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IHD Ltd, Hong Kong (2026)

30/09/2022

CASE REVIEW: HYATT REGENCY NINGBO HANGZHOU BAY

Opened on February 1, 2021, Hyatt Regency Hangzhou Bay is the first international high-end brand hotel to open in Ningbo Qianwan New Area. Located just about 10 minutes' drive from Hangzhou Bay National Wetland Park, the hotel is a unique urban oasis. As an emerging and dynamic social hub in the Hangzhou Bay Economic Development New Area, Hyatt Regency Ningbo Hangzhou Bay will provide guests with a fresh and energetic experience of the unique charm of Hangzhou Bay.

ihD began designing all of Hyatt Regency Hangzhou Bay's intelligent systems and audiovisual acoustics in 2017 and completed testing and acceptance of all systems in January 2021.

INTERNAL APPRECIATION
The design of the hotel's lobby lounge incorporates botanical gardens and light and shadow, fresh and elegant colors, scenery and light intertwined and jumping.

The hotel has a total of 319 modern rooms and suites, spread over floors 3-22. All rooms are equipped with panoramic floor-to-ceiling windows with open views.

The hotel has four restaurants and bars offering the ultimate in delicious cuisine.
With 13 private dining rooms and an open hall, Enjoy Yue Chinese Restaurant features local Ningbo flavours, specialty small seafood, Cantonese classics and signature delicacies – Hyatt Old Beijing Fruit Wood Roast Duck.
The café, which incorporates the concept of "morning market" and the open-ended kitchen, offers a wide range of buffet and a la carte menus for all guests.

With a total area of 3,042 square meters of versatile venues, the hotel offers flexible spaces to cater to a wide range of events. Ideal for business meetings, wedding receptions and social events.

The hotel features a heated indoor pool and a 24-hour fitness center.

Author: Bobby Bao, Editor: Joanne Yang

16/09/2022

SOUND REINFORCEMENT SYSTEM DESIGN FOR THE 1,000-PERSON LECTURE HALL

In the last issue, we mainly introduced the acoustic design of the 1000-person lecture hall. When the acoustic indicators such as noise and reverberation parameters in the lecture hall meet the requirements, supplemented by professional sound reinforcement system design, the indoor layout of the sound reinforcement equipment is located through computer software (such as EASE) environmental model, and finally the professional audio engineer adjusts the relevant parameters of the audio processor, which must achieve the expected effect.

DESIGN GOALS
SOUND REINFORCEMENT SYSTEM DESIGN INDICATORS
• Ensure that the sound reinforcement system in the auditorium meets the following indicators (level 1): Maximum sound pressure level: M103 dB
• The transmission frequency characteristics are 0dB with an average sound pressure level of 100Hz to 6300Hz, and the allowable range in this frequency band is -4dB to +4dB; Permissible range of 50Hz to 100Hz and 6300Hz to 12500Hz
• Sound gain: the average value of 125~6300Hz is greater than or equal to -8dB;
• Steady-state sound field inhomogeny: less than or equal to 6dB at 1KHz, less than or equal to 8dB at 4KHz
• Language Transmission Index (STIPA): >0.5
• Total system noise level: NR-20

SOUND REINFORCEMENT EQUIPMENT SELECTION
1. SELECTION AND ARRANGEMENT OF LOUDSPEAKERS
The selection and arrangement of the loudspeaker will eventually affect the sound quality effect of the lecture hall, and when designing and planning, in addition to meeting the acoustic design indicators required by the specification, it is also necessary to meet the loudness, uniformity, clarity and fullness of the audience seats during language reinforcement; Requirements for fullness, brightness and sense of direction (panorama positioning) during music reinforcement; Speech should be able to achieve clear language, no distortion, sufficient sound pressure margin, uniform distribution of sound field, silent feedback whistle, large dynamic range, bass, midrange strength, high pitch clear and bright without hair, sound and image positioning is correct.
• Line array loudspeakers: Set up line array loudspeakers hanging and installing on the left and right sides of the stage front as the main expansion, effectively covering the audience area
• Rear-field sound cabinet: In order to ensure the uniformity of the entire venue sound field, while considering the sound field coverage of the middle and rear areas, wall-mounted sound cabinets are configured on both sides of the lecture hall and the back field as a supplement to the main amplifier;
• Pull audio loudspeakers: set on both sides of the front of the stage. They are mainly used for front area sound filling, and at the same time have the effect of "moving down" the sound image of the loudspeaker system above the stage, that is, pulling the sound image.
• Listening loudspeakers: according to the needs of the performance to set up the use of loudspeakers, they provide live listening for stage actors. Flow landing, flexible use.
• Subwoofer loudspeakers: Set up low-frequency loudspeakers under the left and right sides of the stage to supplement the low-frequency effect of the venue. Can provide a good low-frequency off-line expansion, high sound pressure, to ensure the real low-frequency effect under high power.

