question: How can people on the phone not hear themselves when on speaker?
comment: Speaking as someone who answers phones for a living, I do hear it. It’s awful when people call me on speakerphone/from their car.
passages: Half-duplex speakerphones only allow sound to travel in one direction at a time, either: 1) into the speakerphone from the telephone line and out of its internal speaker to its user, or 2) from its user, into the microphone, and out through the telephone line. While the users of the speakerphone are speaking, the phone only transmits sound to the telephone line; its internal speaker is cut off and no sound arriving from the telephone line can be heard by the user. While the user of the speakerphone is quiet, the speakerphone only receives sound from the telephone line and its internal speaker broadcasts that sound to its user. There is a very definite, noticeable switching action each time the phone "changes directions" and a cough or other transient noise in the room may interrupt incoming sound from the far end of the telephone connection.
   Some users of the iPhone 4S reported the random appearance of echoes during phone calls made with earphones in the initial release of iOS 5. The other party in the call was sometimes unable to hear the conversation due to this problem.
  
  Section::::Reception.
   These acoustic technologies must also remove or reduce the noise levels so that the caller is well understood. A person making a call from a handsfree device who is in a busy restaurant or while driving will introduce large levels of noise into the call. This situation is complicated as the software must not only remove the noise around him, but must transmit his voice clearly and loudly to whoever is connected to him. 
   TADs with digital storage for the recorded messages do not show this delay, of course.
  
  Section::::Pure voice operation.:Remote control.
  
  A TAD may offer a remote control facility, whereby the answerphone owner can ring the home number and, by entering a code on the remote telephone's keypad, can listen to recorded messages, or delete them, even when away from home.
   In addition, many computer software vendors and telephony operators provide softphone application software that emulates a telephone by use of an attached microphone and audio headset, or loud speaker.
   The electromagnetic (telecoil) mode is usually more effective than the acoustic method. This is mainly because the microphone is often automatically switched off when the hearing aid is operating in telecoil mode, so background noise is not amplified. Since there is an electronic connection to the phone, the sound is clearer and distortion is less likely. But in order for this to work, the phone has to be hearing-aid compatible. More technically, the phone's speaker has to have a voice coil that generates a relatively strong electromagnetic field. Speakers with strong voice coils are more expensive and require more energy than the tiny ones used in many modern telephones; phones with the small low-power speakers cannot couple electromagnetically with the telecoil in the hearing aid, so the hearing aid must then switch to acoustic mode. Also, many mobile phones emit high levels of electromagnetic noise that creates audible static in the hearing aid when the telecoil is used. A workaround that resolves this issue on many mobile phones is to plug a wired (not Bluetooth) headset into the mobile phone; with the headset placed near the hearing aid the phone can be held far enough away to attenuate the static. Another method is to use a "neckloop" (which is like a portable, around-the-neck induction loop), and plug the neckloop directly into the standard audio jack (headphones jack) of a smartphone (or laptop, or stereo, etc.). Then, with the hearing aids' telecoil turned on (usually a button to press), the sound will travel directly from the phone, through the neckloop and into the hearing aids' telecoils.
   There are strong concerns that the ever-listening microphone of smart speakers presents a perfect candidate for a wiretap. In 2017, British security researcher Mark Barnes showed that pre-2017 Echos have exposed pins that allow for a compromised OS to be booted.
  
  Section::::Privacy concerns.:Voice assistance vs privacy.
   Apple's own headset has a multipurpose button near the microphone that can play or pause music, skip tracks, and answer or end phone calls without touching the iPhone. Some third-party headsets designed for the iPhone also include the microphone and control button. The current headsets also provide volume controls, which are only compatible with more recent models. A fourth ring in the audio jack carries this extra information.
   Rarely will a telepresence system provide such a transparent implementation with such comprehensive and convincing stimuli that the user perceives no differences from actual presence. But the user may set aside such differences, depending on the application.
  
