Radio receiver for receiving digital radio signals and method for receiving digital radio signals

• US 20040058662A1
• Filed: 10/01/2003
• Published: 03/25/2004
• Est. Priority Date: 05/17/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Gieske, Kurt, Nitsche, Gunnar
• Granted Patent: US 7,702,039 B2
• Time in Patent Office: Days
• US Class Current: 455/313
• CPC Class Codes: H04J 3/0632 Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES] queuing arrangements in packet switching elements H04L49/90; synchronising systems for the synchronous transmission of a pulse code modulated video signal with one or more other pulse code modulated signals H04N7/56
• CPC Class Codes: H04L 7/0029 interpolation of received data signal
• CPC Class Codes: H04L 7/005 Correction by an elastic buffer

Abstract

A radio receiver for receiving digital radio signals and a method for receiving digital radio signals are proposed, which are used for undertaking the conversion of digital audio signals to a preset clock pulse rate or clock pulse regulation. The digital asynchronous sampling rate conversion has an input buffer, a control system, a coefficient memory, an accumulator and an interpolator. The output signals of the sampling rate conversion are either passed on for playback or switched to a multimedia bus. The radio receiver according to the present invention and the method according to the present invention are suitable for also converting digital audio signals from sound carriers to a preset clock pulse rate.

Claims

1. A radio receiver for receiving digital radio signals, the radio receiver having a demodulator (3) for demodulating the digital radio signals and for ascertaining digital audio signals,

wherein the radio receiver has a fixed-frequency oscillator (12) and a digital asynchronous sampling rate converter (13), the digital asynchronous sampling rate converter (13) compensating for the clock pulse deviation between the transmitted digital audio signals and the fixed-frequency oscillator (12) before the digital audio signals are reproduced.

3. The radio receiver as recited in claim 1 or 2,

wherein the digital asynchronous sampling rate converter (13) has an input buffer (6), a control system (7), a coefficient memory (8) and an accumulator (9) as well as an interpolator (10).

4. The radio receiver as recited in claim 1 or 2,

wherein an input of the digital asynchronous sampling rate converter (13) is connected to an output of at least one device for the playback of sound carriers.

2. A radio receiver for receiving digital radio signals, the radio receiver having a demodulator (3) for demodulating the digital radio signals and for ascertaining digital audio signals,

wherein the radio receiver has a fixed-frequency oscillator (12) and a digital asynchronous sampling rate converter (13), and is connected to a multimedia bus, the digital asynchronous sampling rate converter (13) converting the received digital audio signals directly to the clock pulse rate preset by the multimedia bus, before the digital audio signals are fed to the multimedia bus.

5. A method for receiving digital radio signals, the radio signals being demodulated;

digital audio signals being ascertained from the demodulated radio signals;

the digital audio signals being decoded, amplified and reproduced acoustically,

wherein the clock pulse deviation between the received digital audio signals and the frequency of a fixed-frequency oscillator (12) is equalized to the received digital audio signals by a digital asynchronous sampling rate conversion, before the digital audio signals are amplified and reproduced acoustically.

7. The method as recited in claim 5 or 6,

wherein the clock pulse deviation is corrected to a preset clock pulse by a clock pulse regulation.

8. The method as recited in claim 5,

wherein the clock pulse deviation is ascertained from the TFPR symbol.

9. The method as recited in claim 5 or 6,

wherein in the digital asynchronous sampling rate conversion the digital audio signals are buffered;

and

output values of the digital asynchronous sampling rate conversion are calculated, using filter coefficients and the digital audio signals.

10. The method as recited in claim 5 or 6,

wherein the number of the buffered digital audio signals is regulated to a setpoint value.

11. The method as recited in claim 5 or 6,

wherein the output values are calculated using interpolation and nodes.

12. The method as recited in one of claims 5 through 11,

wherein the filter coefficients are optimized in that the average quadratic error between an interpolated continuous signal and a corresponding ideal output signal is minimized for a preset frequency range.

6. A method for receiving digital radio signals, the radio signals being demodulated;

digital audio signals being ascertained from the demodulated radio signals;

the digital audio signals being decoded, amplified and reproduced acoustically,

wherein the received digital audio signals are converted are to a clock pulse rate of a multimedia bus using a digital asynchronous sampling rate conversion, before the digital audio signals are fed to the multimedia bus.