2. PICKUP: According to the use scenario of the lecture hall, the pickup equipment is equipped with wireless headsets, wireless handheld microphones, wireless gooseneck, wired desktop microphones, which can be used to meet the needs of different application.

3. MIXER: The mixer selects the mainstream brand digital mixer in the market and adjusts the parameters through the intuitive colour touch screen or rotary encoder. Commonly-used functions can also be adjusted via the buttons. Configured with 32 mixing channels (24 lines/amplifiers + 6 lines + 1 USB stereo) and 16 output channels as required. With 24 Class A amplifiers, all output channels have 1/3 octave diagram equalization and 6-segment parametric equalization, as well as limiter, delay, and 12-band notch filters; 14 mono mixes, which can be turned into stereo sound directly to in-ear monitoring; 6 stereo effects plus pitch correction effects. Support mainstream network audio protocols Dante, Q-sys, etc., more than 120 preset parameters of live instruments, microphones, and audio sources; The operator can quickly call according to the needs of the scene, which greatly reduces the operation difficulty of the operator.

4. AUDIO PROCESSOR: The audio processor is the "heart" of the entire sound reinforcement system, as the "glue" between the signal input device and the output device, and will play an important role in the entire audio link. It is used to improve the audio signal and make existing equipment get better results; Completely open programming architecture, supporting third-party central control management platform for remote control.

5. POWER AMPLIFIER: To better co-operate with the full-frequency array loudspeaker module and the line array subwoofer, according to the model and number of loudspeakers, the system is equipped with 2 high frequency linear array loudspeaker amplifiers, 4 sets of low-frequency line array loudspeaker amplifiers, and 2 sets of line array ultra-low frequency loudspeaker amplifiers.

CONCLUSION

The design and planning of the sound reinforcement system should also fully consider the compatibility of the system to meet the needs of different application scenarios. The configuration and selection of audio equipment must also be stable in performance, reliable in quality, simple in control, easy to use, and compatible with the more mainstream audio network transmission protocols on the market, which is convenient for subsequent upgrades and expansions.

Author: Marvin Wang, Editor: Joanne Yang

09/09/2022

ACOUSTIC DESIGN OF A 1,000-PERSON LECTURE HALL

The design of a one thousand People Lecture Hall involves many aspects: in the aspects of sound, light, electricity, fire protection, etc., it is necessary to do a good job of reasonable planning and design to ensure that the lecture hall can be guaranteed in many aspects such as function and safety.
The first thing to consider in the design scheme is the acoustic design, and other aspects of the design and planning should be done with the acoustic design scheme as much as possible, which can well ensure the sound field environment of the space. If the sound field environment of the space is satisfied, there will be no echo, multiple echo, vibrating echo, sound focus and other problems, and the lecture hall can be used normally.

CASE SHARING

Take one of the projects we are implementing as an example: The lecture hall is divided into two floors, the whole lecture hall is shaped in a fan-shaped structure, the maximum depth in the longitudinal direction is about 30m, the maximum width in the horizontal is about 24m, and the height of the floor is 9.5m. The seats in the lecture hall are stepped, and the maximum number of seats can reach 913. It is usually used to undertake various conferences and special academic reports, and can also meet the needs of small recreational activities and studio activities. In practical applications, language reinforcement is the mainstay.

ACOUSTIC DESIGN SCHEME

DESIGN STEPS
• Determine the appropriate reverberation time standard according to the volume and function of the room;
• According to the layout of the room, it is recommended to choose the surface materials of the fine decoration of each area;
• Use software to build three-dimensional models, add acoustic materials to each surface, and test various indicators.

