How would a deaf person use a cell phone?
Q. Maybe this is a stupid question, but how would someone who is deaf talk on a cell phone?
And I'm not talking about hard-of-hearing, I mean like someone who hears Nothing.
And this doesn't include texting.
Why in the world would a deaf person need a phone for calling/how would they use it?
And I'm not talking about hard-of-hearing, I mean like someone who hears Nothing.
And this doesn't include texting.
Why in the world would a deaf person need a phone for calling/how would they use it?
A. With a neck loop that plugs into the headphone jack, if they are able to use hearing aids.
Note: Hearing aid needs to have telecoil (t).
Another option is portable tty that connects directly into a cell phone. Any deaf person can use this option, hearing aids or not.
neckloops:
http://www.tecear.com/Neck_loop_ear_hook_guide.htm
portable tty:
http://unitedtty.com/store/product70.html
edit:
There is a myth that has been going around for a long time that implies deafness makes one mute. That myth is complete nonsense too.
Deafness does not mean one can't talk. Deafness does not physically remove a person's voice. Deafness is only an inability to hear, or in some cases .. hear fully.
Deaf who do not talk either never learned to talk, have something unrelated to their deafness that prevents them from talking, or choose not to talk. None of that, however, means they are mute.
Mute is more of a medical term anyways. It is not a term commonly accepted by deaf people, even deaf who choose not to talk.
http://www.agbell.org/
http://deafness.about.com/b/2006/12/17/what-about-mute-people.htm
Oh, and as far as 911 goes. You can still dial 911. You do not even need cell phone service for that. Any cell phone, whether it has service or not can dial 911. Its the law, all cell phones with or without service are required to have that.
Also, if you dial 911 and hang up they will still come. They are required by law to check on all hang ups. They can now triangulate your location from cell phone towers too and newer cells phones do have an e911.
http://en.wikipedia.org/wiki/Enhanced_911
Many places have text to 911 too. My state does not, but many do have that.
http://www.examiner.com/fire-safety-in-national/texting-911
http://www.govtech.com/wireless/Texting-911.html
Note: Hearing aid needs to have telecoil (t).
Another option is portable tty that connects directly into a cell phone. Any deaf person can use this option, hearing aids or not.
neckloops:
http://www.tecear.com/Neck_loop_ear_hook_guide.htm
portable tty:
http://unitedtty.com/store/product70.html
edit:
There is a myth that has been going around for a long time that implies deafness makes one mute. That myth is complete nonsense too.
Deafness does not mean one can't talk. Deafness does not physically remove a person's voice. Deafness is only an inability to hear, or in some cases .. hear fully.
Deaf who do not talk either never learned to talk, have something unrelated to their deafness that prevents them from talking, or choose not to talk. None of that, however, means they are mute.
Mute is more of a medical term anyways. It is not a term commonly accepted by deaf people, even deaf who choose not to talk.
http://www.agbell.org/
http://deafness.about.com/b/2006/12/17/what-about-mute-people.htm
Oh, and as far as 911 goes. You can still dial 911. You do not even need cell phone service for that. Any cell phone, whether it has service or not can dial 911. Its the law, all cell phones with or without service are required to have that.
Also, if you dial 911 and hang up they will still come. They are required by law to check on all hang ups. They can now triangulate your location from cell phone towers too and newer cells phones do have an e911.
http://en.wikipedia.org/wiki/Enhanced_911
Many places have text to 911 too. My state does not, but many do have that.
http://www.examiner.com/fire-safety-in-national/texting-911
http://www.govtech.com/wireless/Texting-911.html
What is the source of echoes in a cell phone?
Q. I asked this in the Consumer Electronics section. No answers. Is the engineering section up to at least offering a hypothesis?
While talking on my cell phone, I sometimes hear my voice echoing back to me a split second later. Makes it dang near impossible to speak.
Today, it happened while speaking to someone in another state. Immediately after that call, I made a call across town, and it was fine.
While talking on my cell phone, I sometimes hear my voice echoing back to me a split second later. Makes it dang near impossible to speak.
Today, it happened while speaking to someone in another state. Immediately after that call, I made a call across town, and it was fine.
