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Harry Chow - Blog

Bluetooth A2DP is widely used for office headsets

Bluetooth is a wireless technology that is most often associated with mono audio headsets used for phone calls. Benefits from A2DP, bluetooth itself is fully capable of carrying a lot more than just phone audio. It is a popular wireless solution for stereo audio devices.

Bluetooth A2DP for office headset

The Advanced Audio Distribution Profile (A2DP) is the technology behind what's popularly known as Bluetooth Stereo Audio. Bluetooth A2DP enables a device such as a smartphone to connect wirelessly to a Bluetooth stereo headset and transmit music or other high quality audio. Normally this technology decodes audio from its native format (such as MP3 or WMV) and transforms it into a format that is more appropriate for Bluetooth's bandwidth. Most Bluetooth Headsets for office today are capable of connecting to A2DP devices and transmitting high quality audio.


Office headset manufacturers have used Bluetooth A2DP in both mono and stereo headsets. In mono headsets, however, the stereo aspects of A2DP aren’t used. Bluetooth stereo office headsets are the most widelyused for office works due to its multifunctionality. These devices can connect to your smartphone or computer to play audio from a music playlist or a movie you’re watching and connect to phone system for normal communication as well. A2DP can also transmit high-quality voice from a microphone, and this application is widely available for office communication requirements.

Publish Date: October 28, 2014 7:53 AM

What is Bluetooth Profiles?

As a bluetooth device (bluetooth office headset and so on), it must be compatible with some subsets of Bluetooth profiles. A Bluetooth profile is a specification regarding an aspect of Bluetooth-based wireless communication between devices. It resides on top of the Bluetooth Core Specification and additional protocols. Bluetooth profile may use certain features of the core specification, but specific versions of profiles are rarely to specify the versions of the core specification. Tanke Hands-Free Profile (HFP) 1.5 for example, it’s compatible with both Bluetooth 2.0 and Bluetooth 1.2 core specifications.

The way a device Bluetooth technology uses depends on its profile capabilities. The profiles provide standards which manufacturers follow to allow devices to use Bluetooth in the intended manner.

At a minimum, each profile specification contains information on the following topics:

  • Dependencies on other formats
  • Suggested user interface formats
  • Specific parts of the Bluetooth protocol stack used by the profile. To perform its task, each profile uses particular options and parameters at each layer of the stack. This may include an outline of the required service record, if appropriate.





Overviews of the different Bluetooth profiles are tabulated below:


Advanced Audio Distribution Profile (A2DP) This Bluetooth profile defines how stereo quality audio can be streamed from a media source to a sink.This Bluetooth profile defines two roles of an audio device: source and sink:


  1. Source (SRC):   A device is the SRC when it acts as a source of a digital audio stream that is delivered to the SNK of the piconet.
  2. Sink (SNK):   A device is the SNK when it acts as a sink of a digital audio stream delivered from the SRC on the same piconet.
Audio/Video Remote Control Profile (AVRCP) This Bluetooth profile provides a standard interface to control audio visual devices including televisions, stereo audio equipment, and the like. It allows a single remote control (or other device) to control all the equipment to which a particular individual has access.The AVRCP Bluetooth profile defines two roles:


  1. Controller:   The controller is normally the remote control device
  2. Target:   As the name suggests, this si the device that is being controlled or targeted and whose characteristics are being altered

This Bluetooth profile protocol specifies the scope of the AV/C Digital Interface Command Set that is to be used. This protocol adopts the AV/C device model and command format for control messages and those messages are transported by the Audio/Video Control Transport Protocol (AVCTP).

When using AVRCP, the controller detects the user action, i.e. button presses, etc and then translates them into the A/V control signal. This control signal is transmitted it to the remote Bluetooth enabled device. In this way, the functions available for a conventional infrared remote controller can be realized over Bluetooth, thereby providing a mode robust form of communications.

Basic Imaging Profile (BIP) This Bluetooth profile details how an imaging device can be remotely controlled, how it may print, and how it can transfer images to a storage device. This Bluetooth profile is naturally intended for cameras and other devices that can take pictures, including mobile phones now.The Basic Image Profile, BIP defines two roles:


  1. Imaging Initiator:   This is the device that initiates this feature.
  2. Imaging Responder:   As the name implies, this si the device that responds to the initiator.

