Dual Directional Microphone
A Dual Directional Microphone, also known as a figure-eight microphone, picks up sound equally from the front and back of the microphone while rejecting sound from the sides. This makes it useful for recording sound from two opposite directions while minimizing sound from other directions. This can be particularly advantageous in situations where you want to capture sound from two sources while minimizing background noise or sound from other sources. For example, a bidirectional microphone might be useful for recording an interview between two people sitting across from each other, or for capturing the sound of a musical instrument with sound coming from both sides.
Advantages of Dual Directional Microphone
Noise reduction
In noisy environments, background noise often
interferes with communication quality, making
communication difficult. The bidirectional microphone
captures the sound of two microphones, combined with a
noise cancellation algorithm, which can effectively
eliminate background noise. In this way, the
user's voice will be clearer and the quality of
communication will be significantly improved.
Echo cancellation
Echo is a common problem in walkie-talkie
communication, especially in two-way communication.
Echo can cause repetition and reverberation of sounds,
affecting the effectiveness of communication.
Bidirectional microphones avoid this problem by
analyzing the signal from both microphones to identify
and eliminate echoes.
Automatic gain control
The intensity of the sound varies from environment to
environment, and if the microphone gain is not set
properly, it can lead to too strong or too weak sound.
The bidirectional microphone automatically adjusts the
gain of the microphone based on ambient noise and
sound intensity, ensuring that the received sound
signal is within the appropriate range and avoiding
sound distortion.
Sound source localization
Bidirectional microphones take advantage of the
difference in position between the two microphones to
determine the direction in which the sound is coming
from. This is essential to distinguish the
speaker's voice from noise in other directions.
Through sound source localization, bidirectional
microphones can better focus on the speaker's
voice, improving the efficiency and accuracy of
communication.
Enhance voice quality
The application of bidirectional microphones in
walkie-talkies can not only reduce noise and eliminate
echoes, but also enhance the quality of calls. With
the use of bidirectional microphones, the
communication effect of the walkie-talkie will be
clearer and more natural, making it easier for users
to communicate.
Why Choose Us
Quality assurance
In terms of quality assurance, the company strictly follows the standards and norms of the industry quality system. Adopt industry-leading testing equipment to ensure product quality and good reputation.
Professional service
We can accept factory inspection and goods inspection at any time. Technical discussion, research and development of new products, and complete after-sales service.
Cheap price
We have a professional purchasing team and costing team, trying to reduce costs and profits, and provide you with a good price.
Oem/odm
When you put forward your needs, our engineers will provide you with faster and more perfect customized solutions. We have a wide range of products, and we will provide technical support according to your actual needs to choose the right product for you.
Types of Dual Directional Microphone
Carbon granule microphones
The working principle of such mics is that the resistance
between two plates( with carbon granules filled in between)
changes when sound waves falls on one of them. The other plate
(rear side) is fixed or stationary. The changing resistance is
converted into changing current when a voltage is applied
across two plates. These type of mics were being used in
mouthpiece of landline phones.
Dynamic mics
In these type of mics, a coil which is attached to a diaphragm
on which sound impinges is placed in a magnetic field. The
sound on falling on diaphragm causes the coil to move around
its steady state position. The coil since it experiences
magnetic flux change develops voltage across its terminals.
This is used for further use(amplification, recording,
processing etc.)
Condenser microphones
In condenser mics, sound falls on one of two plates forming a
parallel plate condenser. This causes the capacity of
condenser to change. This change in capacity is made use of in
developing changing current in accordance with sound falling
on diaphragm.
Piezo electric microphones
Such type of mics make use of piezo electric effect. In piezo
electric crystals, an electric voltage develops across
electrical axis if mechanical pressure is applied across
mechanical axis. In this case sound impinging on diaphragm
causes pressure application across mechanical axis which
produces electric voltage across electrical axis of piezo
electric crystal.
Dual Directional Microphone directivity
Bi-Directional
Bi-Directional microphones pick up sound from only two directions;
from behind and in front of the microphone. This type of
directionality is effective for picking up sound from both an
audience and a speaker. For example, a bi-directional microphone
might be used when holding a press conference where the official
being interviewed, as well as the press's questions, need be
channeled through the same microphone.
Cardioid
Cardioid microphones pick up sound from only one direction; from
in front of the microphone. This means that they are very
effective for interviews or performances in loud places, where
ambient sound needs to be cancelled out in favor of the
interviewee or performer.
Super- and Hyper-Cardioid
These are similar to Cardioid microphones, but do pick up some
sound from behind the microphone as well.
Omni-Directional
These microphones pick up sound from any direction, and are great
for recordings of natural settings, when sound from many different
directions is being recorded at one time.
"Shotgun" Directionality
These microphones were designed to pick up sound primarily from
one direction, but they also pick up some sounds from the sides of
the microphone, as well as from the back. These tend to have a
more linear pick-up pattern.
