JOINT[S] Chips Technologies have experience in development of following multimedia codecs. This involves algorithmic optimizations, processor architecture exploitation, and MIPS optimizations. . We have full expertise on following ISO/IEC and ITU-T multimedia standard codecs on DSP and RISC platform:

Speech Codecs:

o G.723.1

ITU-T G.723.1 dual rate speech coder performs compression and decompression. The codec has selectable transmission rates of 5.3 or 6.3 Kbps channel stream providing 4 kHz of quality speech bandwidth.

It encodes speech or other audio signals in frames using linear predictive analysis-by-synthesis coding. The excitation signal for the high bitrate coder is Multipulse Maximum Likelihood Quantization (MP-MLQ) and for the low bitrate coder is Algebraic-Code-Excited Linear-Prediction (ACELP).

Specifications:
1. 6.3 kbps and 5.3 kbps stream at 8 KHz sample rate.
2. Additional features includes Voice Activity Detection / Comfort Noise Generation (VAD / CNG).
3. Bit Compliant with ITU-T test vectors.

Applications:
1. Voice over Internet (VoIP) applications.
2. Videoconferencing (H.323).
3. Multimedia services at low bitrate.

Audio Codecs:

o MP3

JOINT[S] Chips has experience in implementation of the MPEG-1 (ISO/IEC 11172-3) and MPEG-2 (ISO/IEC 13818-3) standards. Joints codec implementation supports all audio layers of ISO/IEC 11172-3 3 and ISO/IEC 13818-3 including layer 3 popularly known as 'MP3'. CD-ROM quality is achievable at 128 kbps.

Specifications:
1. 16 to 48 KHz sampling rate supported
2. 8 to 320 Kbps stream supported.
3. Limited arithmetic accuracy with ISO/IEC 11172-3 and ISO/IEC 13818-3 audio standards
4. Subjective and objective testing experience as per the MPEG1/2 Part 4.
5. 16 bit decoded output.

Applications:
1. Portable & handheld audio systems.
2. Internet applications.
3. Internet Streaming.

o Ogg Vorbis

Ogg Vorbis is a new audio compression format. It is roughly comparable to other formats used to store and play digital music, such as MP3, AAC, and other digital audio formats. It is different from these other formats because it is completely free, open, and unpatented. That means CD-ROM quality is achievable at around 96 kbps.

Specifications:
1. 8 to 96 KHz sampling rate supported.
2. 8 to 352 Kbps supported.
3. Limited arithmetic accuracy supported.
4. Objective and subjective testing experience.
5. 16-bit PCM output.

Applications:
1. Portable audio devices
2. Streaming applications

o AAC

AAC (Advance Audio Coding) is MPEG2-7 standard, which is Non-backward compatible with earlier MPEG audio standards. It is found that AAC delivers same quality as MP3 with 25 to 30% reduction in bitrate. That means CD-ROM quality is achievable at around 96 kbps in AAC than 128 kbps in MP3.

JOINT[S] Chips has experience in implementation of Low-complexity profile. It supports basic coding techniques like high-resolution filter banks, non-uniform quantizers, Huffman coding, window switching, in addition to this the following features are supported Improved joint stereo coding, Coupling channel, Temporal Noise Shaping which provides improvements in quality over MP3 at same bitrate.

Specifications:
1. 8 to 96 KHz sampling rate supported.
2. Stereo channels are supported.
3. Encoding at 16 - 576 kbps stream.
4. Limited arithmetic accuracy supported.
5. Objective and subjective testing experience.
6. 16-bit PCM output.

Applications:
1. Digital audio players.

o AC-3

Audio Coding – 3 is a propriety audio codec developed by Dolby Labs. It is a perceptual audio codec, developed for the 320 kb/s for High-Definition Television (HDTV) standard and also widely adopted in DVD film. AC-3 carries 5.1 channels of audio (left, center, right, left surround, right surround, and a subwoofer), but it has also been designed for compatibility with conventional mono, stereo, and matrixed multi-channel sound systems. A modified Discrete Cosine Transform (MDCT) filterbank is used to decompose audio signal. Transform spectrums are quantized using a psychoacoustically derived dynamic bit allocation scheme. Spectral information obtained from the MDCT is encoded using a novel mantissa/ exponent coding scheme.

Specifications:
1. Single channel to 5.1 channels Implementation.
2. Bitstream supported 32kbps to 640kbps.
3. Sampling rates 32KHz, 44.1KHz and 48KHz.
4. Decoded output in 16 bits.

Applications:
1. DVD Players
2. Home Theater Systems
3. HDTV

Image Codecs:

o JPEG

Implementation of ISO/IEC-10918-1 | ITU-T Recommendation T.81. JPEG is lossy compression/ decompression based DCT process.

Specifications:
1. Baseline sequential DCT based.
2. 8-bit sample precision
3. Three components (YcrCb)
4. 2-AC and 2-DC Huffman Tables
5. Four Quantization Tables.
6. 8K x 8K Image size.

Only subjective testing assesses the quality.

Video Codec:

o H.264

H.264 is the latest video coding standard developed by combined efforts of ISO/IEC and ITU. Based on ITU-T H.264 recommendation | ISO/IEC 14496-10 also known as Advanced Video Coding standard.

H.264 offers nearly 50% reduction in bitrate as compared to MPEG2 video coding with same output quality. Error resilience and network friendliness makes it an ideal choice for mobile video applications.

JOINT[S] Chips Technologies has experience in baseline profile of H.264 specifications.

Technical Specifications:
1. QCIF resolution supported.
2. Conformance using ITU-T supplied test vectors.
3. Bit-stream interface at the NAL (Network Adaptation Layer) unit level.
4. 4:2:0 planar YUV output format.

Applications of Baseline Profile:
1. Video applications for hand held mobile devices.
2. Portable media player or jukebox
3. Surveillance camera
4. Video Conferencing.
5. Videophone.