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CDB4923

Multi-Channel Digital Audio Decoders

Cirrus Logic 

CS4923/4/5/6/7/8/9

User’s Guide to determine which formats are sup-

ported by a particular application. A brief descrip-

tion of each format is presented below.

Elementary - an elementary bitstream consists only

of compressed audio data (e.g., strictly the Dolby

Digital bitstream); used primarily in broadcast en-

vironments.

PES - a Packetized Elementary Stream (PES) bit-

stream contains the elementary compressed audio

stream and additional header information which

can be used for A/V synchronization; used primari-

ly in broadcast environments.

IEC61937 - a method of packing compressed audio

such that it can be delivered using a bi-phase en-

coded signal (e.g., S/PDIF output signal from DVD

player); used primarily for outboard decoders

where A/V synchronization is not required.

2.1 Multi-channel Decoder Family of Parts

CS4923 - Dolby DigitalTM Audio Decoder. The

CS4923 is the original member of the family and is

intended to be used if only Dolby Digital decoding

is required. For Dolby Digital, post processing

includes bass management, delays and Dolby Pro

Logic decoding. Separate downloads can also be

used to support stereo to 5.1 channel effects

processing and stereo MPEG decoding.

CS4924 - Dolby DigitalTM Source Product

Decoder. The CS4924 is the stereo version of the

CS4923 designed for source products such as

DVD, HDTV, and set-top boxes. Separate

downloads are available for stereo decode of Dolby

Digital and MPEG audio.

CS4925 - International Multi-Channel DVD

Audio Decoder. The CS4925 supports both Dolby

Digital and MPEG-2 multi-channel formats. For

both Dolby Digital and MPEG-2 multi-channel,

post processing includes bass management and

Dolby Pro Logic decoding. Separate downloads are

available for decode of Dolby Digital and MPEG

audio. Another code load can be used to support

stereo to 5.1 channel effects processing.

CS4926 - DTS/Dolby® Multi-Channel Audio

Decoder. The CS4926 supports both Dolby Digital

and DTS, or Digital Theater Surround. For Dolby

Digital, post processing includes bass management

and Dolby Pro Logic. The Dolby Digital code and

DTS code take separate code downloads. Separate

downloads can also be used to support stereo to 5.1

channel effects processing and stereo MPEG

decoding.

CS4927 - MPEG-2 Multi-Channel Decoder. The

CS4927 supports MPEG-2 multi-channel decoding

and should be used in applications where Dolby

Digital decoding is not necessary. For MPEG-2

multi-channel decoding, post processing includes

bass management and Dolby Pro Logic decoding.

Another code load can be used to support stereo to

5.1 channel effects processing.

CS4928 - DTS Multi-Channel Decoder. The

CS4928 supports DTS multi-channel decoding and

should be used in applications where Dolby Digital

decoding is not necessary. For DTS multi-channel

decoding, post processing includes bass

management. Separate downloads can also be used

to support stereo to 5.1 channel effects processing

and stereo MPEG decoding.

CS4929 - AAC 2-Channel, (Low Complexity) and

MPEG-2 Stereo Decoder. The CS4929 is capable

of decoding both 2-channel AAC and MPEG-2

audio. The CS4929 supports elementary and PES

formats.

2.2 Document Strategy

Multiple documents are needed to fully define,

understand and implement the functionality of the

CS4923/4/5/6/7/8/9. They can be split up into two

basic groups: hardware and application code

documentation. It should be noted that hardware

and application code are co-dependent and one can

not successfully use the device without an

DS262F2

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