WO2008146183A1 - Device and method to reduce power consumption - Google Patents

Device and method to reduce power consumption Download PDF

Info

Publication number
WO2008146183A1
WO2008146183A1 PCT/IB2008/051581 IB2008051581W WO2008146183A1 WO 2008146183 A1 WO2008146183 A1 WO 2008146183A1 IB 2008051581 W IB2008051581 W IB 2008051581W WO 2008146183 A1 WO2008146183 A1 WO 2008146183A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
stage
perceivable
human listener
electronic device
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB2008/051581
Other languages
French (fr)
Inventor
Ton Huijnen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NXP BV
Original Assignee
NXP BV
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 NXP BV filed Critical NXP BV
Publication of WO2008146183A1 publication Critical patent/WO2008146183A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/665—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect

Definitions

  • the invention relates to an electronic device and a method to reduce power consumption in audio rendering devices.
  • Some of the known audio compression techniques use so-called psycho- acoustic masking effects and technologies to determine frequency bands in an audio signal that are not perceived or perceivable by the human auditory perceptual system. Since the human auditory perceptual system is the combination of ear and brain, the known techniques especially try to identify frequency bands that people normally can not hear.
  • Such known audio compressing techniques code these frequency bands with less bits and thus increases the quantisation noise of the mentioned frequency bands.
  • the technique to reduce the data information of selected frequency bands still causes power consumption in audio rendering devices since the frequency bands do have a data content which has to be read and handled.
  • WO 2005/071830 Al discloses a system for audio signal processing comprising high pass and low pass filters. This system does not provide an effective filtering to effectively reduce the power consumption.
  • US 2006/0023907 Al discloses a power saving mode for hearing aids comprising a high pass filter and again this document does not disclose a system with an effective reduction in power consumption.
  • an electronic device especially an audio rendering device, including an input stage, and an output stage, comprising furthermore a stage to analyse the signal content of the signal to identify the parts of a signal not perceivable by a human listener and a alteration stage to delete the parts of the signal identified as not perceivable by a human listener.
  • the analysing stage and the alteration stage are included within the electronic device.
  • the analysing stage includes a psycho-acoustic model to identify signal content not perceivable by a human listener. And additionally it is advantageous that the psycho-acoustic stage identifies a signal content as not perceivable by a human listener if a part of a signal falls below a predefined threshold.
  • the problem according to the method will be solved using a method of reducing the signal content of an electronic signal of an audio rendering device to reduce power consumption
  • the electronic device comprises an input stage, and an output stage
  • the device comprises furthermore a stage to analyse the signal content of the signal to identify the parts of a signal not perceivable by a human listener and a alteration stage to delete the parts of the signal identified as not perceivable by a human listener, wherein the analysing stage analyses the signal and identifies a signal content that is not perceivable by a human listener and the alteration stage deletes the identified signal content as being identified as not perceivable by an human listener.
  • the analysing stage uses a psycho-acoustic model to identify signal content not perceivable by a human listener. Additionally it is of advantage that the psycho-acoustic stage identifies a signal content as not perceivable by a human listener if a part of a signal falls below a predefined threshold.
  • Fig. 1 shows a schematic view of an inventive device and Fig. 2 shows a diagram of an inventive method.
  • Figure 1 shows a schematic view of the device 1 according to the invention.
  • An audio rendering device 1 comprises different stages of signal processing.
  • a signal processing chain there is an input stage 2, one or more signal processing stages 4 and an output stage 3.
  • stage 4 represents the last stage of normal signal processing in the normal signal processing path.
  • the input and output stages as well as the signal processing stages can be analogue or digital and in the embodiment of Figure 1 the device has digital signal processing stages and therefore the audio signal between the last processing stage 4 and the output stage is a digital signal.
  • the output stage can be a digital stage or a Digital-to-Analogue converter.
  • Stage 5 is a stage or device to analyse the signal content of the incoming signal
  • stage or device 6 is responsible to change the signal content of the signal 7.
  • the analysis part of said stage 5 consists of a psycho-acoustic model which identifies the signal content that will not be perceivable by a human listener.
  • the threshold of what is perceivable and what is not perceivable can be adjusted by the operator or can be adjusted according to the abilities of the normal human listeners.
  • the inventive device 1 After having identified parts of the signal not perceivable by human listeners, the inventive device 1 deletes the respective signals.
  • the parts of the signals left out will lead to a significant reduction of the power consumption of the audio system compared to the technique of only reducing the data contend and to increase the quantisation noise of such parts of the signal, since these signals have to be transmitted anyway and according to the present invention, the deleted parts of the signal will not lead to power consumption. Therefore the over all power consumption will be reduced.
  • the psycho-acoustic model may be implemented such that the system comprises a transformation of signals to the frequency domain, followed by application of a predetermined masking threshold to the transformed signal. In case that a part of a signal falls below the threshold this part of the signal will be accepted and marked as imperceptible by a human listener.
  • stage 6 the device alters the signal content of the incoming signal.
  • the signal content that will not be perceived by a human listener are removed from the signal.
  • the signal After the alteration and the deletion of the non perceivable parts of the signal, the signal will be transformed back to the time domain and outputted by the output block 3.
  • the device may use the psycho-acoustic model from the audio encoder or the device may be in signal communication with a stand-alone device comprising the psycho-acoustic model to analyse a signal and to alter a signal according to the invention.
  • Figure 2 displays the method 10 according to the invention by way of an embodiment.
  • the signal is transferred to the frequency domain.
  • the analysing stage analyses in block 12 the signal content of the signal and identifies the parts of the signal not perceivable by the human listener.
  • This signal is transferred to the alteration stage and the alteration stage deletes the part of the signal or the signal content not perceivable by the human listener, see block 13.
  • Block 15 in between 13 and 14 transforms the signal back from the frequency domain to the time domain. In block , the remaining signal is outputted at the output.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Computational Linguistics (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Function (AREA)