1. DETERMINE THE REVERBERATION TIME
According to the requirements of GB 50356-2005 of the Code for acoustic design of theaters, cinemas and multi-purpose halls, the area of this report hall is 1353 square meters, and the volume is about 14000m³. The full reverberation time requirement for 500Hz-1000Hz should be 1.1s-1.5s.

2. REASONABLY DETERMINE THE SURFACE MATERIAL
According to the architectural layout of the lecture hall, in order to make the sound pressure level of each row of audience areas more uniform, the following suggestions are made in the acoustics of the building:
• Audience area rear wall and seating area: mainly strong sound absorption, sound absorption mainly takes into account the middle and high frequency segments, the material is fabric sound absorption or wood perforated board material is appropriate.
• Audience area side wall and stage side wall: sound absorption takes into account the diffusion, sound absorption mainly takes into account the low and medium frequency bands, can be used in the form of convex and concave to increase the surface, and spaced as a diffusion sound absorber of sound absorption inserts.
• Ceiling in the audience area: sound absorption and diffusion, it is advisable to use a perforated arc diffusion plate. The angle setting of the diffuser plate needs to consider the selection and placement of the audio and video professional speakers, and the overall principle is to make the reflected sound formed by each sound source reaching the diffuser plate more evenly sent to the audience area, especially the audience area in the middle and rear rows where the direct sound is weak.

3. 3D MODELING, SIMULATION SOFTWARE COMPOSITE
• According to the dimensional information of the proposed planar profile drawing, a 3D model is built with CAD or SU
• Import the EASE software
• Add sound-absorbing materials (wall materials, ceiling materials, floor materials, seat materials) in the material library If there is no material in the library, it can also be created and added according to the sound absorption coefficient of the material to be used.
• Audio and video professional can also set the model and installation position and angle of the speaker in the setting speaker library, and set the listening point or listening surface.
• Various parameters required for the simulation (reverberation time, direct sound Direct SPL, total sound pressure level Total SPL, language clarity STI, etc.).

CONCLUSION

Each space has its own acoustic properties, and size, shape, furniture, and physical materials combine to define the sound representation within the space. The more reflective surfaces in space, the more vivid and echoing the sound becomes. The larger the space and the longer the acoustic path, the more delays it causes, resulting in more speech intelligibility issues. If these acoustic problems are ignored, in the subsequent construction of the sound reinforcement system, even if it is expensive to choose high-end sound reinforcement system equipment to make up for the acoustic impact caused by the construction, electromechanical and interior hardware, it may not be able to achieve the effect we expect. Therefore, for the sound reinforcement construction of large venues, the early professional acoustic design and planning is particularly important.

Author: Willian Jiang, Lee Li; Editor: Joanne Yang

19/08/2022

INTELLIGENT HEALTH MANAGEMENT SYSTEM FOR SMART HOME

With the acceleration of the development of the smart home industry, people are pursuing more and more convenient lifestyles, and the requirements for the quality of life are getting higher and higher, and the health problems of the home environment have become more and more of a topic of concern. An intelligent health management system was born.

In the design of smart homes, the intelligent health management system is also an important part of the content, mainly including the following aspects:

AIR SYSTEM
Air-quality sensor real-time monitoring of environmental PM2.5, formaldehyde, carbon monoxide, temperature and humidity and other environmental data, when the monitoring of an environmental index exceeds the standard, that is, with the air purifier and other smart home equipment linkage, the air purifier can be automatically opened, self-purifying indoor air. When the temperature exceeds the set index, it can be linked to intelligent home appliances such as air conditioners for indoor heating. If the humidity exceeds the standard, it can be linked to the intelligent dehumidifier for dehumidification.

WATER SYSTEM
Add a water-purification sensor to the home water purifier, which can detect the data of total organic carbon, chemical oxygen demand and turbidity in the water for 24 hours, and feedback to the mobile APP and central control in real time to ensure the health of water.
Install water-leakage detectors in areas prone to water leakage (kitchen, bathroom), and automatically close the water valve when a leak is detected.

INTELLIGENT HEALTH MONITORING SYSTEM
The system can link intelligent health devices such as blood glucose meter, blood pressure meter, body fat scale, sleep belt and electric toothbrush to collect physical signs data.

