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Forum Index : Electronics : TV sound
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palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1873 |
I normally hang out on the Micro-controller forum, but have a question probably more related to electronics. A friend has a fairly new OLED TV it is a Samsung and I am not familiar with the set up. The TV comes with a black box? and a remote with almost no buttons and no instruction book. I do know you can talk to the TV and ask it to change channels. However the problem is he has an older amplifier and surround sound system with AV analogue input and the TV black box only has optical out, so I bought an Optical to analogue converter, hooked it up and it worked OK. The next day he rang to say it stopped working so I had a look and could find nothing wrong. Just as I was leaving it burst into life, I asked him what he did and he said he changed channels. So we found there were a few channels that did not work with the surround but most did. So why? do they need re-tuning or do some channels transmit different sound. He is happy with the way it is working but I am curious. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
The channels it doesn't work on may be the hd channels??? That may need it's setting changed for them possibly......just a guess. Cheers Caveman Mark Off grid eastern Melb |
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Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
You are not pushing the mute button on the left side of the remote by chance? The remote does not have many buttons but is very powerful when you work out how to use it with the on screen cursor. The Samsung TV I have will also recognise your finger as a pointer if you point upwards. Also the power switch moves up, down, left and right and allows you to change channels etc if you need to. The TV should have come with a manual but if you go to Samsungs website you should have no problem downloading it. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
Those TOSLINK optical to analog converter boxes are not as great as they claim to be on the box. It would seem that different A/V streams can have different codec's for the audio part(just like the video part), and if the optical-RCA box does not support a certain codec, you simply get nothing. I have seen that before with the ones you can get from Jaycar. They work very well with two-channel stereo such as bog standard PCM, but if you feed them 5.1 or 7.1 surround or DTS or something like that, they just go into mute cos they don't support decoding that audio stream - not even as a downmix to bog standard two channel stereo. It's a bit of a bugger, really. On one TV that this was happening on, I was able to set the TV set optical out to two-channel stereo PCM, and that seemed to fix the problem, as the TV itself would downmix anything surround before it squirted it out the optical socket. If your TV set does not allow you to set the optical output format or otherwise select a mixdown option, you're probably stuffed. These days, most modern TV's DON'T let you do that, as they assume that if you are using the optical output at all, you will be piping it into an HT receiver amplifier, and it will have the required decoding board for all the fancy audio formats. Smoke makes things work. When the smoke gets out, it stops! |
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yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
I had the same problem with the digital output from a JVC DVD player into a marantz amp. The signal through the orange coded coax would only work when the audio output on the DVD player was set to PCM with some DVD's others worked fine in full surround sound. Originally I thought it was a copyright protection thing but I suspect the JVC box is not outputting the audio correctly for some reason. Fortunately it died so I binned it quick. I'm confused, no wait... maybe I'm not... |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
The more 'Standard' way to do it, is from each device to the amp, and the 'Monitor Out' HDMI socket up to the TV set. You can also connect all your things to the TV set's HDMI sockets, and use the HDMI socket with the ARC(audio return channel) - if it has one - to connect back to the amp. Then the TV selected the device, and streams the audio back to the amp. There are various setups, but I have found that I hardly EVER use TOSLINK/Optical link for anything anymore, as all your A/V is on the one HDMI cable, and so many things now are setup for HDMI. Hell, you can even get an HDMI audio-extractor, and that seems to work better then the TOSLINK ones if you just need basic analog stereo out from the HDMI stream. Technology is wonderful when it's all working right!  Smoke makes things work. When the smoke gets out, it stops! |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1873 |
@ Grogster As I said above it is only a few channels the racing channel 78 was one of them, then channel 9 has 4 channels and one of them has no sound when using the converter the others are OK. The first thing I looked for was HDMI but the TV itself has no connections except the 'One Connect' which is an optical cable from the black box that comes with the set and the black box only has HDMI in and the optical out. It is no big deal the guy is happy with what he has, I was just curious as to why. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2914 |
GDay Paul, The Racing channel (Ch 78) is an MPEG4 channel what other channels do not work properly? What model is the TV? it is possible the MPER4 encoding may to blame. Kind Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1873 |
@BigMik I was thinking it maybe had something to do with MPEG3 & MPEG4 I will see what channels they are, is there anywhere I can find which channels send MPEG4. I know that channel 9 which is 5 here has no sound but 51, 52, and 53 the other '9' channels have sound. Paul "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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