WO2005104360A1 - Radio receiver volume control system - Google Patents

Radio receiver volume control system Download PDF

Info

Publication number
WO2005104360A1
WO2005104360A1 PCT/GB2005/001520 GB2005001520W WO2005104360A1 WO 2005104360 A1 WO2005104360 A1 WO 2005104360A1 GB 2005001520 W GB2005001520 W GB 2005001520W WO 2005104360 A1 WO2005104360 A1 WO 2005104360A1
Authority
WO
WIPO (PCT)
Prior art keywords
adjusting
electronic device
signal
radio
gain
Prior art date
Application number
PCT/GB2005/001520
Other languages
French (fr)
Inventor
Kevin Dale
Colin Crawford
Original Assignee
Imagination Technologies Limited
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 Imagination Technologies Limited filed Critical Imagination Technologies Limited
Publication of WO2005104360A1 publication Critical patent/WO2005104360A1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/13—Arrangements for device control affected by the broadcast information

Definitions

  • This invention relates to a method for adjusting the volume levels of radio broadcasts in radio receiver systems .
  • Radio receiver systems for automotive audio systems in which volume adjustment is provided in response to the electromagnetic field strength of the channel at the receiver are well known.
  • British patent application number 762922 describes a method of reducing the audio volume of the receiver if the radio channel field strength at the receiver is particularly weak. In such circumstances, high- power amplifiers are required to amplify the weak signal and this results in a large quantity of interference being heard by the user. In this case it is advantageous to reduce the volume of the received channel so that the interference reproduced by the loudspeaker system is never higher than a predetermined volume level .
  • US patent number 6473604 describes an automotive audio system in which the output volume level of the speaker system is adjusted according to the input level from various different input sources such as AM/FM tuners, cassette tape players or compact disc systems. This is achieved by first creating a reference output level from the CD, radio, or tape player by inputting a reference input signal to these sources. The input source offset is then based on the resulting reference output level. By measuring the output levels electronically, the offset to be applied to each source can be stored electronically and applied each time the source changes.
  • a problem not addressed by this document is that radio stations broadcast at different volume levels, so that changing between radio stations can result in an inaudible sound on one channel while a neighbouring channel may be too loud or quiet for the user. Preferred embodiments of the present invention overcome these problems .
  • a method for adjusting the audio volume of an audio electronic device comprising the steps of receiving a signal, receiving additional data associated with the signal, and adjusting the gain applied to an amplifier for the received signal in dependence on the received additional data.
  • the electronic device is a digital audio broadcast radio receiver.
  • the embodiment disclosed here has the advantage that the output volume level of a received radio channel can be automatically adjusted according to a user's preferences regardless of the transmit volume level selected by the broadcaster. Additionally, a user can opt to have the output volume level of different radio channels at different levels based on user-stored preferences. Furthermore, different output volume levels can be selected from the stored user preferences for different programme types .
  • FIG. 1 shows a block diagram of apparatus embodying the invention.
  • a radio transmitter 1 and antenna 3 from which radio waves propagate and which are received by a user with an antenna 7 and receiver 9.
  • a processor 11 analyses the input signal and determines the source of the received signal.
  • the determination of the source can be achieved in a variety of ways.
  • the radio waves are broadcast using the Digital Audio Broadcast (DAB) digital radio service.
  • DAB Digital Audio Broadcast
  • this service allows programme-associated data to be transmitted along with sound information.
  • Such data can simply be text data indicating the current channel or can be other information relating to the current broadcast or a menu of future broadcasts. With this channel identifying information, the processor 11 can then access a memory unit 13 and retrieve appropriate level data stored in the memory unit 13.