INTELLIGENT HEALTH MANAGEMENT PLATFORM
Through the intelligent central control screen, you can monitor and view indoor temperature, humidity, CO concentration, PM2.5 concentration and other data in real time, and you can also use the mobile terminal to achieve remote control.
The health management system uses local or cloud storage of all the user's test records and environmental data, big data long-term analysis of indicator trends, abnormal indicators the first time to warn users.

Recently, many of the projects we have implemented have also included intelligent health management systems, and some problems in the design are worth paying attention to.

ISSUES TO FOCUS ON IN DESIGN
1. The measured data needs to be analyzed in depth;
2. There are many data acquisition equipment, the collection is cumbersome, and the multi-functional monitoring equipment of the unified standard should be used;
3. The platform and system should be deeply linked.

Author: Ming Ma, Editor: Joanne Yang

05/08/2022

THE APPLICATION OF IOT IN SMART BUILDINGS

Internet of Things IOT, or Internet of Things. It is the use of various information sensing equipment, through the computer Internet for automatic identification of items and the interconnection and sharing of information, to achieve the connection, management and control of things and things, things and people, all items and networks, to create a low-carbon, intelligent, safe and efficient application scenario for smart cities, smart parks and smart communities.

IOT'S DEVELOPMENT OPPORTUNITIES IN SMART BUILDINGS

In the development of intelligent buildings, various strong and weak current systems have brought various conveniences to buildings and users, but also brought a lot of troubles:

• There are many types of various systems, the equipment is complex, and there is no unified communication protocol and interface; Fragmented, unable to manage and monitor uniformly; System maintenance and management personnel are exhausted and unable to understand the operating status of the equipment on time.
• Do not know how to show the efficient operation of the building to the company's management;
• Do not know what standard process to use to collect data from the facility;
• Do not know the personnel and occupancy rate of the building, do not know how to deal with and deal with the danger in the event of a hazard;
• How to avoid conflicts during the booking of meeting rooms;
• What is the reason for the high energy consumption of buildings?
Smart buildings need to be constantly developed, so intelligent buildings based on the Internet of Things platform have emerged. Coupled with the accelerating global commercialization of low-power WIDE networks such as NB-Iot, eMTC, Lora, etc., the rapid growth of the Internet of Things platform and the rapid improvement of service support capabilities have provided new development opportunities for the Internet of Things to land in smart buildings.

EXAMPLES OF IOT APPLICATIONS IN SMART BUILDINGS
In smart buildings, the Internet of Things has been widely used in various scenarios, such as: parking lots, toilets, shopping malls, large event sites, conference rooms, etc.

PARKING LOT
People can not only book visit times, areas and parking spaces through the platform, but also get indoor navigation of the parking lot, and by viewing the three-dimensional view, whether it is a parking lot, lobby, elevator or office building interior, they can easily obtain more convenient path PLANNING
The lights in the basement parking lot can provide a guidance function, and after the IoT lamps read the vehicle entry gate information through the system, the lights guide the vehicle to park in the most suitable vacancy through the change.

TOILET
• Users can book toilets through the APP to monitor bathroom cleanliness, air conditions, hand sanitizer and tissue usage in real time.
• Emergency alarm, flood alarm, satisfaction evaluation and other functions in case of emergency.

MALL

• Customers can experience no queuing, automatic tracking of shopping carts, calculation of fees by automatically scanning the QR code of goods, and mobile payment and departure; At the same time, the shopping mall background can count the sales of goods in real time, issue replenishment notices in time, and suggest the shelves of related new products.
• Smart buildings can determine the identity of personnel, automatically plan, and open the corresponding area permissions of different groups of people. For example, automatically identifying the customer's shopping route, pushing the latest products and preferential information of neighboring stores; You can also push similar stores and products according to the store that the customer enters and the choice to try on and try on the products, and inform the customer of the planned route and inform the relevant preferential information.
• Through big data analysis of crowd behavior, smart buildings not only accurately plan and market the business circle, but also analyze and warn the crowds at large-scale activities to avoid crowding, let people work with peace of mind, and at the same time, the business circle plays the greatest value.

