US4215431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wireless transmission system
Assignee: Individual
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Filing: 1978-10-12
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Granted: 1980-07-29
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Expires: 1998-10-12
Abstract
Abstract A wireless transmission system for substantially noise-free transmission including a portable, battery powered, self contained transmitter for transmitting signals representative of an audio input to a remote receiver. The transmitter includes noise reduction encoding circuitry for processing a transduced audio input signal and providing a processed output signal to a transmission unit for transmission to the remote receiver. The remote receiver receives the transmitted signals and supplies the received signals to a reception unit including noise reduction decoding circuitry for processing the received signal and providing an audio signal output with improved signal to noise ratio to a utilization device.
Inventors
- 👤 John Nady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:03
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/62
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
214 words
A wireless, portable, self-contained transmission system for use with at least one of microphone transducers and musical instrument transducers receiving an audio input and providing a transduced audio signal, said transmission system comprising a portable, battery powered, self-contained transmitter means for transmitting compressed signals to a remote receiver means, said transmitter means including noise reduction compression means responsive only to the transduced audio signal for compressing the transduced audio signal and providing a compressed output signal to a transmission means for transmission to said remote receiver means, said remote receiver means receiving the transmitted compressed signals and supplying a compressed transduced audio signal to noise reduction expansion means corresponding to said noise reduction compression means of said transmitter means, said noise reduction expansion means expanding the transmitted compressed signals for providing an audio output signal with an improved signal to noise ratio to a utilization means whereby substantially noise-free transmission is effected, said noise reduction compression means including amplifier means responsive to the transduced audio signal, variable gain means connected in a feedback path of said amplifier means, said variable gain means having the gain thereof controlled by average value detector means, wherein said average value detector means being driven by an output from a preemphasis means receiving an output of said amplifier means.
Claim 2
Dependent Claim
214 words
A wireless, portable, self-contained transmission system for use with at least one of microphone transducers and musical instrument transducers receiving an audio input and providing a transduced audio signal, said transmission system comprising a portable, battery powered, self-contained transmitter means for transmitting compressed signals to a remote receiver means, said transmitter means including noise reduction compression means responsive only to the transduced audio signal for compressing the transduced audio signal and providing a compressed output signal to a transmission means for transmission to said remote receiver means, said remote receiver means receiving the transmitted compressed signals and supplying a compressed transduced audio signal to noise reduction expansion means corresponding to said noise reduction compression means of said transmitter means, said noise reduction expansion means expanding the transmitted compressed signals for providing an audio output signal with an improved signal to noise ratio to a utilization means whereby substantially noise-free transmission is effected, said noise reduction compression means including amplifier means responsive to the transduced audio signal, variable gain means connected in a feedback path of said amplifier means, said variable gain means having the gain thereof controlled by average value detector means, wherein said average value detector means being driven by an output from a preemphasis means receiving an output of said amplifier means.
Claim 3
Dependent Claim
52 words
A wireless transmission system according to claim 1, wherein said preemphasis means provides mid band preemphasis in the 400 Hz to 3000 Hz frequency range, and further comprising additional mid band preemphasis means providing preemphasis in the 400 Hz to 3000 Hz frequency range coupled to an input of said amplifier means.
Claim 4
Dependent Claim
17 words
A wireless transmission system according to claim 2, wherein said noise reduction compression means includes integrated circuits.
Claim 5
Dependent Claim
50 words
A wireless transmission system according to claim 2, wherein said noise reduction expansion means includes a variable gain means for receiving the compressed, transduced signals, average value detector means for controlling the gain of said variable gain means and being driven by a preemphasis means receiving the compressed, transduced signals.
Claim 6
Dependent Claim
193 words
A wireless, portable, self-contained transmission system for use with at least one of microphone transducers and musical instrument transducers receiving an audio input and providing a transduced audio signal, said transmission system comprising a portable, battery powered, self-contained transmitter means for transmitting compressed signals to a remote receiving means, said transmitter means including noise reduction compression means responsive only to the transduced audio signal for compressing the transduced audio signal and providing a compressed output signal to a transmission means for transmission to said remote receiving means, said remote receiver means receiving the transmitted compressed signals and supplying a compressed transduced audio signal to noise reduction expansion means corresponding to said noise reduction compression means of said transmitter means, said noise reduction expansion means expanding the transmitted compressed signals for providing an audio output signal with an improved signal to noise ratio to a utilization means whereby substantially noise-free transmission is effected, said noise reduction expansion means including a variable gain means for receiving the transmitted compressed signals, average value detector means for controlling the gain of said variable gain means and being driven by a preemphasis means receiving the transmitted compressed signals.
Claim 7
Dependent Claim
193 words
A wireless, portable, self-contained transmission system for use with at least one of microphone transducers and musical instrument transducers receiving an audio input and providing a transduced audio signal, said transmission system comprising a portable, battery powered, self-contained transmitter means for transmitting compressed signals to a remote receiving means, said transmitter means including noise reduction compression means responsive only to the transduced audio signal for compressing the transduced audio signal and providing a compressed output signal to a transmission means for transmission to said remote receiving means, said remote receiver means receiving the transmitted compressed signals and supplying a compressed transduced audio signal to noise reduction expansion means corresponding to said noise reduction compression means of said transmitter means, said noise reduction expansion means expanding the transmitted compressed signals for providing an audio output signal with an improved signal to noise ratio to a utilization means whereby substantially noise-free transmission is effected, said noise reduction expansion means including a variable gain means for receiving the transmitted compressed signals, average value detector means for controlling the gain of said variable gain means and being driven by a preemphasis means receiving the transmitted compressed signals.
Claim 8
Dependent Claim
39 words
A wireless transmission system according to claim 4 or 5, wherein said preemphasis means of said expansion means provides preemphasis in the 400 Hz to 3000 Hz frequency range, said variable gain means providing an output to amplification means.
Claim 9
Dependent Claim
39 words
A wireless transmission system according to claim 6, wherein said noise reduction expansion means further includes mid band deemphasis means coupled to said amplification means for providing mid band deemphasis in the 400 Hz to 3000 Hz frequency range.
Claim 10
Dependent Claim
17 words
A wireless transmission system according to claim 7, wherein said noise reduction expansion means includes integrated circuits.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |