i got and now get this same error after running windows update to update whatever it updated to get this error . i see at the end of this thread , something about compatibility however that was in november and we are now in april so it would be nice to see a fix for this problem instead of just rolling back the driver as again windows update located this updated driver , so according to windows , this file should be compatible with my system . i however have the acer v5-473pg .
any solutions yet acer ? it's been a while . Download subtitle indo. thank you , and i'd rather not use older drivers and rather the newer drivers that microsoft recommends , that have been released for the product being updated . thank you . also . will this error somehow limit the functionability of my system or can i just ignore the error and the system will function as intended ? getting deep here i know , but i don't mind pressing okay to this popup since i rarely restart my system and i only get the error popup when the system has been restarted . or is a fix in the works and what does this error even mean in layman terms besides the system expecting an outdated driver ? please elaborate . thank you . Related searches
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Dolby Digital Plus, also known as Enhanced AC-3 (and commonly abbreviated as DD+ or E-AC-3, or EC-3) is a digital audio compression scheme developed by Dolby Labs for transport and storage of multi-channel digital audio. It is a successor to Dolby Digital (AC-3), also developed by Dolby, and has a number of improvements including support for a wider range of data rates (32 Kbit/s to 6144 Kbit/s), increased channel count and multi-program support (via substreams), and additional tools (algorithms) for representing compressed data and counteracting artifacts. While Dolby Digital (AC-3) supports up to five full-bandwidth audio channels at a maximum bitrate of 640 Kbit/s, E-AC-3 supports up to 15 full-bandwidth audio channels at a maximum bitrate of 6.144 Mbit/s. The full set of technical specifications for E-AC-3 (and AC-3) are standardized and published in Annex E of ATSC A/52:2012,[1] as well as Annex E of ETSI TS 102 366 V1.2.1 (2008–08), published by the Advanced Television Systems Committee.
Technical details[edit]Specifications[edit]Dolby Digital Plus is capable of the following:
Structure[edit]A Dolby Digital Plus service consists of one or more substreams. There are three types of substreams:
All DD+ streams must contain at least one independent substream or legacy substream, which contains the first (or only) 5.1 channels of the primary audio program. Additional independent substreams may be used for secondary audio programs such as foreign language soundtracks, commentary, or descriptions/voiceovers for the visually impaired. Dependent substreams may be provided for programs that have additional soundstage channels beyond 5.1. Within each substream, provision is made for encoding five full-bandwidth channels, one low-frequency channel, and one coupling channel. The coupling channels is used for medium-to-high-frequency information which is common to multiple full-bandwidth channels. Its context is mixed in with the other channels in a fashion prescribed by the metadata, it is not reproduced as a discrete channel by the decoder. Dolby Digital Plus includes comprehensive bitstream metadata for decoder control over output loudness (via dialnorm), downmixing, and reversible dynamic range control (via DRC). Syntax[edit]Dolby Digital Plus is nominally a 16-bit-aligned protocol, though very few fields in the syntax respect any byte or word boundaries. As many syntax elements are optional or variable-length, including some whose presence or length is dependent on complex preceding calculations, and there is little redundancy in the syntax, DD+ can be extremely difficult to parse correctly, with syntactically valid but incorrect parsings easily produced by defective encoders. A DD+ stream is a collection of fixed-length syncframe packets, each of which corresponds to either 256, 512, 768, or 1536 consecutive time-domain audio samples. (The 1536-sample case is the most common case, and corresponds to Dolby Digital; the shorter subframe lengths are intended for use in interactive applications like video games where reducing encoder latency is an important concern). Each syncframe is independently decodable, and belongs to a specific substream within the service. A syncframe consists of the following syntax elements (some of which may be elided when a Dolby Digital Plus service is encapsulated into another format or transport):