  The fairly simple telephone achieves a limited form of telepresence using just the human sensory element of hearing, in that users consider themselves to be "talking to each other" rather than talking to the telephone itself.
   Full-duplex speakerphones are able to transmit and receive simultaneously and there is no discernible change of transmission direction. These phones are much more complicated and often employ sophisticated digital signal processing algorithms to sort out the incoming sound and the sound in the room for echo cancellation. Their cost is also higher than for a half-duplex speakerphone.
  
  Section::::Speakerphone setup.
   Along with the microphone and speaker, additional circuitry is incorporated to prevent the incoming speaker signal and the outgoing microphone signal from interfering with each other. This is accomplished through a hybrid coil (A3). The incoming audio signal passes through a resistor (A8) and the primary winding of the coil (A3) which passes it to the speaker (A1). Since the current path A8 – A3 has a far lower impedance than the microphone (A2), virtually all of the incoming signal passes through it and bypasses the microphone.
   On the bottom of the iPhone, there is a speaker to the left of the dock connector and a microphone to the right. There is an additional loudspeaker above the screen that serves as an earpiece during phone calls. The iPhone 4 includes an additional microphone at the top of the unit for noise cancellation, and switches the placement of the microphone and speaker on the base on the unit—the speaker is on the right. Volume controls are located on the left side of all iPhone models and as a slider in the iPod application.
   Section::::Recording.
   BULLET::::- David Castaneda: lighting
  
  BULLET::::- Nikolay Levin: sets
  
  BULLET::::- Deb O: costumes
  
  BULLET::::- Gwen Orel: dramaturg
  
  BULLET::::- Matthew Tennie: projection
  
  BULLET::::- Seth Bedford: music
  
  BULLET::::- Peculiar Works Project: archival video
  
  BULLET::::- Ryan Holsopple: sound
  
  BULLET::::- Marte Johanne Ekhoougen: props
  
  BULLET::::- Cathy Carlton: production associate/swing actor
  
  Set and light crew included: Christoper Hurt, Janet Bryant, Dror Shnayer, Diana Byrne, Tricia Byrne, and Skip LaPlante.
  
  Section::::Production details.:Theatrical runs.:Details of 2010 theatrical run.:Cast (in order of speaking).
  
  BULLET::::- Ben Kopit: Frank, Bill
  
  BULLET::::- Derek Jamison: Davis, ensemble
  
  BULLET::::- Catherine Porter: Ann, ensemble
  
  BULLET::::- Christopher Hurt: Wardell, ensemble
  
  BULLET::::- Ken Glickfield: Sam, Congressman Bagehot
   Many modern speakerphones must first be calibrated to the acoustic characteristics of the room in which they will be used. During this calibration phase, they may make a variety of noises including ascending tones or chiming sounds. This calibration may be automatic or manually invoked by the user, and it may need to be repeated if the speakerphone is relocated within the room. A failure to be properly calibrated can be indicated by the occurrence of echoing, ringing sounds, or feedback.
  
  Section::::Handset vs. base speakerphone.
   Digital switches encode the speech going on, in 8,000 time slices per second. At each time slice, a digital PCM representation of the tone is made. The digits are then sent to the receiving end of the line, where the reverse process occurs, to produce the sound for the receiving phone. In other words, when someone uses a telephone, the speaker's voice is "encoded" then reconstructed for the person on the other end. The speaker's voice is delayed in the process by a small fraction of one second — it is not "live", it is reconstructed — delayed only minutely.
   BULLET::::- Marisha Wagner – alto
  
  BULLET::::- Cindy Wagner – alto
  
  BULLET::::- Adam Bastien – tenor
  
  BULLET::::- Brian Robison – tenor
  
  BULLET::::- Todd Fertig – tenor
  
  BULLET::::- Kyle Cooper – tenor
  
  BULLET::::- Matthew Seckman – tenor
  
  BULLET::::- Dustin Whitney – tenor
  
  Musicians (Lovesponge Quartet)
  
  BULLET::::- David Davidson, David Angell – violin
  
  BULLET::::- Kristin Wilkinson – viola
  
  BULLET::::- John Catchings – cello
  
  BULLET::::- Trish Price – melotron ("One More Round")
  
  BULLET::::- Otto Price – programming, guitars, jazz drums, accordion, synthesizer and miscellanea
  
