As pressure to reduce development costs drives the reuse of hardware and software platforms across multiple form factors (or even multiple applications), top consumer electronics manufacturers can use components that are as flexible and reconfigurable as possible Benefited a lot. However, flexibility introduces complexity, and balancing ease of use with reusability is challenging.
Mixed-signal audio components are no longer the most traditionally flexible devices, and their application-specific hardware prevents cross-platform reuse. Now, a new generation of audio hubs brings a new level of flexibility to audio in mobile devices, while also simplifying system integration. There are many other pleasant effects, which can ensure the realization of new application functions, reduce the bill of materials (BOM) cost, extend the talk time and improve performance.
Tablets and smartphones-what's the difference?
Tablet PCs provide the latest explanation for the reuse of hardware platforms, and most tablet PC manufacturers tend to reuse their smartphone platforms as much as possible. However, from an audio point of view, a tablet computer has several restrictive features, which is not ideal when using traditional architectures, and can result in waste and performance discounts.
Bigger
The larger form factor of the tablet provides room for more speakers and larger speakers, including low parasitic impedance speakers, which can provide higher output power at the same speaker driver power supply voltage. When optimized for the acoustic specificity of the playback device, advanced compression technology can further increase the volume (this is the opposite of compression at the source without considering the playback environment). Many tablet computers now include two to three speakers that can play stereo audio, and effective debugging can improve video playback or gaming experience.
However, the extra size and weight of tablet computers make them a bit inconvenient to carry. The result is a greater preference for indoor use, and browsing the experience on a larger screen in these places will be more enjoyable. Wi-Fi networks are everywhere in homes, offices, and commercial streets, making many low-cost tablet computers simply not capable of cellular wireless communications, which means that their voice communications will become more IP-based. However, during a voice call, for many typical smartphone platforms, there will be pre- and post-processing algorithms in a cellular communication modem, which means that in tablets without cellular mode, these algorithms must be Be transferred to a different processing core (usually an application processor), or in some cases implemented on additional hardware. This complicates the reuse of software and severely affects development time and cost.
Today, many audio hubs have been used as a transducer management platform, which greatly simplifies integration by allowing them to be tuned into operation later in development, without the need to change a stable host for the unique acoustic characteristics of each specific form factor and specific product software platform. In the slim modem architecture, the audio hub has gradually become the natural home for voice pre-processing and post-processing, which can shorten the time to market for many mobile applications while maintaining the consistency of audio "features" in different use cases.
The larger display of a tablet computer magnifies the importance of patterns and touch screen performance for users. Some of the latest innovations in the tactile feedback mechanism have the potential to make future touch screen applications more natural and interactive, and with it comes a variety of transducers embedded in the device, and their control signals are also increasing The more complicated it is, even with streaming technologies like audio. The correct audio architecture can now bring these new experiences to tablet users without significantly changing the system and without affecting the cost of more basic equipment.
No earpiece
The tablet computer always has no earpiece speaker, and the voice calls that occur are realized through the speaker mode or through the headset. At present, most tablets that reuse mobile phone designs still contain a mobile phone codec (codec) with a power amplifier. It originally designed to drive a receiver through the efficiency of its amplifier design or related analog signal routing. For example, suppose that the operation of the speaker and the headset are completely independent of each other). In fact, this is a redundant amplifier in most tablet computers, and they are not easily reworked into more useful functions in a tablet computer with a traditional architecture.
The lack of handset talk function, coupled with high-resolution displays, makes video phone and speaker performance particularly important for tablet computers. As high-bandwidth Wi-Fi networks are more and more commonly used, the frequency range of audio transmitted in a broadband voice call is larger, so now a more colorful and natural sound video call is theoretically Become possible. However, during a video call, the extra distance from the mouth to the microphone will increase the relative environmental noise level on the core signal of the remote caller. Therefore, the performance bottleneck of the entire call experience has shifted from network bandwidth to local signal processing capabilities, especially transmission path noise cancellation and echo cancellation performance.
cycle
Because the tablet can be held in portrait and landscape modes, the stereo context of the speakers can change significantly as the tablet's orientation changes. The tablet contains three or more speakers. If the left and right channel mappings are both orientation-sensitive, it can bring improved stereo performance, especially when using the stereo expansion algorithm. However, this is limited to when there are three or more speaker amplifiers available in the system. A typical smartphone has only one speaker built in, and the audio platform must provide this extension when the impact on software and hardware is minimized, while also not affecting the cost of more basic smartphones built on the same platform.
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