Dolby Digital Plus SoftwareStorage of transform coefficients[edit]At the heart of both Dolby Digital and DD+ is a modified discrete cosine transform (MDCT), which is used to transform the audio signal into the frequency domain; within each block up to 256 frequency coefficients may be transmitted. Coefficients are transmitted in a binary floating-point format, with exponents transmitted separately from mantissas. This allows for highly efficient coding. Exponents for each channel are encoded in a highly packed differential format, with the deltas between consecutive frequency bins (other than the first) being given in the stream. Three formats, or exponent strategies, are used; these are known as 'D15', 'D25', and 'D45'. In D15, each bin has a unique exponent, while in D25 and D45, delta values correspond to either pairs or quads of frequency bins. Audio blocks other than the first in a syncframe may additionally reuse the prior block's exponent set (this is required for channels that use the Adaptive Hybrid Transform). The decoded exponents, along with a set of metadata parameters, is used to derive the bit allocation pointers (BAPs), which specify the number of bits allocated to each mantissa. Bins which correspond to frequencies in which human hearing is more precise are allocated more bits; bins which correspond to frequencies that humans are less sensitive to are allocated fewer. Anywhere between zero and 16 bits may be allocated for each mantissa; if zero bits are transmitted, a dither function may be optionally applied to generate the frequency coefficient. Algorithm[edit]Dolby Digital Plus, like many lossy audio codecs, uses a heavily quantized frequency-domain representation of the signal to achieve coding gain; this section describes the operation of the base transform as well as various optional 'tools' specified by the standard, which are used to achieve either greater compression or to reduce audible coding artifacts. Modified discrete cosine transform[edit]Both Dolby Digital and DD+ encoder converts a multichannel audio signal to the frequency domain using the modified discrete cosine transform (MDCT), with a switchable block length of either 256 or 512 samples (the latter is used with stationary signals, the former with transient signals). The frequency domain representation is then quantized according to a psycho-acoustic model and transmitted. A floating-point format for frequency coefficients is used, and mantissas and exponents are stored and transmitted separately, with both being heavily compressed. Adaptive hybrid transform (AHT)[edit]For highly stationary signals, such as long notes in musical performance, the Adaptive Hybrid Transform (AHT) is used. This tool is unique to Dolby Digital Plus (and unsupported in Dolby Digital), and uses an additional Type II discrete cosine transform (DCT) to combine six adjacent transform blocks (located within a syncframe) into an effectively longer block. In addition to the two-stage transform, a different bit-allocation structure is used, and two ways of representing encoded mantissas are deployed: use of vector quantization, which gives the highest coding gain, and use of gain-adapted quantization (GAQ) when greater signal-fidelity is required. Gain-adaptive quantization may be independently enabled for each frequency bin within a channel, and permits variable-length mantissa encoding. Coupling[edit]As many multichannel audio programs have high degrees of correlation between individual channels, a coupling channel is typically used. High frequency information which is common among two or more channels is transmitted in a separate channel (one that is not reproduced by a decoder, but only mixed back into the original channels) known as the coupling channel; along with coefficients known as 'coupling coordinates' that guide the decoder on how to reconstruct the original channels. Dolby Digital Plus supports a more elaborate version of the coupling tool known as Enhanced Coupling (ECPL). This algorithm, which is considerably more expensive to process (both for encoders and decoders) allows phase information to be included in coupling coordinates, allowing for phase relationships between channels that are coupled to be preserved. Spectral extension[edit]Dolby Digital Plus provides another tool for high frequencies. As high frequency components are often harmonics of lower-frequency sounds, Spectral Extension (SPX) allows high frequency components to be synthesized algorithmically from lower-frequency components. This tool is also unique to Dolby Digital Plus, and unsupported in Dolby Digital. Rematrixing[edit]Stereo programs are typically rematrixed and encoded as an L+R and L-R channel. This is done both to increase coding gain (the L-R channel can typically be heavily compressed, and the subsequent un-matrixing will cause many compression artifacts to cancel), and to preserve phase relationships necessary for proper playback of Dolby Surround-encoded material. Transient pre-noise processing[edit]Transient pre-noise processing (TPNP) is a Dolby Digital Plus-specific tool to reduce the resulting artifacts of signal quantization and other compression techniques. Unlike the other tools described above, which operate in the frequency domain and precede the conversion back into PCM samples, TPNP is a tool which essentially performs a windowed cut-and-paste operation on the time-domain signal to erase certain predictable quantization artifacts. Relation to Dolby Digital[edit]Dolby Digital Plus bitstreams are not directly backward compatible with legacy Dolby Digital decoders. However, Dolby Digital Plus is a functional superset of Dolby Digital, and decoders include a mandatory component