Digital radio telephone

• US 5,499,286 A
• Filed: 08/13/1993
• Issued: 03/12/1996
• Est. Priority Date: 08/13/1992
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kobayashi, Takeo
• Primary Examiner(s): Coles, Sr., Edward L.
• Assistant Examiner(s): LEE, CHEUKFAN
• Application Number:
  US08/105,952
• Time in Patent Office: 942 Days
• Field of Search: 379/58, 379/63, 379/59, 379/57, 379/61, 34/825.44
• US Class Current: 455/563
• CPC Class Codes: G10L 19/00 Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis in musical instruments G10H
• CPC Class Codes: H04M 1/645 with speech synthesis
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: H04M 2250/56 including a user help function

Abstract

A digital radio telephone gives information to user in speech form by using an advanced speech coder/decoder in a digital radio communication network. Such an advanced coder/decoder can reduce quantity of coded data to be stored. The digital radio telephone according to a first embodiment includes a speech coder/decoder, a speech information memory, a speech information retrieval table, an operational information controller, and a speech information reading section. A plurality of predetermined speech signals are stored in the speech information memory in coded form. The speech information retrieval table stores information for producing a voice message to the user using the items in the speech information memory. To give the voice message to the user, the information is read out by the operational information controller and necessary items of speech signals are read out by the speech information reading section in sequence according to the read information. The speech voice coder/decoder decodes the items so as to produce the voice message in the same way as with digital speech voice signals received by the digital radio telephone. According to a second embodiment, the user can store his own voice into the speech information memory in coded form, and when the user operates the telephone, the user will hear the voice messages in his own voice.

Claims

1. A digital radio telephone comprising:

radio communication means for transmitting and receiving digital speech signals via an antenna;

a speech coder/decoder for generating analog speech signals to a user of the digital radio telephone and said digital speech signals to be transmitted by the radio communication means;

first memory means for storing items of digital speech signals, each of the items having a predetermined speech pattern;

second memory means for storing first information for producing a voice message by using said items of digital speech signals stored in said first memory means;

read control means, responsive to an operation of said user, for controlling reading out of said times of digital speech signals according said first information stored in said second memory means, said speech coder/decoder producing said voice message accordingly; and

switching means for selecting one of said digital speech signals from said radio communication means and said items of the digital speech signals from said first memory means for output to said speech coder/decoder.

2. A digital radio telephone comprising:

radio communication means for transmitting and receiving digital speech signals via an antenna;

a speech coder/decoder for generating analog speech signals to a user of the digital radio telephone and said digital speech signals to be transmitted by the radio communication means;

first memory means for storing items of digital speech signals, each of the items having a predetermined speech pattern;

second memory means for storing first information for producing a voice message by using said items of digital speech signals stored in said first memory means;

read control means, responsive to an operation of said user, for controlling reading out of said times of digital speech signals according said first information stored in said second memory means, said speech coder/decoder producing said voice message accordingly;

write control means, responsive to a user writing operation, for controlling writing of said digital speech signals, which are coded from speech of said user by said speech coder/decoder, into said first memory means; and

switching means for selecting one of said radio communication means and said first memory means to output the digital speech signals of the subscriber coded by the speech coder/decoder.

3. A digital radio telephone comprising:

radio telephone means for transmitting and receiving coded speech signals;

a handset for transmitting and receiving analog speech signals;

a speech coder/decoder for decoding and sending out coded speech signals from said radio telephone means to said handset, and coding and sending out analog speech signals from said handset to said radio telephone means;

operational means for inputting a plurality of items of operational information;

a speech information memory for storing a predetermined number of items of coded speech information;

a speech information retrieval table for storing the number of items of coded speech information, each corresponding to one of said plural items of operational information, and the initial address of each position in a predetermined sequence in which the items of coded speech information are read out of said speech information memory;

speech information reading means for reading out said coded speech information from said speech information memory according to said initial address retrieved from the speech information retrieval table;

switching means for selectively outputting the coded speech information from said speech information reading means and coded speech signals from said radio telephone means to said speech coder/decoder; and

operational information control means for controlling said speech information retrieval table, said speech information reading means and said switching means in accordance with said inputted operational information from said operational means.

4. A digital radio telephone comprising:

radio telephone means for transmitting and receiving coded speech signals;

a handset for transmitting and receiving analog speech signals;

a speech coder/decoder for decoding and sending out coded speech signals from said radio telephone means to said handset, and coding and sending out analog speech signals from said handset to said radio telephone means;

operational means for inputting first and second pluralities of items of operational information;

a speech information memory for storing a predetermined plurality of items of coded speech information and digital speech signals coded by the speech coder/decoder;

a speech information retrieval table for storing, together with the number of items of coded speech information, each corresponding to one of said first plurality of items of operational information, and the initial address of each position in a predetermined sequence in which the items of coded speech information are read out of said speech information memory, writing sequence information for said digital speech signals according to said second plurality of items of operational information, inputted from said operational means, and the initial addresses and the final addresses of storage areas in said speech information memory corresponding to the writing sequence information;

speech information reading/writing means for reading out said coded speech information from said speech information memory and said digital speech signals, and for writing said digital speech signals into said speech information memory;

first switching means for selectively outputting one of the coded speech information from said speech information reading/writing means and the coded speech signals from said radio telephone means to the speech coder/decoder;

second switching means for selectively outputting said digital speech signals from said speech coder/decoder to one of said radio telephone means and said speech information reading/writing means; and

operational information control means, responsive to an output of said operational means, for controlling said speech information retrieval table, said speech information reading/writing means, and said first and second switching means.