Abstract

The invention relates to a method and a device (1), especially an audio rendering device, including an input stage (2), and an output stage (3), comprising furthermore a stage (5) to analyse the signal content of the signal to identify the parts of a signal not perceivable by a human listener and a alteration stage (6) to delete the parts of the signal identified as not perceivable by a human listener.

Description

DEVICE AND METHOD TO REDUCE POWER CONSUMPTION
FIELD OF THE INVENTION
The invention relates to an electronic device and a method to reduce power consumption in audio rendering devices.
BACKGROUND OF THE INVENTION
Some of the known audio compression techniques use so-called psycho- acoustic masking effects and technologies to determine frequency bands in an audio signal that are not perceived or perceivable by the human auditory perceptual system. Since the human auditory perceptual system is the combination of ear and brain, the known techniques especially try to identify frequency bands that people normally can not hear.
Such known audio compressing techniques code these frequency bands with less bits and thus increases the quantisation noise of the mentioned frequency bands.
The technique to reduce the data information of selected frequency bands still causes power consumption in audio rendering devices since the frequency bands do have a data content which has to be read and handled.
WO 2005/071830 Al discloses a system for audio signal processing comprising high pass and low pass filters. This system does not provide an effective filtering to effectively reduce the power consumption.
US 2006/0023907 Al discloses a power saving mode for hearing aids comprising a high pass filter and again this document does not disclose a system with an effective reduction in power consumption.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the invention to create an electronic device and a method to minimise the power consumption of audio rendering devices.
The above mentioned problems will be solved with the features of claim 1 and/or claim 6 accordingly. Therefore the problem according to the device will be solved using an electronic device, especially an audio rendering device, including an input stage, and an output stage, comprising furthermore a stage to analyse the signal content of the signal to identify the parts of a signal not perceivable by a human listener and a alteration stage to delete the parts of the signal identified as not perceivable by a human listener.
According to the invention, it is advantageous that the analysing stage and the alteration stage are included within the electronic device.
Additionally it is of advantage that the analysing stage and the alteration stage assembled in a separate device connected to an audio rendering device.
According to the invention it is purposive that the analysing stage includes a psycho-acoustic model to identify signal content not perceivable by a human listener. And additionally it is advantageous that the psycho-acoustic stage identifies a signal content as not perceivable by a human listener if a part of a signal falls below a predefined threshold.
Therefore the problem according to the method will be solved using a method of reducing the signal content of an electronic signal of an audio rendering device to reduce power consumption, the electronic device comprises an input stage, and an output stage, the device comprises furthermore a stage to analyse the signal content of the signal to identify the parts of a signal not perceivable by a human listener and a alteration stage to delete the parts of the signal identified as not perceivable by a human listener, wherein the analysing stage analyses the signal and identifies a signal content that is not perceivable by a human listener and the alteration stage deletes the identified signal content as being identified as not perceivable by an human listener.
Accordingly it is of advantage that the analysing stage uses a psycho-acoustic model to identify signal content not perceivable by a human listener. Additionally it is of advantage that the psycho-acoustic stage identifies a signal content as not perceivable by a human listener if a part of a signal falls below a predefined threshold. BRIEF DESCRIPTION OF THE DRAWINGS
The above and other features and advantages of the invention will be apparent from the following description of an exemplary embodiment of the invention with reference to the accompanying drawings, in which:
Fig. 1 shows a schematic view of an inventive device and Fig. 2 shows a diagram of an inventive method.
DESCRIPTION OF EMBODIMENTS Figure 1 shows a schematic view of the device 1 according to the invention.
An audio rendering device 1 comprises different stages of signal processing. In a signal processing chain, there is an input stage 2, one or more signal processing stages 4 and an output stage 3. In Figure 1 stage 4 represents the last stage of normal signal processing in the normal signal processing path.
According to the invention, the input and output stages as well as the signal processing stages can be analogue or digital and in the embodiment of Figure 1 the device has digital signal processing stages and therefore the audio signal between the last processing stage 4 and the output stage is a digital signal. According to the invention the output stage can be a digital stage or a Digital-to-Analogue converter.
Between the last processing stage 4 and the output stage 3 there are arranged two new stages 5 and 6 according to the invention.
