Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Michael A. Ramalho is active.

Publication


Featured researches published by Michael A. Ramalho.


international conference on acoustics, speech, and signal processing | 2010

Emerging ITU-T standard G.711.0 — lossless compression of G.711 pulse code modulation

Noboru Harada; Yutaka Kamamoto; Takehiro Moriya; Yusuke Hiwasaki; Michael A. Ramalho; Lorin Netsch; Jacek Stachurski; Lei Miao; Herve Marcel Taddei; Fengyan Qi

The ITU-T Recommendation G.711 is the benchmark standard for narrowband telephony. It has been successful for many decades because of its proven voice quality, ubiquity and utility. A new ITU-T recommendation, denoted G.711.0, has been recently established defining a lossless compression for G.711 packet payloads typically found in IP networks. This paper presents a brief overview of technologies employed within the G.711.0 standard and summarizes the compression and complexity results. It is shown that G.711.0 provides greater than 50% average compression in typical service provider environments while keeping low computational complexity for the encoder/decoder pair (1.0 WMOPS average, <;1.7 WMOPS worst case) and low memory footprint (about 5k octets RAM, 5.7k octets ROM, and 3.6k program memory measured in number of basic operators).


international conference on acoustics, speech, and signal processing | 1994

A new speech enhancement technique with application to speaker identification

Michael A. Ramalho; Richard J. Mammone

Speaker identification (SI) and speech recognition systems display a strong sensitivity to ambient noise conditions. It is known that the performance of these systems is maximized when trained under conditions that approximate the testing environment. However these systems generally do not perform well when there is no noise or when the level or characteristics of the noise changes. A new speech enhancement technique is presented that, when used with a standard cepstrum-based SI system, significantly reduces the sensitivity of the SI system to mismatches in the noise environment between training and testing.<<ETX>>


Archive | 2006

Method and System for Adaptive Media Quality Monitoring

Randall P. J. Ethier; Rajesh Kumar; Robert J. Biskner; Chelliah Nmi Sivachelvan; Mohamed Saad-Eldin Mostafa; Scott S. Firestone; Michael A. Ramalho; Kevin J. Connor; James C. Frauenthal; Michael P. Hammer


Archive | 2004

Multiple personality telephony devices

Michael A. Ramalho; Ramanathan T. Jagadeesan; Bich T. Nguyen


Archive | 2005

Method of moving a transport connection among network hosts

Michael A. Ramalho; Peter Lei; Randall R. Stewart


Archive | 2005

System and method for handling media in a seamless handoff environment

Ramanathan T. Jagadeesan; Bich T. Nguyen; Andrew C. Chung; Michael A. Ramalho


Archive | 2002

Technique for providing multi-homing capability in data networks

Michael A. Ramalho


Archive | 2010

Buffer expansion and contraction over successive intervals for network devices

Ali C. Begen; Tankut Akgul; Michael A. Ramalho; David R. Oran; William C. Ver Steeg


Archive | 2007

Wirelessly-enabled identification of digital media generated at an event

Matthew Kuhlke; Fadi R. Jabbour; Eric H. Lee; David C. Lee; Michael A. Ramalho


Archive | 2007

NETWORK DISCOVERY AND DYNAMIC ADAPTATION OF INSUFFICIENT QOS RESOURCES

Brian Alan Davis; Joseph Roy Stone; Flemming S. Andreasen; Michael A. Ramalho

Collaboration


Dive into the Michael A. Ramalho's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge