November 2018 - Bluetooth-dev

Re: iOS Bluetooth HFP speech codec bandwidth
by Woo-Suk Lee 08 Nov '18

08 Nov '18

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)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(a)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(a)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(a)movnow.com >>> <mailto:yinweixu@movnow.com>> wrote: >>> >>> I may not be able to solve it for you. >>> >>> >>> ------------------ Original ------------------ >>> From: "Woo-Suk Lee"<wslee(a)radsone.com <mailto:wslee@radsone.com>>; >>> Date: Thu, Nov 1, 2018 12:08 PM >>> To: "yinweixu"<yinweixu(a)movnow.com <mailto:yinweixu@movnow.com>>; >>> Cc: "bluetooth-dev"<bluetooth-dev(a)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(a)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! >>> >>> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com >> <mailto:Bluetooth-dev@lists.apple.com>) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/bluetooth-dev/yilok_wong%40apple.com >> <https://lists.apple.com/mailman/options/bluetooth-dev/yilok_wong%40apple.com> >> >> This email sent to yilok_wong(a)apple.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Re: iOS Bluetooth HFP speech codec bandwidth
by Woo-Suk Lee 08 Nov '18

08 Nov '18

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)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=KxazuKB8aE/d1pV70GC7W7RmQi3cT0kYM5e2EmJTLfc=; b=knMDL0ikH6t+8Gvq9hZJ30njl4aR7ZrN2XWh3flXGgzx6lXxiHh0DI0+buWxRCenF9 ZjWHJwIK/p/1fVHWBHaZ/cnIxgNalukO++DUiMo1SZWiz4734WEOLKNv41IY789U74u+ DpkrRPWIo0gmjrEs9TAphXHi7dh3+WUOSpoPQuHg6PhsVALmCkCGNfH4dngCjHor08WE w7qtU5oiJHpgNC1mtuaX6ol0GV/AEckkdtxP4G+8fLb9A/s9VxlwqzDcOQA8Un+aipf1 D7oWauUzsQL4xMQZ4JUTybMI+UiPZokBbqAdFRbaNpSv04lMQZsJEwZzb3Tx+uHaOfcQ losA== Hi Yilok, Yes, iOS support wideband voice codec over BT HFP. The sample rate is 16KHz. But if you check the actual voice contents, it’s filtered by 3.5KHz cut-off. No signal in 3.5KHz ~ 7KHz, that is expected with wideband speech codec. The physical link is opened with the wideband standard, bu the actual voice is all filtered out, providing just poor narrowband voice quality. You can check easily with iOS voice memos app. Record your voice through airPods or any BT headset with Voice Memos. The recorded voice sample m4a file, it has 16KHz sample rate, which represent wideband. But the spectral analysis on it shows no signal from 3.5KHz to 7KHz. All filtered out. > On 9 Nov 2018, at 4:55 AM, Yilok Wong <yilok_wong(a)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(a)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(a)movnow.com >>> <mailto:yinweixu@movnow.com>> wrote: >>> >>> I may not be able to solve it for you. >>> >>> >>> ------------------ Original ------------------ >>> From: "Woo-Suk Lee"<wslee(a)radsone.com <mailto:wslee@radsone.com>>; >>> Date: Thu, Nov 1, 2018 12:08 PM >>> To: "yinweixu"<yinweixu(a)movnow.com <mailto:yinweixu@movnow.com>>; >>> Cc: "bluetooth-dev"<bluetooth-dev(a)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(a)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! >>> >>> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com >> <mailto:Bluetooth-dev@lists.apple.com>) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/bluetooth-dev/yilok_wong%40apple.com >> <https://lists.apple.com/mailman/options/bluetooth-dev/yilok_wong%40apple.com> >> >> This email sent to yilok_wong(a)apple.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Re: iOS Bluetooth HFP speech codec bandwidth
by Yilok Wong 08 Nov '18