Stage 5 is a stage or device to analyse the signal content of the incoming signal
7 and stage or device 6 is responsible to change the signal content of the signal 7.
The analysis part of said stage 5 consists of a psycho-acoustic model which identifies the signal content that will not be perceivable by a human listener. The threshold of what is perceivable and what is not perceivable can be adjusted by the operator or can be adjusted according to the abilities of the normal human listeners.
After having identified parts of the signal not perceivable by human listeners, the inventive device 1 deletes the respective signals. The parts of the signals left out will lead to a significant reduction of the power consumption of the audio system compared to the technique of only reducing the data contend and to increase the quantisation noise of such parts of the signal, since these signals have to be transmitted anyway and according to the present invention, the deleted parts of the signal will not lead to power consumption. Therefore the over all power consumption will be reduced.
The psycho-acoustic model may be implemented such that the system comprises a transformation of signals to the frequency domain, followed by application of a predetermined masking threshold to the transformed signal. In case that a part of a signal falls below the threshold this part of the signal will be accepted and marked as imperceptible by a human listener.
In stage 6 the device alters the signal content of the incoming signal. In this block, the signal content that will not be perceived by a human listener are removed from the signal.
This can be done in the time domain or in the frequency domain. Since the signal is already transferred to the frequency domain in block 5, this representation of the signal is additionally an interface between the blocks 5 and 6.
After the alteration and the deletion of the non perceivable parts of the signal, the signal will be transformed back to the time domain and outputted by the output block 3.
In cases where the signal processing path does comprise an audio encoding module- like a MP3- or WMA-encoder, the device may use the psycho-acoustic model from the audio encoder or the device may be in signal communication with a stand-alone device comprising the psycho-acoustic model to analyse a signal and to alter a signal according to the invention.
Figure 2 displays the method 10 according to the invention by way of an embodiment. In block 11 the signal is transferred to the frequency domain. Within the frequency domain the analysing stage analyses in block 12 the signal content of the signal and identifies the parts of the signal not perceivable by the human listener. This signal is transferred to the alteration stage and the alteration stage deletes the part of the signal or the signal content not perceivable by the human listener, see block 13. Block 15 in between 13 and 14 transforms the signal back from the frequency domain to the time domain. In block , the remaining signal is outputted at the output.

Claims

CLAIMS:
1. Electronic device (1), especially an audio rendering device, including an input stage (2), and an output stage (3), comprising furthermore a stage (5) to analyse the signal content of the signal to identify the parts of a signal not perceivable by a human listener and a alteration stage (6) to delete the parts of the signal identified as not perceivable by a human listener.
2. Electronic device according to claim 1, wherein the analysing stage (5) and/or the alteration stage (6) are included within the electronic device (1).
3. Electronic device according to claim 1, wherein the analysing stage (5) and/or the alteration stage (6) assembled in a separate device connected to an audio rendering device.
4. Electronic device according to claims 1 to 3, wherein the analysing stage (5) includes a psycho-acoustic model to identify signal content not perceivable by a human listener.
5. Electronic device according to claim 4, wherein the psycho-acoustic stage or model (5) identifies a signal content as not perceivable by a human listener if a part of a signal falls below a predefined threshold.
6. Method of reducing the signal content of an electronic signal of an audio rendering device (1) to reduce power consumption, the electronic device (1) comprises an input stage (2), and an output stage (3), the device comprises furthermore a stage to analyse the signal content of the signal to identify the parts of a signal not perceivable by a human listener and a alteration stage to delete the parts of the signal identified as not perceivable by a human listener, wherein the analysing stage analyses the signal and identifies a signal content that is not perceivable by a human listener and the alteration stage deletes the identified signal content as being identified as not perceivable by an human listener.
7. Method according to claim 6, wherein the analysing stage uses a psycho- acoustic model to identify signal content not perceivable by a human listener.
8. Method according to claim 6 or 7, wherein the psycho-acoustic stage identifies a signal content as not perceivable by a human listener if a part of a signal falls below a predefined threshold.
PCT/IB2008/051581 2007-05-29 2008-04-24 Device and method to reduce power consumption Ceased WO2008146183A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07109125 2007-05-29
EP07109125.0 2007-05-29

