Pulse or digital communications – Pulse code modulation – Differential
Patent
1997-07-07
2000-05-16
Le, Amanda T.
Pulse or digital communications
Pulse code modulation
Differential
375295, 375316, 455102, 455103, 704500, H04B 1406
Patent
active
060646993
ABSTRACT:
A wireless speaker system that transmits and receives both analog and digital audio signals simultaneously over a single channel at frequencies above 900 MHz. The present invention advantageously uses continuously variable slope delta (CVSD) modulation to perform analog-to-digital (A/D) and digital-to-analog (D/A) conversion of audio signals in the transmitter and receiver, respectively, using complementary filters and CVSD modulation circuits in both the transmitter and receiver. Analog signals are modulated in the transmitter with a high-frequency carrier and band-pass filtered before being combined with the digitized audio signal to modulate a high-frequency carrier, i.e. over 900 MHz, which is transmitted to the receiver. Similarly, the receiver band-pass filters and demodulates the received signal to recover the analog signal components.
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Golden Eagle Electronics Manufactory Ltd.
Ha Dac V.
Le Amanda T.
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