08 Nov '18

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com 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(a)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(a)movnow.com >> <mailto:yinweixu@movnow.com>> wrote: >> >> I may not be able to solve it for you. >> >> >> ------------------ Original ------------------ >> From: "Woo-Suk Lee"<wslee(a)radsone.com <mailto:wslee@radsone.com>>; >> Date: Thu, Nov 1, 2018 12:08 PM >> To: "yinweixu"<yinweixu(a)movnow.com <mailto:yinweixu@movnow.com>>; >> Cc: "bluetooth-dev"<bluetooth-dev(a)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(a)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! >> >> > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/yilok_wong%40apple.com > > This email sent to yilok_wong(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Re: iOS Bluetooth HFP speech codec bandwidth
by Woo-Suk Lee 02 Nov '18

02 Nov '18

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)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=PG+deYM1VQRFh1sB6lC+t9+m0/Fg3J5eRqDtYD5ryio=; b=fj/MaW/PwOyKq5cluglOoWh8KLz6ZiWQh0n6a6avXI9gY98IFiDgeTSyNtxz0yCyx+ Se4DME7rIqJcJ3VjG/g4pOOPZMBfRwU6jdUoPpTDdtXKPqw/C6FJRxQQfJCXFhpBYfJC sPr2Jqsob6aesAvBsB5XKFgyl0vA77T+zjorYzgJaTQTBX6eLdnhfa78X3nVv6GnYSCP ytahBpa2CKY/WgD1dVeIItDSE2v71ySF5a7OF2TPrftZ8zosSpVIRd/8PNjT5QpDwFmc uA7Sijez2E8QiCnkzOORmRE6ifiJgwhpSApenYIW4r6qS4kzgBkeAwAfIemN0DGW/J1o mNCw== _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Re: iOS Bluetooth HFP speech codec bandwidth
by Woo-Suk Lee 01 Nov '18

01 Nov '18

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)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=xNNf/0C93n2oTs9fSSk7rmJUQlbnMILu3c7Enk2s82s=; b=IhgwKW51SIgTUQtrcCI7T62aCLKom08r/5XO2fJjdEQpEpHRZU2SZCtnSIu6pzhkx7 q6hGYYsJ7fB1Dra1t8w4HBi+i/v0TCM2dNp1w/6wYk7ULXsGEZlMbMPUFWWNWNTGMmAA mslwbUheWAi65CO21W0fusXqPOQHmz6c0P6M8XxC2YyJ36la0Y410uChCPuXvL6+mcWo OaIxtmqi9U1NBxf0UwizC8Aj+pSI9lb51a95RTKvzC/+bGav69SIiSOBbCraG8dA430h zcmFqD9rZRkOg1d6z24jhYTbbkgtj4eFRE6KRbFchuy2MAMiC7ZEBFGAGRnl/8APr0fl zTRw== 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(a)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! _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Re: iOS Bluetooth HFP speech codec bandwidth
by yinweixu 01 Nov '18

01 Nov '18

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Feedback-id: bizmailfree:movnow.com:qybgforeign:qybgforeign4 [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! _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Re: iOS Bluetooth HFP speech codec bandwidth
by Woo-Suk Lee 01 Nov '18

01 Nov '18

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=radsone-com.20150623.gappssmtp.com; s=20150623; h=from:mime-version:subject:date:references:to:in-reply-to:message-id; bh=rir3I8H1hpj4Pelb6klWHCt0MCPPOREcHFMlU66Ht3w=; b=WsmyppunAuAgNJmgQdRkyowfYtMkUGT4WKfPT5q8YQBL8XK/VhZc/5TiothoN3Gwzn AWAT4me8bIqsJb0koyZlO8hZw0FoI6xakdHCOhhyUbr3lggmwDeqB4fvIz+2bXTz3PsQ bm8G4gnDna4cOnviysWjFoU/mJ8awe9pg1Yybzxbi/IbQs5n9dKwef55EK1yL1jutSi7 S6bKusKOIDSRUi+GW0HO33roKzqkmRsu/v3pIKgvUY+TASNdFYvR2sNBqnSaq7QwTtO0 HtaGu8eNLhFJKgjv09FGq56D6FyyGKnimHg/cDr79GGea1jlDSzJbp6jRfNjOPsYpOpj fHXQ== 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! _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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