Application of Dual Directional Microphone
Recording atmosphere
But more generally, a two-way microphone can be used when
you want to capture the atmosphere, for example, in a
recording studio, which sounds better when you want to
record acoustic guitars, percussion, and background sounds
in your recordings.
Close recording
As mentioned earlier, two-way microphones are not affected
by the proximity effects that one-way microphones are
prone to. This is because only one side of the capsule is
open to the air, not both sides. Thus, with a two-way
microphone, you can bring the microphone close to the
source of sound without worrying about the accumulation of
"buzz".
All-round recording
Given that two-way microphones are capable of recording
sound from all directions, two-way microphones are useful
when you want to record sound from two or more locations
around the microphone at the same time. A single two-way
microphone will do the job, provided you're
comfortable with the surrounding sounds it might hear.
Podcast with two participants
If you're a podcaster and only have one microphone, a
two-way microphone is a versatile microphone for
interviewing guests. While you can also use a figure-8
microphone in this case, with a two-way microphone, you
have more flexibility in conducting interviews where you
and your guests can sit down.
Lavalier or lavalier microphone
Lavalier or lavalier microphones tend to be two-way
microphones. This allows them to be placed anywhere on a
person's body and still pick up the sound around the
microphone.
Live recordings
Omnidirectional pickup mode is perfect for situations
where you want to capture all the sounds in the field,
such as in scientific research applications.
Omnidirectional pickup patterns are an excellent choice
for these situations, as they are equally sensitive to
picking up sound coming from wherever they come from.
Components of Dual Directional Microphone
Diaphragm
The diaphragm is a thin, flexible membrane that vibrates in response to sound waves. When sound waves hit the diaphragm, it moves back and forth, causing changes in air pressure.
Capsule
The diaphragm is usually part of a capsule, which also includes a backplate. The diaphragm and backplate form a capacitor that changes its capacitance as the diaphragm moves. This change in capacitance is what produces the electrical signal that represents the sound.
Housing
The capsule is housed in a protective enclosure, which also helps to shape the microphone's frequency response and directional characteristics.
Acoustic port
Some microphones have an acoustic port, which is a small opening that allows sound waves to reach the diaphragm.
Electrical components
Inside the microphone housing, there are electrical components that process the electrical signal generated by the diaphragm and capsule. These components may include amplifiers, transformers, and impedance converters.
Output connector
The output connector is where the electrical signal from the microphone is sent out to be further processed or recorded. Common types of output connectors include xlr, trs, and usb connectors.
Mounting system
Microphones are often attached to stands or mounts for stability and positioning. Some microphones come with shock mounts to reduce handling noise and vibrations.
Windscreen or pop filter
Some microphones come with a windscreen or pop filter to reduce wind noise and plosive sounds (like "p" and "b" sounds) that can distort the audio signal.
How to Maintain Dual Directional Microphone
Properly install and remove the XLR plug
When inserting the XLR plug into the microphone, rotate the plug
so that the upper clasp is aligned with the notch on the
microphone, then push the plug into the microphone until the clasp
key is positioned. Care should also be taken when separating to
avoid damaging the plug or microphone connector.
Keep it dry
Do not place the microphone in a damp place to prevent dust and
dirt from attaching. When the diaphragm is parallel to the
placement plane, the amount of dust falling is larger than that
placed vertically, so pay attention to the storage method.
Clean it regularly
If the microphone's shield cannot be removed, it can be wiped
with a wet wipe. If there is an odor, you can gently scrub it with
a toothbrush dampened with mouthwash, but never spray the
detergent directly onto the head of the microphone.
Avoid plosives
Keep at least 6 inches away from your mouth and microphone to
avoid damage to the microphone by plosives.
How to Choose a Dual Directional Microphone
Directivity
In fact, it is an effective range for the microphone to pick up
sound. It is mainly divided into: Single-directional,
bi-directional and omnidirectional. Single point. It includes
cardioid direction (about 130° in front of the microphone),
supercardioid pattern (about 110° directly in front of the
microphone), and gun direction. Two-pointed. Also known as
figure-8 pointing, the front and rear of the microphone are the
effective pickup areas, which can play a good attenuation effect
on the sound from the side (in layman's terms, it can reduce
the volume or even not). Omnidirectional. It can also be
understood as having no direction, because it is a 360°
all-round sound reception. For example, the microphones on the
bees, headsets, and mobile phones are all omnidirectional.
Frequency of response
It is the frequency range of the microphone reception. Usually the
frequency range that our human ears can hear is 20hz-20khz, which
can be used as a reference.
Frequency response curve
It is the sensitivity of the microphone at each frequency point.
If the curve is straight, it is better to restore the sound.
Self-noise floor
This dynamic microphone doesn't, condenser microphone does,
which means hissing, the smaller the better. 20db down is better.
Signal-to-noise ratio
The simple understanding is that you need a ratio between sound
and noise, the bigger the better. About 60db up is better.
