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HDMI transceiver simplifies home theater system design

In Electronic Infomation Category: H | on April 19,2011

Stand-alone home theater (HTiB), SOUNDBAR speakers and ST16C550IQ datasheet and AV receiver (AVR) to provide users with superior audio experience and ST16C550IQ price and to make improvements to HDTV video performance. Extraction and ST16C550IQ suppliers and processing capacity of high-fidelity audio signals is the selection of the hardware currently on the market a big key. Home theater systems can now provide high-definition multimedia interface (HDMI ? ) for all the latest features (seamless integration with the device.)

For the HTiB, SOUNDBAR speakers and AVR system design staff, to improve the user experience of home theater means been overcome implementation challenges. Latest HDMI standard has added a new features such as audio return channel (ARC), 3D display formats and control of consumer electronics (CEC) protocol improvements. Of course, consumers want to buy their new home theater equipment can have all these new features HDMI, and inexpensive, easy manipulation. Therefore, the design of home theater equipment must meet the new standards, but also reduce material costs, development costs and time to market. To help designers cope with such challenges, ADI has introduced these new features of HDMI integrated transceiver products.

The ADV7623, for example, this transceiver with integrated HDMI 4:1 HDMI input multiplexer (mux), HDMI receiver, screen display (OSD) engine, and HDMI transmitter. To the individual, requires each of these functions should be independent of each other and five * eight IC firmware, but a transceiver to all of the features can be combined into a comprehensive solution, saving board space, reducing the firmware complexity, reduced material costs, for the home theater system designers brought great convenience.

Figure 1. HDMI transceiver functional block diagram

Home theaters

HTiB systems are complete video playback, the general multi-channel surround sound audio amplifier and sound system to play audio. In addition, the system typically also includes a DVD or Blu-ray ? video player. HTiB simplifies the video player, amplifier and speakers installed and power matching, which is mainly dealing with audio and video through the HDMI interface to send to the TV. Figure 2 shows a typical HTiB system.

Figure 2. Typical HTiB system diagram

SOUNDBAR Speaker With the ultra-thin large screen

the increasing popularity of flat-panel TVs, new SOUNDBAR speaker become a complementary audio and video systems. This compact sound system, easy installation, sound quality is much higher than the TV speakers. Most HTiB and SOUNDBAR speakers are supporting the use of big screen HDTV, so the main use of audio and video connection HDMI interface. SOUNDBAR speakers generally have multiple HDMI inputs for a variety of sources, with an HDMI output for connection to TV, and built-in audio processing system and speakers. Figure 3 shows a typical SOUNDBAR speaker system.

Figure 3. SOUNDBAR with HDMI hub of a typical block diagram of speakers Senior SOUNDBAR

multiple speakers and amplifiers with speakers, with surround sound decoding capability, the electronic and acoustic design features can produce surround sound without the need for separate speakers placed at the back. SOUNDBAR speaker system consists of high-end DVD or Blu-ray player, to form a similar architecture with the HTiB.

Audio return channel (ARC)

As new features in the HDMI specification, audio return channel (ARC) to HTiB to handle the audio from the downstream device. If you do not want to listen to the case of ARC TV audio, you need a separate cable (S / PDIF optical or coaxial cable) to TV or tuner audio back to the HTiB. With ARC, HDMI cable to connect the 2-channel S / PDIF or multi-channel audio from the TV back to the HTiB, without the use of additional audio cable. HDMI HDMI output port transceiver offers a ARC receiver.

On television, set-top box or other receiving device using the HDMI downstream tuner to receive the case of new media content, ARC becomes significant. Users who do not want to listen to the performance of the general sound of the TV speakers, you can easily use high-fidelity HTiB system output. Return of the audio data is passed through the HDMI cable from TV to the HTiB (the direction of the video data path with the traditional vice versa), do not worry about the video output on the HTiB whether the cable is active.

3D video

As 3D content sources (such as game consoles, Blu-ray players and 3D TV and so on) the connection between the bridge, HTiB manufacturers must always stand on cutting edge of technology, constantly new features designed to provide the source device and receiving device for customers to enjoy the full functionality from the long-term interests. HDMI transceiver uses the latest HDMI technology for the home theater system can be added to 3D video experience. This new HDMI standard features significantly improve the user experience as the key to boost TV sales. The specification defines a family

play 3D video infrastructure to support a range of mandatory and optional video formats. In practice, HTiB must connect the source to submit their list of supported 3D format - to read from the connection of the television and for its own 3D format support list for analysis, then, connect the source to send 3D content through the HDMI protocol when command informed HtiB, HTiB will then extract and output advanced audio formats, such as Dolby TrueHD? or DTS-HD Master Audio?, these formats to send via HDMI link, unless the TV may not have support.

Extended Display Identification Data (EDID) Copy

HDMI transceivers with EDID copy feature that allows multiple HDMI ports share a single storage location (even if the HTiB is in power saving mode). This feature can reduce boot time, because all upstream HDMI source devices can be in the HTiB rational allocation of power before its video output. EDID copy function only +5 V/55 mA power supply, provided through the HDMI cable.

Screen display (OSD)

HTiB with many user controls, such as between multiple input options, select the desired audio and video formats and advanced audio processing options configuration. You can use the screen display (OSD) features an intuitive easy to control these complex features. OSD usually achieved through a dedicated device, but now HDMI transceiver integrated OSD engine, display the required information into the output video - for the HTiB manufacturers save a considerable cost of external solutions. In addition, cost-saving devices and materials costs, while reducing the OSD software is integrated into the design of the system firmware.