  Production
  
  BULLET::::- Otto Price – executive producer, producer, programming, additional programming, A&R direction, engineer, vocal arrangements
   Since handsfree devices replace a phone's own speaker and microphone capability in a phone call, they now also must deal with the same issues that standard mobile phones and land phones deal with. The main acoustic issues are echo cancellation and noise suppression, although there are others as well. There have been many ways developed to cancel echo in phone calls and results range from poor to excellent. 
   Modern mobile phones use a multi-microphone design to cancel out ambient noise from the speech signal. Software is used to subtract the sound captured by the microphone(s) placed furthest from the mouth, from the microphone closest to the mouth, which produces a much clearer speech quality.
  
  Section::::Active vs. passive noise control.
   Section::::Earwitness memory.:Verbal memory: voice recognition.:Direct hearing vs. devices.
  
  Whilst many earwitness accounts are attained directly and 'in-the-moment', many will be acquired over a telephone or over other communication devices. Whether the earwitness hears a conversation or other auditory information in person or hears it over a communication device could impact their rate of accuracy. However, contrary to this prediction, research has found no significant differences between the accuracy of voice identification when the voice was heard directly or over a mobile phone, despite the sound quality seeming poorer in the latter.
  
  Section::::Earwitness memory.:Verbal memory: voice recognition.:Emotion.
   BULLET::::- Poughkeepsie "Sunday Courier" (May 3, 1931): "If a certain crusading congressman could have seen last night's production he would have probably branded the whole company as dangerous, if not Red agitators."
   BULLET::::- Carrie McCrossen: John, ensemble
  
  BULLET::::- Tonya Canada: Doscher, Harriet
  
  BULLET::::- Rebecca Servon: Rose, ensemble
  
  BULLET::::- Mick Hilgers: Drdla, ensemble
  
  BULLET::::- Patricia Drozda: Purcell, ensemble
  
  BULLET::::- Sarah Elizondo: Hilda, ensemble
  
  Section::::Production details.:Theatrical runs.:Details of 2010 theatrical run.:Orchestra.
  
  BULLET::::- Aaron Dai: piano
  
  BULLET::::- Brian Mark: clarinet
  
  BULLET::::- Samuel C. Nedel: bass
  
  Section::::Production details.:Reviews.
  
  Section::::Production details.:Reviews.:1930s Reviews.
  
  Flanagan's changes (cited under "Differences," above) are reflected in critical responses in the press:
   Similar to Voice Carry Over Telephone (VCO), The Internet Protocol (IP) Relay Service is used by Deaf or Hard of Hearing people can use the phone, but sometimes they cannot hear and don’t understand voices on the phone. IP relay is accessible through the internet and allows the person to communicate by text. When an user calls someone, there is a third party person, called a communication assistant (CA), who will receive the user’s call and the IP relay will go from the caller’s computer to the other person’s phone. The communication assistant will type to the deaf/hard of hearing person, who will in turn respond, and then the communication assistant will pass along the information to the person on the other end of the line.
   A problem with recording a telephone conversation is that the recorded volume of the two speakers may be very different. A simple tap will have this problem. An in-ear microphone, while involving an additional distorting step by converting the electrical signal to sound and back again, in practice gives better-matched volume. Dedicated, and relatively expensive, telephone recording equipment equalizes the sound at both ends from a direct tap much better.
  
  Section::::Methods.:Location data.
   When activated, the sound from the amplifier is reproduced by the speaker in the talk box and directed through the tube into the performer's mouth. The shape of the mouth filters the sound, with the modified sound being picked up by the microphone. The shape of the mouth changes the harmonic content of the sound in the same way it affects the harmonic content generated by the vocal folds when speaking.
  
presuppositions: People on the phone cannot hear themselves on speaker. People on the phone cannot hear themselves on speaker.
corrections: People on the phone can hear themselves on speaker. It's possible for people on the phone to hear themselves on speaker.
raw_presuppositions: People on the phone cannot hear themselves on speaker. People on the phone cannot hear themselves on speaker.
raw_corrections: People on the phone can hear themselves on speaker. It's possible for people on the phone to hear themselves on speaker.