Low-cost high-power digital cordless telephone architecture

• US 20050227715A1
• Filed: 08/20/2003
• Published: 10/13/2005
• Est. Priority Date: 08/22/2002
• Status: Abandoned Application

• Current Assignee: Thomson Licensing SA (Vantiva SA)
• Original Assignee: Thomson Licensing SA (Vantiva SA)
• Inventors: Kechkaylo, David Lee, Riedl, Wilhelm Ernst, Lai, Hung Chi
• Application Number:
  US10/524,898
• Publication Number:
  US 20050227715A1
• Time in Patent Office: Days
• US Class Current: 455/462
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04M 1/72502 with one base station connected to a single line
• CPC Class Codes: H04M 2250/02 including a Bluetooth interface
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

There is provided a digital, non-spread spectrum, cordless telephone that includes a baseband circuit and a transceiver. The baseband circuit consists of non-application specific circuitry. The non-application specific circuitry includes Continuous Variable Slope Delta Modulation (CVSD) circuitry for encoding and decoding voice data. The transceiver has Frequency Division Duplex circuitry for transmitting the voice data at a Radio Frequency (RF) transmit power greater than 0 dbm.

Claims

1. A digital, non spread spectrum, cordless telephone, comprising:

a baseband circuit consisting of non-application specific circuitry, the non-application specific circuitry including Continuous Variable Slope Delta Modulation (CVSD) circuitry for encoding and decoding voice data; and

a transmitter having Frequency Division Duplex (FDD) circuitry for transmitting the voice data at a Radio Frequency (RF) transmit power greater than 0 dbm.

2. The digital cordless telephone of claim 1, wherein said transmitter limits the Power Spectral Density (PSD) of voice data transmissions to +8 dbm in any 3 kHz bandwidth.

3. The digital cordless telephone according to claim 1, wherein said baseband circuit further comprises:

a self-synchronizing scrambler for scrambling the voice data; and

a self-synchronizing de-scrambler for unscrambling the voice data.

4. The digital cordless telephone according to claim 1, wherein said scrambler and de-scrambler each comprise a polynomial generator.

5. The digital cordless telephone according to claim 1, wherein said baseband circuit further comprises a clock recovery circuit for generating a clock recovery signal based on an Exclusive-OR logic operation performed on the voice data and a time-delayed version of the voice data, the clock recovery signal consisting of a plurality of pulses aligned with rising and falling edges of the voice data.

6. The digital cordless telephone according to claim 1, wherein said transmitter complies with Federal Communications Commission (FCC) Part 15 rule change.

7. A method for transmitting voice data by a digital cordless telephone, comprising the steps of:

encoded voice data using Variable Slop Delta Modulation;

scrambling the encoded voice data using a non Spread Spectrum Technology (SST); and

transmitting the scrambled voice data using Frequency Division Duplex (FDD) and at a Radio Frequency (RF) transmit power greater than 0 dbm.

8. The method of claim 7, wherein said transmitting step limits the Power Spectral Density (PSD) of the transmitted scrambled voice data to +8 dbm in any 3 kHz bandwidth.

9. The method of claim 7, wherein said transmitting step complies with Federal Communications Commission (FCC) Part 15 rule change.