that directly converts (without decoding and re-encoding) the Dolby Digital Plus bitstream to a Dolby Digital bitstream (operating at 640 kbit/s) for carriage via legacy S/PDIF connections (including S/PDIF over HDMI) to external decoders (e.g. AVRs, etc.). All Dolby Digital Plus decoders can decode Dolby Digital bitstreams. Dolby Digital Software For PcDynamic range compression[edit]One design goal of DD+ is quality playback in a variety of environments, ranging from home theaters and other acoustically controlled environments where high dynamic range playback is feasible, to portable and automotive environments where lots of background noise is present, and dynamic range compression may be necessary to make all parts of an audio program audible. DD+ provides the following operating modes for different listener/viewer environments. Dolby Digital Plus Decoder Operating Modes:
Note: All of the decoder operating modes (listed above) are available in every Dolby Digital Plus decoder. The default operating mode is governed by device category and application. In some devices, users may also have a choice (via menu) to select an alternate mode that suits their particular taste and/or application. In addition, Dolby Digital and DD+ contain additional metadata to permit error-free translation into range-restricted downstream channels, such as RF modulation, where excessive output signal amplitude may result in significant distortion or modulation errors. Encapsulation, use, and storage of Dolby Digital streams[edit]Physical transport for consumer devices[edit]![]() IEC 61937-3: defines how to transmit Dolby Digital (AC-3) and Dolby Digital Plus (E-AC-3) bitstreams via an IEC 60958/61937 (S/PDIF) interface. However, the S/PDIF interface has insufficient bandwidth to transport Dolby Digital Plus (E-AC-3) bitstreams at the 3.0Mbit/s datarate specified by HD DVD; lower datarates are possible. Much consumer gear, and even some professional gear, does not recognize Dolby Digital Plus as an encoded format, and will treat DD+ signals over a S/PDIF or similar interface, or stored in a .WAV file or similar container format, as though they were linear PCM data. This is not problematic if the data is passed unchanged, but any gain scaling or sample rate conversion, operations which are aurally harmless to PCM data, will corrupt and destroy a Dolby Digital Plus stream. (Older codecs such as DTS or AC-3 are more likely to be recognized as compressed formats and protected from such processing). Dolby Digital Plus may be transmitted across HDMI 1.3 or newer, according to IEC 61937-3. Dolby Digital Plus Software Application FreePhysical transport for professional devices and applications[edit]As the AES-3 interface is the professional analog to S/PDIF, Dolby Digital Plus streams may be carried over AES-3 connections with sufficient bandwidth, and/or over other interfaces that encapsulate AES-3 (such as SMPTE 259M and SMPTE 299M embedded audio). Additional standards promulgated by SMPTE specify the encoding of Dolby transports, including Dolby Digital, Dolby Digital Plus, and Dolby E (a professional-only codec used in audio/video applications) on an AES interface. The SMPTE 337 standard specifies the signalling and carriage of signals that are not PCM audio over an AES-3 interface, and the SMPTE 340-2008 standard specifies how Dolby Digital Plus and Dolby Digital are to be transmitted over that interface. The combination of SMPTE 340-2008 and 337M allow the Dolby Digital Plus bitstream to be stored and transported within professional production, contribution and distribution workflows prior to emission to consumers. Consumer broadcast in digital television systems[edit]Either DD+ or Dolby Digital is specified by the Advanced Television Systems Committee as the primary audio codec for the ATSC digital television system, and is commonly used for other DTV applications (such as cable and satellite broadcast) in countries which use ATSC for digital television. For broadcast (emission) to consumers, the Dolby Digital Plus bitstream is packetized in an MPEG elementary stream, and multiplexed (with video) into an MPEG Transport Stream. In ATSC systems, the specification for carrying Dolby Digital Plus is described in ATSC A/53 Part 3 & Part 6. In DVB systems, the specification for carrying Dolby Digital Plus is described in ETSI TS 101 154 and ETSI EN 300 468. Dolby Digital Plus is seeing increasing use in digital television systems, particular in cable and satellite systems, as a replacement for Dolby Digital. Many such applications don't take advantage of its higher channel count or ability to support multiple independent programs; instead it is used as a higher-efficiency codec than AC-3. HD DVD and Blu-ray Disc[edit]Both the now-defunct HD DVD standard, and Blu-ray Disc include Dolby Digital Plus. It is a mandatory component of HD DVD and an optional component of Blu-ray. The maximum number of discrete coded channels is the same for both formats: 7.1. However, HD DVD and Blu-ray impose different technical constraints on the supported audio-codecs. Hence, the usage of DD+ differs substantially between HD DVD and Blu-ray Disc.