Author: Vivian Wu, Editor: Joanne Yang

29/07/2022

SOUND INSULATION DESIGN OF THE DOOR

The sound insulation of the door has always been an important part of sound insulation. The door is a sound insulation short board compared to the wall, and the overall sound insulation of a wall with a door depends on the amount of sound insulation of the door (acoustic short board effect). Doors are needed for every location: hotels, homes, conferences, recording studios, etc. Especially in the hotel, the sound insulation of the guest room entrance door is often related to the sound insulation of the corridor, if the sound insulation of the entrance door is not done well, guests can obviously hear the sound of the corridor, which has a great impact on the rest and sleep of the guests.

DOOR INSULATION IS A COMMON PROBLEM
1. The sealing strip at the bottom of the door is not popped out or not bounced to the end, resulting in a gap at the bottom of the door, and the sound will be transmitted from the gap so that the sound insulation effect cannot be achieved.
2. The structural problem of the door; the thickness of the wooden door itself is not enough; There is a cavity in the center of the wooden door, and the material inside the door leaf is the door core or low-cost materials such as honeycomb board and MDF.
3. There is a gap between the door leaf and the door cover, the door leaf and the threshold, and the door cover and the base layer.

Key points of door insulation design
RESOLVE SEALING ISSUES
1. The gap between the door leaf and the door cover, using a sealing strip. The shape adopts hollow style to enhance the sealing strength, and the material adopts imported TPE. Advantages: environmental protection, non-toxic, anti-aging, strong flexibility, high and low temperature resistance.
2. To further improve the amount of sound insulation, you can use double tongue and groove, the thickness of the door leaf needs to be 50mm-60mm.
3. When pursuing a higher level of sound insulation, we can cooperate with the setting of threshold stones. The general sill can be 15mm higher than the ground, and the anti-collision rubber is added between the threshold stone and the door or the sweep brush is increased under the door leaf. However, setting too high a threshold will cause certain inconvenience to the frequent entry and exit of moving objects and personnel, and a trade-off needs to be made when setting up.

SOLVE STRUCTURAL PROBLEMS
1. The thickness of the door leaf should be maintained at about 45mm ~ 60mm, the material inside the door leaf refuses to use low-cost materials such as door core or honeycomb board, density board, etc., and the bridge hole mechanical plate can be used as the material of the door core.
2. Enhancing the structural strength of the door leaf, we can make the door frame wooden with skeleton specifications ≥ 100mm, the horizontal wooden skeleton specifications ≥ 50mm, or increase the steel pipe skeleton, its specifications being ≥ 30mm * 20mm * 1.8mm.

Author: Lee Li, Editor: Joanne Yang

20/07/2022

FLOOR TAPPING SOUND PROCESSING FOR HOME ACOUSTICS

There are many concerns in home acoustics, such as the sound insulation of the walls between households, entrance doors, and external windows, the tapping sound of the floor of the upper and lower floors, the drainage noise of water pipes, the low-frequency noise caused by public space equipment units, and so on...
Today we focus on the knocking sound of the floor between the upper and lower residents: the footsteps of daily walking, the running and playing of children, and the dancing exercise with the Internet celebrity Liu Qihong... These daily behaviours in our lives, if there are not enough acoustic measures as a guarantee, will bring different degrees of noise nuisance to the downstairs residents, laying hidden dangers for the disharmony of neighbourhood relations.

There are two main ideas to solve the floor knocking sound: one is to do vibration damping cushion treatment at the source of the knocking sound (the upper household ground); The other is to do acoustic insulation at the receiving point (smallpox of the lower household). In contrast, the former is better treated.
UPPER FLOOR OCCUPANTS
The vibration damping cushion in the upper household treatment method has a variety of brands and models on the market, most of which are composite materials such as 5-12mm rubber/cork, and some surfaces will appear wavy - upside down installation will achieve better anti-knocking sound performance. Laboratory test reports mostly use parameters “IIC”, “Ln” or “w” to measure the product's percussion performance indicators.
This way of processing directly at the source of the tapping sound, the improvement effect is remarkable, but it needs to be considered in advance in the early design stage, and it is more difficult to wait until the late residential hardcover delivery before doing the demolition and modification (unless the residence is rough delivery, and the lower owner has acoustic awareness, and he takes the initiative to negotiate the ground installation details with the upper floor owner alone).