The overall profile may be considered to have the following actions:

  1. Image Push:   This function allows the sending of an image from a device controlled by the user.
  2. Image Pull:   This function within the Bluetooth profile allows browsing nd retrieval of images from a remote device, i.e. pulling images from a remote source.
  3. Advanced Image Printing:   This provides for the printing of images using a number of advanced options.
  4. Automatic Archive:   This function enables the automatic backup of all new images from a target.
  5. Remote Camera:   This function allows the remote control of a camera by an initiator.
  6. Remote Display:   This allows for the Imaging Initiator to push images to another device for display.
Basic Printing Profile (BPP) This Bluetooth profile allows devices to send text, e-mails, v-cards, images or other information to printers based on print jobs.As would be expected te Basic Printing Profile, BPP defines two roles:


  1. Printer:   This is the device that manipulates the data to be printed. Typically this would be a physical printer.
  2. Sender:   This is a device, possible a mobile phone or other form of user equipment, UE, that needs to print some data, but without wanting the full overhead of a print driver.

The advantage of using the Basic Print Profile, BPP rather than the HCRP is that it does not need any printer-specific drivers. This makes it particularly applicable for use with embedded devices such as mobile phones and digital cameras.

Common ISDN Access Profile (CIP) This Bluetooth profile details the way in which ISDN traffic can be transferred via a Bluetooth wireless connection. It is typically used in Bluetooth enabled office equipment that is ISDN enabled.The CIP defines two roles within the Bluetooth profile:


  1. Access Point (AP):   This node is connected to the external network and acts as an endpoint for it. It handles all the interworking associated with the external ISDN
  2. ISDN Client (IC):   This is the remote node accessing the Access Point via the Bluetooth wireless network or link
Cordless Telephony Profile (CTP) This Bluetooth profile defines how a cordless phone can be implemented using Bluetooth. This Bluetooth profile is aimed at use for either a dedicated cordless phone or a mobile phone acting as a cordless phone when close to a CTP enabled base station. The aim of this Bluetooth profile was to allow a mobile phone to use a Bluetooth CTP gateway connected to a landline when within the home or office, and then use the mobile phone network when elsewhere.Two roles are defined within this Bluetooth profile:


  1. Terminal (TL):   This is the user equipment, and may be a cordless phone or a mobile phone, etc.
  2. Gateway (GW):   The gateway acts as the access point for the terminal to the landline or other network.
Dial-Up Network Profile (DUN) This Bluetooth profile details a standard for accessing the Internet and other dial-up services via a Bluetooth system. This may be required when accessing the Internet from a laptop by when using a mobile phone, PDA, etc as a wireless dial-up modem.This user Bluetooth profile defines two roles for the Bluetooth nodes:


  1. Gateway (GW):   This is the Bluetooth node or device that provides the access to the public network and ultimately the Internet.
  2. Data Terminal (DT):   This is the remote node that interfaces with the Gateway via the Bluetooth wireless link.
Fax Profile (FAX) This Bluetooth profile defines how a FAX gateway device can be used. This Bluetooth profile may be needed when a personal computer uses a mobile phone as a FAX gateway to send a FAX.There are two roles for this Bluetooth profile


  1. Gateway (GW):   This is the Bluetooth enabled device that provides facsimile services.
  2. Data Terminal (DT):   This device connects via the Bluetooth wireless link to be able to send its FAX.
File Transfer Profile (FTP) This Bluetooth profile details the way in which folders and files on a server can be browsed by a client device. This Bluetooth profile may be used for transferring files wirelessly between two PCs or laptops, or browsing and retrieving files on a server.Two roles are defined for this Bluetooth profile:


  1. Client:   This is the device that initiates the operation and pushes or pulls the files to or from the server.
  2. Server:   This is the target device and it is remote from the device that pushes or pulls the files.
General Audio/Video Distribution Profile (GAVDP) This Bluetooth profile provides the basis for the A2DP and VDP Bluetooth profiles. These are used for systems designed for distributing video and audio streams using Bluetooth technology. This may be used in a variety of scenarios, e.g. with a set of wireless stereo headphones and a music player – the music player sends messages to the headphones to establish a connection or adjust the stream of music, or vise versa.Two roles are defined within this Bluetooth profile:


  1. Initiator (INT):   This device initiates the signalling procedure.
  2. Acceptor (ACP):   This device responds to the incoming requests from the initiator.
Generic Object Exchange Profile (GOEP) This Bluetooth profile is used to transfer an object from one device to another. One example may be in the exchange of vCards between devices such as mobile phones, PDAs, etc.Two roles are defined within this Bluetooth profile:


  1. Server:   For this Bluetooth profile, this is the device that provides an object exchange server for which data objects can be pushed or pulled.
  2. Client:   This is the device that can pushes or pulls data to and from the server.
Hands-Free Profile (HFP) The HFP Bluetooth profile details the way in which a gateway device may be used to place and receive calls for a hands-free device. This profile adds considerable additional functionality over the original Headset Profile, HSP, allowing remote control, etc. The Bluetooth profile defines two roles:


  1. Audio Gateway (AG):   The audio gateway is normally the mobile phone of car kit and it provides connectivity to the source of the voice data.
  2. Hands-Free Unit (HF):   This is the device which acts as the remote audio input and output mechanism for the Audio Gateway. It also provides some remote control means.

The Handsfree Bluetooth profile uses a CVSD codec for voice transmission cross the Bluetooth link and it also defines a number of voice control features including volume.

Hard Copy Cable Replacement Profile (HCRP) This Bluetooth profile defines how driver-based printing is achieved over a Bluetooth link. As might be expected, it is used for wireless links for printing and scanning.Two roles are defined within this Bluetooth profile:


  1. Server:   This is the server device that offers the HRCP service – typically it is a printer.
  2. Client:   The client is a device containing a print driver on which the client device wishes to print – typically this may be a laptop or other computer wishing to print documents.
Headset Profile (HSP) The Bluetooth Headset Profile details how a Bluetooth enabled headset communicates with a Bluetooth enabled device. As might be anticipated the Bluetooth Headset Profile was aimed at defining how Bluetooth headsets may connect to a mobile phone or installed car kit. It defines two roles:


  1. Audio Gateway:   The device that is the gateway of the audio both for input and output. This would typically be a mobile phone, car kit, or a PC.
  2. Headset:   The Headset is defined within the Bluetooth Headset Profile as the device acting as the remote audio input and output connected to the gateway via the Bluetooth link.
Human Interface Device Profile (HID) This Bluetooth profile details the protocols, procedures and features to be used by Bluetooth keyboards, mice, pointing and gaming devices and remote monitoring devices.Two roles are defined within this Bluetooth profile:


  1. Human Interface Device (HID):   The device providing the human data input and output to and from the host. Typical examples may be a keyboard or a mouse.
  2. Host:   The device using the services of a Human Interface Device. This may typically be a computer or laptop, etc
Intercom Profile (ICP) This profile details the way in which two Bluetooth enabled mobile phones in the same network can communicate directly with each other, i.e. acting as an intercom. As the intercom usage is completely symmetrical, there are no specific roles defined for this Bluetooth profile. However when using the Intercom Profile, the devices at either end of the link will be denoted as a Terminal (TL).
Object Push Profile (OPP) This Bluetooth profile details the roles of a push server and a push client. These roles need to interoperate with the server and client device roles defined within the GOEP Bluetooth profile.The OPP defines two roles:


  1. Push Server:   This is the device within this Bluetooth profile that provides an object exchange server
  2. Push Client:   This device pushes and pulls objects to and from the Push Server and initiates the actions.
Personal Area Networking Profile (PAN) This Bluetooth profile details the way in which two or more Bluetooth enabled devices can form an ad-hoc network. It also details how the same mechanism can be used to access a remote network through a network access point.The PAN is somewhat more complicated than other Bluetooth profiles and requires the definition of three roles:


  1. Network Access Point (NAP) and NAP Service:   In view of the similarities with Ethernet networks, the NAP can be considered as being equivalent an Ethernet bridge to support network services.
  2. Group Ad-hoc Network (GN) and GN Service:   – A Bluetooth device that supports the GN service is able to forward Ethernet packets to each of the Bluetooth devices that are connected within the PAN.
  3. PAN User (PANU) and PANU Service:   As the name indicates the PANU is the Bluetooth device that uses either the NAP or the GN service
Service Discovery Application Profile (SDAP) The SDAP is a Bluetooth profile that describes how an application should use the Service Discovery Procedure, SDP to discover services on a remote device. SDAP can adopt a variety of approaches to managing the device discovery via Inquiry and Inquiry Scan and service discovery via SDP. The ideas contained in the SDAP specification augment the basic specifications provided in GAP, SDP, and the basic processes of device discovery.The SDAP defines two roles as given below:


  1. Local Device (LocDev):   This is the Bluetooth deveice that initiates the service discovery procedure.
  2. Remote Device (RemDev):   There may be one or more RemDevs and these are any device that participates in the service discovery process by responding to the service inquiries it may receive from a LocDev.
Service Port Profile (SPP) This Bluetooth profile details the way in which virtual serial ports may be set up and how two Bluetooth enabled devices may connect.This Bluetooth profile defines two roles for communication to proceed:


  1. Device A:   The Device A is recognised as the device that initiates the formation of a connection to another device. It may also be thought of as the Initiator.
  2. Device B:   This may be thought of as the Acceptor and it is the device that responds to an Initiation process.
Synchronization Profile (SYNC) This Bluetooth profile is used in conjunction with GOEP to enable synchronization of calendar and address information (personal information manager (PIM) items) between Bluetooth enabled devices.There are two main roles within this Bluetooth profile:


  1. IrMC Server:   The device that takes on the role of object exchange server will become the IrMC Server. Typically this device will be the mobile phone, PDA, etc.
  2. IrMC Client:   This device is typically a PC, and it is the device that contains the sync engine and pulls and pushes the PIM data to and from the IrMC server.
Video Distribution Profile (VDP) This Bluetooth profile details how a Bluetooth enabled device is able to stream video over a Bluetooth link. It could be used in a variety of scenarios such as streaming video data from a storage areas such as on a PC to a mobile player, or from a video camera to a television, etc.There are two roles defined within this Bluetooth profile:


  1. Source (SRC):   As the name suggests the SRC is the origination point of the streamed video on the piconet.
  2. Sink (SNK):   Within this Bluetooth profile, the SNK is the destination for the digital video stream on the same piconet as the SRC.


Publish Date: October 20, 2014 9:10 AM


About Noise Cancelling headsets

Noise Cancelling headsets are headsets using active noise control engineering to reduce unwanted background noise. 

Noise cancellation makes it possible to enjoy music or hear important information without volume raising excessively. Noise cancelling headsets increase the signal-to-noise ratio significantly more than passive noise attenuating headsets or no headsets, making hearing important information such as safety announcements easier. It helps a passenger sleep in a noisy vehicle and an airliner. Noise-cancelling headsets can improve listening enough to completely offset the effect of a distracting concurrent activity.

Noise-cancelling headsets use active noise control to cancel the lower-frequency portions of the noise; they depend on more traditional methods such as soundproofing to prevent higher-frequency noise from reaching the ear. This approach is preferred because it reduces the demand for complicated electronic circuitry that would be required for noise cancellation at higher frequencies, where active cancellation is less effective. To truly cancel high frequency components (coming at the ear from all directions), the sensor and emitter for the cancelling waveform would have to be adjacent to the user’s eardrum, which is not currently technically feasible.


By the 1950s, systems were created to cancel the noise in helicopter and airplane cockpits. Noise-cancelling aviation headsets are now commonly available.

Currently, most noise-cancelling headsets use analogue technology. This is in contrast to other forms of active noise and vibration control in which digital processing is the standard method.

A number of airlines provide noise-cancelling headsets in their business and first class cabins. Noise cancelling is particularly effective against airplane engine noise. In these cases, the headsets are about the same size as normal headsets. The electronics, located in the plane handset, take the sound from the microphone behind the headset, invert it, and add it back into the audio signal, which reduces background noise.

Benefits and Limitations

Circumaural headsets enclose the wearer’s ear completely. This provides passive noise isolation so that electronic noise cancellation circuitry can perform better.
Noise-cancelling headsets can reduce extraneous noise significantly, but have some limitations (depending on model):

They are more expensive than regular headsets.
They consume power, usually supplied by a USB port or a battery that must occasionally be replaced or recharged. Without power, some models are unable even to function as regular headsets.
The noise-cancelling circuitry required for them to operate may reduce audio quality and introduce some high-frequency hiss. However this limitation may be offset by reductions in external noises that would otherwise reduce audio quality.
Models can be bulkier and/or heavier than regular headsets to incorporate batteries and electronics.
They may make some individuals queasy.

