JP2007158614A - Mobile phone and method for adjusting received sound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a mobile phone capable of automatically adjusting the frequency characteristics of a sound signal only by singly setting a received volume by a user, and a method for adjusting a received sound. <P>SOLUTION: Signal levels at every frequency of the sound signals corresponding to the received volumes in settings received by an operating section 9 are read by a memory 8 storing signal levels at every frequency of the sound signals at every set value of the received volumes. The signal levels of the sound signals extracted by a DSP 3 so as to coincide with the signal levels at every frequency are adjusted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile phone having a function of adjusting a signal level of a voice signal and a received voice adjustment method.

The older the user who uses the mobile phone, the more difficult it is to hear high frequency sound.
Therefore, the conventional mobile phone prompts the user to input the age of the user before use, and adjusts the frequency characteristic of the received voice according to the age (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-209698 (paragraph number [0010], FIG. 2)

  Since the conventional mobile phone is configured as described above, if the user can input the age in advance, it is easy even for elderly people whose hearing level is low and it is difficult to hear high-frequency sounds. It is possible to listen to the received voice. However, since it is generally difficult to request a complicated setting operation for an elderly person, it is not always possible for the user to input the age in advance, and in many cases, the received voice cannot be optimized. There were issues such as.

  The present invention has been made to solve the above-described problems, and a mobile phone and a reception voice adjustment method capable of automatically adjusting a frequency characteristic of a voice signal by a user simply setting a reception volume. The purpose is to obtain.

  The cellular phone according to the present invention provides an audio signal corresponding to the received sound volume whose setting is accepted by the sound volume setting means from the frequency characteristic storage means for storing the signal level for each frequency of the sound signal for each set value of the received sound volume. The signal level for each frequency is read out, and the signal level of the audio signal extracted by the audio signal extraction means is adjusted so as to coincide with the signal level for each frequency.

  According to the present invention, the frequency of the sound signal corresponding to the received sound volume set by the sound volume setting means from the frequency characteristic storage means storing the signal level for each frequency of the sound signal for each set value of the received sound volume. Since another signal level is read and the signal level of the audio signal extracted by the audio signal extraction means is adjusted to match the signal level for each frequency, the user simply sets the reception volume. There is an effect that the frequency characteristic of the voice signal is automatically adjusted to optimize the received voice.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a mobile phone according to Embodiment 1 of the present invention. In the figure, an antenna 1 radiates a radio signal in the air while receiving a radio signal arriving from the air.
The radio unit 2 demodulates the radio signal received by the antenna 1, decodes the demodulated radio signal, outputs the decoded data to the DSP 3, and encodes transmission data output from the DSP 3. Then, the encoded data is modulated, and the modulated signal is output to the antenna 1 as a radio signal.
A DSP (Digital Signal Processor) 3 serving as a signal processing unit extracts a digital audio signal from the decoded data output from the radio unit 2, and under the instruction of the CPU 10, the frequency characteristics of the digital audio signal (signal level for each frequency) Perform volume and sound quality adjustment processing to adjust the sound.
Further, the DSP 3 performs volume / sound quality adjustment processing on the digital audio signal output from the DA / AD converter 4, and outputs transmission data including the adjusted digital audio signal to the radio unit 2.
The radio unit 2 and the DSP 3 constitute an audio signal extraction unit.

The DA / AD converter 4 converts the digital audio signal adjusted by the DSP 3 into an analog audio signal and outputs the analog audio signal to the audio control unit 5, while the analog audio signal output from the audio control unit 5 is digitally converted. It converts into an audio signal and outputs the digital audio signal to the DSP 3.
Under the instruction of the CPU 10, the voice control unit 5 reproduces the analog voice signal output from the DA / AD converter 4 and outputs the received voice to the receiver 7, while the transmitted voice captured by the microphone 6 is converted into the analog voice. The signal is converted into a signal and the analog audio signal is output to the DA / AD converter 4.
The DA / AD converter 4, the audio control unit 5, and the receiver 7 constitute audio signal reproducing means.