A. In landline telephone the source of echoes are from in-balance of the 2wire to 4wire hybrid circuit at the near-end and at the far-end. The phone starts with 4 wire for full duplex, i.e. talk and listen at the same time, versus walkie-talkie mode or PTT. Then a hybrid circuit converts it to 2 wire loop going to the telephone central office (CO). The CO then carries the voice signal in 4 wire thru many COs where it gets converted back to 2 wire loop from CO going to the far-end phone and then back to 4wire to the mike and speaker at the receiver. Why all this 2wire to 4 wire conversion? Because it saves copper wires. As distance is increased the delay gets longer. For example it take 0.5 seconds for a signal to get to the other side if a satellite link is used. If submarine cable is used then it could be as long 0.25 seconds. This is why echo is heard on international calls in landline.
For Cellular to Cellular calls, there is no 2wire to 4wire conversion to cause the echo, however the delay is worst due to voice compression. Note that in landline, phones have slidetones while cellphones have eliminated slidetone. Sidetone is when you hear yourself in the receiver of a landline phone. Your 64 kbps voice (normally for landline) is compressed to around 8 kbps. This cause lots of delay, similar to landline satellite links. On Cellular to landland where there is a 2wire to 4wire conversion then echo should show up due to the large delay.
For Cellular to Cellular where a speaker phone mode is being used at one of the handset, then the cause of echo is acoustic feeback. This is a the same as a mike and speaker in a PA system.
You can experiment this yourself by calling between 2 cellphones and then bring them close to each other. You will hear the delay and can start the echo feedback as you bring the phone very close together. When you switch on the speaker phone mode, this creates the acoustic feedback almost immediately.
BTW, echo suppressors are not used anymore and have been replaced by echo cancellation.
See
http://en.wikipedia.org/wiki/Echo_suppressor
http://en.wikipedia.org/wiki/Acoustic_Echo_Cancelling
for the difference between the two.
For Cellular to Cellular calls, there is no 2wire to 4wire conversion to cause the echo, however the delay is worst due to voice compression. Note that in landline, phones have slidetones while cellphones have eliminated slidetone. Sidetone is when you hear yourself in the receiver of a landline phone. Your 64 kbps voice (normally for landline) is compressed to around 8 kbps. This cause lots of delay, similar to landline satellite links. On Cellular to landland where there is a 2wire to 4wire conversion then echo should show up due to the large delay.
For Cellular to Cellular where a speaker phone mode is being used at one of the handset, then the cause of echo is acoustic feeback. This is a the same as a mike and speaker in a PA system.
You can experiment this yourself by calling between 2 cellphones and then bring them close to each other. You will hear the delay and can start the echo feedback as you bring the phone very close together. When you switch on the speaker phone mode, this creates the acoustic feedback almost immediately.
BTW, echo suppressors are not used anymore and have been replaced by echo cancellation.
See
http://en.wikipedia.org/wiki/Echo_suppressor
http://en.wikipedia.org/wiki/Acoustic_Echo_Cancelling
for the difference between the two.
When people in the US started to use cell phone?
Q. I was wondering when people in the US started to use cell phone? Did they call it a cell phone or hand phone back then? Please inlclude a trustworthy sources/links with your answer if you could. Thank you!
A. When you say "people", I'm thinking you mean the general public. Things started around Chicago (birthplace of Motorola) and walkie talkies in WW2. They only talked between each other. Then the walkie talkies were built to operate by talking thru a mediator (a relay tower). They put multiple relay towers together to carry the 'walkie-talkie' calls and the resulting network became know as cell coverage.
Open this article (http://www.thehistoryof.net/history-of-cell-phones.html) and skip down a few paragraphs to "And the cell phone is born".
Also try:
http://en.wikipedia.org/wiki/Cell_phones#History
The Wireless Industry is restricted by government organizations that control key elements for all that happens now. This government site will have:
1) how things work
2) History
3) Wireless Timeline
4) Glossary of Terms
And they are probably your best source:
http://www.ctia.org/content/index.cfm/AID/10197
Open this article (http://www.thehistoryof.net/history-of-cell-phones.html) and skip down a few paragraphs to "And the cell phone is born".
Also try:
http://en.wikipedia.org/wiki/Cell_phones#History
The Wireless Industry is restricted by government organizations that control key elements for all that happens now. This government site will have:
1) how things work
2) History
3) Wireless Timeline
4) Glossary of Terms
And they are probably your best source:
http://www.ctia.org/content/index.cfm/AID/10197
Powered by Yahoo! Answers
Comments
Post a Comment