | AVAudioSessionCategoryOptionAllowBluetooth error:nil]; [AVAudioSession.sharedInstance setMode:AVAudioSessionModeDefault error:nil]; [AVAudioSession.sharedInstance setActive:YES error:nil];
------------------ Original ------------------ From: "Woo-Suk Lee"; Date: 2018年11月1日(星期四) 中午11:07 To: "bluetooth-dev"; Subject: Re: iOS Bluetooth HFP speech codec bandwidth
Hello,
It seems that the latest iOS doesn’t support wide band speech codec over Bluetooth HFP.
As I tested airPod and other Bluetooth headset supporting HFP1.6 wide band speech codec with the test setup below,
airPod or BT receiver —> iOS —> voice call —> Android (Galaxy S8) —> Voice call recording
It just shows the narrow band speech, which has signals over 20~3KHz only.
And the two test setup below show the same result with the full 7KHz bandwidth.
iPhone built-in mic —> iOS —> voice call —> Android (Galaxy S8) —> Voice call recording
BT receiver —> Android(Galaxy S8) —> voice call —> Android (Galaxy S8) —> Voice call recording
It seems the current iOS doesn’t support Wideband Voice Codec over Bluetooth HFP. Anyone exeriencing the same issue?
Thanks!
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