The memory 8 stores in advance parameter values for volume / sound quality adjustment processing for realizing a predetermined frequency characteristic (signal level for each frequency) of the audio signal for each set value of the received sound volume. The memory 8 constitutes frequency characteristic storage means.
Here, FIG. 6 is an explanatory diagram showing the frequency characteristics of the digital audio signal suitable for the set value of each received sound volume. In the example of FIG. 6, when the received sound volume setting value is N + 2 or more, the received sound volume setting value is A frequency characteristic in which a signal having a high frequency of about 600 Hz or more is emphasized as compared with the case of N + 1 or less is shown.
The operation unit 9 is an operation button such as a menu key or a numeric keypad of a mobile phone, for example, and the user operates the operation unit 9 to input a set value of the reception volume. The operation unit 9 constitutes volume setting means.
The CPU 10 is a control unit that controls processing contents of the DSP 3 and the voice control unit 5. For example, the CPU 10 realizes a predetermined frequency characteristic of the voice signal corresponding to the received sound volume set by the operation unit 9 from the memory 8. The parameter value of the volume / sound quality adjustment processing is read and the parameter value is output to the DSP 3 to instruct the DSP 3 to adjust the frequency characteristic of the extracted digital audio signal.
The display unit 11 displays the received sound volume whose setting has been received by the operation unit 9.
The DSP 3 and the CPU 10 constitute an audio signal adjustment unit.

FIG. 2 is a block diagram showing the inside of the DSP of the mobile phone according to Embodiment 1 of the present invention. In the figure, the same reference numerals as those in FIG.
The DSP 3 includes a parameter reflection unit 31 and a sound adjustment unit 32 as components that perform volume / sound quality adjustment processing.
Under the instruction of the CPU 10, the parameter reflection unit 31 reads out the parameter value of the volume / sound quality adjustment processing that realizes the frequency characteristic corresponding to the received sound volume set by the operation unit 9 from the memory 8, and adjusts the parameter value by voice adjustment To the unit 32.
The voice adjustment unit 32 adapts the parameter value output from the parameter reflection unit 31 to the volume / sound quality adjustment process, so that the frequency characteristic of the digital voice signal corresponds to the reception volume whose setting is accepted by the operation unit 9. Adjustments that match are realized.
3 and 4 are flowcharts showing the received voice adjusting method according to the first embodiment of the present invention.

Next, the operation will be described.
FIG. 5 is an explanatory diagram showing a general tendency of the hearing level by age.
In general, it is known that the hearing level decreases at all frequencies with aging. The higher the frequency, the greater the amount of decrease.
That is, the older the user who uses the mobile phone, the more difficult it is to hear high frequency sound.
In the first embodiment, the frequency characteristic of the audio signal can be automatically adjusted by the user simply setting the reception volume.
Specifically, it is as follows.

When an incoming call is received when the mobile phone is in the standby state (step ST1) or when the user makes a call by operating the operation unit 9 (step ST1), the CPU 10 changes the state of the mobile phone from the standby state to the call state. Transition (step ST2).
At this time, the CPU 10 reads the set value of the reception volume set by using the operation unit 9 (step ST3).

When the CPU 10 reads the set value of the received sound volume, it gives an instruction for adjusting the frequency characteristic of the digital audio signal to the DSP 3 so as to match the frequency characteristic corresponding to the set value of the received sound volume (step ST4).
That is, since the parameter value of the volume / sound quality adjustment processing for realizing the predetermined frequency characteristic of the audio signal is stored in the memory 8 for each set value of the received sound volume, the CPU 10 sets the received sound volume setting value from the memory 8. An instruction to read the corresponding parameter value is output to the parameter reflection unit 31 of the DSP 3.

As a result, the parameter reflecting unit 31 of the DSP 3 reads the parameter value corresponding to the set value of the received sound volume from the memory 8 (step ST21 in FIG. 4), and outputs the parameter value to the sound adjusting unit 32 of the DSP 3.
When the voice adjusting unit 32 of the DSP 3 receives the parameter value corresponding to the set value of the received sound volume from the parameter reflecting unit 31, it adapts the parameter value to the volume / sound quality adjusting process (step ST22).

Here, it is considered that the user who has the hearing level in the 70s increases the setting of the received sound volume because the entire hearing level is lower than the user who has the hearing level of the 60s or less.
For this reason, when a user having a hearing level in his 70s sets a large reception volume of N + 2 or more, as shown in FIG. 6, a parameter value that realizes a frequency characteristic in which a high-frequency signal level of about 600 Hz or more is emphasized. It will be applied to volume / sound quality adjustment processing.
On the other hand, when a user who has a hearing level of 60s or less who does not need to emphasize the high range and sets a small reception volume of N + 1 or less, a high level signal level of about 600 Hz or higher is emphasized as shown in FIG. A parameter value that realizes no frequency characteristics is applied to the volume / sound quality adjustment processing.

