WO1991007827A1 - Dispositifs de communication a egalisation dynamique - Google Patents

Dispositifs de communication a egalisation dynamique Download PDF

Info

Publication number
WO1991007827A1
WO1991007827A1 PCT/US1990/006042 US9006042W WO9107827A1 WO 1991007827 A1 WO1991007827 A1 WO 1991007827A1 US 9006042 W US9006042 W US 9006042W WO 9107827 A1 WO9107827 A1 WO 9107827A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
processing
received
receiving
power
Prior art date
Application number
PCT/US1990/006042
Other languages
English (en)
Inventor
Bruce W. Staple
King Lee
Karl R. Weiss
Clifford A. Wood
Zaffer S. Merchant
Bernard A. Schnaufer
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Publication of WO1991007827A1 publication Critical patent/WO1991007827A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity

Definitions

  • This invention relates generally to receiver and transmitter systems, more specifically to radio frequency (RF) receivers and transmitters designed to dynamically control and improve an audio spectrum to render a clear intelligible signal.
  • RF radio frequency
  • Background RF receivers generally lack the ability to adequately compensate for audio signals received and sent in diverse environments. This results in poor audio transmission and reception, and generally provides poor overall intelligibility. Filters, and more particularly graphic equalizers, designed to compensate for undesired characteristics may improve an audio transmission or reception for a particular environment, but cannot instantaneously compensate and improve a signal in changing environments.
  • Contemporary two-way radio transceivers also lack the ability to continuously adjust to diverse environments when transmitting an information signal. Accordingly, a need exists for a radio receiver and transmitter system that dynamically compensates and improves radio signals in diverse environments. Summary of the Invention
  • radio frequency signals are received and analyzed to provide signals representative of signal power in several frequency bands.
  • the signals representative of signal power are then processed.
  • control signals are sent to a signal adjusting device that adjusts the received radio frequency signals in accordance with the control signals to provide a recovered signal.
  • This process provides dynamic spectral corrections that are updated by a processing means.
  • radio frequency signals are again received and analyzed to provide signals representative of signal power in several frequency bands to a processing means. Instructions given by a user interface coupled to the processing means along with respective signals representative of the signal power allows the processing means to provide control signals to a signal adjusting device.
  • the signal adjusting device receives the received signal and modifies it in accordance with the control signal and instructions provided through the user interface to provide a recovered signal.
  • instructions given by a user interface overrides the control signals provided to the processing means.
  • the signal adjusting device receives the received signal and modifies it solely in accordance with the instructions provided by the user interface to provide a recovered signal.
  • Figure 1 is a schematic block diagram of a receiver in accordance with the present invention.
  • Figure 2 is an illustration of a two-way radio in accordance with the present invention.
  • Figure 3 is a schematic block diagram of a real time analyzer.
  • Figure 4 is a schematic block diagram of a graphic equalizer.
  • Figure 5 is a schematic block diagram of a transmitter in accordance with the present invention.
  • Figure 6 is a flow chart in accordance with the present invention.
  • Figure 7 is a flow chart in accordance with the present invention.
  • FIG. 1 there is shown a block diagram of a receiver circuit 100 in accordance with the present invention.
  • an antenna (1 ) receives an information signal.
  • the information signal typically a radio frequency (RF) signal
  • the mixed information signal passes through a filter 4 to provide a received signal to a real time analyzer 7 and to a graphic equalizer 5.
  • the real time analyzer 7 preferably determines the peak power in given frequency band ranges, preferably the (11 1/3 Octave International Standards Organization's) (ISO's) standard frequencies (i.e., 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1 KHz, 1.25KHZ, 1.6KHz, 2.0KHz, 2.5KHz, and 3.15KHz).
  • a microprocessor 8 compares the signal representative of the power in each frequency band range provided by the real time analyzer with the one or more power levels (stored in memory 12) that represent an ideal spectral response.
  • the microprocessor 8 determines the difference between the power in each frequency band range and the one or more power levels stored in memory 12 to automatically provide the graphic equalizer 5 with a control signal 14 representative of the difference in power.
  • the graphic equalizer 5 adjusts the received signal in accordance with the control signal, providing an recovered signal.
  • an amplifier 10 amplifies the recovered signal providing an amplified recovered signal to a speaker 11.
  • a transducer 6, could optionally be utilized in receiver 100 to sample the acoustic environment (sounds or noise) a user will typically encounter during daily use of the receiver.
  • the transducer 6 would assist a user in interactively adjusting the power levels for the different frequency bands as discussed below.
  • the microprocessor 8 in the receiver 100 determines the difference between the power in each frequency band and the power levels for each frequency band selected by a user through a user interface, preferably a keypad arrangement 20. The user can manually adjust the frequency power spectrum rather than using a pre-defined adjustment through memory 12.
  • the microprocessor 8 in the receiver 100 determines the difference between the power in each frequency band range and the power levels stored in memory 12 to provide the graphic equalizer 5 with a control signal representative of the difference in power.
  • this alternative embodiment allows for a user to override the pre-defined settings in memory 12 by interactively or manually "fine tuning" or adjusting the power levels for each frequency band through a user interface, preferably a keypad arrangement.