  • DAB Digital Audio Broadcast
  • This level data is then used by the processor 18 to adjust the gain applied to an amplifier 17 for the signal so that an acceptable volume level is produced by from the speakers 19.
  • substantially the same average value is produced for each channel.
  • the Digital Audio Broadcast (DAB) digital radio service can be used to send information relating to the broadcast e.g. the broadcast level of a particular channel or even a particular programme can be included in the broadcast data.
  • Such information allows the processor 11 to calculate the gain adjustment required so that the output volume level is maintained at a predetermined, possibly user determined level by adjusting the gain of the amplifier 17.
  • the processor calculates the gain adjustment required and applies it to the amplifier so that the output volume level is maintained at the user preferred level, based on the data received from the broadcaster, and user preferences also stored in the memory unit.
  • the gain adjustment can be such that the output volume of the channels is substantially the same level no matter what the broadcast level of the radio station or the channel selected by the user.
  • the memory unit stores additional information relating to a user defined gain to be applied to each channel which may be different for each channel, in addition to the gain adjustment information that allows the user to change the channel and have the output level at a preferred default value for all channels. For example, some users may wish to listen to one channel quite loudly, while they may wish to listen to another channel rather more quietly. Accordingly, the user can vary the output volume of the channel according to the channel. In this case the user would program the radio receiver and store his volume preferences in the memory unit 13.
  • Such an embodiment allows the user to change channels and allows him to listen to a variety of channels at his preferred different volume levels.
  • the user can store personal values in the memory unit relating to a desired volume level for different types of programme within the same channel .
  • Such an embodiment works in a similar manner to the previous embodiment.
  • the user is able to select which of the methods of gain adjustment is to be applied by means of a selection device provided on the receiver and its processor . The present invention is described with reference to a
  • DAB radio receiver DAB radio receiver.
  • additional information e.g. text information
  • RDS Radio Data System
  • the microprocessor-controlled tuner is retuned to receive the RDS data, during which the audio signal is muted. This operation occurs within a few mS and so the user is unaware of any break in the broadcast.
  • the RDS system allows programme service (PS) information to be encoded into the broadcast signal and detected by receivers where the name of the station currently tuned to can be read.
  • the processor can then adjust the gain and the output volume level based upon the programme service information, and the preferred values stored by the user during the setup or by the manufacturer in the memory unit as described previously.
  • the RDS system also allows programme type information (PTY) whereby radio stations can assign different programme types to their shows e.g. NEWS, ROCK MUSIC, or CLASSICS.
  • An embodiment of the invention as described above takes this text information and matches the text part to a corresponding text string used to look up information stored in the memory unit 13 relating to user preferences according to the type of programme.
  • the receiver will automatically adjust the gain to be applied according to the type of broadcast.
  • a similar procedure could also be performed with traffic programme (TP) and traffic announcement (TA) data.
  • TP traffic programme
  • TA traffic announcement
  • the channel volume broadcast offset information can be stored at the time of manufacture from information obtained from the broadcaster.
  • the invention can also be used in a wide variety of electronic devices such as CD players, MP3 players, and mini disc players where an "average" volume field can be incorporated into the header information of the track so that the appropriate offset can be applied according to the track average volume level and to the user's preferences.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