When the voice adjustment unit 32 of the DSP 3 performs the process of adapting the parameter value to the volume / sound quality adjustment process, the CPU 10 outputs a call start command to the DSP 3 and the voice control unit 5 (step ST5).
When the DSP 3 receives a call start command from the CPU 10 and then receives decoded data from the radio unit 2 (the radio unit 2 demodulates the radio signal received by the antenna 1 and decodes the demodulated radio signal The decoded data is output to the DSP 3), and a digital audio signal is extracted from the decoded data. Since the extraction process of the digital audio signal is a known technique, the description is omitted here. The audio adjustment unit 32 of the DSP 3 outputs from the parameter reflection unit 31 under the instruction of the CPU 10 when the extraction of the digital audio signal is completed. By performing the volume / sound quality adjustment process to which the parameter value is applied, the frequency characteristic of the digital audio signal matches the frequency characteristic corresponding to the received sound volume whose setting is accepted by the operation unit 9 Realize the adjustment.

When the DSP 3 adjusts the signal level of the digital audio signal, the DA / AD converter 4 performs D / A conversion processing for converting the adjusted digital audio signal into an analog audio signal, and converts the analog audio signal to the audio control unit 5. Output to.
When receiving the analog audio signal from the DA / AD converter 4, the audio control unit 5 reproduces the analog audio signal under the instruction of the CPU 10 and outputs the received audio to the receiver 7.

As described above, the user can change the set value of the received sound volume by operating the operation unit 9 even after the call is started.
When the CPU 10 detects that the set value of the received sound volume has been changed (step ST6), the CPU 10 reads the set value of the received sound volume after the change (step ST7), and the frequency characteristics corresponding to the changed set value of the received sound volume. The DSP 3 is instructed to adjust the frequency characteristics of the digital audio signal so as to match (step ST8).
That is, the CPU 10 stores the parameter value of the volume / sound quality adjustment processing for realizing the predetermined frequency characteristic of the audio signal for each set value of the received sound volume in the memory 8. An instruction to read a parameter value corresponding to the set value is output to the parameter reflection unit 31 of the DSP 3.

Thereby, the parameter reflection unit 31 of the DSP 3 reads out the parameter value corresponding to the changed set value of the received sound volume from the memory 8 (step ST21 in FIG. 4), and outputs the parameter value to the sound adjustment unit 32 of the DSP 3. .
For example, when the set value of the reception volume is changed from N + 1 to N + 2, the signal level increases by about 4 dB in the low frequency range of about 400 Hz to 500 Hz, and the signal level increases in the high frequency range of about 1000 Hz to 2000 Hz. The parameter value of the sound volume / sound quality adjustment processing that realizes the frequency characteristic whose level increases by about 7 dB is read out, and the parameter value is output to the sound adjustment unit 32 of the DSP 3.
When the voice adjustment unit 32 of the DSP 3 receives a parameter value corresponding to the set value of the received sound volume after the change from the parameter reflection unit 31, it adapts the parameter value to the volume / sound quality adjustment process (step ST22). By performing the sound quality adjustment process, an adjustment is realized such that the frequency characteristic of the digital audio signal matches the frequency characteristic corresponding to the set value of the received sound volume after the change accepted by the operation unit 9.

  Thereafter, as long as the call continues, every time the user changes the set value of the received sound volume, the processes of steps ST6 to ST8 are repeated (steps ST9 and ST10).

As is apparent from the above, according to the first embodiment, the reception of which the setting is received by the operation unit 9 from the memory 8 storing the signal level for each frequency of the audio signal for each set value of the reception volume. Since the signal level for each frequency of the audio signal corresponding to the volume is read and the signal level of the audio signal extracted by the DSP 3 is adjusted to match the signal level for each frequency, the user simply receives the received volume. Is set, the frequency characteristic of the voice signal is automatically adjusted, and the received voice can be optimized.
That is, for a normal hearing person with a hearing level of 60's or lower who does not require high frequency emphasis, the frequency characteristics of the audio signal can be flattened to reproduce the received voice without feeling uncomfortable, while high frequency emphasis is required. For a hearing-impaired person who has a hearing level of 70's, the frequency characteristic of the audio signal is emphasized in a high frequency range, and the effect of facilitating listening to high-frequency sound can be achieved.

Embodiment 2. FIG.
In the first embodiment, the DSP 3 adjusts the frequency characteristic (signal level for each frequency) of the digital audio signal under the instruction of the CPU 10. However, as shown in FIG. The audio adjustment unit 51 may adjust the frequency characteristics of the analog audio signal under the instruction of the CPU 10, and the same effect as in the first embodiment can be obtained.