Sensitivity
The volume emitted at the rated voltage or power is generally
taken as the sensitivity at the point of 1khz. The higher the
number, the better.
Bidirectional microphones are one of the simplest methods of creating a directional microphone. A ribbon microphone in its basic form is bidirectional.You have a ribbon of corrugated aluminum with a set of very close magnets at the side of the ribbon. The front and back are exposed to sound waves which create an electrical current.If the sound waves are predominately from the front or back, an electric signal is produced. However, if both sides are energized at the same time such as a signal from top, bottom or sides, the signal is cancelled. because you are combining a positive voltage with a negative voltage. The polar pattern looks much the same as if you put two balloons back to back. I like that description better than the vision of a two dimensional image.Another way to produce a bidirectional microphone is to place two identical cardioid microphone capsules back to back and reverse the polarity of one of the capsules. signal going in the front works, signal going in the back works, but signal hitting both capsules at the same time is cancelled.
Precautions for Using a Dual Directional Microphone
Placement
Position the microphone equidistant from both speakers, with the front and back of the microphone facing each speaker. This ensures that both voices are captured evenly.
Check levels
Monitor the audio levels to ensure that both speakers are coming through clearly. Adjust the microphone gain if necessary to prevent clipping or distortion.
Minimize background noise
Place the microphone away from sources of noise and distractions to ensure a clean audio capture.
Use a pop filter
To reduce plosive sounds like "p" and "t" that can cause distortion in the audio, consider using a pop filter in front of the microphone.
What Are the Trends and Development Directions of Dual Directional Microphone in the Market
Enabling factors
Refer to the reasons why the technology can be adopted. Taking high-quality microphones used in recording studios as an example, the enabling factors of analog technology microphones currently in use are: wide frequency response, large dynamics, high sensitivity, and mature technology. For the recording industry, the pursuit is for high-quality sound, and the enabling factors are the main factors considered by the recording industry. Compared to home recording enthusiasts and podcast users, the first consideration is cost. The enabling factor of analog/digital hybrid technology microphones is their low price. The hot plug function simplifies the operation steps and saves the cost of external sound cards. The sound quality can basically meet their needs. For those who have already purchased analog microphones, adding a USB signal converter can be compatible with the original device. The needs of home recording enthusiasts and podcast users make USB technology microphones popular among this consumer group.
Obstructive factors
Refer to the limits that can be achieved in the technology and the factors that inhibit its acceptance or use. Taking the microphone required for communication equipment as an example, the carbon electrode itself has limited energy conversion effect, so it is quickly replaced by ECM electret type microphones. However, ECM electret type microphones cannot meet the volume requirements of digital communication equipment and cannot directly generate digital pulse signals, so they are replaced by MEMS microphones. Taking USB technology microphones as an example, USB1 The maximum transmission speed of the 0 standard is 1 5Mbps (192kb/s), at this low speed, the digital signal transmission of the microphone is not smooth, so it is unlikely that USB technology microphones will appear, while USB2 The appearance of 0 solves this problem. In addition, the maximum effective transmission distance of USB is 5 meters, which fundamentally determines that USB technology microphones are more suitable for indoor short distance use. In the field of professional audio applications, the existing analog microphone technology in professional recording studios is already very mature, which can well meet the needs of recording engineers. In addition, the preference factors of recording engineers for analog technology microphones make it difficult for digital technology microphones to have a foothold in professional recording studios at this stage. It is worth noting that when the same technology is applied to different industries, the influence of enabling and hindering factors is different. In one industry, enabling factors may take the lead, while in another industry, hindering factors may dominate.
Company Profile
Shenzhen Marquess Electronics Co., Ltd. was founded in July 2004, originating from the Japanese AOI Electric Motor Manufacturing Company as a joint venture specializing in the production of ECM (Electret Condenser Microphones).
Our Certificate
ISO 9001 2015,ISO 14001 2015,ISO 4500 12018,UL E473299,UL E473487
FAQ
Q: What is a directional microphone?
Q: How do directional microphones work?
Q: What is the main axis of a directional microphone?
Q: Why are directional microphones useful?
Q: How do dual-diaphragm microphones work?
Q: What is adaptive directional mode in hearing aids?
Q: Can a directional microphone be used to record two nearby sound sources?
Q: How do directional microphones make it easier for you to hear speech?
Q: What is the pickup pattern of omnidirectional microphones?
Q: What are the benefits of using directional microphones during live performances?
Q: How does proximity effect affect directional microphones?
Q: Can directional microphones be used outdoors?
Q: How are shotgun microphones different from other directional microphones?
Q: What is the role of parabolic microphones in wildlife recordings?
Q: What should you consider when choosing a directional microphone?
Q: When would you use a bidirectional microphone?
Q: What are unidirectional mics good for?
Q: What microphone picks up sound better from one direction?
Q: When would you want to use an omnidirectional mic?
Q: Where does a unidirectional mic pick up sounds?