Wireless audio
AssigneeKoninklijke Philips Electronics N.V.
InventorRonaldus Aarts
Life of this patent
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Abstract
An audio reproduction system comprises a transmitter device (1) and a receiver device (2). The transmitter device (1) determines the envelope signal of an audio signal (Vin) of a selected frequency range and transmits the envelope signal (VE) over a communication channel (C). The receiver device (2) combines the received envelope signal (VE) with an oscillator signal (VO) to produce a transducer signal. The communication channel (C) is preferably wireless. The transducer (30) is preferably designed to operate at its resonance frequency so as to achieve maximum efficiency.
Claims35
An audio transmission device (1) comprising:
- detector means (12) for detecting the envelope of an audio signal (Vin) and producing a corresponding envelope signal (VE), and
- transmitter means (14) for transmitting the envelope signal.
An audio receiving device (2) comprising:
- receiver means (21) for receiving a transmitted envelope signal (VE), and
- reconstruction means (22, 23) for reconstructing an audio signal on the basis of the envelope signal.
A device (1) for adapting a frequency range of an audio signal to a transducer (30), the device comprising:
- detection means (12) for detecting first signal components in a first audio frequency range (I),
- generator means (23) for generating second signal components in a second audio frequency range (II), and
- control means (22) for controlling the amplitude of the second signal components in response to the amplitude of the first signal components,
- wherein:
- the second audio frequency range (II) is substantially narrower than the first audio frequency range (I),
- the transducer (30) has a maximum efficiency at the second audio frequency range (II), and
- the amplitude of the first signal components is transmitted from the detection means (13) to the control means (21) over a communication link (C).
A method of transmitting an audio signal, the method comprising the steps of:
- detecting the envelope of an audio signal (Vin) and producing a corresponding envelope signal (VE),
- transmitting the envelope signal (VE) using a transmitter (14),
- receiving a transmitted envelope signal using a receiver (21), and
- reconstructing the audio signal on the basis of the envelope signal.
Dependencies are inferred from the claim text.