A method and system for adjusting the audio volume of an electronic device such as a digital audio broadcast radio receiver is described. The gain of an amplifier is adjusted according to additional data received with the signal, preferably a radio signal, so that the output volume level of a channel can be automatically adjusted.

Description

Radio receiver volume control system
This invention relates to a method for adjusting the volume levels of radio broadcasts in radio receiver systems . Radio receiver systems for automotive audio systems in which volume adjustment is provided in response to the electromagnetic field strength of the channel at the receiver are well known. British patent application number 762922 describes a method of reducing the audio volume of the receiver if the radio channel field strength at the receiver is particularly weak. In such circumstances, high- power amplifiers are required to amplify the weak signal and this results in a large quantity of interference being heard by the user. In this case it is advantageous to reduce the volume of the received channel so that the interference reproduced by the loudspeaker system is never higher than a predetermined volume level . More recently, US patent number 6473604 describes an automotive audio system in which the output volume level of the speaker system is adjusted according to the input level from various different input sources such as AM/FM tuners, cassette tape players or compact disc systems. This is achieved by first creating a reference output level from the CD, radio, or tape player by inputting a reference input signal to these sources. The input source offset is then based on the resulting reference output level. By measuring the output levels electronically, the offset to be applied to each source can be stored electronically and applied each time the source changes. A problem not addressed by this document is that radio stations broadcast at different volume levels, so that changing between radio stations can result in an inaudible sound on one channel while a neighbouring channel may be too loud or quiet for the user. Preferred embodiments of the present invention overcome these problems . In accordance with the present invention there is provided a method for adjusting the audio volume of an audio electronic device comprising the steps of receiving a signal, receiving additional data associated with the signal, and adjusting the gain applied to an amplifier for the received signal in dependence on the received additional data. Preferably, the electronic device is a digital audio broadcast radio receiver. The embodiment disclosed here has the advantage that the output volume level of a received radio channel can be automatically adjusted according to a user's preferences regardless of the transmit volume level selected by the broadcaster. Additionally, a user can opt to have the output volume level of different radio channels at different levels based on user-stored preferences. Furthermore, different output volume levels can be selected from the stored user preferences for different programme types . Such an arrangement overcomes the problem of a large variation in output volume level associated with changing radio channels or the change in volume levels required by the user when listening to different radio programmes within the same channel. An embodiment of the invention will now be described in detail by way of reference to the accompanying drawing, in which:
Figure 1 shows a block diagram of apparatus embodying the invention.
Referring to figure 1, there is shown 1 a radio transmitter 1 and antenna 3 from which radio waves propagate and which are received by a user with an antenna 7 and receiver 9. A processor 11 then analyses the input signal and determines the source of the received signal. The determination of the source can be achieved in a variety of ways. Preferably, the radio waves are broadcast using the Digital Audio Broadcast (DAB) digital radio service. Apart from usual advantages of digital technology, this service allows programme-associated data to be transmitted along with sound information. Such data can simply be text data indicating the current channel or can be other information relating to the current broadcast or a menu of future broadcasts. With this channel identifying information, the processor 11 can then access a memory unit 13 and retrieve appropriate level data stored in the memory unit 13. This level data is then used by the processor 18 to adjust the gain applied to an amplifier 17 for the signal so that an acceptable volume level is produced by from the speakers 19. In one embodiment substantially the same average value is produced for each channel. In a further embodiment the Digital Audio Broadcast (DAB) digital radio service can be used to send information relating to the broadcast e.g. the broadcast level of a particular channel or even a particular programme can be included in the broadcast data. Such information allows the processor 11 to calculate the gain adjustment required so that the output volume level is maintained at a predetermined, possibly user determined level by adjusting the gain of the amplifier 17. The processor calculates the gain adjustment required and applies it to the amplifier so that the output volume level is maintained at the user preferred level, based on the data received from the broadcaster, and user preferences also stored in the memory unit. The gain adjustment can be such that the output volume of the channels is substantially the same level no matter what the broadcast level of the radio station or the channel selected by the user. In a further embodiment the memory unit stores additional information relating to a user defined gain to be applied to each channel which may be different for each channel, in addition to the gain adjustment information that allows the user to change the channel and have the output level at a preferred default value for all channels. For example, some users may wish to listen to one channel quite loudly, while they may wish to listen to another channel rather more quietly. Accordingly, the user can vary the output volume of the channel according to the channel. In this case the user would program the radio receiver and store his volume preferences in the memory unit 13. Such an embodiment allows the user to change channels and allows him to listen to a variety of channels at his preferred different volume levels. In yet a further embodiment, the user can store personal values in the memory unit relating to a desired volume level for different types of programme within the same channel . Such an embodiment works in a similar manner to the previous embodiment. Preferably the user is able to select which of the methods of gain adjustment is to be applied by means of a selection device provided on the receiver and its processor . The present invention is described with reference to a
DAB radio receiver. However those skilled in the art will appreciate the applicability of the invention to conventional analogue radio on the VHF/FM wavebands. For these wavebands additional information (e.g. text information) can be transmitted to a receiver. This is achieved by using an encoder to inject a Radio Data System (RDS) message on the 'normal FM radio signal modulated just above the stereo audio signal. To receive the RDS message during the broadcast, the microprocessor-controlled tuner is retuned to receive the RDS data, during which the audio signal is muted. This operation occurs within a few mS and so the user is unaware of any break in the broadcast. The RDS system allows programme service (PS) information to be encoded into the broadcast signal and detected by receivers where the name of the station currently tuned to can be read. The processor can then adjust the gain and the output volume level based upon the programme service information, and the preferred values stored by the user during the setup or by the manufacturer in the memory unit as described previously. The RDS system also allows programme type information (PTY) whereby radio stations can assign different programme types to their shows e.g. NEWS, ROCK MUSIC, or CLASSICS. An embodiment of the invention as described above takes this text information and matches the text part to a corresponding text string used to look up information stored in the memory unit 13 relating to user preferences according to the type of programme. Then for example, if a user in a vehicle is listening to one type of programme at a background level, and the user has set the preferences that news programmes are to be turned up to a higher volume level, then the receiver will automatically adjust the gain to be applied according to the type of broadcast. A similar procedure could also be performed with traffic programme (TP) and traffic announcement (TA) data. Alternatively, in this case, the channel volume broadcast offset information can be stored at the time of manufacture from information obtained from the broadcaster. The present invention is described with reference to a radio receiver. However those skilled in the art will appreciate the applicability of the invention to other receiving equipment such as mobile phones, and televisual broadcasts. Additionally, the invention can also be used in a wide variety of electronic devices such as CD players, MP3 players, and mini disc players where an "average" volume field can be incorporated into the header information of the track so that the appropriate offset can be applied according to the track average volume level and to the user's preferences.