Publish Date: October 3, 2014 4:00 AM

What is headset amplifier for call center?

call center headset amplifierHeadset Amplifier is an adapter that connect headset with ordinary telephone or digital telephone. Usually, headsets are
directly connected to the telephone. But it can not ensure the quality of the voice because headsets are not matching the
ordinary telephone.

Amplifier can provide users with some practical function that ordinary phones rarely provide with. Such as the microphone
mute, phone handle or headset switcher, communication status indication, the microphone sensitivity adjustment, etc. But
whether the amplifier will be used mainly depends on your business requirements.

The call center headsets can substitute the traditional telephone handle for voice communication. If your telephone has
no RJ – 09 interface for headset support, it can only be plugged into the handle interface. But if you also need to use
the telephone handle at the same time, you need to choose headset amplifier (adapter). Through the adapter you can switch
between the headset and handle. In the meantime you also can adjust the volume of the voice.

Publish Date: September 28, 2014 3:30 AM

Why Computer Headsets can not supersede Call Center Headsets?

Communications business headsets always are mono headsets, because the call center work is different from daily entertainment. In the daily entertainment,we pay attention to sound effect with two ears so that we can enjoy the perfect sound effect from the music. The call center headsets are totally different. What it needs is only to support clear calls and it’s more strict to the clarity of sound without any sound level requirements. So the economic and portable single ear headset appears.

Contace Center Headset

Call center headsets are designed for single ear. The most important reason is considering comfort level. According to the requirement of long time use for operator, two ear headsets obviously can’t provide good comfort. Wearing ears will make people feel discomfort due to long-term depression. In addition, according to scientific research, if two ears has always accept the phone voice (for example, students do listening exercises) for a long time, the efficiency will significantly get lower after a period of time. listening with attention would easily get tired. It will gradually cause hearing damage.

So after many scientists’ researches, many communication products companies introduced single ear headsets instead of traditional double ear headsets for professional purposes.

In addition, noise reduction microphones are adopted for the call center headsets while other type of headsets are for the music effect and will not use noise reduction microphones.Besides, because the impedance of PCs or media players headsets is not match telephone, it’s will cause voice distortion problems.

When ordinary headphone connected to the call center system, the effect of the call, durability and comfort will be more different with the professional call center headsets . The quality of speakers and microphone determines the quality of the headsets. The impedance of the professional call center headset is usually in the range of 150 ohms to 300 ohms while mobile communications headset is 32 European – 60 ohms.


If you use the headphones that technical parameters do not match your telephone system, the effect of the voice will become weak and you can not talk clearly. Headsets’ design and the selection of the material determines its durability and comfort for people. if the design of connecting parts is not reasonable or it’s assembled bad, its service life will be short. This will increase your maintenance costs. At the same time, it will seriously affect the work efficiency and service quality.

Call center headsets are an integration of headset and microphone. It is different from ordinary headsets. Ordinary headsets usually are stereo while call center headsets are mono due to the voice transmission design. One of its features is the narrow band width for voice frequency design. Electret microphone will stably work with light weight and high durability. Computer headsets are stereo. If they are used for telephone, it will cause tinnitus and dizziness, physical discomfort. It’ will harm your health for long time use. 

Actually using professional communications headsets is very beneficial to your health. People often carry phone handle in the neck. It is easily cause spinal deformation and muscle damage.

Call center headset is a product of human and will free human’s hands and will help improve the work efficiency. Also, call center, office environment can significantly shorten the duration of a single call and increase the unit time for calls. It will improve the company’s image either. Get people hands free and communicate easily.

Call center headsets’ wearing and adjustment method is not difficult. Firstly wear a headset. Then appropriately adjust the position of head clamp and the T shape plate. Make it pressure on the skull instead of on the ears. Adjust the angle of the headsets, smoothly make the it on the ears. Turn the mic boom (be careful not to force around the built-in stop point) then make the mic boom to the cheek extension 2 cm to the front of the lower lip.

Publish Date: September 26, 2014 8:25 AM


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