Sony Bravia S-Series KDL-40S4100 40-Inch 1080p LCD HDTV

Prepare for full 1080p HDTV. The 40" BRAVIA S Series KDL-40S4100 is an amazing value, and comes fully-loaded with 24p compatibility for smooth playback of filmed content. It also features a wide variety of HD inputs (3 HDMI, 2 component inputs, and a PC input) so you can connect it to a PlayStation 3, Blu-ray Disc player, and up to four more HD-enabled devices. Now you can watch all your favorite movies, sports, and games with the pristine picture and vibrant sound that you expect from a Sony at an unbelievable value.Movies and many prime time TV programs are captured at 24 frames per second (24p). Sony's Blu-ray Disc players wisely take advantage of this by including 24p output capability allowing a compatible connection with BRAVIA HDTVs that have this capability. The benefit - you can watch movies in natural, cinematic motion, the way they are seen at the cinema. Every single frame of the movie can now be seen without using additional video processing that converts film-based images to video reproduction.
Customer Review: No complaints
I dont have any complaints about this TV, it does everthing i need it to do. I am very satisfied. Colors are good, sound is good and shipping was exceptionaly fast.
Customer Review: Sony does it again
The Sony Bravia S-Series KDL-40S4100 40 inch LCD TV is fantastic. The picture is great and the sound fills my living room and both makes me feel I am actually in the picture. Some say it is slow in changing channels. Yes but if you hit the enter key after the number buttons it changes quickly. Unlike the newer version this model does not have the problem of going dark in dim scenes. It also receives all in the clear digital signals on my local cable system. If you want a great 40 inch LCD then look no further. Sony has really hit the mark with this tv.Sony Bravia S-Series KDL-40S4100 40-Inch 1080p LCD HDTV

We all hate cables running all over the floor, especially when they are not easily hidden. We just invested in a top-notch home theater system. We have a great video monitor, an audiophile quality home theater receiver, and some great speakers. So far, so good. Now it's time to connect the rear channel surround speakers. Agh! Our system look was just degraded from Star Trek to Mad Max. This is an obvious application for wireless, right?

Actually, there are some serious problems with using wireless techniques for surround sound channels.

Time Lag:

Wireless surround systems have a processing/transmission time lag that makes the sound from the rear channels out of sync with the audio from the front speakers. The inherent time required to generate the signal, transmit it to the speaker, decode the signal, and finally, to amplify the signal for the speaker causes the time offset. Minimal audio processing latency is required for effective surround sound.

The sound from the different speakers should be heard at the same instant. For most installations, the rear channels are closer to the listener than the front channels. For this reason, Dolby Digital and Dolby Surround Pro Logic systems apply a delay of a few milliseconds for the surround sound channels. The timing is that critical.

When humans hear the same sound from different directions, the illusion is created that the sound's source is a phantom location between the sound's sources. Recording engineers use balance controls to simulate sounds across the sound field, allowing them to locate sounds to different perceived locations across the sound stage. Timing is critical between surround channels where depth and location information are to be determined by the ears, and ultimately, by the brain.

Interference:

The second problem with wireless surround systems is interference. There are multiple technologies used for wireless surround, and the source of interference is specific to the technology.

Both Bluetooth and Wi-Fi devices operate within the 2.4 GHz band. Bluetooth is the technology that is used frequently for wireless keyboards and mice, but the capability of Bluetooth systems is marginal for surround sound applications. A Bluetooth signal power is only about 1 milliwatt. Dolby Digital requires a bandwidth of about 400 Kbps and Dolby DTS uses a bandwidth of about 450 Kbps for a 5.1 system. Bluetooth has a maximum data transfer rate of 433 Kbps, which is cutting it pretty close.

Another alternative for surround sound transmission is Wi-Fi 802.11b (also in the 2.4 GHz band, as is 802.11g ). An 802.11b signal is capable of 54 Mbps maximum throughput (30 Mbps in practice), which is more than sufficient for this application.

However, there are significant sources of interference in this 2.4 GHz spectrum from cordless phones, other Wi-Fi equipment like wireless-enabled laptops, wireless game controllers, fluorescent lights, and even microwave ovens. Even bad electrical connections can cause broad Rf spectrum emissions.

Bluetooth attempts to avoid interference by "frequency-hopping". If the signal is receiving interference, it will (hopefully) only be for a fraction of a second, because the system will identify the interference, and switch to a different frequency. Wi-Fi also has the ability to avoid interference by changing channels, and by redundant loops of information transmission Many Wi-Fi products claim to mange interference problems. Unfortunately, the products are limited by the capabilities of the 802.11 chipsets, and the 802.11 protocol itself.

IR (infrared), which is most often used by remote controls, is yet another technology sometimes used for wireless surround. IR has a bandwidth capability of more than 100 Mbps. IR for data transmission was popular on laptop computers a few years ago. More recently, it has been replaced by other wireless technologies such as Bluetooth, because they don't need a direct line of sight (LOS). IR transmission is lost whenever there is a loss of LOS between the transmitter and the receiver, and, in addition, the signal is subject to interference from IR remote controls and ambient light.

Power:

A third problem is that the rear speakers will require a power source if they are receiving the signals wirelessly. They will need power not only for the actual speakers, but they will also need power for an on-board amplifier. If our goal is to eliminate all wires, this is a problem. Powercast (Pittsburgh, PA) has a technology that will wirelessly supply power to small appliances like cell phones, but the maximum rate is 10-15 watts, not enough for surround channels.

On a final note, if you decide to purchase a wireless surround system, read the product attributes carefully. I recently assisted on an installation where a DVD/Receiver system was bought with wireless capability. However, in this case, the wireless capability was for distribution to a second room for the primary channels, not a wireless capability for surround channels.

About the Author: Brian Bradshaw is a Certified Technical Specialist (InfoComm CTS) and a CompTIA A+ computer technologist. Areas of expertise include Audio-Video, Information Technology, Wi-Fi, HDTV, SATCOM Systems, and Communications. He has a communications technology business that serves the Southwestern United States with offices in Plano, Texas (Dallas) and an office in Peoria, Arizona (Phoenix), managed by his brother, Keller Bradshaw.

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