On HD DVD, DD+ is designated a mandatory audio codec. An HD DVD movie may use DD+ as the primary (or only) audio track. An HD DVD player is required to support DD+ audio by decoding and outputting it to the player's output jacks. As stored on disc, the DD+ bitstream can carry for any number of audio channels up to the maximum allowed, at any bitrate up to 3.0 Mbit/s. On Blu-ray Disc, DD+ is an optional codec, and is deployed as an extension to a 'core' AC-3 5.1 audiotrack. The AC-3 core is encoded at 640 kbit/s, carries 5 primary channels (and 1 LFE), and is independently playable as a movie audio track by any Blu-ray Disc player. The DD+ extension bitstream is used on players that support it by replacing the rear channels in the 5.1 setup with higher fidelity versions, along with providing a possible channel extension to 6.1 or 7.1. The complete audio track is allowed a combined bitrate of 1.7 Mbit/s: 640 kbit/s for the AC-3 5.1 core, and 1 Mbit/s for the DD+ extension. During playback, both the core and extension bitstreams contribute to the final audio-output, according to rules embedded in the bitstream metadata. Media players and downmixing[edit]Generally, a Dolby Digital Plus bitstream can only be transported over an HDMI 1.3 or greater link. Older receivers support earlier versions of HDMI, or only have support for the S/PDIF system for digital audio, or analog inputs. For non-HDMI 1.3 links, the player can decode the audio and then transmit it via a variety of different methods.
Most receivers and players support S/PDIF. This lower bandwidth digital connection is not capable of transmitting lossless PCM audio with more than two channels, but a player can transmit a S/PDIF compatible audio stream to the receiver in one of the following ways:
Should the player need to decode the audio for a non-HDMI 1.3 receiver, the results should be predictable. The DD+ specification explicitly defines downmixing modes and mechanics, so any source soundfield (up to 14.1) can be reproduced predictably for any listening environment (down to a single channel). See also[edit]References[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Dolby_Digital_Plus&oldid=897401390'
Hello,
I have an Acer Aspire V5-552-x671 that is running Windows 10. It has been for some time now. Recently I got a blue screen error that was something to the effect of 'Not greater or less' When I searched for the exact term, I was told that the solution was to update all the hardware drivers. So, I downloaded DriverEasy, and updated all my drivers. Something to the effect of 10-15. I noticed sometime after that I received the error 'The current dolby digital plus audio driver version is 7.6.4.9 and the software application expects driver version 7.3.2.2 please install a valid driver and software application combination' I'm not sure if it is relating to the driver updates or not though (Or possibly a windows update), because I do not turn my computer off, ever. I do not find Dolby Digital Sound in the Device Manager list. If I search for Dolby Digital sound, I do find the program, and I can open the file location, and right click, but if I select to restore previous versions, it finds none. How can I update the driver to what it needs to be in order to run properly? Thank you in advance, Skenyon02 April 18 - 2014 - I recently reset my Lenovo C460 All-in-One Windows 8.1 (64 bit) computer and reinstalled windows. My updates are all installed. I now get this error message at restart each time: 'The current Dolby Digital Plus audio driver version is 7.6.3.1 and the software app expects driver version 7.5.1.1. Please install a valid driver and software application combination.' I checked in Control Panel Device Manager the drivers under Audio and under Sound, Video, game, etc. - which windows says are all up to date. Under Sound, Video, games - Device manager lists 2 drivers: Lenovo USB Audio (driver up to date) and Realtek High Definition Audio (driver up to date - version 6.0.1.7404..by Realtek Semiconductor Corp) Gone into control panel and Dolby Digital Plus icon is there but when I try to right click and bring any menu up - I get the above error message again. Cannot find specific answer to this as some postings on forums (Lenovo and Microsft) say to uninstall drivers (Dolby, Conexant and Realtek and then reinstall Dolby.) I have NOT uninstalled Realtek driver I have on my computer yet because I have gone to Lenovo website and have downloaded most recent Realtek driver available in Lenovo downloads. Am concerned about causing more problems on my PC and since I am not programmer smart and some PC language posted I do not understand, I am not sure what to do. Free visio download. If you are posting suggestions, please help my by posting step by step help. (ie if you tell me uninstall Realtek driver, please tell me step by step how to re-install it or which driver I need from trusted website) Please only post answers S P E C I F I C to my machine and currently installed drivers and version of windows. My sound works fine on my computer by the way. I only use this once in a while to watch movies but not to play any games like xbox, etc. Many thanks. Comments are closed.
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