UPPER FLOOR OCCUPANTS
The treatment of the lower tenants is usually to do acoustic ceiling treatment: the keel creates space, fills the sound absorbing cotton and seals the plate. This treatment method is simple and easy, residents can complete the transformation in their own rooms, but also more convenient for the later transformation of use, the disadvantage is that this way of processing at the receiving point for the ground percussion sound improvement effect is relatively limited, may not be able to completely eliminate the noise nuisance caused by the knocking sound upstairs.

According to incomplete statistics, in recent years, social life noise complaints have accounted for more than half of the total number of urban complaints. With the continuous improvement of public attention, China's supporting relevant laws and regulations are also constantly improving (from June 5, 2022, the newly revised "Noise Pollution Prevention and Control Law of the People's Republic of China" will be fully implemented).
A good acoustic environment is the basic guarantee of people's healthy life, long-term exposure to a harsh acoustic environment will affect the quality of sleep, lead to neurasthenia, affect children's brain development, induce the elderly mental and cardiovascular-related diseases and so on. Especially in today's post-epidemic era, most of the time during the lockdown period is spent at home, and people are more urgently needed to have a good home sound environment.

Author: Willian Jiang, Editor: Joanne Yang

08/07/2022

APPLICATION OF COMPUTER SIMULATION SOFTWARE IN NOISE CONTROL

With the rapid development of the economy and the acceleration of the urbanization process, people enjoy the convenience of transportation while also suffering from the noise caused by traffic. Therefore, how to understand the noise situation more quickly and accurately and solve the noise problem is very important and urgent. This article mainly introduces the application of computer simulation software in railway noise control.

A common method for calculating the distribution of the sound field
There are three kinds: one is to use the formula to calculate, the second is to establish a shrink model for actual measurement, and the third is to use computer simulation to calculate the sound environment. The amount of work calculated by the formula is huge and inefficient. Accurate results can be obtained by building a shrink model, but it is expensive and not easy to adjust according to the modification of drawings. Using a computer to simulate the acoustic environment is more convenient and faster than the first two.

The calculation principle of the software is generally geometric acoustics, and the main outdoor computer simulation software is SoundPlan, Cadna/A and other simulation software. The following is a key introduction to the application of SoundPlan software.

COMPUTER NOISE SIMULATION PROCESS
1. ESTABLISHMENT OF 3D MODEL
The establishment of the SoundPlan computer model requires the calculation of the terrain and the building (if the terrain is small and undulating, the terrain calculation can be dispensed with), and the building shape, location relationship and terrain information are clearly indicated. For the target building complex, there should be detailed data on the height, number of floors and floor height, and the location of the sound source and the location of the sound barrier should be marked. The final simulation diagram is shown in Figure 1 and Figure 2.

2. COLLECTION OF SOUND SOURCE INFORMATION
The information of the sound source mainly includes the spectrum of the sound source (usually using 1/1, 1/3 octave), the length, height and directivity of the sound source, which need to be reflected in the model.
The accuracy of the sound source information directly affects the simulation results, the sound source information is usually obtained by the project site on-site measurement, if the simulation project conditions allow, we can directly measure the sound source, otherwise we will select a sound source similar to this project for testing.

3. PARAMETER SETTING AND CALCULATION
The final step of computer simulation is the setting of calculation parameters, mainly including: reflection order definition, reflection range, the longest calculation path, receiving surface height, these parameters can make us in the project according to the actual situation of more flexible settings, combined with long-term simulation experience, some parameters of the specific settings can improve the accuracy of computer simulation.

The computer simulation software has a high accuracy of free field in the simulation range, which can provide us with a good reference. Errors caused by simulation software algorithms should be taken into account when simulating complex complexes, residential complexes, etc. Through some experience corrections, the simulation results are more accurate, give full play to the advantages of efficient computer simulation, and propose corresponding solutions through computer simulation in the early stage of project construction.

Author: Devin Su, Editor: Joanne Yang

IHD Ltd

30/09/2022

16/09/2022

09/09/2022

19/08/2022

05/08/2022

29/07/2022

20/07/2022

08/07/2022

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