Koninklijke Philips Corporation N.V.

Vlsi Technology, Inc.

Rita Lagomarsino

Laurent Winckel

Denis Archambaud

Oliver Weigelt

Patrick Feyfant

Varenka Martin

Satoshi Yoshida

Philippe Gaglione

Phillippe Gaglione

Voice recording and playback mode using the G.726 half-rate within the personal handy phone system (PHS). When a portable station within the PHS operates as a voice recorder (e.g., functioning as an answering machine), a cost effective system in accordance with the present invention is adapted to compress and store received voice/sound signals in order to increase the usage of limited memory resources provided within the portable station. The present invention also enables previously compressed and stored voice/sound signals to be decompressed and played back in various portable station playback modes. Specifically, the portable station receives a voice/sound signal in a full rate (e.g., 32 kilobits-per-second) 4-bit adaptive differential pulse code modulation (ADPCM) data format in compliance with the International Telecommunication Union (ITU) recommendation G.726. The present invention compresses this received voice/sound signal to a half rate (16 kilobit-per-second) 2-bit ADPCM data format in compliance with the ITU recommendation G.726 in order to increase the usage of the limited memory resources provided within the portable station. During a playback mode of the portable station, the present invention decompresses the previously compressed and stored voice/sound signal to facilitate its playback.

Voice recording and playback mode using the G.726 half-rate within the personal handy phone system

The present invention provides data communication devices, personal handy-phone system base stations, and methods of communicating data. One embodiment of the present invention provides a data communication device including: a transceiver operable to receive wireless signals and recover a baseband signal containing a plurality of first slots from the received wireless signals; a multiple access processor coupled with the transceiver, the multiple access processor being operable to extract data from the first slots and communicate data at a first information transfer rate; a data formatter operable to combine data from plural first slots to form a second slot, the data formatter further being operable to output the second slot at a second information transfer rate; and an interface coupled with the data formatter, the interface being configured for connection with a network and operable to communicate the second slot. Another embodiment of the present invention provides a method of communicating data including: forming a plurality of first slots containing data to be communicated; communicating the first slots including transmitting wireless signals and receiving the wireless signals; extracting the data from the wireless signals at a first information transfer rate following the receiving; combining data from plural first slots following the extracting; forming a second slot using the combined data; and outputting the second slot at a second information transfer rate.

Data communication devices, personal handy-phone system base stations, and methods of communicating data

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Antibes, France

Rita Lagomarsino