Claims

1. A method for adjusting the audio volume of an audio electronic device comprising the steps of: receiving a signal; receiving additional data associated with the signal; and adjusting the gain applied to an amplifier for the received signal in dependence on the received additional data.
2. A method for adjusting the audio volume according to claim 1 in which the electronic device is a digital audio broadcast radio receiver.
3. A method for adjusting the audio volume according to claim 1 in which the electronic device is an analogue radio equipped with radio data system decoding.
4. A method according to claim 1, 2, or 3 in which the step of adjusting the gain comprises the step of retrieving stored data relating to the received signal and deriving an adjustment from the gain of the amplifier from the stored data.
5. A method according to claims 1 to 4 in which the gain adjustment derived when applied to the amplifier produces substantially the same output level for each received signal.
6. A method according to claims 1 to 5 in which the gain adjustment is derived in dependence on a user defined volume preference for each received signal.
7. A method according to claims 1 to 6 in which the gain adjustment is derived in dependence on programme data received in the additional information associated with the received signal.
8. A method according to claims 4 to 7 in which the user may select the method of gain adjustment.
9. A system for adjusting the audio volume of an audio electronic device comprising: means for receiving a signal; means for receiving additional data associated with the signal; and means for adjusting the gain applied to an amplifier for the received signal in dependence on the received additional data.
10. A system for adjusting the audio volume according to claim 9 in which the electronic device is a digital audio broadcast radio receiver.
11. A system for adjusting the audio volume according to claim 9 in which the electronic device is an analogue radio equipped with radio data system decoding.
12. A method for adjusting the output audio volume of an electronic device substantially as herein described with reference to the drawing.
PCT/GB2005/001520 2004-04-21 2005-04-21 Radio receiver volume control system WO2005104360A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0408875.3 2004-04-21
GB0408875A GB2413906A (en) 2004-04-21 2004-04-21 Radio volume control system

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WO2005104360A1 true WO2005104360A1 (en) 2005-11-03

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WO2008051347A2 (en) 2006-10-20 2008-05-02 Dolby Laboratories Licensing Corporation Audio dynamics processing using a reset
US8396574B2 (en) 2007-07-13 2013-03-12 Dolby Laboratories Licensing Corporation Audio processing using auditory scene analysis and spectral skewness
US8428270B2 (en) 2006-04-27 2013-04-23 Dolby Laboratories Licensing Corporation Audio gain control using specific-loudness-based auditory event detection
US8600074B2 (en) 2006-04-04 2013-12-03 Dolby Laboratories Licensing Corporation Loudness modification of multichannel audio signals
US9350311B2 (en) 2004-10-26 2016-05-24 Dolby Laboratories Licensing Corporation Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal

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US20060046685A1 (en) * 2004-08-31 2006-03-02 Hjelmeland Robert W System and process for automatically adjusting the acoustic settings to best fit an audio system
US9559657B2 (en) * 2013-10-31 2017-01-31 Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America Method and apparatus for mode balance for analog FM, digital radio blend logic in an automotive environment
DE102016204708A1 (en) * 2016-03-22 2017-09-28 Bayerische Motoren Werke Aktiengesellschaft Means of transport and method for adjusting an audio reproduction volume
DE102017208067A1 (en) * 2017-05-12 2018-11-15 Bayerische Motoren Werke Aktiengesellschaft Vehicle system and method for optimizing the reproduction of audio files in the vehicle
KR20200108718A (en) * 2019-03-11 2020-09-21 삼성전자주식회사 Electronic device for processing audio data and operating method thereof

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US20060002573A1 (en) 2006-01-05
GB2413906A (en) 2005-11-09

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