Here, FIG. 8 is a configuration diagram showing the inside of the voice adjustment unit 51 mounted on the voice control unit 5 of the mobile phone. The voice adjustment unit 51 includes N switches 51a-1 to 51a-N and a filter 51b. -1 to 51b-N.
FIG. 9 is an explanatory diagram showing output characteristics of the filters 51b-1 to 51b-N constituting the audio adjusting unit 51.

In the example of FIG. 9, in the low frequency region where the frequency of the analog audio signal is about 400 Hz to 600 Hz, all the filters 51b-1 to 51b-N have the same signal passing characteristics, but the frequency of the analog audio signal In the high-frequency region of about 600 Hz or more, the filter 51b-N has the highest signal passing characteristic, and the filter 51b-1 has the lowest signal passing characteristic. Note that the signal passing characteristic of the filter 51b-N is flat over the entire frequency range, and is a filter for a normal hearing person.
Therefore, the CPU 10 responds to the set value of the received sound volume by performing on / off control of the switches 51a-1 to 51a-N of the sound adjusting unit 51 according to the set value of the received sound volume whose setting has been received by the operation unit 9. A filter is selected and set so that the analog audio signal passes through the filter.

For example, when a user who has a hearing level in his 70s sets a large reception volume of N + 2 or more, the CPU 10 turns on the switches 51a-N of the voice adjustment unit 51 and turns on the other switches 51a-1 to 51a-3, for example. By setting it to OFF, the analog audio signal is set to pass through the filter 51b-N (only the switch 51a-2 or 51a-3 is turned ON, and the analog audio signal passes through the filter 51b-2 or 51b-3. May be set to pass).
On the other hand, when a user having a hearing level of 60's or lower sets a small reception volume of N + 1 or lower, the CPU 10 turns on the switch 51a-1 of the voice adjustment unit 51 and turns off the other switches 51a-2 to 51a-N. Is set so that the analog audio signal passes through the filter 51b-1.

It is a block diagram which shows the mobile telephone by Embodiment 1 of this invention. It is a block diagram which shows the inside of DSP of the mobile telephone by Embodiment 1 of this invention. It is a flowchart which shows the received voice adjustment method by Embodiment 1 of this invention. It is a flowchart which shows the received voice adjustment method by Embodiment 1 of this invention. It is explanatory drawing which shows the general tendency of the hearing level according to a generation. It is explanatory drawing which shows the frequency characteristic of the digital audio | voice signal suitable for the setting value of each receiving volume. It is a block diagram which shows the inside of the audio | voice control part of the mobile telephone by Embodiment 2 of this invention. It is a block diagram which shows the inside of the audio | voice adjustment part mounted in the audio | voice control part of a mobile telephone. It is explanatory drawing which shows the output characteristic of each filter which comprises the audio | voice adjustment part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna 2 Radio | wireless part (Audio signal extraction means) 3 DSP (Audio signal extraction means, Audio signal adjustment means) 4 DA / AD converter (Audio signal reproduction means) 5 Audio control part (Audio signal reproduction means, Audio Signal adjusting means), 6 microphones, 7 receiver (audio signal reproducing means), 8 memory (frequency characteristic storage means), 9 operation section (volume setting means), 10 CPU (audio signal adjusting means), 11 display section, 31 parameters Reflection unit, 32 audio adjustment unit, 51 audio adjustment unit, 51a-1 to 51a-N switch, 51b-1 to 51b-N filter.

Claims (2)

  A frequency characteristic storage means for storing a signal level for each frequency of the sound signal for each set value of the reception sound volume, a sound volume setting means for receiving the reception sound volume setting, and a sound signal is extracted from the radio signal received by the antenna. Read out the signal level for each frequency of the audio signal corresponding to the received sound volume set by the volume setting unit from the audio signal extraction unit and the frequency characteristic storage unit, and match the signal level for each frequency A mobile phone comprising: audio signal adjusting means for adjusting the signal level of the audio signal extracted by the audio signal extracting means; and audio signal reproducing means for reproducing the audio signal whose signal level has been adjusted by the audio signal adjusting means.   The signal level for each frequency of the audio signal is stored in advance for each set value of the reception volume, and the reception volume setting reception process is performed. On the other hand, when the antenna receives a radio signal, the audio signal is extracted from the radio signal The signal level for each frequency of the audio signal corresponding to the received sound volume received from among the signal levels for each frequency of the plurality of audio signals stored in advance, A received voice adjustment method for adjusting a signal level of an extracted voice signal so as to coincide with another signal level.

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