Publications (1)

Publication Number Publication Date
WO2008146183A1 true WO2008146183A1 (en) 2008-12-04

Family

ID=39768807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/051581 Ceased WO2008146183A1 (en) 2007-05-29 2008-04-24 Device and method to reduce power consumption

Country Status (1)

Country Link
WO (1) WO2008146183A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117093182A (en) * 2023-10-10 2023-11-21 荣耀终端有限公司 Audio playback method, electronic device and computer-readable storage medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661821A1 (en) * 1993-11-25 1995-07-05 SHARP Corporation Encoding and decoding apparatus causing no deterioration of sound quality even when sinewave signal is encoded
JP2005148539A (en) * 2003-11-18 2005-06-09 Matsushita Electric Ind Co Ltd Audio signal encoding apparatus and audio signal encoding method
JP2006023658A (en) * 2004-07-09 2006-01-26 Matsushita Electric Ind Co Ltd Audio signal encoding apparatus and audio signal encoding method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661821A1 (en) * 1993-11-25 1995-07-05 SHARP Corporation Encoding and decoding apparatus causing no deterioration of sound quality even when sinewave signal is encoded
JP2005148539A (en) * 2003-11-18 2005-06-09 Matsushita Electric Ind Co Ltd Audio signal encoding apparatus and audio signal encoding method
JP2006023658A (en) * 2004-07-09 2006-01-26 Matsushita Electric Ind Co Ltd Audio signal encoding apparatus and audio signal encoding method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117093182A (en) * 2023-10-10 2023-11-21 荣耀终端有限公司 Audio playback method, electronic device and computer-readable storage medium
CN117093182B (en) * 2023-10-10 2024-04-02 荣耀终端有限公司 Audio playback method, electronic device and computer-readable storage medium

Similar Documents

Publication Publication Date Title
US6453282B1 (en) Method and device for detecting a transient in a discrete-time audiosignal
EP2887350B1 (en) Adaptive quantization noise filtering of decoded audio data
JP5917518B2 (en) Speech signal dynamic correction for perceptual spectral imbalance improvement
EP2635045A1 (en) Hearing aid device
CA2780962C (en) Methods and arrangements for loudness and sharpness compensation in audio codecs
US20130136266A1 (en) System for Dynamic Spectral Correction of Audio Signals to Compensate for Ambient Noise
WO2006066272A3 (en) Method and apparatus for authenticating a magnetic fingerprint signal using an adaptive analog to digital converter
TW200746873A (en) Binaural rendering using subband filters
EP2473994A1 (en) Enhanced audio decoder
CN101667437A (en) Audio telecommunication system and method
WO2006014845A3 (en) Ontology based method for data capture and knowledge representation
IL176857A0 (en) Audio coding
EP1931172B1 (en) Hearing aid with noise cancellation and corresponding method
WO2008146183A1 (en) Device and method to reduce power consumption
RU2006132742A (en) METHOD AND DEVICE FOR QUANTIZING INFORMATION SIGNAL
AU4627801A (en) Method for the elimination of noise signal components in an input signal for an auditory system, use of said method and hearing aid
US20250140272A1 (en) Masking threshold determinator, audio encoder, method and computer program for determining a masking threshold information
EP1841284A1 (en) Hearing instrument for storing encoded audio data, method of operating and manufacturing thereof
CN118400463A (en) Data processing method, system, equipment and medium for video color ring
KR100746010B1 (en) Apparatus and method for controlling the magnitude of a received voice signal
JP5046233B2 (en) Speech enhancement processor
WO2023214020A1 (en) Device for reducing noise during the reproduction of an audio signal using a headphone or hearing aid, and corresponding method
EP1424780A3 (en) Delta-sigma modulator, method of switching delta-sigma modulator, and digital amplifier
JP3624884B2 (en) Audio data processing device
JP2913735B2 (en) Highly efficient digital data encoding method.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08737979

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08737979

Country of ref document: EP

Kind code of ref document: A1