Audio insertion and extraction

HDMI transceiver HTiB Another purpose is to extract the HDMI audio, and use digital signal processing (DSP) chip for processing. Thus, re-insert the HDMI audio stream sent to TV. TV can not handle as many multi-channel audio formats, and DSP chips can be sampled under the stereo audio, and then reinsert the HDMI audio link sent to the TV.

Or HTiB input audio source can be completely replaced by the new data stream and embedded HDMI signal sent to the TV. In this case, only the audio features can be inserted. One example of such applications is the iPod? Access HtiB, independent of its audio and video streams mixed together.

In the home theater configuration, HTiB HDMI repeater system can be used to accept HDMI input and then send the output as HDMI. For example, the Blu-ray player, HTiB can be used as the source of the input device. To take advantage of much higher than the TV speaker HTiB sound, it must HTiB extract the audio from the HDMI signal. Ideally, audio enthusiasts will want to HTiB to 8-channel I2S audio output completely, but the HDMI link can also provide 2-channel I2S or S / PDIF. Video to be sent to a TV or monitor, to complete the system path. Only HDMI / HDCP (High-bandwidth Digital Content Protection) repeater or transceiver type of device can handle this audio extraction.

Consumer Electronics Control (CEC) extension

Consumer Electronics Control (CEC) channel is one-way communication interface, enabling home entertainment system network operations. For example, a single button using a remote control entertainment system in the simultaneous switching of all devices. HDMI standard has been extended to support ARC and HDMI Ethernet channel (HEC) and other new features, HDMI CEC transceiver command within the library also will be expanded to provide support. The HTiB design staff, support the latest HDMI features CEC will also support the latest features. HDMI transceiver can handle the current ARC and the HEC-line session on the network discovery, negotiation, start and termination.

Firmware / repeater support

HTiB speaker design and SOUNDBAR biggest challenge is to achieve a HDCP repeater function. HTiB repeater function is to implement content protection, EDID management and integrated video and audio mute. HDMI repeater transceiver the entire process into a single device, and firmware and reduces the complexity of system development.

Video processing devices with increasing complexity, high quality and reliable software, hardware abstraction library and application programming interface (API) to become the designers major advantage - reduced time to market and from the HDMI and HDCP build a good compatible platform started. If from the outset by a shared code base chip makers can further cost savings: in the high-end HTiB discrete manufacturers use the same receiver and transmitter, you can upgrade later be integrated into the transceiver in the low-end coding HTiB in the benefits.

Cost 2-layer circuit board design

New HDMI transceiver quad flat package (QFP) technology to provide efficient circuit board layout and alignment options. And more complex ball grid array (BGA) package, the thin LQFP package can save manufacturing costs, reduce complexity and simplify the product inspection. LQFP greatly simplifies the layout issues, can actually be deployed in two packages on the shelves, in order to achieve low cost, while meeting all the necessary physical layer compliant HDMI test impedance measurement.

2 laminates design difficulties include: Managing Routing power transceiver and full decoupling; to provide the best thermal conductivity; for transition minimized differential signaling (TMDS) differential input and output impedance required for the alignment of wiring. However, by using surface-mount discrete devices, using the principles of good layout and with the printed circuit board (PCB) and chip vendors in close cooperation, fully able to achieve excellent performance does not compromise the success of the layout.


HDMI transceiver can help system designers to reduce the home theater system design cost and difficulty, and features the latest HDMI audio-visual experience to meet consumer demand. Such transceivers can be achieved using the ARC and 3D video HDMI features. HDMI signal path on the integrated screen display (OSD) engine, reducing the HTiB and SOUNDBAR speaker design cost and complexity. HDMI stream in the extraction, processing and enhance this functionality into the audio system design in consumer home theater experience. SOUNDBAR system used in the HTiB and HDMI repeater, the new transceiver for system design and firmware can be seamless. HDMI transceiver wiring can be successfully achieved in two laminate, thereby reducing material costs.

Figure 4 shows a typical use of ADI Corporation ADV7623 HDMI transceiver system the system will be the receiver HDMI input 4 (Rx) and HDMI with audio extraction capabilities of the transmitter (Tx) integration. HDMI signal is decoded by the SHARC audio DSP to extract and process the audio content. Then, after the audio amplifier and speakers or sent to re-insert the HDMI signal path. The transceivers also integrate the OSD, OSD engine eliminates the need for separation costs in SOUNDBAR speaker system design is very practical. ADV7623 provides copy EDID, HDCP repeater function support and ARC to support a mandatory 3D video formats. ADV7623 are available now, with 144-pin LQFP package 2 layer PCB design easier.

Figure 4. Transceiver using ADV7623 HDMI HTiB systems

HDMI transceiver multi-input HDMI receiver and HDMI transmitter integrated in a single chip, the flexibility to extract and insert the audio. HDMI transceiver will be used for HDMI A / V repeater design (including AVR, HTiB, and SOUNDBAR speakers) will be:

Reduce system bill of materials cost - fewer components, PCB area is smaller, PCB layer less.

Greatly reduce the HDMI repeater system hardware and software design work, thereby significantly reducing time to market.

This will enable HDMI transceiver into low-cost, high-performance home audio-visual system design, great choice.

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