Effect addition apparatus

• US 4,998,281 A
• Filed: 04/03/1990
• Issued: 03/05/1991
• Est. Priority Date: 08/20/1987
• Status: Expired due to Term

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Sakata, Goro
• Primary Examiner(s): Isen, Forester W.
• Application Number:
  US07/504,021
• Time in Patent Office: 336 Days
• Field of Search: 84/622, 84/626, 84/628, 84/629, 84/630, 84/631, 84/659, 84/662, 84/707, 381/61, 381/62, 381/63
• US Class Current: 381/63
• CPC Class Codes: G10H 1/0091 Means for obtaining special acoustic effects combined with modulation G10H1/043
• CPC Class Codes: G10H 2210/281 Reverberation or echo
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones

Abstract

Each time sampling clock CK is input, a controller controls respective circuits, and performs various arithmetic operations of data stored in tone color parameter memories, and time-divisionally performs sound effect addition and changing of tone color parameters.

Claims

1. An effect addition apparatus, comprising:

effect addition means for receiving samples of input signal data for generating effect signal data from the received input signal data, said effect addition means including storing means for storing at least the input signal data and means for delaying the input signal data by controlling a ready address of a storage content stored in said storing means;

first changing means coupled to said effect addition means for changing a volume of said input signal data input to said effect addition means;

second changing means coupled to said effect addition means for changing a volume of the effect signal data output from said effect addition means;

outputting means coupled to said effect addition means for outputting tone color paratmeter data which is supplied to said effect addition means for generating the effect signal data according to the tone color parameter data;

clearing means coupled to said storing means for clearing the storage content of said storing means; and

control means coupled to said effect addition means, to said first changing means, to said second changing means, to said outputting means, and to said clearing means, for controlling, when the tone color parameter data is supplied to said effect addition means from said outputting means, said first changing means and said second changing means to gradually decrease a volume of the input signal data supplied to said effect addition means and a volume of the effect signal data output from said effect addition means, for controlling said clearing means to clear the memory content of said storing means, for controlling said outputting means to supply the tone color paratmeter data tod said effect addition means, and for controlling said first changing means and said second changing means to gradually recover the volumes of the input signal data and the effect signal data outputted from said effect addition means.

2. An apparatus according to claim 1, wherein said effect addition means further comprising adder means for feeding back the storage content of said storing means to obtain feedback data and for adding the feedback data and the input data to obtain an addition data which is supplied to said storing means so that reverberation signal data is generated and outputted.

3. The apparatus of claim 1, wherein:

said effect addition means further comprises adder means for feeding back the storage content odf said storing means to obtain feedback data and for adding the feedback data and the input data to obtain an addition data which is supplied to said storing means so that reverberation signal data is generated and outputted and ;

said outputting means including means for outputtingd data for determining a delay time of said delay means and a volume of the feedback data as the tone color parameter data.

4. The apparatus of claim 1, wherein said control means includes means for executing, in a time division manner, a first control operation for generating an effect signal data from the input signal data and a second control operation for supplying the tone color parameter data to said effect addition means from said outputting means, every time one of samples of the input signal data is supplied to said effect addition means.

5. A control method for changing a content of a tone color parameter data to be supplied to an effect addition means which is provided to receive samples of input signal data for generating and outputting effect signal data according to the input signal data, said effect addition means including storing means for storing at least the input signal data and means for delaying the input signal data by controlling a ready address of the storing means to read out a storage content of the storing means so that effect signal data is generated from the effect addition means in accordance with tone color parameter data, said method comprising:

gradually decreasing the volume of the input signald data inputted to said effect addition means by controlling a first changing means for changing the volume of the input signal data input to said effect addition means and for gradually decreasing the volume of the effect signal data outputted from said effect addition means by controlling a second changing means for changing the volume of the effect signal data outputted from said effect addition means;

clearing the storage content of said storing means;

supplying tone color parameter data to said effect addition means; and

gradually recovering the volume of the input signal data input to said effect addition means and the volume of the effect signal data outputted from said effect addition means by controlling said first changing means and said second changing means.

6. An effect addition apparatus comprising:

effect addition means for receiving samples of input signal data and for generating and outputting effect signal data in accordance with the input signal data;

means coupled to said effect addition means for outputting tone color parameter data which is supplied to said effect addition means for generating the effect signal data in accordance with the tone color parameter data, said outputting means including menas for calculating interpolating data for interpolating between an unchanged tone color parameter and an objective tone color parameter so as to generate gradually changing tone color parameter data, and said outputting means outputting the interpolating data as a net tone color parameterd when the unchanged tone color parameter is changed into the objective tone color parameter; and

control means, coupled to said effect addition means and to said outputting means, for performing, when the unchanged tone color parameter is changed to the objective tone color parameter, the following operations during one sample period of the input signal data in a time division manner;

(a) a first control operation for controlling said outputting means for calculating the interpolating data and for supplying the calculated interpolating data to said effect addition means as a new tone color parameter; and

(b) a second control operation for controlling said effect addition menas to generate and output the effect signal data according to the input signal data based on the supplied new tone color parameter data.

7. An effect addition apparatus comprising:

input signal data storing means for storing samples of input signal data;

`memory means for storing data for generatingd low-frequency waveform data; and

ds

control means, coupled to said input signal data storing means and to said memory means, for performing the following operations during one sample period of the input signal data in a time division manner;

(a) a first control operation for controlling said input signal data storing means to store one sample of the input signal data;

(b) a second control operation for calculating low-frequency waveform data according to the data stored in said memory means; and

(c) a third control operation for determining a read address of said input signal data storing means based on the low-frequency waveform data to read out delayed input signal data from said input signal storing menas so as to generate effect signal data.

8. The apparatus of claim 7, wherein said memory means include menas for storing angle data, time data nd change amount data, the angle data representing a period of time between two points on a low-frequency waveform which is divided with a predetermined amplitude difference between the points, the change amount data representing whether an inclination of the waveform is positive or negative, and the time data representing the number of times at which the change amount data and the angle data represent the same value, repeatedly.

9. The apparatus of claim 7, wherein said control means perform the following operations during one sample period of the input signal data in a time division manner;

d

(a) a first control operation for controlling said input signal data storing means to strore therein the one sample of the input signal data;

(b) a second control operation for calculating two low-frequency waveform data of different phases in accordance with the data stored in said memory means; and

(c) a third control operation for determining a readd address of said input signal data storing means based on the two low-frequency waveform data to read out therefrom delayed two input signal data so as to generate two effect signal data.

10. An effect addition apparatus comprising:

d

input signal data storing menas for storing samples of input signal data;

d

memory means for storing data used to generate low-frequency waveform data; and

control means, coupled to said input signal data storing means and to said memory means, for performing the following operations during one sample period of the input signal data in a time division manner;

d

(a) a first control operation for controlling said input signal data storing mens to store one sample on the input signal data;

(b) a second control operation for calculating low-frequency waveform data in accordance with the data stored in said memory means; and

d

(c) a third control operation for multiplying the low-frequency waveform data by samples of input signal data to generate effect signal data.

11. The apparatus of claim 10, wherein said control means perform the following operations during one sample period of the input signal data in a time division manner;

(a) a first control operation for controlling said input signal data storing means to store therein one sample of the input signal data;

(b) a second control operation for calculating two low-frequency waveform data of different phases from each other based on the data stored in said memory means; and

d

(c) a third control operation for multiplying the two low-frequency waveform data by the samples of input signal datad