  • the two-way radio 200 preferably comprises of adjustment knobs 26 for setting channels and volume generally, an antenna 25, a battery 24, and a speaker 23 of conventional design. Also included are user interfaces preferably comprising keypad arrangements 20 and 22, and a liquid crystal display 21. When the present invention adjusts the power in each frequency band automatically, the two- way radio 200 can function without the user interfaces 20, 21 , and 22. Conversely, when two-way radio 200 solely operates in "manual" or "hybrid” mode, all the user interfaces could be utilized. Setting the two-way radio 200 in manual mode using the keypad 22, would allow a user to adjust the power in a given frequency to his desire using keypad 20. In the "hybrid" interactive mode, where the user can override the pre-defined power adjustment, the liquid crystal display 21 provides visual feedback of the power levels for each frequency band to the user in order to fine tune the two-way radio 200.
  • the real time analyzer 7 comprises a bank of filters (30) that receive an information signal from the filter 4 in Figure 1.
  • Each filter 30 preferably filters the frequency band respective to the given ranges provided by the International Standards Organization (ISO).
  • the received signal can be clock triggered (34 & 36) through the bank of filters 30 to provide a filtered information signal to a bank of power detectors (32).
  • the power detectors (32) preferably provide a root-mean-square (RMS) signals to a analog-to-digital convenor 38.
  • the analog-to- digital convenor 38 converts the RMS signal to a digitized representation of the signal power and provides a digital RMS signal to the microprocessor 8.
  • the graphic equalizer 5 comprises a bank of filters (40) that receives an information signal at an input (46) and a control signal from a microprocessor (8) and a microprocessor interface (44).
  • Each filter (40) preferably adjusts the frequency bands respective to the 11 given ranges provided by the ISO.
  • the control signal directs each filter in the bank of filters (40) to either attenuate or boost the power in their respective frequency band range.
  • the microprocessor 8 calculates the difference between the power in each frequency band range and the power levels stored in memory 12 (see Figure 1 ) or the power levels provided through a user interface (see Figure 2) to provide the graphic equalizer 5 with a control signal representative of the difference in power.
  • a buffer 42 receives the attenuated or boosted received signal before the graphic equalizer 5 provides an adjusted recovered signal to the output 47.
  • a transmitter 50 includes a transducer (6) that receives an information signal, typically a voice signal, providing a transmit signal to a graphic equalizer 5 and a real time analyzer 7.
  • the microprocessor 8 in transmitter 50 compares the signal representative of the power in each frequency band range provided by the real time analyzer 7 with the power level stored in memory or with the power level provided by a user through a user interface.
  • the microprocessor 8 determines the difference between the power in each frequency band range and the power levels stored in memory or provided by a user to provide the graphic equalizer 5 with a control signal representative of the difference in power.
  • the graphic equalizer 5 adjusts the transmit signal in accordance with the control signal, providing an processed signal.
  • an transmitter 52 transmits the processed signal through a switching device 54 and an antenna 1.
  • a flow chart (60) describes the method used in the present invention to dynamically equalize transceivers.
  • the signal strength of a received signal in each given bandwidth must be determined (61 ).
  • the signal strength representative of the received signal is preferably converted from an analog to a digital signal (63).
  • the signal strength is compared to the strength level in a pre-defined window or spectrum range (65) preferably stored in memory.
  • the signal strength of the received signal can be compared to the defined signal strength range set by a user.
  • the signal strength of the received signal is adjusted (67).
  • the signal strength for a given frequency is attenuated (70) if it is above the pre-defined window (or range) setting or user inputed setting.
  • the signal strength for a given frequency is boosted (72) if it is below the pre-defined window setting or user inputed setting. If the signal strength representative of the received signal fits within the pre-defined window (69), the entire frequency spectrum signal is amplified (76) for the output (78) without any given frequency being either boosted (72) or attenuated (70). If the signal strength for a given frequency is either boosted (72) or attenuated (70) then the signal would be subsequently amplified (76) for the output (78).
  • DSP Digital Signal Processing
  • DSP would allow the present invention to keep all signals in the digital domain and reduce the need for analog-to-digital or digital-to-analog conversion until the signal is ready for the final output stage.
  • Using DSP allows for greater control and manipulation of the received signal and further allows for the removal of certain hardware such as D-to-A and A-to-D convertors and switch capacitors that occupy greater amounts of space on a printed circuit board than their digital (or software) counterparts.
  • a flow chart 80 reveals the software routine utilized to analyze and adjust the signal strength of a received signal in order to fit a pre-defined range in signal strength for particular frequencies, more specifically, for the 11 1/3 octave ISO frequencies.
  • the routine idles, until a received signal is ready " to be sampled (82).
  • the timing loop variables are reset (84) to establish a sampling rate that is sufficiently high to eliminate user perceived changes in the audio signal.
  • the signal strength from the peak detectors (not shown) in the real time analyzer is determined (86).
  • the difference between the respective signal strengths for each frequency band from the peak detectors and the signal strength "window" or shape stored in memory (or user inputed) is determined (88) to adjust the graphic equalizer settings in each band accordingly (90).
  • the graphic equalizer adjusts to new settings (92)
  • the transceiver continues to sample for another received signal. What is claimed is:

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Des signaux de haute fréquence sont reçus (1) et analysés (7) afin de fournir des signaux représentatifs de la puissance des signaux dans une pluralité de bandes de fréquence à un microprocesseur (8). Le microprocesseur (8) envoie des signaux de commande à un dispositif (5) d'ajustement des signaux qui ajuste les signaux de haute fréquence reçus selon les signaux de commande reçus du microprocesseur (8) afin de générer un signal récupéré. Ce procédé implique des corrections spectrales dynamiques qui sont constamment mises à jour par le microprocesseur (8). Dans un autre mode de réalisation de l'invention, les instructions transmises par une interface (9) avec l'utilisateur modifient entièrement ou en partie les signaux de commande transmis au microprocesseur (8).
PCT/US1990/006042 1989-11-16 1990-10-22 Dispositifs de communication a egalisation dynamique WO1991007827A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43714489A 1989-11-16 1989-11-16
US437,144 1989-11-16

Publications (1)

Publication Number Publication Date
WO1991007827A1 true WO1991007827A1 (fr) 1991-05-30

Family

ID=23735264

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/006042 WO1991007827A1 (fr) 1989-11-16 1990-10-22 Dispositifs de communication a egalisation dynamique

Country Status (1)

Country Link
WO (1) WO1991007827A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4405836A (en) * 1982-01-04 1983-09-20 Motorola, Inc. Signal equalization selector
US4661982A (en) * 1984-03-24 1987-04-28 Sony Corporation Digital graphic equalizer
US4688258A (en) * 1984-10-31 1987-08-18 Pioneer Electronic Corporation Automatic graphic equalizer
US4868881A (en) * 1987-09-12 1989-09-19 Blaupunkt-Werke Gmbh Method and system of background noise suppression in an audio circuit particularly for car radios
US4870690A (en) * 1985-09-10 1989-09-26 Canon Kabushiki Kaisha Audio signal transmission system
US4955058A (en) * 1987-01-29 1990-09-04 Eugene Rimkeit Apparatus and method for equalizing a soundfield

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4405836A (en) * 1982-01-04 1983-09-20 Motorola, Inc. Signal equalization selector
US4661982A (en) * 1984-03-24 1987-04-28 Sony Corporation Digital graphic equalizer
US4688258A (en) * 1984-10-31 1987-08-18 Pioneer Electronic Corporation Automatic graphic equalizer
US4870690A (en) * 1985-09-10 1989-09-26 Canon Kabushiki Kaisha Audio signal transmission system
US4955058A (en) * 1987-01-29 1990-09-04 Eugene Rimkeit Apparatus and method for equalizing a soundfield
US4868881A (en) * 1987-09-12 1989-09-19 Blaupunkt-Werke Gmbh Method and system of background noise suppression in an audio circuit particularly for car radios

Similar Documents

Publication Publication Date Title
US5745856A (en) Radio receiver for demodulating both wideband and narrowband modulated signals
US6246885B1 (en) Digital FM audio processing in a dual-mode communication system
KR100443703B1 (ko) 무선수신기의오디오응답동적변경방법및장치
US7133529B2 (en) Howling detecting and suppressing apparatus, method and computer program product
EP0560599B1 (fr) Appareil pour supprimer du bruit
US5394475A (en) Method for shifting the frequency of signals
US4736432A (en) Electronic siren audio notch filter for transmitters
CN101034899B (zh) 基于单通道的民航地空通信自适应干扰抑制方法及其系统
JPH02503977A (ja) 低電力デジタル受信機
US20020071583A1 (en) Digital hearing device, method and system
CN101505443A (zh) 一种虚拟重低音增强方法及系统
US5430894A (en) Radio receiver noise suppression system
US4255620A (en) Method and apparatus for bandwidth reduction
US5323332A (en) Instrument landing system calibrator
JP6892598B2 (ja) ノイズ抑圧回路、ノイズ抑圧方法、および、プログラム
US6970558B1 (en) Method and device for suppressing noise in telephone devices
CA2402428A1 (fr) Emetteur-recepteur sans fil a filtre soustractif de compensation d'elements de transmission et de reception
JPH0934496A (ja) ノイズのある音声信号を改善するための装置
CN101174842B (zh) 民航地空通信中单通道最优恒模干扰抑制方法及其系统
WO1991007827A1 (fr) Dispositifs de communication a egalisation dynamique
US5042085A (en) Radio frequency data communication band pass filter
WO2015165076A1 (fr) Procédé et appareil de différenciation de signaux vocaux
JP2002521945A (ja) 通信端末
US5983085A (en) Method and apparatus that compensates for output power variations in a transmitter by using scaling factors to scale the baseband input signal
US5410741A (en) Automatic gain control of transponded supervisory audio tone

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU NL SE